Comparison of CAD/CAM abutment and prefabricated abutment in Morse taper internal type implant after cyclic loading: Axial displacement, removal torque, and tensile removal force
이유승, 허성주, 곽재영, 김성균,
소속 상세정보
이유승 ( Yi Yu-Seung ) - Seoul National University School of Dentistry Department of Prosthodontics
허성주 ( Heo Seong-Joo ) - Seoul National University School of Dentistry Department of Prosthodontics
곽재영 ( Koak Jai-Young ) - Seoul National University School of Dentistry Department of Prosthodontics
김성균 ( Kim Seong-Kyun ) - Seoul National University School of Dentistry Department of Prosthodontics
Abstract
PURPOSE: The purpose of this study was to compare computer-aided design/computer-aided manufacturing (CAD/CAM) abutment and prefabricated abutment in Morse taper internal connection type implants after cyclic loading.
MATERIALS AND METHODS: The study was conducted with internal type implants of two different manufacturers (Group Os, De). Fourteen assemblies were prepared for each manufacturer group and divided into 2 groups (n=7): prefabricated abutments (Os-P, De-P) and CAD/CAM abutments (Os-C, De-C). The amount of axial displacement and the removal torque values (RTVs) were measured before and after cyclic loading (106 cycles, 3 Hz with 150 N), and the tensile removal force to dislodge the abutments was measured after cyclic loading. A repeated measures ANOVA and a pattern analysis based on the logarithmic regression model were conducted to evaluate the effect of cyclic loading on the axial displacement. The Wilcoxon signed-rank test and the Mann-Whitney test was conducted for comparison of RTV reduction% and tensile removal forces.
RESULTS: There was no significant difference between CAD/CAM abutments and prefabricated abutments in axial displacement and tensile removal force; however, significantly greater RTV reduction% after cyclic loading was observed in CAD/CAM abutments. The correlation among the axial displacement, the RTV, and the tensile removal force was not significant.
CONCLUSION: The use of CAD/CAM abutment did not significantly affect the amount of axial displacement and tensile removal force, but presented a significantly greater removal torque reduction% than prefabricated abutments. The connection stability due to the friction at the abutment-implant interface of CAD/CAM abutments may not be different from prefabricated abutment.
키워드
CAD/CAM abutment; Axial displacement; Removal torque; Tensile removal force; Cyclic loading
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