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The impact of different cavity design parameters on intraoral scanner accuracy in endocrown restorations
Yunus Emre Ozden1, Idil Ozden2, Zeynep Ozkurt Kayahan1
1Department of Prosthodontics, Faculty of Dentistry, Yeditepe University, Istanbul, Turkey.
Purpose:
To evaluate the effects of different tooth structure thicknesses and cavity depths on the accuracy of intraoral scanners (IOS) in endocrown restorations.
Methods:
A mandibular typodont model was used, with the left mandibular first molar replaced by an extracted real human tooth. Endocrown cavities with varying depths (3.5 mm and 5 mm) and remaining wall thicknesses (1.5 mm and 0.5 mm) were prepared. Master models were scanned using a high-precision extraoral scanner, and the data were exported in STL format. Ten intraoral scans were performed for each group using the TRIOS 3 IOS. Scanning accuracy was analyzed using the Root Mean Square (RMS) value for trueness and the Interquartile Range (IQR) for precision in Geomagic Design X software. The differences in RMS values among the groups were examined using Independent Samples T test and one-way ANOVA test.
Results:
Significant differences in RMS and IQR values were observed between groups with different cavity depths and remaining tooth structure thicknesses (P< 0.001). Groups with thinner remaining tooth structures and deeper cavities exhibited greater deviations, indicating reduced scanning accuracy.
Clinical Significance:
Cavity depth and tooth structure thickness significantly influenced the accuracy of intraoral scanners in endocrown restorations.
