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KMID : 1023820140060030185
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The Journal of Advanced Prosthodontics
2014 Volume.6 No. 3 p.185 ~ p.193
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The reliability of an easy measuring method for abutment convergence angle with a computer-aided design (CAD) system
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Seo Yong-Joon
Hongxuan Quan
Kwon Taek-Ka
Han Jung-Suk
Lee Jai-Bong
Kim Sung-Hun
Yeo In-Sung
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Abstract
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PURPOSE : The purpose of this study was to evaluate the intra-rater reliability and inter-rater reliability of three different methods using a drawing protractor, a digital protractor after tracing, and a CAD system.
MATERIALS AND METHODS : Twenty-four artificial abutments that had been prepared by dental students were used in this study. Three dental students measured the convergence angles by each method three times. Bland-Altman plots were applied to examine the overall reliability by comparing the traditional tracing method with a new method using the CAD system. Intraclass Correlation Coefficients (ICC) evaluated intra-rater reliability and inter-rater reliability.
RESULTS : All three methods exhibited high intra-rater and inter-rater reliability (ICC>0.80, P<.05). Measurements with the CAD system showed the highest intra-rater reliability. In addition, it showed improved inter-rater reliability compared with the traditional tracing methods.
CONCLUSION : Based on the results of this study, the CAD system may be an easy and reliable tool for measuring the abutment convergence angle.
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KEYWORD
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Computer-aided design, Convergence angle, Prosthodontic tooth preparation, Validation studies, Dental abutments
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