Abstract
Statement of problem
Clinical guidelines for obtaining accurate scan data during the intraoral scanning
of inlay cavities with various configurations and interproximal distances are lacking.
Purpose
The purpose of this in vitro study was to evaluate the effect of interproximal distance
and cavity type on the accuracy of digital scans for inlay cavities, including proximal
cavities.
Material and methods
Four artificial teeth with 4 types of inlay cavities designed based on the buccolingual
width and gingival level of the proximal box were installed in a mannequin at distances
of 0.6, 0.8, and 1.0 mm from the adjacent teeth. Reference scans of the 4 artificial
teeth were obtained by using a laboratory scanner. The CEREC Primescan AC was used
to acquire digital scan data (each n=10). Standard tessellation language (STL) files
were analyzed with a 3-dimensional analysis software program. The mean deviation values
were measured with a 3-dimensional best-fit alignment method to evaluate the accuracy
of the digital scan data. Statistical analyses were performed by using 2-way ANOVA
and the Bonferroni multiple comparison test (α=.05).
Results
As per the interproximal distance, the 1.0-mm group showed significantly higher trueness
than the 0.6-mm group (P<.05). As the interproximal distance increased, the maximum positive deviation significantly
decreased (P<.05). Maximum negative deviation and precision of the scan data were not significantly
different among the distance groups (P>.05). Cavity type had a significant influence on the trueness and precision of the
scan data (P<.05). In particular, the narrow long cavity type had an adverse effect on the precision
and maximum positive deviation of scan data.
Conclusions
During the intraoral scanning of class II inlay restoration, interproximal distance
and cavity type affected the accuracy of an intraoral scan. As the interproximal distance
increased, the trueness of the acquired digital images increased and the maximum positive
deviation significantly decreased. The narrow long cavity type negatively affected
the mean maximum positive deviation and precision of scan data.
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Article info
Publication history
Published online: March 09, 2021
Footnotes
Supported by Dental Research Institute PNUDH-2020-02, Pusan National University Dental Hospital.
Identification
Copyright
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
