Saudi Cultural Missions Theses & Dissertations
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Item Restricted Survival Rates, Technical Complications and Dimensions of Monolithic Zirconia Fixed Complete Arch Dental Prostheses(Tufts University School of Dental Medicine, 2024) Malluh, Ahmad; Papaspyridakos, Panos; Vazouras, Konstantinos; Finkelman,Matthew; Kudara, Yukio; Papaspyridakos,PanosOBJECTIVE: The primary objective of this study was to assess the survival and complication rates of monolithic zirconia implant-supported fixed full dental prostheses (IFCDPs) in completely edentulous patients following a minimum 1-year clinical follow-up. Additionally, the study sought to evaluate associations between risk indicators, structural dimensions, and quality-of-life outcomes. MATERIALS AND METHODS: This observational, single-center retrospective cohort study included a convenience sample of 44 participants who received 61 zirconia IFCDPs at Tufts University School of Dental Medicine (TUSDM). Data on demographics, clinical variables, technical complications, and prosthesis dimensions were collected. Descriptive statistics were calculated, and associations between independent variables and complications were analyzed using generalized estimating equations (GEE). Statistical analyses were performed using SPSS v.28 (IBM Corp., Armonk, NY, USA) and SAS 9.4 (SAS Institute Inc., Cary, NC, USA). RESULTS: The study included 44 participants (45.5% female, 54.5% male; mean age 67.07 (SD=12.1) years) with a mean prosthesis use duration of 28.67 (SD=18.32) months. The majority (72.7%) did not use a nightguard, and 25% reported bruxism. Opposing dentition included natural teeth (13.1%), implant-supported prostheses (50.8%), removable prostheses (14.8%), a combination of teeth and implants (19.7%), and implant overdentures (1.6%). Of the 61 prostheses, 52.5% were maxillary, and 47.5% were mandibular. Minor technical complications included Ti-base decementation (13%), chipping (12%), loss of access hole material (13%), and wear of prosthetic screws (11.5%). Major complications were infrequent, with fracture of screws (2%) and fracture of frameworks (3%). The overall prosthesis survival rate was 93.44%, with a mean total complication rate of 0.8 (SD=1.15)events per prosthesis. Structural analysis identified reduced dimensions at critical cross-sections as potential contributors to fractures. CONCLUSION: This study demonstrated a 93.44% survival rate for monolithic zirconia IFCDPs over an average follow- up period of 28.67 months. While the prostheses showed high reliability, minor technical complications were relatively common, highlighting the need for routine maintenance. The findings underscore the importance of prosthesis design and risk factor consideration in treatment planning. Larger, multicenter studies with longer follow-up periods are recommended to validate these findings and provide greater insights into the long-term performance of zirconia prostheses.22 0Item Restricted Evaluation of marginal and internal adaptation of fixed dental restorations on alveolar casts printed with different 3D printers.(Tufts University School of Dental Medicine Boston MA, 2024) Eidah, Rawan; Papaspyridakos, PanagiotisThis in-vitro study evaluates the marginal and internal adaptation of fixed dental restorations created using three different 3D printing technologies: Carbon Digital Light Synthesis™ (Carbon DLS™), Straumann P30, and Formlabs Form 3B+. A reference cast was prepared, digitized, and printed using the respective 3D printers. Measurements of adaptation were conducted utilizing a light microscope. The findings revealed significant differences in adaptation among the printers, particularly in the incisal buccal regions, with the Carbon DLS™ exhibiting superior performance, achieving the smallest mean marginal gap compared to the others. In contrast, non-significant differences were observed in the middle and cervical regions. The results underscore the importance of selecting suitable 3D printing technology to meet clinical requirements, suggesting that Carbon DLS™ is especially effective for complex dental restorations that require high precision. This study contributes valuable insights into the evolving field of digital dentistry, emphasizing the role of technology in enhancing patient outcomes in dental restorations. Keywords: Dental Restoration, 3D Printing, Marginal Adaptation, Internal Adaptation, Digital Dentistry, Prosthodontics46 0