전악의 디지털 인상 채득 시 치과용 모형재가 디지털 모형 정확성에 미치는 영향
The Influence of Different Gypsum Materials on the Accuracy from Complete Arch Digital Impression
2
조회
0
다운로드
9
인용
0
참고문헌
키워드
초록
본 연구는 치과용 모형재 중 4형(type IV)석고와 스캔용(scannable)석고를 이용하여 작업모형을 제작한 후, 치과용백색광 스캐너를 이용하여 3차원 디지털 모형으로 전환한데이터의 계측지점간 거리를 측정하여, 그 결과 값을 토대로 이종의 치과용 석고가 3차원 디지털 모형의 크기재현 시정확성여부를 비교하였다. 본 실험을 통하여 치과용 모형재에 따른 3차원 디지털 모형의 정확도를 확인함으로써 임상적용의 가능성을 평가하였으며, 제한된 조건 하에서 수행된본 연구에서 다음과 같은 결론을 얻었다. 1. 치과용 백색광 스캐너를 사용하여 주 모형과 두 종류의모형재로 제작한 작업모형을 3차원 디지털 모형으로 전환한 후, 선계측의 값을 비교한 결과 전체적인 계측지점에서모두 모형재로 제작된 작업모형이 작게 계측되는 경향을 보였다. 2. 각 모형별 동일한 계측지점의 계측값의 차이가 있는지알아보기 위해 paired t-test의 시행결과, 모든 계측지점에서통계적으로 유의한 차이를 보였다(p＜0.05). 결론적으로 두 가지 석고 모두 통계적으로 적정한 수준의정확성을 나타내지 않았으나, 오차 수준이 선행연구에 비추어 볼 때 임상적으로 수용 가능한 수준이라 생각된다. 전악인상채득을 통한 디지털 모형의 정확성은 검증이 되었으나,스캔용(scannable)석고에 대한 임상 효용성을 판단하기 위해 타 제품과의 성분 분석 비교연구나 실질적인 보철물 제작을 통한 적합도 평가를 통해 CAD/CAM 보철물 제작 시장점을 부각할 수 있는 연구가 뒷받침되어야 할 것으로 사료된다.
Abstract
This study was performed to measure the accuracy of different gypsum materials by a white light dental scanner. A master model with the prepared lower full arch tooth was used. The type IV and scannable stone were used for 20 stone casts (10 casts each) duplicated a master model of mandible. The distance between the reference points were measured and analyzed by the Delcam CopycadⓇ (Delcam Plc, UK) 3D graphic software. The t-student test for paired samples were used for statistical analysis. The mean differences to master model for type IV stone and scannable stone model were 0.29∼0.56 mm, and 0.17∼0.35 mm, respectively. There were statistical differences in dimensional accuracy for full arch impression between the master model and type IV/scannable stone (p＜0.05). Two different gypsum materials showed clinically acceptable accuracies of full arch digital impression produced by them. Besides, in both gypsum materials, the differences to the master model detected appear to provide enough accuracy for clinical application.
참고문헌 (23)
- Tinschert J, "Marginal fit of alumina-and zirconia-based fixed partial dentures produced by a CAD", CAM system, 2001, pp.26, 367~374
- Rekow ED, "High-technology innovations and limitations for restorative dentistry", Dent Clin North Am, 37, pp.513~524 (1993)
- Christensen GJ, "Impressions are changing: deciding on conventional, digital or digital plus in-office milling", J Am Dent Assoc, 140, pp.1301~1304 (2009)
- Beuer F, "Digital dentistry: an overview of recent developments for CAD", CAM generated restorations, 2008, pp.204, 505~511
- May KB, "Precision of fit: the procera all-ceram crown", J Prosthet Dent, 80, pp.394~404 (1993)
- Miyazaki T, "A review of dental CAD", CAM: current status and future perspectives from 20 years of experience, 2009, pp.28, 44~56
- Khalid AA, "The effect of adding a stone base on the accuracy of working casts using different types of dental stones", J Contemp Dent Pract, 7, pp.575~586 (2006)
- Anusavice KJ, "Phillip's science of dental material", pp.621~654 (2003), WB Saunders
- Millstein PL, "Determining the accuracy of gypsum casts made from Type IV dental stone", J Oral Rehabil, 19, pp.239~243 (1992)
- Moser JB, "Properties and characteristics of resin die material", J Prosthet Dent, 34, pp.297~304 (1975)
- Kasier DA, "A study of distortion and surface hardness of improved artifical stone casts", J Prosthet Dent, 36, pp.373~381 (1976)
- Linke BA, "Distortion analysis of stone casts made from impression materials", J Prothet Dent, 54, pp.794~802 (1985)
- Gordon GE, "The effect of tray selection on the accuracy of elastomeric impression materials", J Prothet Dent, 63, pp.12~15 (1990)
- Creed B, "Comparison of the accuracy of linear measurement obtained from cone beam computerized tomography images and digital models", Semin Orthod, 17, pp.49~56 (2011)
- ADA specification No. 25 for Dental Gypsum Products, "Council on dental materials, ANSI", pp.1987, American Dental Association
- Duke PD, "Study of the physical properties of type IV gypsum, resin-containing and epoxy die materials", J Prosthet Dent, 83, pp.466~473 (2000)
- Delong R, "Accuracy of a system for creating 3D computer models of dental arches", J Dent Res, 90, pp.434~440 (2003)
- Christensen GJ, "The state of fixed prosthodontics impressions: room for improvement", J Am Dent Assoc, 136, pp.343~346 (2006)
- Santoro M, "Comparison of measurements made on digital and plaster models", Am J Orthod Dentofacial Orthop, 124, pp.101~105 (2003)
- Stevens DR, "Validity, reliability, and reproducibility of plaster vs digital study models: comparison of peer assessment rating and Bolton analysis and their constituent measurements", Am J Orthod Dentofacial Orthop, 129, pp.794~803 (2006)
- Keating AP, "A comparison of plaster, digital and reconstructed study model accuracy", J Orthod, 35, pp.191~201 (2008)
- Quimby ML, "The accuracy and reliability of measurements made on computer-based digital models", Angle Orthod, 74, pp.298~303 (2004)
- Zilberman O, "Evaluation of the validity of tooth size and arch width measurements using conventional and three-dimensional virtual orthodontic models", Angle Orthod, 73, pp.301~306 (2003)