J Korean Acad Prosthodont.  2007 Jun;45(3):345-353.

A study of the effect of an anti-rotational inner post screw systems on abutment screw loosening for single implant : Part 1

• Choi SY
• Lee JB

Abstract

STATEMENT OF PROBLEM: Implant abutment screw joints tend to loosen under clinical conditions. Abutment screw loosening results in loss of preload in function. PURPOSE: Anti-rotational inner post screw (ARIPS) systems were compared with conventional abutment screws to reduce screw loosening. Reverse torque values were evaluated. MATERIAL AND METHODS: 32 implant assemblies (Warentec, Co, Ltd, Seoul, Korea) were organized as the 30-Ncm-torque conventional groups and 30-Ncm-torque ARIPS groups in external and internal system. The specimens were tested to 10(6) cycles at a load of 200N. Preload reverse torque, postload reverse torque, and the ratio of postload reverse torque to preload reverse torque were evaluated. The data were analyzed with unpaired t-test in external and internal systems.
RESULTS
In the ratio of postload reverse torque to preload reverse torque, the ARIPS groups showed significant differences than the conventional screw group in both external and internal system.
CONCLUSION
Within the limitations of this study, abutment screw loosening was effectively reduced using ARIPS system.

Keyword

Dental implant; Abutment screw loosening; Anti-rotational inner post screw (ARIPS) system; Reverse torque values

MeSH Terms

Dental Implants
Joints
Seoul
Torque
Dental Implants