Dental Prosthesis ; Humans ; Prosthodontics ; methods

Computer-Aided Design ; Humans ; Prosthodontics ; methods ; trends ; Technology, Dental

Target restoration space (TRS) is the most precise space required for designing optimal prosthesis. TRS consists of an internal or external tooth space to confirm the esthetics and function of the final restoration. Therefore, assisted with quantitive analysis transfer, TRS quantitative analysis is a significant improvement for minimum tooth preparation. This article presents TRS quantity-related measurement, analysis, transfer, and internal relevance of three TR. classifications. Results reveal the close bond between precision and minimally invasive treatment. This study can be used to improve the comprehension and execution of precise esthetic prosthodontics.
Esthetics ; Esthetics, Dental ; Humans ; Prosthodontics ; methods ; Tooth Preparation

In recent years, with the rapid development of digital technology, the application of oral virtual patients in prosthodontics, orthodontics, oral and maxillofacial surgery, and other disciplines has gradually increased. Although the focus on oral virtual patients varies in different disciplines, the application of oral virtual patients in assisting the prediction of treatment effects and the formulation of treatment plans will have good prospects. The construction accuracy and presentation effects of oral virtual patients can be influenced by the source of three-dimensional (3D) image, and methods of registration. Based on the studies and clinical experiences of our team, researches of other teams, the source of 3D images, the construction methods, and the clinical applications of virtual patients in prosthodontics will be presented, so as to provide a reference for normalized application and development of oral virtual patients and to offer a future development direction of oral virtual patients.
Humans ; Prosthodontics/methods* ; Imaging, Three-Dimensional ; Orthodontics ; Surgery, Oral

OBJECTIVETo develop a three-dimensional multimedia system for enhancing the efficiency of dental education and chairside communication.

METHODSA set of three-dimensional digital models of normal teeth and jaws related to dental education in prosthodontics were acquired or established under Microsoft Windows. The three-dimensional models were re-edited and rendered with texture attached, producing a large number of three-dimensional pictures and short animated pictures. A software platform was established for displaying all sorts of media, including the three-dimensional models. Finally, all media files produced or gathered before were integrated into the platform, similar to the textbook in chapter adopted in dental education at university.

RESULTSThe prosthodontic three-dimensional multimedia system was successfully developed. The system covered basic information within the current textbook of prosthodontics, three-dimensional pictures, animated pictures, and virtual three-dimensional scenes. The system might serve as an assistant tool in dental education and chairside communication.

CONCLUSIONSIt is technically feasible to establish the prosthodontic three-dimensional multimedia system, according to experiences in this study. The success also anticipates the possibility and feasibility of developing similar systems in other disciplines of dentistry.

PURPOSE: Template-guided implant therapy has developed hand-in-hand with computed tomography (CT) to improve the accuracy of implant surgery and future prosthodontic treatment. In our present study, the accuracy and causative factors for computer-assisted implant surgery were assessed to further validate the stable clinical application of this technique. MATERIALS AND METHODS: A total of 102 implants in 48 patients were included in this study. Implant surgery was performed with a stereolithographic template. Pre- and post-operative CTs were used to compare the planned and placed implants. Accuracy and related factors were statistically analyzed with the Spearman correlation method and the linear mixed model. Differences were considered to be statistically significant at P< or =.05. RESULTS: The mean errors of computer-assisted implant surgery were 1.09 mm at the coronal center, 1.56 mm at the apical center, and the axis deviation was 3.80degrees. The coronal and apical errors of the implants were found to be strongly correlated. The errors developed at the coronal center were magnified at the apical center by the fixture length. The case of anterior edentulous area and longer fixtures affected the accuracy of the implant template. CONCLUSION: The control of errors at the coronal center and stabilization of the anterior part of the template are needed for safe implant surgery and future prosthodontic treatment.
Axis, Cervical Vertebra ; Dental Implants ; Humans ; Methods ; Prosthodontics ; Surgery, Computer-Assisted

Teeth wear and extrusion of antagonist are commonly observed in deep bite patient having severe vertical and horizontal overlap. These problems cause collapse of occlusal plane and abnormal anterior guidance. Without restoring harmonious occlusion, loss of multiple teeth and decreased masticatory function could not be prevented. To resolve problems associated with deep bite, multidisciplinary treatment including oral surgical, orthodontic and prosthetic treatment should be performed. This clinical report describes the results of increasing occlusal vertical dimension with a full-mouth restoration procedure. The treatment procedures include extraoral and intraoral examination, diagnosis, treatment planning, diagnostic wax-up, segmental osteotomy, orthodontic intrusion and prosthodontic rehabilitation. Full mouth rehabilitation with increasing occlusal vertical dimension can solve esthetic and functional problems.
Dental Occlusion ; Diagnosis ; Humans ; Methods ; Mouth Rehabilitation* ; Osteotomy* ; Overbite* ; Prosthodontics ; Rehabilitation ; Tooth ; Vertical Dimension

PURPOSE: This study aimed to assess the agreement between 2 raters in evaluations of students on a prosthodontic clinical practical exam integrated with directly observed procedural skills (DOPS). METHODS: A sample of 76 students was monitored by 2 raters to evaluate the process and the final registered maxillomandibular relation for a completely edentulous patient at Mansoura Dental School, Egypt on a practical exam of bachelor’s students from May 15 to June 28, 2017. Each registered relation was evaluated from a total of 60 marks subdivided into 3 score categories: occlusal plane orientation (OPO), vertical dimension registration (VDR), and centric relation registration (CRR). The marks for each category included an assessment of DOPS. The marks of OPO and VDR for both raters were compared using the graph method to measure reliability through Bland and Altman analysis. The reliability of the CRR marks was evaluated by the Krippendorff alpha ratio. RESULTS: The results revealed highly similar marks between raters for OPO (mean= 18.1 for both raters), with close limits of agreement (0.73 and −0.78). For VDR, the mean marks were close (mean= 17.4 and 17.1 for examiners 1 and 2, respectively), with close limits of agreement (2.7 and −2.2). There was a strong correlation (Krippendorff alpha ratio, 0.92; 95% confidence interval, 0.79–0.99) between the raters in the evaluation of CRR. CONCLUSION: The 2 raters' evaluation of a clinical traditional practical exam integrated with DOPS showed no significant differences in the evaluations of candidates at the end of a clinical prosthodontic course. The limits of agreement between raters could be optimized by excluding subjective evaluation parameters and complicated cases from the examination procedure.
Centric Relation ; Dental Occlusion ; Education, Dental ; Educational Measurement ; Egypt ; Humans ; Methods ; Prosthodontics ; Schools, Dental ; Vertical Dimension

Finite element stress analysis has been widely used in stomatology. In this article, we summarized the stress distributions of all-ceramic crowns, post crowns, fixed partial dentures and implant support fixed dentures; and with the use of finite element method, we investigated the stress levels of the periodontal ligament of abutment. The results showed: the tensile stress and compressive stress concentrated at the cervical margin of all-ceramic crown and post crown; the stress at the surface of the crown was the highest; the stress concentration exhibited at the connector of fixed parital denture, the molar was an ideal abutment tooth for the fixed bridge; the largest stress appeared around the neck of the implant abutment. These results have provided a theoretical basis for clinical dentistry in terms of restoration design and manufacture. It is suggested that clinical dentists should be careful to avoid the horizontal laoding applied on the prostheses so as to improve the resistance of abutment tooth to fracture.
Crowns ; trends ; Dental Stress Analysis ; Denture, Partial, Fixed ; trends ; Humans ; Principal Component Analysis ; Prosthodontics ; methods ; Tooth Preparation, Prosthodontic ; methods ; trends

PURPOSE: The most important factor in longevity studies of dental prostheses is objective and consistent evaluation of the prosthesis. The Korean Academy of Prosthodontics suggested developing a standardized method for longevity studies of dental prostheses. The purpose of this study is to evaluate previously-used criteria and to develop new criteria, in the form of a procedure flowchart and an evaluation sheet. These new criteria may be able to provide a unified standard for future longevity studies of dental prostheses. MATERIALS AND METHODS: A literature review was performed about the evaluation of dental prostheses. Taking into account the strengths and weaknesses of previously used criteria, a novel, intuitive and objective method was developed for assessment of dental prostheses. Then, a pilot survey was performed with the newly developed flowchart and evaluation sheet to determine problems and implement possible improvements. RESULTS: Thirty cases of fixed dental prosthesis (FDP), 25 cases of removable dental prosthesis (RDP), and 13 cases of implant supported prosthesis (ISP) were evaluated. The average life expectancy estimate was 12.82 years for FDP, 5.96 years for RDP, and 4.82 years for ISP with Kaplan-Meier survival analysis. Additionally, possible improvements discovered by the pilot survey were reflected in the flowchart and evaluation sheet. CONCLUSION: The newly developed KAP criteria, flowchart and evaluation sheet enabled objective and consistent results in trial longevity studies of dental prostheses. It is expected that future studies will not only use the KAP criteria but also further improvement will be made on them.
Data Collection ; Dental Prosthesis* ; Kaplan-Meier Estimate ; Korea* ; Life Expectancy ; Longevity* ; Methods ; Prostheses and Implants ; Prosthodontics* ; Software Design ; Survival Rate