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KMID : 0988420030150030261
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Journal of Dental Science (C.N.U.)
2003 Volume.15 No. 3 p.261 ~ p.270
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An In Vitro Study of Retained Screw Stability by Various Connection Designs between Fixture and Abutment in Implant Dentistry
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Abstract
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Since the concept of osseointegrated dental implant by Branemark et al was first applied to mandibular full edentulous patients. Recently it is considerated the first treatment option on missing teeth. A common problem associated with dental implant restorations is loosening of screws that retain the prosthesis to the abutment and the abutment to the implant fixture. This study is to examine the influence on screw loosening of implant-abutment designs such as external hex, cone screw, beveled hex, cam cylinder, cylinder hex by means of evaluating the loosening torques, with respect to a range of tightening torques after repeated loading.
The results of this study were as follows.
(1) Cone screw, beveled hex groups are the highest initial tightening rate and cylinder hex, external hex groups are the lowest initial tightening rate(p<0.05).
(2) Cone screw groups are the highest after repeated loading tightening rate and cylinder hex groups are lowest after repeated loading tightening rate(p<0.05).
(3) Cone screw groups have the highest initial stability and final stability.
(4) All groups are decreased tightening rate after repeated loading.
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