치과 캐드/캠 시스템으로 제작된 지르코니아 single 코핑과 3-unit 구조물의 상대적 적합도 비교
Comparison of relative fitness between zirconia single coping and 3-unit fixed partial dentures (FPDs) manufactured by dental CAD/CAM system
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
목적: 본 연구의 목적은 동일한 모형에서 제작된 지르코니아 single 코핑과 3-unit 구조물의 변연 및 내면 적합도를 평가하는 것이다. 연구 재료 및 방법: 상악 우측 제2소구치가 상실되고 상악 제1소구치와 제2대구치가 지대치로 형성된 에폭시 모형(epoxy model)을 제작한 후 레이저 스캐너를 이용하여 스캔 하였다. CAD 소프트웨어를 이용하여 지르코니아 구조물을 디자인하고 CAM을 사용하여 지르코니아 single 코핑과 3-unit 구조물을 제작 하였다. 지르코니아 single 코핑은 상악 제1소구치, 제2대구치에서 각각 10개씩 제작 되었고 지르코니아 3-unit 구조물도 10개가 제작 되었다. 적합도 측정을 위하여 제작된 실리콘 복제(silicone replica)를 4등분하고 각 면의 측정 위치(P1, P2, P3, P4, P5)에서 디지털 현미경을 사용하여 적합도를 측정하였다. 각 위치에서 측정된 불일치 값들은 변연 불일치(MG, P1), 축 불일치(AG, P2와 P3의 평균), 교합 불일치(OG, P4와 P5의 평균)의 세 범주로 분류하였다. 결과: Single 코핑에서 변연 불일치의 범위는 18.47 - 40.54 μm, 축 불일치의 범위는 39.73 - 73.61 μm, 교합 불일치의 범위는 116.90 - 134.69 μm이었다. 3-unit 구조물에서 변연 불일치의 범위는 45.95 - 87.44 μm이고, 축 불일치의 범위는 23.78 - 57.00 μm이고, 교합 불일치는 99.89 - 131.06 μm이었다. 결론: 본 연구의 결과에 따르면 single 코핑에 비해 3-unit 구조물의 변연 불일치가 증가하였지만 임상학적 수용 범위(- 120 μm) 내에 있었으며 3-unit 구조물의 불일치 증가를 방지하기 위해서 더욱 균질한 지르코니아 블록 사용과 소결공정들을 조절해야 할 것이다.
Abstract
Purpose: The purpose of this study was to assess the marginal and mesial fitness of zirconia single copings and 3-unit fixed partial dentures (FPDs) manufactured with an identical model. Materials and Methods: An epoxy model in which the maxillary right 2nd premolar is lost and maxillary 1st premolar and 2nd molar are formed as abutments was manufactured and scanned by using a laser scanner. A ten units of zirconia single copings were manufactured for maxillary 1st premolar and 2nd molar, respectively and the same number of 3-unit FPDs were manufactured. For the measurements of fitness, the manufactured silicone replicas were divided into four parts and the fitness were measured by digital microscope at measurement points (P1, P2, P3, P4 and P5) of each plane. The measured gaps were classified into three categories: marginal gap (MG, P1), axial gap (AG, average of P2 and P3), occlusal gap (OG, average of P4 and P5). Results: The ranges of MG, AG and OG for single copings were 18.47 - 40.54 μm, 39.73 - 73.61 μm and 116.90 - 134.69 μm, respectively. The ranges of MG, AG and OG for 3-unit FPDs were 45.95 - 87.44 μm, 23.78 - 57.00 μm and 99.89 - 131.06 μm, respectively. Conclusion: The result of the study shows that the MGs for 3-unit FPDs were higher than those of single copings, though they are within the range of clinical acceptance, indicating that the use of more homogeneous zirconia block and modification of sintering processes are needed to ensure the prevention of increase of gap in 3-unit FPDs.
참고문헌 (22)
- Raigrodski AJ, "The safety and efficacy of anterior ceramic fixed partial dentures: a review of the literature", J Prosthet Dent, 86, pp.520~525 (2001)
- Raigrodski AJ, "Contemporary materials and technologies for all-ceramic fixed partial dentures: review of the literature", J Prosthet Dent, 92, pp.557~562 (2004)
- Miyazaki T, "A review of dental CAD", CAM: current status and future perspectives from 20 years of experience, 2009, pp.28, 44~56
- Filser F, "Reliability and strength of all-ceramic dental restorations fabricated by direct ceramic machining (DCM)", Int J Comput Dent, 4, pp.89~106 (2001)
- Bindl A, "Marginal and internal fit of all ceramic CAD", CAM crown copings on chamfer preparations, 2005, pp.32, 441~447
- Degrange M, "Adhesion: the silent revolution in dentistry", pp.277~301 (2000), Quintessence
- Holmes JR, "Considerations in measurement of marginal fit", J Prosthet Dent, 62, pp.405~408 (1989)
- Kohorst P, "Marginal accuracy of four unit zirconia fixed dental prostheses fabricated using different computer aided design", computer aided manufacturing systems, 2009, pp.117, 319~325
- Reich S, "Clinical fit of four unit zirconia posterior fixed dental prostheses", Eur J Oral Sci, 116, pp.579~584 (2008)
- Reich S, "Clinical fit of all ceramic three unit fixed partial dentures, generated with three different CAD", CAM systems, 2005, pp.113, 174~179
- Wettstein F, "Clinical study of the internal gaps of zirconia and metal frameworks for fixed partial dentures", Eur J Oral Sci, 116, pp.272~279 (2008)
- Tinschert J, "Marginal fit of alumina-and zirconiabased fixed partial dentures produced by a CAD", CAM system, 2001, pp.26, 367~374
- Coli P, "Fit of a new pressure-sintered zirconium dioxide coping", Int J Prosthodont, 17, pp.59~64 (2004)
- Kokubo Y, "Clinical marginal and internal gaps of Procera AllCeram crowns", J Oral Rehabil, 32, pp.526~530 (2005)
- Grenade C, "Fit of single tooth zirconia copings: comparison between various manufacturing processes", J Prosthet Dent, 105, pp.249~255 (2011)
- Bindl A, "Fit of all-ceramic posterior fixed partial denture frameworks in vitro", Int J Periodontics Restorative Dent, 27, pp.567~575 (2007)
- Beuer F, "Marginal and internal fits of fixed dental prostheses zirconia retainers", Dent Mater, 25, pp.94~102 (2009)
- Kunii J, "Effect of sintering on the marginal and internal fit of CAD", CAM-fabricated zirconia frameworks, 2007, pp.26, 820~826
- Beuer F, "Precision of fit: zirconia three-unit fixed dental prostheses", Clin Oral Investig, 13, pp.343~349 (2009)
- Gonzalo E, "Marginal fit of Zirconia posterior fixed partial dentures", Int J Prosthodont, 21, pp.398~399 (2008)
- Coli P, "Precision of a CAD", CAM technique for the production of zirconium dioxide copings, 2004, pp.17, 577~580
- McLean JW, "The estimation of cement film thickness by an in vivo technique", Br Dent J, 131, pp.107~111 (1971)