Showing papers on "Dental laboratory published in 2019"

Trueness analysis of zirconia crowns fabricated with 3-dimensional printing.

Abstract: Statement of problem The primary manufacturing method of zirconia ceramic crowns is computer-aided design and computer-aided manufacture (CAD-CAM), but a disadvantage of this technique is material waste. Three-dimensional (3D) printing, which has been recently introduced into dentistry, has improved the processing of polymers and metals, but not yet of ceramic crowns. Purpose The purpose of this in vitro study was to evaluate the 3D trueness of zirconia crowns fabricated by 3D printing to investigate the potential application of this technology in dental ceramic restorations. Material and methods A typodont tooth was prepared for a ceramic crown, and a digital crown was designed using the CAD software. The digital crown was processed either with a 3D-printing system or with a dental milling system. The crowns were scanned using a dental laboratory scanner, and the data collected for each crown were divided into 4 parts (the external surface, intaglio surface, marginal area, and intaglio occlusal surface). Finally, the trueness of each part was determined using the 3D inspection software. The 3D trueness of the crowns fabricated by either 3D printing or milling was compared by a 1-sided test (α=.05). Results The trueness of the external surface, intaglio surface, marginal area, and intaglio occlusal surface of the 3D-printed crowns was no worse than the corresponding trueness of the CAD-CAM crowns (P Conclusions Zirconia crowns produced by 3D printing meet the trueness requirements, and 3D printing may be suitable for fabricating zirconia crowns.

Comparison of nonscheduled, postinsertion adjustment visits for complete dentures fabricated with conventional and CAD-CAM protocols: A clinical study.

Abstract: Statement of problem Unscheduled denture-adjustment visits may disrupt both patients and clinicians. Denture-adjustment visits have not been correlated with denture-processing methods. Purpose The purpose of this clinical study was to identify differences in the number of unscheduled postinsertion-adjustment visits of patients with complete dentures fabricated by injection molding (IM) versus dentures fabricated by computer-aided design and computer-aided manufacturing (CAD-CAM). Material and methods One hundred six participants were evaluated in the study. They were consecutively treated in a private practice setting and followed up for 1 year after the insertion of new complete dentures. The first 33 received dentures fabricated using an IM system, and the other 73 were milled using a CAD-CAM system. All participants had been edentulous for at least 1 year. Participant ages ranged from 29 to 83 years. IM dentures were fabricated by a commercial dental laboratory; CAD-CAM dentures were milled by a commercial manufacturer. All participants were scheduled for 1- or 2-week postinsertion office visits. Further adjustment visits were scheduled according to participant request. The results were tabulated, and univariable tests of association were performed including chi-square and the Fisher exact tests for categorical comparisons and the Wilcoxon rank sum test for comparison of ordinal continuous data. A multivariable logistic regression model was used to control for the influence of multiple predictor variables on the outcome of interest. Results Edentulous years ranged from 1 to 60. Approximately one half (n=56) of all participants returned for scheduled postinsertion visits approximately 1 to 2 weeks after insertion of the dentures. No significant demographic or clinical differences were noted between participants receiving CAD-CAM or conventional dentures. Return visits for unscheduled adjustments were not associated with the method of denture fabrication or any other demographic features (P=.55). Conclusions Based on the results of this study, there were no significant differences in the number of unscheduled, postinsertion visits for participants whose dentures were fabricated following IM or CAD-CAM milling protocols. Clinicians may choose to fabricate complete dentures with either protocol and expect similar clinical results in terms of the number of unscheduled postinsertion visits.

Glass-ceramics for dental restoration

Abstract: The most important challenge in the development of materials for prosthodontics is to fulfill the needs of patients for biocompatible, durable, reliable, and esthetic dental restorations. No less important is to provide the professionals in a dental laboratory or a dentist's surgery with reliable materials that can be processed according to established workflows. Increasing standards on the patient’s side, e.g., esthetics or metal-free restorations, and the advancement of dental workflows, e.g., digitalization, are the main driving force for research and development in the field. Multifunctional properties of glass-ceramic materials and prospects of glass-ceramic engineering accommodates well with these versatile requirements. Therefore, glass-ceramics took an important role in restorative dentistry. The potential of engineering glass-ceramics for dental applications will be discussed using examples of research and product development conducted by Ivoclar Vivadent AG. The chemical composition of the base glass as well as controlled nucleation and crystallization are crucial topics in the engineering of glass-ceramics. For this reason, two commercialized bioinert materials (IPS e.max and IPS Empress) that are representatives for two fundamentally different nucleation and crystallization mechanisms will be presented. The application of bioactive materials in medicine and in dentistry is restricted to implant materials or coatings of implant materials as well as stimulus for the growth of natural bone during a bone augmentation treatment. Research on bioactive rhenanite glass-ceramics will be presented.

CAD/CAM Beyond Intraoral Restorations: Maxillofacial Implant Guide.

Abstract: With a digital revolution impacting nearly all industries and disciplines, the incorporation of digital technologies into dental offices and laboratories appears to be inevitable. Highlighting the use of computer-aided design/computer-aided manufacturing (CAD/CAM) technology, this case report demonstrates the development of a maxillofacial prosthesis after creation of a 3-dimensional printed surgical guide to enable accurate and predictable implant positioning to enhance overall facial prosthetic retention and comfort for the patient. The management of lost craniofacial hard and soft tissues due to congenital abnormalities, trauma, or, in this case, cancer treatment poses a multifaceted challenge to not only oral and maxillofacial surgeons but also general dentists, prosthodontists, dental laboratory technicians, and other dental and medical professionals. CAD/CAM technology may be viewed beyond its use for teeth reconstructions and intraoral implants and become an important tool for success when implant-supported maxillofacial prosthetic components are needed.

Training and counseling on disinfection during repair of acrylic resin dentures at dental laboratories in surabaya and jember

Abstract: Background: The dentist who handles a broken acrylic resin denture base case will send the denture to be repaired by a dental technician in the dental laboratory. The transfer of work is likely to pose a risk of cross-infection (for example AIDS, hepatitis, tuberculosis, pneumonia, and herpes. Purpose: To transfer science and technology based on community needs objectively to get a strong foundation in implementing health management for dental technicians. Methods: Training on how to use disinfection materials as well as participatory counseling using slides through LCD projectors, and using props along with interactive discussions and also mentoring when trainees take disinfection measures. Results: The implementation includes 3 activities, that is counseling, training and monitoring Counseling is carried out by providing knowledge about how to disinfect dentures, then training in how to do disinfection, the way is to train dental technicians to disinfect using chlorhexidine by spraying on the denture surface, then monitored. Conclusion: So far the dental laboratory has not carried out any disinfection at the time of denture repair. With counseling and training in this community partnership program, dental technicians know the importance of disinfection denture to prevent cross infection, so that it will then do it.

Pattern Of Demand For Making Dentures At Dental Laboratory In Surabaya City, Indonesia

Abstract: Background: Dental laboratory in Surabaya frequently make various kinds of the denture. But surely there is a case that was the most commonly accepted, to adjust to the needs of dental laboratories on the priorities of the work was done, it was necessary to give attention to the case that many common and must be taught to students Dental Technology. Purpose: To find an overview of the number the dentures received by the dental laboratory in Surabaya from 2013 until 2017. Methods: The data used is secondary data from a dental laboratory in Surabaya from 2013 to 2017. Result: A request for flexible and RPDs porcelain, acrylic resin and metal in 5 years obtained tend to be stable in high demand, even ina given year a sharp increase in RPDs flexible and drastic decline on fixed porcelain denture. Instead of facing acrylics, fixed denture tends to stabilize at its lowest during the period. While the acrylic RPDs has increased significantly in the last two years, in contrast to metal frame dentures, which decreased at two years latest. Conclusion: Flexible denture significantly better than with acrylic resin conventional denture on parameters taken in this research. Fixed porcelain denture are mostly made by a dental laboratory when compared with a removable partial denture acrylic resin.