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비접촉식 구강외 스캐너와 비디오방식 구강내 스캐너를 이용하여 제작된 보철물의 내면정확도 비교

Comparison of the Internal Fitness of Prostheses Fabricated with Non-Contact Extra-Oral Scanner and Intra-Oral Video Scanner

대한치과기공학회지 2019년 41권 4호 p.263 ~ 269
박진영 ( Park Jin-Young ) - 고려대학교 보건과학대학 보건과학연구소

김지환 ( Kim Ji-Hwan ) - 고려대학교 대학원 보건과학과
정일도 ( Jung In-Do ) - 고려대학교 보건과학대학 보건과학연구소
이광영 ( Lee Gwang-Young ) - 원광보건대학교 치기공과
김원수 ( Kim Won-Soo ) - 대전보건대학교 치기공과

Abstract


Purpose: The purpose of this study was to evaluate the internal fitness of prostheses fabricated with non-contact extra-oral scanner and those fabricated with intra-oral video scanner, with a comparative accuracy analyses of their precision and trueness.

Methods: A polymethyl methacrylate (PMMA) model was fabricated by replicating a master model. The prostheses in the first group were fabricated based on the PMMA model with an intra-oral video scanner (IVS group). Following the fabrication of work models with Type IV Stone that were based on the PMMA model, the prostheses in the second group were fabricated with a non-contact extra-oral scanner (ENB group). The precision and trueness of the prostheses were calculated from comparisons of the three-dimensional images of the internal surfaces of the prostheses and those of the master model. Kruskal-Wallis tests were used to determine the statistical significance, with the level of type 1 error set at 0.05.

Results: Trueness (P < 0.009) and precision (P < 0.001) did not differ significantly between the ENB and IVS groups. The IVS group exhibited lower trueness values and larger precision values than the ENB group.

Conclusion: Although no significant differences were found in the internal fitness of the prostheses that were fabricated by the two different scanners, the intraoral video scanner-fabricated prostheses had better trueness, whereas the non-contact extra-oral scanner-fabricated prostheses had better precision.

키워드

Accuracy; CAD/CAM; Color-difference map; Precision; Three-dimensional analysis; Trueness
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