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KMID : 0362420170550030251
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대한치과보철학회지
2017 Volume.55 No. 3 p.251 ~ p.257
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Influence of internal connection length on screw loosening in internal connection implants
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Kim Ji-Sun
Park Young-Bum
Choi Hyun-Min
Kim Sung-Tae
Kim Hyeon-Cheol
Kim Sun-Jai
Moon Hong-Seok
Lee Jae-Hoon
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Abstract
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PURPOSE. The purpose of this study was to evaluate whether the internal abutment length affected screw stability in an internal connection implant.
MATERIALS AND METHODS. Twenty long internal connection implants (Replus system, 4.7 × 11.5 mm) were selected for this investigation. Abutments were assigned to four groups depending on the length of the internal connection (abutments with internal lengths of 1, 2, 3, and 4 mm, respectively). Each implant fixture specimen was embedded in resin medium and connected to an abutment with an abutment screw. A load of 100 N, applied at an angle of 30 to the long axis of the implant, was repeated for 1.0 × 106 cycles. Reverse torque values (RTV) were recorded before and after loading, and the change in RTV was calculated. Data were analyzed with the Kruskal-Wallis test.
RESULTS. The change in RTV was not significantly different among the groups (P>.05). Screw loosening and fractures were not observed in any groups, and joint stability was maintained.
CONCLUSION. The internal length of the abutment may not significantly affect the degree of screw loosening.
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KEYWORD
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Screw loosening, Reverse torque, Internal connection implant, Internal connection length
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