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J Prosthet Dent. 2018 Apr;119(4):600-605. doi: 10.1016/j.prosdent.2017.05.022. Epub 2017 Aug 4.

Effects of image and education on the precision of the measurement method for evaluating prosthesis misfit.

Author information

1
Graduate student, Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea.
2
Associate Professor, Department of Statistics, Kyungpook National University, Daegu, Republic of Korea.
3
Associate Professor, Department of Conservative Dentistry, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea.
4
Assistant Professor, Department of Prosthodontics, School of Dentistry, A3DI, Kyungpook National University, Daegu, Republic of Korea. Electronic address: deweylee@knu.ac.kr.

Abstract

STATEMENT OF PROBLEM:

Various methods for measuring prosthesis misfit have been suggested. Although the cross-sectional images between the crown and abutment are used to evaluate the misfit, the effects of the image and the observer's knowledge on the precision of measurement are unknown.

PURPOSE:

The purpose of this in vitro study was to investigate the effects of the image and of education on the precision of prosthesis misfit measurement methods using inter- and intraobserver variability analyses.

MATERIAL AND METHODS:

The cross-sectional images in the margin were obtained using the computer-aided replica technique (CART), silicone replica technique (RT), and sectioning technique (ST). Twenty-five observers measured the absolute marginal discrepancy values in the images obtained from each group 4 times at an interval of 2 weeks; the observers went through different education sessions regarding the selection of the measurement points. The precision of measurement was determined and compared using the likelihood-ratio test statistic (α=.05) and the intraclass correlation coefficient with the linear mixed-effects model.

RESULTS:

The CART group exhibited the smallest deviations in the measurement variations, followed by the ST and RT groups (P<.001). Additional education on misfit measurements generally decreased the deviation values in all the groups, but without any significant differences.

CONCLUSIONS:

The cross-sectional image obtained from the measurement methods and education on the evaluation method affected the precision of the prosthesis misfit measurement. Digital methods might be a useful tool to significantly enhance the precision of the measurements.

PMID:
28781069
DOI:
10.1016/j.prosdent.2017.05.022
[Indexed for MEDLINE]

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