الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 98 |  |  |
| | | from | 98 | | |
Abstract
This study was planned to evaluate the influence of abutment types and angulations on the fracture resistance of implant supported all-ceramic crowns. - Materials and methods: Epoxy resin blocks were fabricated to surround implant fixtures and simulate the clinical condition. Abutments were screwed into the implant and all-ceramic crowns were fabricated. Then, cemented on their respective abutments using temporary cement. Strain gauges were bonded to buccal, lingual, mesial, distal and apical areas on resin blocks in relation to the implants. Strains developed around the implants during loading were measured using strain gauges. The fracture resistances of each implant-supported crown were obtained. Results: from the results of this study, it was shown that the strains developed around zirconia abutments was higher when compared to strains developed around the titanium abutments at the load of 250 N. Titanium abutments showed higher fracture resistance than zirconia abutments. Conclusions Within the limitations of this in vitro study, the following conclusions could be drawn: Abutment types and angulations significantly affect micro-strains around implants. Both zirconia and titanium abutments could withstand the functional loads developed during physiologic chewing in the premolar area. Zirconia abutments could be considered as a valid alternative to metal abutments in esthetically demanding areas. Recommendations The results of this study recommended the use of angled abutment whenever indicated.