구강 내 스캐너와 구강 외 스캐너를 사용하여 취득된 스캔 데이터 정확도 비교

Abstract

Purpose: The purpose of this study was to compare the accuracy of the scan data acquired by the extra-oral and intra-oral scanner. Methods: The maxillary right first molar was made of polymethyl methacrylate (PMMA)specimen. This PMMA specimen was scanned with a engineering scanner and intra-oral scanner. Meanwhile, extra-oral scanner scanned stone die duplicated from PMMA master die. Trueness and precision of scan datas was measuredby3-dimensinal inspection. Independent t-test was conduct to analysis the significant difference.(a=0.05) Results: In the trueness analysis, mean of discrepancies were13.82um for intra oral scanner and16.84 um for extra-oral scanner. In the precision analysis, mean of discrepancies were 11.72 for inta-oral scanner and 9.2 for extra-oral scanner. Both trueness and precision showed a statistically significant difference (Table 1, p<0.05). Conclusion: Intra-oral scanner can show higher trueness than extra-oral scanner, it has lower precision.