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- Title
Influence of internal connection length on screw loosening in internal connection implants.
- Authors
Ji-Sun Kim; Young-Bum Park; Hynmin Choi; Sungtae Kim; Hyeon Cheol Kim; Sun Jai Kim; Hong-Seok Moon; Jae-Hoon Lee
- Abstract
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. (J Korean Acad Prosthodont 2017;55:251-7)
- Subjects
DENTAL abutments; DENTAL screws; DENTAL implants
- Publication
Journal of Korean Academy of Prosthodontics, 2017, Vol 55, Issue 3, p251
- ISSN
0301-2875
- Publication type
Article
- DOI
10.4047/jkap.2017.55.3.251