Abstract
The present study assessed the influence of tightening strength of abutment on the occurrence of cracking on the screw part of abutment. When the abutment (Platon Japan) was tightened at 15 N in a titanium implant (Platon Japan) inclined vertically by 50 degrees, the maximum load at which cracking occurred in the screw of abutment was 434.4±2.9 N (n=5). On the other hand, the maximum loads of the screw part of abutment, which inclined by 14 degrees and 12 degrees, were 1,624.0±100.0 N and 2,288.9±59.8 N, respectively. When the abutment was tightened at 30 N in an implant inclined vertically by 50 degrees, the maximum load at which cracking occurred in the screw part of abutment was 424.6±13.7 N (n=5). On the other hand, the maximum loads of the screw part of abutment, which inclined by 14 degrees and 12 degrees, were 1,548.5±54.9 N and 2,315.4±51.0 N, respectively. There was no statistical significance between the results obtained from tightening of 15 N and 30 N. These results suggest that the Platon titanium implant and abutment possess sufficient mechanical strength when tightened at a minimum of 15 N, and thus provide favorable clinical results.
