الفهرس 
Angled abutmentOnly 14 pages are availabe for public view
 |  | from | 175 |  |  |
| | | from | 175 | | |
Abstract
Ideally, dental implants should be aligned vertically with the axial forces. When the long axis of the implant fixture and the long axis of the planned prosthetic tooth is not aligned, angled abutment is often the abutment of choice for prosthodontic restorations. Nowadays angled abutments vary from 15° to 35° angulation. In other cases, significant vertical space that has not been corrected with vertical ridge augmentation may necessitate selection of longer abutments, which would lead to an increased vertical cantilever.Furthermore, selection of the height of abutment collar would be affected if different distances between the implant platform and the gingival This in-vitro study was performed to evaluate screw loosening by measuring RTV(Ncm) of abutment screw for three different abutment angulations and two abutment collar length before and after dynamic cyclic loading by using digital torque gauge.Ninety implants were selected for this in-vitro study and divided into three equal groups, thirty each, according to abutment angulation (0°,15°,25°).Each group was divided into two subgroups (fifteen each) according to collar length (2, 4mm).Data analysis was performed in several steps. The initial and postload Data analysis was performed in several steps. The initial and postload RTL ratio were analyzed using the SPSS statistical analysis version 20.ANOVA and Tukey’s post hoc test at 0.05 level of significance were performed to compare all test groups.