Showing papers by "Allyson Nogueira Moreira published in 2018"
TL;DR: In shear bond strength testing, bovine teeth can be a suitable alternative for permanent and deciduous human teeth, for both enamel and dentin substrates, however, they may not be suitable for enamel tensile bond strengthTesting.
Abstract: Purpose To assess whether bovine teeth can be used as viable alternatives for human teeth in tensile and shear bond strength testing. Materials and methods Articles were selected from Web of Science, PubMed, Scopus, LILACS-Bireme, and BBO electronic databases using keywords obtained from Medical Subject Headings (MeSH). Of 1540 potentially eligible studies, 157 were selected for full text analysis. Five independent reviewers (Kappa = 0.89) selected the studies, abstracted information, and assessed quality based on standardized scales. After the analysis, 78 studies comparing bovine teeth to human teeth were found. Only 18 studies comparing bovine and human substrates in bond strength tests were included in the systematic review and 13 in the meta-analysis. Two authors independently selected the studies, extracted the data and assessed the risk of bias. Mean differences were obtained by comparing tensile and shear bond strengths between human and bovine teeth (permanent and deciduous) and considering enamel and dentin separately (subgroup analysis). Statistical analysis was performed using RevMan5.1, with a random-effect model, at a 5% significance level. Results No significant difference was found between human and bovine teeth in tensile tests (p = 0.41) for dentin (p = 0.86), but there was a difference for enamel (p = 0.01). Regarding shear bond strength, no significant difference was found between human and bovine teeth (p = 0.16) either for enamel (p = 0.07) or dentin (p = 0.68). Regarding shear bond strength on deciduous teeth, no significant difference was found between human and bovine substrates (p = 0.54), either for enamel (p = 0.42) or dentin (p = 0.05). Most studies were at high (low or unclear) risk of bias. Conclusions In shear bond strength testing, bovine teeth can be a suitable alternative for permanent and deciduous human teeth, for both enamel and dentin substrates. However, they may not be suitable for enamel tensile bond strength testing. The findings are based on low quality studies (considerable heterogeneity) and should be interpreted with caution.
29 citations
TL;DR: Diastema closure and/or correction of malformed anterior teeth using porcelain laminate veneers is a viable option for the clinician because it restores esthetic harmony.
Abstract: This clinical report describes an 8-year follow-up evaluation using different thicknesses of porcelain laminate veneers of diastema and malformed anterior teeth. Minimally invasive treatment with no preparation or minimal reduction options could be considered and chosen based on the characteristics of each case. Laminate veneers with or without reduction can offer an excellent result regarding esthetics and function. Despite its failure without reduction, this treatment is indicated because it can be applied regardless of the structure of the teeth. At first, no tooth preparation with rotatory instruments was performed, and porcelain laminates of minimum thickness were made for the four maxillary anterior teeth. After 6 years, the adhesive interfaces were stained, and the patient was unsatisfied with the esthetics of her smile. Therefore, at that time, the professional decided to prepare the anterior teeth for porcelain laminate veneers. Diastema closure and/or correction of malformed anterior teeth using porcelain laminate veneers is a viable option for the clinician because it restores esthetic harmony. The patient was very pleased with the new laminate veneers.
20 citations
TL;DR: When NSPT was combined with aPDT, no additional benefits were observed for the periodontal and metabolic clinical parameters.
15 citations
TL;DR: TISPs with IH implants do present lower risk of biomechanical failure, and stress peaks in Model IH were lower in PL, alveolar bone, and periimplant bone.
Abstract: Purpose Biomechanical behavior of tooth-implant-supported prostheses (TISPs) with external and internal implants was compared. Materials and methods Two 3-D models of TISP were designed by varying the implant: external (Model EH) and internal hexagons (Model IH). After loading, von Mises stresses were obtained in implants, abutments, and screws. Principal maximum (σmax) and minimum (σmin) stresses were analyzed in periodontal ligament (PL), alveolar bone, and periimplant bone. Results Model IH showed lower stress peaks in axial loading in the implant and in the screw but higher in abutment. In oblique loading, Model IH had lower stresses in the implant, but higher in the abutment and in the screw. In the σmax analysis for axial and oblique loads, stress peaks in Model IH were lower in PL, alveolar bone, and periimplant bone. In the σmin analysis for axial load, stress peaks in Model IH were lower in PL, but higher in alveolar bone and in periimplant bone. In oblique load, Model IH showed lower stress peaks in PL and alveolar bone, but higher stress peaks in periimplant bone. Conclusions TISPs with IH implants do present lower risk of biomechanical failure.
12 citations
TL;DR: In male HIV-infected patients and controls, ROC curve analyses revealed that the best cut-off value of LAP to define the presence of insulin resistance was 64.8 (sensitivity 86%, specificity 77% and area under the curve 0.824).
Abstract: The lipid accumulation product (LAP) index is an emerging cardiovascular risk marker. We aimed to assess the accuracy of this index as a marker of cardiovascular risk in HIV-infected patients. A cross-sectional study of 133 HIV-infected patients on antiretroviral drugs and 20 non-infected controls was conducted at the outpatient clinic of a referral center of infectious and parasitic diseases. Evaluations included LAP index, homeostasis model assessment (HOMA) index, anthropometric measurements, blood pressure, glucose tolerance test, and cholesterol and triglyceride levels. Body mass index (BMI) was similar in both groups; however, waist circumference was greater in the HIV-infected patients. Triglyceride levels were significantly higher (p<0.001) and HDL cholesterol levels were lower in HIV-infected patients (p<0.001). Plasma glucose (p=0.01) and insulin (p=0.005) levels two hours after a glucose load, HOMA-IR index (p<0.001) and LAP index (p<0.001) were higher in the HIV-infected patients. A positive and significant correlation was found between HOMA-IR index and LAP (r=0.615; p<0.01), BMI (r=0.334; p<0.01) and waist circumference (r=0.452; p<0.01) in the HIV-infected patients. In male HIV-infected patients and controls, ROC curve analyses revealed that the best cut-off value of LAP to define the presence of insulin resistance was 64.8 (sensitivity 86%, specificity 77% and area under the curve 0.824). These results confirm that insulin resistance is more common in HIV-patients on antiretroviral drugs than in HIV-negative controls. A positive and significant correlation was found between the LAP index and the HOMA index, with LAP≥64.8 constituting an additional risk factor for cardiovascular disease in male HIV patients.
8 citations
TL;DR: There was no significant difference in vertical misfit between the titanium and zirconia implant frameworks produced using the computer-aided design/computer- aided manufacturing (CAD/CAM) Zirkonzahn system.
Abstract: Purpose This study compared the vertical misfit of fixed implant-supported titanium (Ti6Al4V) and yttria-stabilized tetragonal zirconia frameworks milled using the computer-aided design/computer-aided manufacturing (CAD/CAM) Zirkonzahn system Materials and methods An aluminum mandibular master cast was used, and four analogs of the Regular CrossFit implant for straight multibase titanium alloy abutments (Institut Straumann) were fixed with self-curing acrylic resin in mandibular canine and second premolar tooth locations with the aid of a parallelometer Scan abutments were placed over the four straight multibase Regular CrossFit abutments to determine their correct three-dimensional (3D) positioning in the virtual model Implant frameworks were designed virtually, and five frameworks of each material (titanium alloy or yttria-stabilized tetragonal zirconia) were milled using the CAD/CAM system Scanning electron microscope (SEM) images, with magnifications of 50×, 250×, and 1,000×, were obtained from three points on the buccal surface, three points on the lingual surface, and three points on the mesial surface of each abutment The measurements were performed in the center of each of the thirds, thus defining points one, two, and three The degree of vertical misfit at the framework-abutment interface was determined using ImageJ software and analyzed using the Student t test (P = 05) Results The mean misalignment value was 6011 ± 0750 μm for the titanium group and 9055 ± 3692 μm for the zirconia group Conclusion Within the limitations of this study, there was no significant difference in vertical misfit between the titanium and zirconia implant frameworks produced using the CAD/CAM system Regardless of the material used, the CAD/CAM frameworks achieved an adequate vertical fit
7 citations
TL;DR: After two years of follow-up, the clinical and radiographic findings demonstrated that the adopted clinical protocol was successful and yielded healthy periodontal tissues with no signs of periradicular pathology.
Abstract: Crown-root fracture is one of the most challenging fracture types in the dental traumatology literature. Traumatized anterior teeth require quick functional and esthetic repair. In the case of a complex crown fracture of the maxillary left central incisor, requiring endodontic treatment, a fiber-reinforced post was used to create a central support stump to restore the dental morphology. This report describes the clinical procedures involved in the treatment. After two years of follow-up, the clinical and radiographic findings demonstrated that the adopted clinical protocol was successful and yielded healthy periodontal tissues with no signs of periradicular pathology.
4 citations
TL;DR: A quantitative investigation of the radial transmission of light through different fiber posts and its influence on the Knoop hardness number (KHN) and bond strength (BS) of a dual-cure self-adhesive resin cement at 3 different depths found LT depended on the type of post and on depth.
Abstract: Context: Light transmission (LT) into deeper areas of the dentin root is limited. Aim: The aim of this study is to perform a quantitative investigation of the radial transmission of light (LT) through different fiber posts and its influence on the Knoop hardness number (KHN) and bond strength (BS) of a dual-cure self-adhesive resin cement at 3 different depths. Materials and Methods: Four types of fiber posts (2 translucent and 2 conventional) were used. LT and KHN analyses were performed in a specially designed matrix, which allowed measurements at 3 different depths. LT was measured using a volt-ampere meter while KHN tests were performed in a microhardness tester. For BS analysis, endodontically treated bovine roots were divided into 4 groups, each group receiving one type of post. After cementation, cross sections of the root were tested for resistance to displacement using a universal testing machine. Statistical Analysis Used: Statistical analysis was performed by using this ANOVA and Tukey's test. Results: For LT, translucent posts showed significantly higher values at all depths compared to the conventional ones. For all posts, LT decreased at the deeper depths. The KHN results showed no statistical differences among the different posts, regardless of depth. For BS, a translucent post showed the highest values, and comparative analyses between the different depths of posts also showed statistically significant differences while comparisons among the different depths of the same post showed no differences. Conclusions: LT depended on the type of post and on depth. The type of post did not significantly influence the cement KHN. A translucent post showed higher BS in pooled data.
3 citations
TL;DR: Acid etching is not necessary to enhance the universal adhesive bond strength and negatively affected the bond strength of the total-etch adhesive system, and without etching the GIC, there is no difference in microtensile bond strength between the adhesive systems.
3 citations
TL;DR: A case of CNF due to odontogenic infection associated with an impacted tooth is reported, and a successful outcome was achieved through aggressive therapy, including radical debridement, appropriate antibiotics, and intense supportive care, followed by surgical tooth removal.
Abstract: Cervical necrotizing fasciitis is a rare polymicrobial infection characterized by extensive rapidly spreading necrosis of the subcutaneous tissue and superficial fascia This paper describes a case of necrotizing fasciitis of odontogenic origin in a year old man who presented with a dental abscess associated with an impacted lower premolar after prolonged use of removable dentures Treatment included extensive surgical debridement systemic antibiotics and intensive care This case highlights the importance of proper evaluation and diagnosis before the rehabilitation of edentulous patients A panoramic radiograph can show the presence of an impacted tooth which must be removed before installation of a removable denture to prevent further complications like that
2 citations
TL;DR: It was possible to restore the shape and function of a severely ankylosed tooth by fabricating a ceramic crown for placement on a resin reconstruction supported by mini fiberglass posts by increasing the retention of the morphological reconstruction for the future support of indirect restorations.
Abstract: Clinical Relevance Ankylosed posterior teeth impede tooth stability in the arch. The literature does not offer evidence regarding the predictability of ankylosed tooth restorations. Additional retention through mini fiberglass posts for composites may be indicated to improve the long-term prognosis.
TL;DR: In this article, a nova superficie bioativa and nanoestruturada of titânio grau 4 revestida com vidro bioativo contendo fosfato de calcio, sintetizada pelo metodo sol-gel, for comparison with a rugosidade superficial and a atividade dos osteoblastos.
Abstract: Resumo Objetivo Avaliar e comparar a rugosidade superficial e a atividade dos osteoblastos em contato com uma nova superficie bioativa e nanoestruturada de titânio grau 4 revestida com vidro bioativo contendo fosfato de calcio, sintetizada pelo metodo sol-gel. Material e metodo Sessenta e tres discos de titânio, medindo 4 mm de diâmetro por 2 mm de altura, foram preparados e divididos em tres grupos: microtexturizado (Ticp - controle); revestido com vidro bioativo e seco a vacuo a 37 °C por 10 dias (BGTi37), e revestido com vidro bioativo e aquecido a 600 °C por cinco horas (BGTi600). Tres especimes de cada grupo foram utilizados para avaliacao da topografia superficial e 18 especimes, para cultura celular. Resultado O revestimento de vidro bioativo diminuiu a rugosidade media quando comparado ao titânio microtexturizado. A proporcao de celulas viaveis, a producao de fosfatase alcalina e o grau de mineralizacao da matriz ossea em contato com os especimes de titânio do grupo BGTi600 foram significativamente menores em relacao aos grupos controle e do titânio microtexturizado. Conclusao Apesar de sua marcante menor rugosidade, a superficie BGTi37 apresentou comportamento biologico semelhante a uma superficie de titânio microtexturizada e moderadamente rugosa. A outra superficie experimental (BGTi600), a de menor rugosidade entre todas as testadas, apresentou os piores resultados de ativacao dos osteoblastos.