J Korean Acad Prosthodont.  2017 Jul;55(3):251-257. 10.4047/jkap.2017.55.3.251.

Influence of internal connection length on screw loosening in internal connection implants

Affiliations
  • 1Department of Prosthodontics, Yonsei University College of Denistry, Seoul, Republic of Korea. jaehoon115@yuhs.ac, hsm5@yuhs.ac
  • 2Oral Science Research Center, BK21 PLUS Project, Yonsei University College of Dentistry, Seoul, Republic of Korea.
  • 3Department of Periodontology, Dental Research Institute, Seoul National University School of Dentistry, Seoul, Republic of Korea.
  • 4Department of Conservative Dentistry, School of Dentistry, Pusan National University, Yangsan, Republic of Korea.
  • 5Department of Prosthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Republic of Korea.

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.

Keyword

Screw loosening; Reverse torque; Internal connection implant; Internal connection length

MeSH Terms

Joints
Torque
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