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KMID : 1023820170090050358
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The Journal of Advanced Prosthodontics
2017 Volume.9 No. 5 p.358 ~ p.363
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Verification of a computer-aided replica technique for evaluating prosthesis adaptation using statistical agreement analysis
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Mai Hang Nga
Lee Kyeong-Eun
Lee Kyu-Bok
Jeong Seung-Mi
Lee Seok-Jae
Lee Cheong-Hee
An Seo-Young
Lee Du-Hyeong
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Abstract
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PURPOSE: The purpose of this study was to evaluate the reliability of computer-aided replica technique (CART) by calculating its agreement with the replica technique (RT), using statistical agreement analysis.
MATERIALS AND METHODS: A prepared metal die and a metal crown were fabricated. The gap between the restoration and abutment was replicated using silicone indicator paste (n = 25). Gap measurements differed in the control (RT) and experimental (CART) groups. In the RT group, the silicone replica was manually sectioned, and the marginal and occlusal gaps were measured using a microscope. In the CART group, the gap was digitized using optical scanning and image superimposition, and the gaps were measured using a software program. The agreement between the measurement techniques was evaluated by using the 95% Bland-Altman limits of agreement and concordance correlation coefficients (CCC). The least acceptable CCC was 0.90.
RESULTS: The RT and CART groups showed linear association, with a strong positive correlation in gap measurements, but without significant differences. The 95% limits of agreement between the paired gap measurements were 3.84% and 7.08% of the mean. The lower 95% confidence limits of CCC were 0.9676 and 0.9188 for the marginal and occlusal gap measurements, respectively, and the values were greater than the allowed limit.
CONCLUSION: The CART is a reliable digital approach for evaluating the fit accuracy of fixed dental prostheses.
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KEYWORD
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Computer-aided replica technique, Concordance correlation coefficient analysis, Prosthesis adaptation, Reliability, Verification, Silicone replica technique
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