PURPOSE@#The purpose of this study was to compare the degree of
tooth preparation abilities of
students according to three
self-assessment methods.@*MATERIALS AND
METHODS@#forty-eight sophomores in Kyungpook National
University College of
Dentistry were divided into three experimental groups.
Students performed
tooth preparation of the left mandibular first
molar for full
gold crown. They performed
self-assessment using the three
methods (visual, digital, and putty index
self-assessment group), and reperformed
tooth preparation. An intraoral scanner was used to scan each
tooth model (prepared
tooth and unprepared
tooth), and data were acquired in standard tessellation
language (STL) file format. The STL files of prepared
tooth and unprepared
tooth were superimposed using the 3-dimensional
analysis software (Geomagic control X). And the reduction amount was measured. In the
statistical analysis, all values of reduction amount were analyzed with the Wilcoxon signed rank test and Kruskal-Wallis test (α = 0.05).@*RESULTS@#The three
self-assessment methods showed statistically significant differences (P < 0.001). The putty index
self-assessment group showed the highest reduction in error than the digital
self-assessment method.@*CONCLUSION@#Within limitations of this study,
students showed significant differences in improvement of
tooth preparation ability according to the three
self-evaluation methods.