earticle

영어

Purpose: This study aimed to compare the accuracy of intra-oral and model scanners using structured light scanning technology in the external, internal, and marginal surfaces of a single zirconia crown. Methods: The maxillary right first molar was selected as the abutment tooth, and an impression was taken to create a master model. Each specimen was scanned 10 times using an intra-oral scanner (IOS group; i600, MegaGen Implant) and a model scanner (MS group) (n=20). All scan data were exported and saved in standard tessellation language format. A three-dimensional analysis program was employed to evaluate the root mean square (RMS) deviations across the external, internal, and marginal surfaces. Statistical analysis was performed using IBM SPSS Statistics 26.0 (IBM), with the Shapiro–Wilk test applied for normality and the Mann–Whitney U test (α=0.05). Results: In the trueness analysis, no statistically significant differences were found between the 2 groups for the external and marginal surfaces (p>0.05). However, the MS group demonstrated significantly higher trueness in the internal surface (p=0.008). In the precision analysis, the IOS group showed higher precision on the external surface, whereas the MS group had higher precision on both the internal and marginal surfaces, with significant differences observed across all surfaces (p<0.05). Conclusion: This study revealed that the MS group demonstrated higher trueness and precision in certain areas. Both scanners achieved accuracy within 120 μm, confirming their potential for clinical application.