The influence of polishing techniques on pre-polymerized CAD\CAM acrylic resin denture bases

Introduction: Prosthodontics is a challenging subject for dental students. This study explores the incidence of exam anxiety among prosthodontics students and the variables that moderate it. Methods: A cross-sectional, self-administered questionnaire was distributed to fourth-year undergraduate students immediately before examinations, with a 77% response rate (55.7% female, 44.3% male). Results: A lack of time to prepare before exams and an inability to recall before exams were the main factors affected by gender. In addition, 63.5% of male students agreed that social media and mobile phones are distractions, while 81.8% of female students disagreed (P<0.001). Within the removable prosthodontic courses (preclinical or clinical), 61.0% of students agreed that a lack of time to prepare before exams is an issue with the clinical course, while 58.5% of the students moderately agreed it is an issue with the preclinical course (P=0.044). A lack of time to prepare, fear of failure, and the time of the examination were of greater concern with regard to quizzes than with mid-term examinations. Conclusion: This study highlights the presence of exam anxiety among prosthodontics students, as well as how that anxiety is influenced by gender, clinical courses, and the type of exam. This study suggests that students should be taught strategies to improve their study, life and time-management skills in order to overcome exam anxiety. This study additionally suggests that improving success rates in dental school requires placing an increased focus in the curriculum on test competency and examination patterns.

Introduction: Computer-aided design (CAD) and computer-aided manufacturing (CAM) monolithic crowns are gaining momentum. Limited evidence exists about the effect of tooth preparation total occlusal convergence (TOC) on marginal and internal gap distances in ­addition to load to fracture values. Aim: The aim of this study was to evaluate, by microcomputed tomography (µCT), the influence of 12° and 20° TOC on marginal and internal adaptation of zirconia-reinforced lithium silicate (ZLS) crowns. Moreover, values of load to fracture with and without initial cyclic loading (CL) were compared. Material and methods: Forty ZLS crowns were fabricated on dies with TOC of 12° and 20°, 20 crowns for each group. µCT was used to compare marginal and internal adaptation. Each specimen was measured at 140 points distributed on all tooth preparation surfaces for 2D gap distance assessment. 3D gap volume was also evaluated. Crowns were then cemented and divided into two subgroups; the first was stored in distilled water (no cyclic loading [NCL] subgroup), the second was subjected to CL (CL subgroup). Results: Factorial repeated measures ANOVA followed by Bonferroni post hoc in addition to independent and dependent t-tests were used for statistical analysis. Marginal gap, absolute marginal discrepancy, and occlusal gap measurements showed significant differences between the measurement sites. Static load to fracture values showed significant differences between TOC groups for both NCL (P=0.011) and CL (P=0.025) subgroups. Conclusion: An increase of TOC from 12° to 20° did not affect marginal and internal adaptation but resulted in higher values of load to fracture of ZLS crowns. CL simulating 1 year of service did not result in fatigue failure.

Background: Dental implants (DI) are gaining popularity among the general population, and special consideration has been given to the geriatric population in the replacement of missing teeth subject to their medical stability. The study aimed to assess the awareness, knowledge, and acceptance regarding DI among the geriatric population of Jeddah, Saudi Arabia. Methodology: A cross-sectional survey was carried out through face-to-face interviews using a pretested and standardized questionnaire by calibrated interviewers. Participants of age >58 years who have not undergone any implant or bone graft procedures attending different prosthodontic clinics in Jeddah were recruited according to availability after obtaining consent. Responses received were converted into digital format and subjected to statistical analysis. Results: The knowledge related to DI was not satisfactory, and only 4.5% showed good knowledge. The willingness to replace the current prosthesis with DI was found in 49.6%, and it was also observed that 40% of the participants were using some tooth-supported fixed dental prosthesis. Only 41.3% and 31% were aware of bone graft and sinus lift procedures related to DI. Conclusion: Even though most participants were aware of DI, the knowledge related to it was little satisfactory. Older people should be appropriately explained about the best treatment choice for teeth replacement by connecting to their current systemic health condition with its benefits and long-term effects. Unexpectedly, the awareness related to bone graft and sinus lift procedures related to DI was found to be relatively acceptable as well as the willingness to accept bone graft if needed for DI placement was observed.

Inter-rater and intra-raters’ variability in evaluating complete dentures insertion procedure in senior undergraduates’ prosthodontics clinics