Showing papers in "Brazilian dental science in 2016"
TL;DR: This study has aimed to investigate the available stress analysis methods to study dental implants’ behavior through a literature review and found that FEA, SGA, PEA and DIC methodologies are capable to elucidate the mechanical behavior of this rehabilitation system.
Abstract: Since 1980, the biomechanical behavior of dental implants has received importance regarding the issue of failure in this rehabilitation system due to occlusal overload. Through bioengineering tools, several studies have been conducted to answer about the influence of different factors on the biological response. Bioengineering tools such as finite element analysis (FEA), strain gauge (SGA), photoelasticity (PEA) and digital image correlation (DIC) are widely inspiring clinical extrapolation of possible solutions in the mechanics of implantology. This study has aimed to investigate the available stress analysis methods to study dental implants’ behavior through a literature review. This review started with a PubMed search from the mostly old studies of each methodology correlated to biomechanical behavior of dental implants used with dental implants studies until 2016. FEA, SGA, PEA and DIC methodologies are capable to elucidate the mechanical behavior of this rehabilitation system. However, the combination of two or more methods gives more detailed explanation and avoids limitations of a single methodology.
26 citations
TL;DR: A therapeutic option for functional and esthetic rehabilitation of a devitalized mandibular molar, presenting a small amount of remaining coronal tooth structure, by means of cementing a pure porcelain crown of the Endocrown type (Adhesive Endodontic Crown).
Abstract: The purpose of this clinical case description article was to present the planning sequence, indication, treatment and performance to obtain a crown of the Endocrown type. This clinical case description article illustrates a therapeutic option for functional and esthetic rehabilitation of a devitalized mandibular molar, presenting a small amount of remaining coronal tooth structure, by means of cementing a pure porcelain crown of the Endocrown type (Adhesive Endodontic Crown). A 39-year-old woman presented to the Graduate clinic of the Bauru Dental School (FOB), University of Sao Paulo (USP), with the complaint that tooth #36 had an extensive and unsatisfactory composite resin restoration. The lithium disilicate-based system of monolithic porcelain was used with the lost wax technique. This therapy promoted the stability and retention of the indirect restoration, without the need for performing reconstruction of the above mentioned tooth, either by means of a cast metal core or reconstruction with intracanal post, thereby reducing the treatment time. After the tooth preparation, the provisional restoration was done with acrylic resin to determine if the retention and stability of the remaining tooth was adequate to receive the indirect Endocrown restoration. The characteristics of the internal and external walls of the dental remnants, cervical termination, impression-taking, laboratory stages and adhesive cementation will be discussed. The major advantage of indicating an endocrown is the use of the dental remnants itself, particularly the pulp chamber, to promote retention and stability in cases without adequate height for performing complete dental and crown reconstruction. Keywords Adhesive endodontic crown; Devitalized tooth; Lithium dissilicate.
11 citations
TL;DR: The thickness influenced fluorescence of enamel and all resin composites and tooth substrates assessed showed fluorescence lower than natural dentin.
Abstract: Objective: This study evaluated the effect of thickness on fluorescence of resin composites and tooth substrates (enamel and dentin). Material and methods: Ninety bovine incisors were used, resulting in 45 dentin and 45 enamel disks (6 mm diameter and 0.5, 1 , or 1.5 mm in thickness). Ninety discs of Charisma, Filtek Z350 and IPS Empress Direct (for enamel and dentin) resins at same dimensions were built . Fluorescence measurements were performed using a fluorescence spectrophotometer (RF-5301PC, Shimadzu Corp) with excitation at 365 nm. Data were submitted to 2-way ANOVA and Tukey’s post hoc tests (α = 0.05). Results : The 2 - way - ANOVA revealed statistically significant differences for all factors, as well as the interaction between them (p <0.05). Dentin specimens (1.5 mm) showed highest fluorescence (128.33 A.U.), while Filtek Z350 (dentin - 1.0 mm) showed the lowest fluorescence (29.84 A.U.). Thickness influenced fluorescence values of enamel substrate. Conclusion: The thickness influenced fluorescence of enamel and all resin composite assessed showed fluorescence lower than natural dentin. Keywords Dental enamel; Dental resins; Dentin; Spectrometry, Fluorescence.
10 citations
TL;DR: It is demonstrated that salivary and Serum alpha- amylase were significantly higher in caries active group as compared to carries free group and more research should be done to demonstrate real relation between alpha-amylase and dental caries.
Abstract: Objective : Some previous studies suggested a significant relationship between alpha- amylase, and caries formation This study was implemented in order to investigate the interrelation between level of salivary and serum alpha- amylase and dental caries Material and Methods : In this cross-sectional investigation, un-stimulated whole saliva and serum sample was collected from 118 high school students who were divided to four groups: Caries free female (N= 28), caries active females (N=35), caries free males(N= 28) and caries active males(N= 27) Mean levels of salivary and serum alpha-amylase was assayed by spectrophotometric method to assay enzyme kinetics Data were analyzed using student’s t-test and chi-square test Results : The results of this study demonstrated that salivary and Serum alpha- amylase were significantly higher in caries active group as compared to carries free group(P = 0002, P= 0001 respectively) In addition in male groups the mean salivary and serum alpha -amylase was significantly higher in caries active as compared to caries free (P = 0002, P = 002 respectively) and in female Groups the mean serum alpha- amylase was statistically significant higher in caries active as compared to caries free (P = 001) Conclusion : The results of this study demonstrated significant association between salivary and serum alpha- amylase in adolescence with dental caries More research should be done to demonstrate real relation between alpha amylase and dental caries Keywords Alpha–amylase; Dental caries; Saliva; Serum
9 citations
TL;DR: Recognition of the specialty seems to have resulted in a significant increase in gerodontology-related research; however, this growth coincides with an overall increase in research in Brazil and is less extensive than for other specialties, which were recognized at the same time.
Abstract: Fifteen years ago, as a response to its rapidly aging population, Brazil was the first country to recognize gerodontology as a dental specialty. The aim of this paper is to evaluate the outcomes of this change by examining the increase in number of advanced gerodontology-trained dentists and identifying the volume of gerodontology-related research that has been published. The Brazilian Dental Board web site was searched in order to verify the number of specialists in gerodontology and their geographic distribution. In order to provide a quantitative assessment of the number of gerodontology-related graduate programs generated since the specialty was recognized, three sites were searched: a) the government database for post-graduate theses, which compiles all theses and dissertations completed as part of the requirements of accredited post-graduate courses in Brazil; b) the Brazilian Dental Library (Biblioteca Brasileira de Odontologia, BBO), which compiles papers published in Portuguese; and c) the PubMed database. Recognizing gerodontology as a dental specialty in Brazil required advanced training programs to be developed in geriatrics and gerodontology. The current number of specialists in gerodontology (276) is still lower than the needs of the Brazilian dental workforce.. Recognition of the specialty seems to have resulted in a significant increase in gerodontology-related research; however, this growth coincides with an overall increase in research in Brazil and is less extensive than for other specialties, which were recognized at the same time. More still needs to be done to add gerodontology to dental school curricula, even though a significant number of schools do teach the discipline.
8 citations
TL;DR: Universal adhesive system performed similarly to the total-etch adhesive and was not affected by the adhesion strategy.
Abstract: Objective : This study evaluated the microtensile bond strength of a universal adhesive system applied to deep dentin under different bonding strategies. Material and Methods : Fifteen human third molars had the coronal portion removed exposing deep dentin and were assigned into 3 groups according to the adhesive system: G1(control): 2-steps totaletch (Adper Single Bond 2, 3M ESPE); G2: 1-step self-etch universal adhesive (Scotchbond Universal, 3M ESPE); G3:2 steps total-etch universal adhesive (Scotchbond Universal, 3M ESPE). Composite buildups were performed on the dentin surfaces and after water storage for 24 h, teeth were sectioned to obtain 40 bonded beams per group with sectional area of 0.9 mm2 . The specimens were submitted to the microtensile bond strength (µTBS) test until failure. Statistical analyses were computed using one-way ANOVA (p = 0.05). Results : The mean µTBS (in MPa) were G1 = 22.27, G2 = 22.85 and G3 = 20.3. After statistical analysis, no significant differences were observed among the groups. Conclusions : Universal adhesive system performed similarly to the total-etch adhesive and was not affected by the adhesion strategy. KEYWORDS Microtensile; Adhesive system; Dentin.
6 citations
TL;DR: The greatest demand was for curative and not preventive procedures and that the prevalence of caries is high in this group of patients, including individuals with mental retardation and Down´s syndrome.
Abstract: Objective : The aim of this paper was to outline the profile of patients with special needs who sought treatment at School of Dentistry, Universidade Federal Fluminense (FO-UFF). Material and Methods: We evaluated the charts of 17 patients who sought care during the survey period. The variables were gender, age, reason for consultation, continuous use of psychotropic drugs, socioeconomic status, consumption of sugar, toothbrushing frequency, dental occlusion dental care and length of treatment. All patients were treated by two undergraduate students linked to the project under supervision. Results: The mean age of the patients was 9.65 years old and males were the most prevalent (52.94%). Individuals with mental retardation and Down´s syndrome were the predominant group seeking dental care (35,3%) and pain was cited as the main reason (58,82%). The average dmft 0.9 (±1,4) and DMFT was 3.29 (±7,07) among patients and restorative treatment was provided for 25% of the patients. Conclusions: In conclusion the greatest demand was for curative and not preventive procedures and that the prevalence of caries is high in this group of patients. Keywords: Dental caries; DMFT index; Intellectual disability.
6 citations
TL;DR: One min delay prior to light curing improved the cure efficiency and may be a more clinically acceptable approach to increase the degree of conversion of dual-cure resin cements.
Abstract: Objective: To evaluate the effect of shade and curing mode on cure efficiency of two dual-cure resin cements. Material and Methods: Two shades (A2 and TRANS) of two different dual-cure resin cements (G-CEM, GC Dental and SET PP, SDI) were submitted to different curing modes: light curing through a 2 mm thick ceramic disc (IPS Empress Esthetic, A2, Ivoclar Vivadent) for 20 s (16 J/cm 2 ), 40 s (32 J/cm 2 ) or 80 s (64 J/cm 2 ) performed immediately or with 1 or 5 min of delay. Fourier transform infrared spectroscopy (FT-IR) was used to evaluate the degree of conversion (DC) after 48 h. For the statistical analysis, data were submitted to three-way analysis of variance, followed by Tukey’s test for multiple comparisons (p=0.05). Results: Shade influenced DC (%) for the dual-cure resin cements tested (p=0.00001). TRANS shade showed lower DC (%) for both cements when there was no delay before light-curing (p=0.00001). Curing mode also influenced DC (%) for the dual-cure resin cements tested: radiant exposure greater than 32 J/cm 2 and delaying light-curing for 1 to 5 min increased the DC (%) for both dual-cure resin cements evaluated. Conclusions: One min delay prior to light curing improved the cure efficiency and may be a more clinically acceptable approach to increase the degree of conversion of dual-cure resin cements.
5 citations
TL;DR: The interocclusal splint provides temporary changes in condylar position, with a tendency to increase the joint space, varying in accordance with individual characteristics, which has proved to be reversible and conservative therapeutic modality, as it does not generate permanent changes in joint tissues.
Abstract: The aim of this study was to evaluate the condylar position in patients with intra-articular temporomandibular disorders (TMD) before and after treatment with interocclusal stabilization splint (ISS) through computerized tomography cone beams (CTCB). Twenty-two patients diagnosed with intra-articular TMD (Research Diagnostic Criteria for Temporomandibular Disorders - Group II) were submitted to the therapy with ISS during 90 days. Three CTCB exams were performed in three moments: T1 – Initial moment, before the ISS therapy, with the patient in dental occlusion; T2 (after 90 days of treatment, in occlusion on the ISS) and T3 (after 90 days of treatment, with the patient in dental occlusion). Afterwards the anterior (AS), superior (SS) and posterior articular space (PS) in sagittal sections were then measured and the data were statistically analyzed using the t-test. There was a statistically significant increase in the comparison between T1 and T2 for the AS and PS (p< 0.0001), between T3 and T2 for AS (p= 0.0008) and PS (p< 0.0001). In comparison T1/T3 there was a significant increase in AS (p= 0.01) and SS (p= 0.04), and non-significant in PS (p= 0.89). The interocclusal splint provides temporary changes in condylar position, with a tendency to increase the joint space, varying in accordance with individual characteristics. Therefore, it should not be used as a single therapy, but combined with other strategies that include the TMD multidimensionality. The interocclusal splint has proved to be reversible and conservative therapeutic modality, as it does not generate permanent changes in joint tissues.
4 citations
TL;DR: Self-perceived dental aesthetics has a strong influence on the psychological as well as the social wellbeing of individuals, therefore self-perception of dental aesthetics maybe an important key in deciding the orthodontic treatment need.
Abstract: Objective : Dental aesthetics essential part of facial attractiveness, plays a vital role in the social as well as the psychological well being of individuals. This study aimed to assess the level of dental aesthetics by the self-rated Aesthetic Component (AC) of the Index of Orthodontic Treatment Need (IOTN) and the psychosocial impact of dental aesthetics using the ‘Psychosocial Impact of Dental Aesthetics Questionnaire’ (PIDAQ). Material Methods: A total of 192 high school students (13-16 years old), genders equally participated in the study and completed a modified version of the ‘Psychosocial Impact of Dental Aesthetics Questionnaire’ (PIDAQ). Dental aesthetics were assessed by the IOTN Aesthetic Component (self-rated IOTN-AC). The data was processed and analyzed using computer software program “SPSS” (Statistical Package for Social Sciences) version 17. T-test has been used, P -value of less than 0.05 was considered as significance. Results: All the variables of the PIDAQ showed a significant difference with the groups of the IOTN-AC ( P -value < 0.05). Inter-gender significant difference was found among the students. Conclusion: Self-perceived dental aesthetics has a strong influence on the psychological as well as the social wellbeing of individuals. Therefore self-perception of dental aesthetics maybe an important key in deciding the orthodontic treatment need. Keywords: Dental aesthetics; Psychosocial impact; Malocclusion; IOTN; Students.
4 citations
TL;DR: Thumb length is a better predictor for measuring hand grip strength and work related musculoskeletal disorder, than unilateral hand finger dexterity.
Abstract: Objective: The key factor for potency of the teeth is their muscular strength. The dominant hand plays an important role in most of the daily muscular activities involving dental procedure. There are many factors, which may affect the grip strength, and very few studies especially in India have shown their correlation with grip strength. Work related musculoskeletal disorders (WRMSD) are an important occupational health problem affecting dental practitioners. This study assessed the prevalence of WRMSD in dental interns in relation to the thumb length and hand grip strength. Material and Methods : Thumb length template, jammer dynamometer, nine-hole peg board, and RULA assessment. Methods: Thumb length was measured by thumb length template. Grip strength was measured by jammer dynamometer, unilateral hand finger dexterity was measured by nine-hole pegboard, and work related musculoskeletal disorder was assessed by RULA. Results : Thumb length was positively correlated with grip strength and work related musculoskeletal disorder. Thumb length was negatively correlated with unilateral hand finger dexterity among dental professionals. Conclusion : Thumb length is a better predictor for measuring hand grip strength and work related musculoskeletal disorder, than unilateral hand finger dexterity. Keywords Dental professional; Hand grip strength; Thumb length; Unilateral hand finger dexterity; Work related musculoskeletal disorder.
TL;DR: A significant number of patents applied and approved in Brazil on xerostomia are found, many of them using acids derived from natural products such as sialologue agents, demonstrating the relevance of the theme and the need for more studies involving the potential use of natural products to relieve symptoms.
Abstract: Xerostomia is characterized as a symptom caused by hyposalivation, which can occur for reasons such as age, polypharmacy, radiation therapy, among others. Currently,few products are available for the treatment of xerostomia, which is a subject still underestimated by many health professionals. Thus, we searched patents applied and approved in Brazil on xerostomia, to verify the existing innovation involving natural products. We found 33 patents applied and approved in Brazil, many of them using acids derived from natural products such as sialologue agents. This significant number of patents demonstrates the relevance of the themeand the need for more studies involving the potential use of natural products to relieve symptoms. Keywords Xerostomia; Natural products and patents.
TL;DR: It can be concluded that there was a considerable prevalence of TMD in patients with double dentures, but there was no correlation between the use of full and DTM prosthesis.
Abstract: O bjective : E valuate the prevalence of Temporomandibular Disorder in patients with full double prosthesis. Material and Methods : The sample was composed of 40 volunteer patients, aged between 34 and 92 years, with upper and lower dentures, assisted at the Total Prosthodontics Clinic of the School of Dentistry at the Federal University of Juiz de Fora. Patients were evaluated by a single trained examiner and the diagnosis of TMD was established from the axis I of the RDC/TMD. Results : The prevalence of TMD in the sample was 42.5%, and most patients were female. Although there was no statistical significance between the time of use of the prosthesis and the presence of TMD was found, there was a correlation between time without use of prosthesis and the presence of disc displacement. Conclusion : According to the methodology applied and the results of this study, it can be concluded that there was a considerable prevalence of TMD in patients with double dentures, but there was no correlation between the use of full and DTM prosthesis. Keywords : Facial Pain; Temporomandibular Joint Dysfunction Syndrome; Complete Denture.
TL;DR: It is shown that a higher volume of composite resins determines an increase in the shrinkage stress of light-curing composites, using a non-rigid method that thereby provides lower stress values, causing a minimal deflection in load cell.
Abstract: Objective: Composite polymerization shrinkage stress is an inherent process of chemical and light composite resin activation. Consequently, this fact has been associated to potential clinical problems. The aim of the present in vitro study was to evaluate the volume and C-factor influence on chemical and lightcuring composite resin polymerization shrinkage stress, using a non-rigid method that thereby provides lower stress values, causing a minimal deflection in load cell. Materials and Methods: The contraction forces of the Z-250 and Concise composite resins during polymerization were recorded in an UTM in two experiments. In the first experiment, the Z-250 composite was inserted beetwen two rectangular steel plates (6.0 x 2.0 mm), varyng the resin volumes and C-factors, in a single increment, polymerized for 20 s and the forces generated were recorded for 120 s. In the second experiment, a pair of rectangular steel plates (3x2mm) and two square steel plates (2x2mm), with varied heights (2; 3 mm, respectively), were used to determine the C-factor (0.6; 0.3) influence. Results: The polymerized Z-250 results showed that the volume variations, independent of the C-factor, had a direct influence on the shrinkage stress, different from the Concise, which was influenced by the C-factor. Conclusion: The present study showed that a higher volume of composite resins determines an increase in the shrinkage stress of light-curing composites. Keywords C-factor. Composite resin. Polymerization. Shrinkage stress.
TL;DR: In vitro analysis of the stress related to instrumentation of artificial root canals with Reciproc System by using the photoelasticity method found the greatest stress occurred in the middle and apical thirds during the first instrumentation.
Abstract: Objective: The aim of this pilot study was to perform in vitro analysis of the stress related to instrumentation of artificial root canals with Reciproc System by using the photoelasticity method. Material and Methods: Photoelastic models consisted of two epoxy resin blocks simulating root canals, which were attached with cyanoacrylate adhesive to a base and placed at the centre of a circular polariscope in a dark-field configuration. The Reciproc R25 instrument was mounted to a VDW motor and used in block 1 up to 12 mm (working length) and then the same instrument was used in block 2. The images were captured by video camera and analysed at the time of the fourth penetration. Isochromatic fringes were observed in the cervical, middle and apical thirds at mesial and distal regions of each block. Therefore, they were divided into cervical-mesial (CM), cervical-distal (CD), middle-mesial (MM), middle-distal (MD), apical-mesial (AM) and apical-distal (AD). Results: In the first instrumentation, it was found that the greatest stress occurred at the middle-distal region (1.38), followed by middle-mesial (1.20), apical-distal (1.20) and apical-mesial regions (1.20). In the second instrumentation, the greatest stress occurred at the middle-mesial (1.20), apical-distal (1.20), apical-mesial (1.20) and middle-distal regions (0.90). Conclusion: The greatest stress occurred in the middle and apical thirds during the first instrumentation. Re-utilization caused less stress. Keywords Dental Stress Analysis; Endodontic; Instrumentation.
TL;DR: This case discusses a multi-disciplinary approach to oral functional and esthetic rehabilitation on a high-caries-risk child with prematurely lost primary teeth due to endodontic complications associated with wide-spread dental caries.
Abstract: This case discusses a multi-disciplinary approach to oral functional and esthetic rehabilitation on a high-caries-risk child with prematurely lost primary teeth due to endodontic complications associated with wide-spread dental caries. The patient was diagnosed with an anterior open bite and atypical swallowing. He exhibited anxiety and low self-esteem due to esthetic impairment. A combination of targeted clinical procedures, a focus on oral home care and active parental involvement was integral to the treatment process. The patient was examined monthly by a pediatric dentist regarding dietary habits, fluoride exposure, biofilm presence, caries prevalence, and malocclusion. Improvement was evident in patient’s masticatory function, facial esthetics, and psychological behavior at a 12-month follow-up evaluation. Keywords Deciduous; Dental Caries; Mouth Rehabilitation; Tooth.
TL;DR: In this paper, the authors analyzed chronic alcohol consumption influence on induced periodontitis in rats presenting estrogen deficiency, and concluded that the association between estrogen deficiency and 20% ethanol was just relevant for sites without periodontal disease induction, since it induces stronger severity in the inflammatory process in the presence of the inflammatory cells scattered in the conjunctive tissue and of the disorientation of periodont ligament fibers.
Abstract: The immune system plays an important role in the pathogenesis of periodontal diseases. The host may modulate periodontal inflammatory reactions and it determines variances in the individual susceptibility and in the periodontal disease progression speed. Osteoporosis and alcoholism are described as risk indicators of periodontal disease among the systemic acquired factors. Objective: The current study aims to analyze chronic alcohol consumption influence on induced periodontitis in rats presenting estrogen deficiency. Material and Methods: Sixty rats approximately 90 days old were used in the experiment; they were divided into two groups: correlated surgery (OVZ) or surgical ovariectomy simulation (SHAM). Each group was divided into three subgroups: (C) control diet, (A) ethanol containing 20% liquid diet and (I) par-fed control diet. Thirty days after castration the diet and the experimental periodontitis induction were kept for 56 days. Interproximal regions between the first and the second lower left molar and the respective contralateral site without periodontal disease induction were assessed for inflammatory features. Results: Hormone deficiency resulted in important inflammatory changes concerning the meaning of SHAM-C and OVZ-C. The ethanol diet has resulted in inflammatory changes to both groups SHAM-A and OVZ-A in the absence of periodontitis, with also greater severity when combined with ovariectomy. Conclusion: It was concluded that the association between estrogen deficiency and 20% ethanol was just relevant for sites without periodontitis disease induction, since it induces stronger severity in the inflammatory process in the presence of the inflammatory cells scattered in the conjunctive tissue and of the disorientation of periodontal ligament fibers. Keywords Alcoholism; Osteoporosis; Ovariectomy; Periodontal disease.
TL;DR: No addition effect was observed when CHX and F were used in combination, when compared with CHX used alone, and when compared to control group and the F treatments alone.
Abstract: Objective. This in vitro study investigated the effect of Fluoride (F), Chlorhexidine (CHX), and their association on the viability of Streptococcus mutans using a biofilm model. Materials and Methods. Biofilms were anaerobically grown on glass slides that were vertically suspended in 24-well plates for 5 days. After 48 h of initial growth, biofilms were treated for the next 72 h, 2x/day with CHX at 0.12% and 2%, F as NaF at 0.08% and 0.4% and their association. Results. CHX treatment decreased the bacteria counts either alone or in association with both F concentrations, when compared with control group and the F treatments alone (p<0.05). Conclusion. No addition effect was observed when CHX and F were used in combination, when compared with CHX used alone.
TL;DR: Whitening dentifrices may have an impact on the longevity of dental composites by an increase in its roughness, and it is strongly recommended that clinicians guide their patients, warning them about the risks and consequences of their use.
Abstract: Objective : the aim of this study was to assess the effects of whitening dentifrices on the surface roughness of three commercial nanofiller-based composite. Material and Methods : two optical analyses were performed: stereomicroscopy and atomic force microscopy (AFM). Disks (8.0 diam. x 2.0 mm thick.) of the nanocomposite Z350 (3M ESPE) and two nano-hybrid composites (EsthetXHD, Dentsply and Premisa, Kerr) were submitted to in vitro brushing (1000 cycles) with three whitening dentifrices (Colgate Luminous White, Oral-B 3D White e Close-Up Diamond Attraction) and a control (Colgate Total12). The results were analyzed by stereomicroscopy and rated according to the following criteria: 0 – no observed roughness, 1 – average roughness, 2 – great roughness. Data was submitted to Kruskall-Wallis non-parametric test followed by Tukey test (p = 0.05). Z350 specimens were assessed by AFM. Results : the surface roughness of composites brushed with whitening dentifrices was statistically higher than the roughness found in specimens brushed with conventional dentifrice. AFM analyses showed that, at a submicrometric scale, there was an increase in the number of peaks and irregularities in specimens brushed with whitening dentifrices. Conclusion : Whitening dentifrices may have an impact on the longevity of dental composites by an increase in its roughness. It is strongly recommended that clinicians guide their patients, warning them about the risks and consequences of their use. Keywords Abrasion; Dentifrices; Composites resin; Roughness; Whitening; Abrasive.
TL;DR: A dor foi avaliada pela Escala Visual Analogica, a amplitude, dor e ruido durante os movimentos mandibulares, alem da dor a palpacao de musculos intra e extra orais e cervicais foram aferidos pelo Indice Craniomandibular.
Abstract: Objetivo: verificar a presenca de sinais e sintomas de DTM em individuos em tratamento ortodontico. Material e Metodos: foram avaliados 28 individuos que estavam em tratamento ortodontico na clinica de uma faculdade do estado de Sao Paulo. Para identificar a presenca de DTM foi utilizado o Research Diagnostic Criteria for Temporomandibular Disorders (RDC-TMD). A dor foi avaliada pela Escala Visual Analogica (EVA). A amplitude, dor e ruido durante os movimentos mandibulares, alem da dor a palpacao de musculos intra e extra orais e cervicais foram aferidos pelo Indice Craniomandibular (ICM). O limiar de dor a pressao foi avaliado por meio de algometro. Os valores medios e desvio padrao foram obtidos e a analise foi expressa em porcentagem. Resultados: o RDC-TMD demonstrou que a maioria dos individuos nao apresentaram DTM, que 3,57% apresentaram osteoartrite, 10,71% artralgia, 3,57% deslocamento de disco sem reducao, 7% dor miofascial e 14,28% dor miofascial com limitacao de abertura; A EVA evidenciou dor media de 1,37 cm (DP=1,4). A media do ICM foi de 0,26 (DP=0,14). O limiar de dor a pressao aferido com algometro foi de 3,7 (DP=1,7) para o m. temporal anterior e de 3,00 (DP=1,2) para o feixe superficial do m. masseter inferior. Conclusao : foram observados sinais e sintomas de DTM em 39,13% dos individuos em tratamento ortodontico.
TL;DR: It is recommended that the self-perception of the individuals is considered simultaneously to the clinical condition to tailor oral health actions targeted to priority groups.
Abstract: This study aimed to investigate the prevalence of oral health impact on the daily performance of Brazilian elderly, living in the city ofCuritiba – PR. The oral health-related quality of life (OHRQoL) of 129 elderly people aged from 60 to 80 years was assessed. Also, the influence of gender, income, attendance to the dentist, self-assessment of health, and social-demographic features were verified. Oral health influenced in 83.72%the daily routine of the participants. The lack of compliance to dental treatment and the difficulty in oral health self-perception as integrate part of general health were associated to the greatest interference.Thus, we recommended that the self-perception of the individuals is considered simultaneously to the clinical condition to tailor oral health actions targeted to priority groups. Keywords: Oral health; Elderly; Quality of life.
TL;DR: It was concluded that the Edenta and Shofu abrasive tips are more effective in reducing the surface roughness of ceromers compared with the Enhance silicone tip.
Abstract: Objective: This in vitro study evaluated the effects of three polishing systems on the surface roughness of two ceromers Material and Methods: 96 specimens (8 mm in diameter and 2 mm thick) were prepared in a metal mold using two restorative materials: CERAMAGE (Shofu, Japan) and VMLC VITA (VITA Zahnfabrik, Germany) The specimens were divided into 4 groups (n=12): G1: positive control, Mylar strip; G2: abrasive tips, Edenta system; G3: silicon tips, Enhance system; and G4: abrasive tips, Shofu system The parameter evaluated was the average surface roughness (Ra) determined by using a profilometer SJ 301 (Mitutoyo, Japan), followed by photographic evaluation images through Scanning Electron Microscopy (SEM), with a 1000x magnification range The data was subjected to statistical analysis for comparison between the groups (ANOVA, Tukey and Student T-tests), with a significance level of 5% Results: there was a statistically significant difference between the silicone tip Enhance and the other groups for both ceromers with higher values of surface roughness There was no statistically significant difference between the ceromers, except for the Shofu system, which showed lower values of surface roughness for Vita VMLC Conclusion: Within the limitations of this study, it was concluded that the Edenta and Shofu abrasive tips are more effective in reducing the surface roughness of ceromers compared with the Enhance silicone tip Keywords: Resins; Surface roughness; Dental polishing
TL;DR: Bond strength decreased when dentin irradiated with the Nd:YAG laser through unpolymerized adhesives was stored in water for 12 months, and SEM showed evident areas of micromorphological alterations on lased samples after 12 months water storage with accelerated degradation of the hybrid layer.
Abstract: Objective : This study evaluated the durability of bond strength to dentin using total-etch (Single Bond /SB) and self-etch (Clearfil SE Bond/CSEB) adhesives associated with Nd:YAG Laser irradiation through the unpolymerized adhesives. Also, this study evaluated micromorfological chances in hybryd layer after 12 months wter storage. Material and Methods : Bovine incisors were worn to expose a dentin area and were divided into 4 groups (n = 15): Group 1 (Control) – SB + photopolymerization; Group 2 (Control) – CSEB + photopolymerization; Group 3 (Experimental/Laser) - SB + Nd:YAG laser (149.28 J/cm 2 ) + photopolymerization; Group 4 (Experimental/Laser) – CSEB + Nd:YAG (149.28 J/cm 2 ) + photopolymerization. Composite blocks were fabricated; intact teeth were stored for 24 h or 12 months (12 m), sectioned into beams and submitted to microtensile bond strength tests. Two teeth from each group (n = 2) were prepared for SEM analysis. Results: Results were analyzed by three-way ANOVA (adhesive, Technique and storage time) and Tukey tests (0.05). Results: For interaction Adhesive X Technique X Storage time the mean values (MPa) were: SB/Control/24h = 34.05(±6.14)a; CSEB /Control/24h = 32.12(±5.26)a; SB/Laser/24h = 30.54(±5.94)a; CSEB/Laser/24h = 29.45(±5.11)a; SB/Control/12m = 29.36(±5.57)a; CSEB/Control/12m = 29.09(±8.84)a; SB/Laser/12m = 22.06(±3.77)b; CSEB/Laser/12m = 13.35(± 3.35)c. Conclusion : SEM showed evident areas of micromorphological alterations on lased samples after 12 months water storage with accelerated degradation of the hybrid layer . Bond strength decreased when dentin irradiated with the Nd:YAG laser through unpolymerized adhesives was stored in water for 12 months. Laser irradiation of dentin through unpolymerized self-etch adhesive significantly reduced bond strength when compare with total-etch adhesive after 12 months water storage. Keywords: Dental adhesives; Dentin bonding ; Nd yag; Tensile strength.
TL;DR: The high score malignancy grade of the tongue carcinomas associated with the expression pattern of the studied matrix proteins suggests that tongue squamous cell carcinomas have more invasive potential and more aggressive biological behavior than the lower lip carcinomas.
Abstract: O bjective: In this study, the expression of the extracellular matrix proteins was immunohistochemically studied and compared with the histological grading of squamous cell carcinomas of the lower lip and tongue. Material and M ethods: The lower lip carcinomas (n=12) and the tongue carcinomas (n=12) were histopathologically graduated according to Bryne’s method. The immunohistochemical technique utilized specific antibodies to collagen IV and laminin. Histopathologic and immunohistochemical analysis were carried-out on the tumoral invasive front. R esults: Most of lower lip carcinomas (91.7%) was classified in lower score and all tongue carcinomas (100%) in high score malignant grade (p<0.01). Collagen type IV expression was absent in the peritumoral basement membrane in 50% of lower lip carcinomas and in 66.7% of tongue carcinomas (p=0.09). Laminin expression was absent in the peritumoral basement membrane in 66.7% of lower lip carcinomas and in 58.3% of tongue carcinomas (p=0.48). When these two glicoproteins were expressed, they showed a linear, thin and discontinuous pattern and a weak intensity of expression. C onclusion: The high score malignancy grade of the tongue carcinomas associated with the expression pattern of the studied matrix proteins. It suggests that tongue squamous cell carcinomas have more invasive potential and more aggressive biological behavior than the lower lip carcinomas. Keywords C ollagen type IV; Laminin; C arcinoma; I mmunohistochemistry.
TL;DR: Patients with disabilities have high rate of malocclusion and understanding this condition is essential to establish appropriate treatment, and understanding the anterior and the posterior crossbite were more prevalent in DS than in ID and CP.
Abstract: Objective: To evaluate the prevalence of malocclusion in patients with disabilities. Material and Methods : The sample consisted in 98 patients of who had a previous diagnosis of disability. Patientes were divided into three groups: Intelectual Disabilities (ID), Cerebral Palsy (CP) and Down Syndrome (DS). They were evaluated according to Angle malocclusion classification, presence or absence of posterior crossbite, anterior crossbite and anterior open bite. Statistical analysis of the data was performed using the Kruskal Wallis test at 5% significance level. Results : Class II malocclusion was more frequent in the three groups (CP 45.45%, ID 40.43% and DS 50.00%); the anterior and the posterior crossbite were more prevalent in DS (p < 0.0001). The anterior open bite was more prevalent in CP (p < 0.0001). Conclusion: Patients with disabilities have high rate of malocclusion and understanding this condition is essential to establish appropriate treatment. Keywords: Orthodontics; Malocclusion; People with disabilities.
TL;DR: The surface infiltrated with an infiltrating resin (Icon) did not negatively affect the bond strength between resin composite and enamel and the demineralized and remineralization groups with sodium fluoride and artificial saliva presented statistically lower results when compared to the other groups.
Abstract: Objective : To evaluate the bond strength between resin composite and different enamel substrates: sound enamel; demineralized enamel submitted or not to remineralization; and demineralized enamel infiltrated with aninfiltrating resin. Material and Methods : 120 bovine teeth were selected, the root portion was removed and the enamel finished. Specimens were divided into the following groups: (A) Control (n=24): adhesively treated and restored; (B) (n=96): the samples were immersed in a demineralization solution to create white spot lesions and divided into four subgroups: (B1) demineralized enamel; (B2) samples were stored in artificial saliva (8 weeks); (B3) samples were stored in a 0.05% sodium fluoride solution (1 min day/8 weeks); (B4) samples were treated with an infiltrant resin (Icon, DMG). The groups were treated with one of the following adhesives: Clearfil S3 Bond Plus (Kuraray) or Single Bond Universal (3M ESPE), followed by the resin composite application (Filtek Z 350 XT, 3M ESPE). The specimens were submitted to thermalcycling aging (10,000 ×; 2±5oC, 50±55oC and 37°± 2°C). The specimens were sectioned into prism shapes with ~1mm² of base and submitted to microtensile test. The collected data were submitted to ANOVA and Tukey´s test (α= 5%). Results : The Means (±SD) in MPa were: Clearfill S3 Bond Plus: Control (17.17±3.52); B1 (11.60±0.74); B2 (6.83±1.87); B3 (8.38±1.59) and B4 (27.00±1.76); Single Bond Universal: Control (26.26±3.19); B1 (10.94±2.00); B2 (11.05±1.74); B3 (15.63±1.25) and B4 (22.60±2.29). Conclusion : The surface infiltrated with an infiltrating resin (Icon) did not negatively affect the bond strength between resin composite and enamel. The demineralized and remineralized groups with sodium fluoride and artificial saliva presented statistically lower results when compared to the other groups.
TL;DR: The malignant prevalence observed in this Brazilian sample may be due to the nature of the population or, most probably, to thenature of the source, a referral hospital center in the city.
Abstract: Objective: The aim of this study was to determine the range of oral histopathological diagnoses in a Brazilian survey obtained from a surgical pathology hospital laboratory. Material and Methods: A retrospective cross-sectional study was performed, and all histological slides from the oral and maxillofacial region during a 14-year period were reviewed. The materials were grouped into five major diagnostic categories, and age and sex were specified. Results: A total of 769 samples were collected and submitted for histopathological analysis. There were 245 oral cases, which were divided into 48 different diagnoses. There was no sex predilection, and the mean age was about 44 years old. Proliferative non-neoplastic lesions (43.2%) and malignant neoplasms (26.5%) comprised the main two groups of diagnoses. Conclusion: The malignant prevalence observed in this Brazilian sample may be due to the nature of the population or, most probably, to the nature of the source, a referral hospital center in the city.
TL;DR: EGCG produced resin-dentin bonds that did not change after 6 months water storage but it decreased the immediate bond strength when compared to control and chlorhexidine groups.
Abstract: Objective - This study evaluated the effect of 0.2% chlorhexidine gluconate solution (CHX), green tea and active epigallocatechin-gallate (EGCG) used as therapeutic primers on the long-term bond strength of etch-and-rinse adhesive to dentin. Material and Methods - Eighty bovine incisors were worn to expose an area of dentin, that were acid-etched (37% phosphoric acid) and rinsed. The teeth were divided into 4 groups (n = 20): Group C (Control) - Single Bond; Group CHX - 0.2% CHX for 30s + Single Bond; Group EGCG - active EGCG gel at 10 µM for 30 s + Single Bond; Group GT - aqueous green tea for 30s + Single Bond. Blocks of composite were fabricated and stored for 24 h or 6 months, sectioned into beams and submitted to microtensile tests. Results were analyzed by two-way ANOVA and Tukey’s test (5%). Results - Mean (±SD) values (in MPa) were as follow: CHX (24 h) – 41.76 (±2.62); C (24 h) - 40.81 (±3.35); GT (24 h): 37.38(2.98); CHX (6 months) - 36.04 (±3.52); EGCG (24h) - 35.91 (±4.82); EGCG (6 months) - 35.75 (±4.44); GT (6 months) - 31.95 (±3.40); C (6 months): 30.05 (±1.54). Conclusion - EGCG produced resin-dentin bonds that did not change after 6 months water storage but it decreased the immediate bond strength when compared to control and chlorhexidine groups. Keywords : Tensile bond strength; Dentin; Total-etch adhesives; Chlorhexidine gluconate; Green tea.
TL;DR: In this paper, Caracterizar as lesoes osseas da regiao maxilofacial conjugando seus aspectos clinicos aos imaginologicos, by tomografia computadorizada de feixe conico (TCFC), comparando estes achados da literatura.
Abstract: Objetivo : Caracterizar as lesoes osseas da regiao maxilofacial conjugando seus aspectos clinicos aos imaginologicos, por tomografia computadorizada de feixe conico (TCFC), comparando estes achados da literatura. Material e Metodos : Foram selecionados 12 prontuarios da Clinica de Propedeutica Estomatologica do ICT-UNESP, apresentando lesoes osseas na regiao maxilofacial, com previa indicacao de exame por TCFC, realizados em tomografo i-CAT Next Generation (imaging Sciences International, Hatfield, PA, EUA) na clinica de Radiologia da instituicao. Foram levantadas informacoes clinicas como sexo, faixa etaria e queixas principais. Avaliou-se as imagens de TCFC quanto: localizacao, arquitetura interna e limites da lesao, efeito nas corticais osseas, efeito nos dentes e estruturas de suporte dentario e os aspectos internos da lesao. As imagens foram avaliadas no software i-CAT Vision do tomografo em janelas de reconstrucao multiplanar (MPR). Resultados : Foram estudadas 04 lesoes correspondentes a cistos radiculares, 02 a tumores odontogenicos queratocisticos, 01 a odontoma composto, 01 a hamartoma odontogenico, 01 a displasia ossea focal, 01 tumor odontogenico cistico calcificante e 02 cicatrizes fibrosas. A TCFC auxiliou na conclusao dos diagnosticos, visto sua caracteristica de tridimensionalidade, houve, algumas vezes, divergencias em relacao aos achados descritos na literatura, eminentemente baseados radiografias bidimensionais. Conclusao : a TCFC e de grande valia na caracterizacao das lesoes osseas, observa-se uma necessidade na literatura de uma abordagem especifica para esta modalidade de imagens, diferente das radiograficas convencionais.
TL;DR: Genox® associated with PRP demonstrated a more advanced stage of bone regeneration presenting as an alternative to fill post-extraction alveolus, and groups associated to PRP were effective in the production of mature and immature collagen.
Abstract: A predictable rehabilitation of severely atrophied alveolar ridge defects still remains a matter of concern in implant dentistry. Objective: The aim of this study was to compare histologically biomaterials of bovine (Genox®) and equine (Bio-Gen®) origin associated or not to platelet-rich plasma (PRP), analyzing bone maturity, amount of mature (type I) and immature (type III) collagen present at sixty and ninety days in post-extraction alveolus. Materials and Methods: Four Beagle dogs were used from which the six mandibular premolars were extracted. The alveolus contained respectively: right side, Bio-Gen ® (group B), preserved the clot (group C), Genox ® (group G); left side, Bio-Gen ® + PRP group (BP), Clot + PRP (group CP) and Genox ® + PRP (group GP). After sixty and ninety days, two dogs were sacrificed at each date and the pieces were histologically processed and stained with picrosirius red, a specific stain for analysis of different types of collagen. Results: Comparisons of the averages of mature collagen at 60 days indicated significant differences between Group G when compared to Groups C and B. The biomaterial of bovine origin demonstrated higher amounts of mature collagen in 90 days while the biomaterial of equine origin had a higher average of immature collagen in 90 days. Conclusion: Groups associated to PRP were effective in the production of mature and immature collagen. Genox® associated with PRP demonstrated a more advanced stage of bone regeneration presenting as an alternative to fill post-extraction alveolus.