J Adv Prosthodont.  2014 Jun;6(3):185-193. 10.4047/jap.2014.6.3.185.

The reliability of an easy measuring method for abutment convergence angle with a computer-aided design (CAD) system

Affiliations
  • 1Department of Prosthodontics, Seoul National University School of Dentistry, Seoul, Republic of Korea. pros53@snu.ac.kr
  • 2Department of Dentistry, St. Catholic Hospital, Catholic University of Korea, Suwon, Republic of Korea.

Abstract

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.

Keyword

Computer-aided design; Convergence angle; Prosthodontic tooth preparation; Validation studies; Dental abutments
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