Dinamik Yüklenen Titanyum ve Zirkonya İmplant Dayanaklarının Kantileverli Sabit Dental Protezler Altında Kırılma Dayanıklılıklarının Değerlendirilmesi
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Comparing The Fracture Resistance of Zirconia and Titanium Abutments with 2 or 3 Unit Cantilevered FDPs After Exposure to the Artificial Mouth, Hacettepe University Health Sciences Institute PhD Thesis in Prosthodontics, Ankara, 2014. Aim of the study was to compare the fracture resistances of Titanium (Ti) and IPS e.max (Zr) abutments after dynamic loading using chewing simulator, evaluating the reliability of the IPS e.max abutments which were restored with cantilevered FDPs and comparing the effect of the number of supporting implants on fracture resistance of the abutments. four different test groups representing four different clinical scenarios were used. The clinical situations like presence of an edentulous space for two or three teeth in the maxillary anterior zone were created. All groups were including eight specimens. Full contour Cr-Co frameworks were fabricated using CAD/CAM technology. All of the samples were dynamically loaded using a chewing simulator, thereafter tested for the maximum fracture resistance. Pair-wise Wilcoxon rank tests were performed to test for differences in fracture resistance values with a global significance level of 0,05. All test specimens survived aging after exposure to the artificial mouth. No screw loosening was recorded. The median fracture resistance was 226, 551, 601and 664 N for groups one and two implants with Zr abutment, and one or two implants with Ti abutments respectively. Statistically significant differences were found for the comparisons of Ti and Zr groups (p<00.5). Also the number of supporting implants were affecting significantly the fracture resistance of both abutments. The fracture resistance values for 3 unit bridges were significantly high for each abutment material. Results of this study showed that all tested implant-supported restorations have the potential to withstand physiological occlusal forces applied in the anterior region. Within the limitations of this in-vitro study, it can be concluded that, cantilevered restorations with splinted design instead of single implant supported cantilevered FDP design might be recommended, also the use of two implant supported cantilevered FDPs with Zr abutments can be considered as a reliable clinical option.