목적: 연구의 목적은 동일한 지대치에서 각각 모델스캔 방법과 구강 내 스캔 방법으로 제작된 지르코니아 보철물의 변연 및 내면적합도를 비교하는 것이다. 재료 및 방법: 발거된 사람의 하악 제1대구치 20개에 대해 지르코니아 보철물을 위한 지대치 형성이 이루어졌다. 첫 번째 그룹에서는 모델 스캔법으로 10개의 지대치를 스캔하였고, 두 번째 그룹에서는 나머지 10개에 대해 구강 내 스캔법을 사용하였다. 각각의 데이터들은 소프트웨어 시스템으로 전송되었고 Ceramill CAD/CAM system을 이용하여 20개의 지르코니아 보철물을 제작하였다. 먼저 weight technique을 사용하여 내면 적합도를 평가하였다. 다음으로 replica technique에서는 광학현미경을 통해 변연 적합도를 평가하였다. 통계처리는 일원배치분산분석을 이용하였다. 결과: 먼저 weight technique에서 모델 스캔법으로 제작한 그룹에서 구강 내 스캔법으로 제작한 그룹에 비해 평균적인 무게 값이 낮게 나타났고, 이는 유의성이 있었다(P < .05). 또한, replica technique에서도 측정된 5개의 영역 모두에서 구강 내 스캔법으로 제작한 그룹에 비해 모델 스캔법으로 제작한 그룹에서 변연 및 내면의 gap에 대한 거리 값이 유의하게 낮게 나타났다(P < .05). 결론: 두 그룹의 방법으로 제작한 지르코니아 보철물은 모두 임상적으로 받아들여질 만한 변연 및 내면 적합성을 보였다. 하지만 모델 스캔법으로 제작한 그룹에서 구강 내 스캔법으로 제작한 그룹에 비해 높은 변연 및 내면 적합성을 보였다.
목적: 연구의 목적은 동일한 지대치에서 각각 모델스캔 방법과 구강 내 스캔 방법으로 제작된 지르코니아 보철물의 변연 및 내면적합도를 비교하는 것이다. 재료 및 방법: 발거된 사람의 하악 제1대구치 20개에 대해 지르코니아 보철물을 위한 지대치 형성이 이루어졌다. 첫 번째 그룹에서는 모델 스캔법으로 10개의 지대치를 스캔하였고, 두 번째 그룹에서는 나머지 10개에 대해 구강 내 스캔법을 사용하였다. 각각의 데이터들은 소프트웨어 시스템으로 전송되었고 Ceramill CAD/CAM system을 이용하여 20개의 지르코니아 보철물을 제작하였다. 먼저 weight technique을 사용하여 내면 적합도를 평가하였다. 다음으로 replica technique에서는 광학현미경을 통해 변연 적합도를 평가하였다. 통계처리는 일원배치분산분석을 이용하였다. 결과: 먼저 weight technique에서 모델 스캔법으로 제작한 그룹에서 구강 내 스캔법으로 제작한 그룹에 비해 평균적인 무게 값이 낮게 나타났고, 이는 유의성이 있었다(P < .05). 또한, replica technique에서도 측정된 5개의 영역 모두에서 구강 내 스캔법으로 제작한 그룹에 비해 모델 스캔법으로 제작한 그룹에서 변연 및 내면의 gap에 대한 거리 값이 유의하게 낮게 나타났다(P < .05). 결론: 두 그룹의 방법으로 제작한 지르코니아 보철물은 모두 임상적으로 받아들여질 만한 변연 및 내면 적합성을 보였다. 하지만 모델 스캔법으로 제작한 그룹에서 구강 내 스캔법으로 제작한 그룹에 비해 높은 변연 및 내면 적합성을 보였다.
Purpose: This research was conducted to compare the marginal and internal fit of zirconia prostheses fabricated with the model scan method and the intraoral scan method. Materials and methods: In this study, 20 extracted human mandibular first molar was used in the preparation of abutment tooth for ...
Purpose: This research was conducted to compare the marginal and internal fit of zirconia prostheses fabricated with the model scan method and the intraoral scan method. Materials and methods: In this study, 20 extracted human mandibular first molar was used in the preparation of abutment tooth for the fabrication of zirconia prostheses. In the first group, the model scan method was applied on 10 prepared teeth. In the other group, the intraoral scan method was used on other 10 prepared teeth. Datum of both groups were transmitted to the software system. Afterwards, 20 zirconia prostheses were fabricated using the Ceramill system. Weight technique was used to evaluate the internal gap of the zirconia prostheses. In the Replica technique, marginal gap of the zirconia prostheses were analyzed by optical microscopy. Statistical analysis was based on one-way ANOVA. Results: Model scan group showed lower average weight than intraoral scan group when weight technique was applied, which has significance (P < .05). Also, model scan group showed significantly lower figures in all 5 measurements of replica technique than intraoral scan group (P < .05). Conclusion: Zirconia prostheses of both groups demonstrated clinically acceptable margin and internal fit. However, model scanned zirconia prostheses showed higher marginal and internal fit than intraoral scanned crowns.
Purpose: This research was conducted to compare the marginal and internal fit of zirconia prostheses fabricated with the model scan method and the intraoral scan method. Materials and methods: In this study, 20 extracted human mandibular first molar was used in the preparation of abutment tooth for the fabrication of zirconia prostheses. In the first group, the model scan method was applied on 10 prepared teeth. In the other group, the intraoral scan method was used on other 10 prepared teeth. Datum of both groups were transmitted to the software system. Afterwards, 20 zirconia prostheses were fabricated using the Ceramill system. Weight technique was used to evaluate the internal gap of the zirconia prostheses. In the Replica technique, marginal gap of the zirconia prostheses were analyzed by optical microscopy. Statistical analysis was based on one-way ANOVA. Results: Model scan group showed lower average weight than intraoral scan group when weight technique was applied, which has significance (P < .05). Also, model scan group showed significantly lower figures in all 5 measurements of replica technique than intraoral scan group (P < .05). Conclusion: Zirconia prostheses of both groups demonstrated clinically acceptable margin and internal fit. However, model scanned zirconia prostheses showed higher marginal and internal fit than intraoral scanned crowns.
* AI 자동 식별 결과로 적합하지 않은 문장이 있을 수 있으니, 이용에 유의하시기 바랍니다.
문제 정의
The aim of this study was to compare the marginal and internal fit of zirconia prostheses fabricated using different scan methods: intraoral scan and model scan. Internal fit was evaluated by weighing light-body silicone impression material and the cement thickness of the crowns on prepared abutment teeth was measured to evaluate the marginal and internal fits.
제안 방법
Extracted human mandibular first molars were used in this study. For preparation of the abutment tooth, a preparation design with a 1 mm-wide, pronounced chamfer, free of any irregularities, with a 90-degree cavosurface angle around the circumference of the tooth, a total occlusal convergence of 6 degrees, and an occlusal reduction of 2.0 mm at the center of the occlusal surface was executed. An axial surface height of 7 mm was maintained on all surfaces (Fig.
The RT was used to measure the marginal and internal fitting accuracy. Light-body silicone impression material of very low viscosity (Aquasil Ultra XLV) was applied to the crown interior, after which the crown was set onto the prepared abutment tooth with finger pressure in the occlusal direction.
7). The bisected replicas were then measured and photographed using a stereoscopic microscope with surface illumination (MZ-16FA, Leica Microsystems, Wetzlar, Germany) by using a Leica microscope software at 5 pre-determined points on the buccal and lingual margins, buccal and lingual axial walls and occlusal area (Fig. 8). The horizontal marginal discrepancy (x), the vertical marginal discrepancy (y), the absolute marginal discrepancy (a), and the internal gap (b) were evaluated (Fig.
There are few studies comparing the adaptation of zirconia prostheses fabricated with the two different scan methods mentioned above; furthermore, there is no clear evidence that one method of fabrication provides a consistently superior fit. Therefore, the purpose of this study was to evaluate the fit of zirconia prostheses fabricated with the model scan method and the intraoral scan method. The weight technique (WT) and replica technique (RT) were used to evaluate the internal and marginal fit.
데이터처리
Means ± SD value of silicone weight measurements for the intraoral scan group and model scan group (n = 10, for each), with independent t test results.
Levene's test was performed to evaluate the equality of variances. One-way analysis of variance (ANOVA) was used to assess the influence of the impression methods on the marginal and internal gaps. The level of significance was established as 0.
성능/효과
This study proved that zirconia prostheses fabricated with two different scan methods have clinically acceptable marginal and internal gap thicknesses. In addition, zirconia prostheses fabricated with the model scan method had significantly lower marginal and internal gaps than did those fabricated with the intraoral scan method.
참고문헌 (34)
Conrad HJ, Seong WJ, Pesun IJ. Current ceramic materials and systems with clinical recommendations: a systematic review. J Prosthet Dent 2007;98:389-404.
Holden JE, Goldstein GR, Hittelman EL, Clark EA. Comparison of the marginal fit of pressable ceramic to metal ceramic restorations. J Prosthodont 2009;18:645-8.
Quintas AF, Oliveira F, Bottino MA. Vertical marginal discrepancy of ceramic copings with different ceramic materials, finish lines, and luting agents: an in vitro evaluation. J Prosthet Dent 2004;92:250-7.
Tan PL, Gratton DG, Diaz-Arnold AM, Holmes DC. An in vitro comparison of vertical marginal gaps of CAD/CAM titanium and conventional cast restorations. J Prosthodont 2008;17:378-83.
Kohorst P, Brinkmann H, Dittmer MP, Borchers L, Stiesch M. Influence of the veneering process on the marginal fit of zirconia fixed dental prostheses. J Oral Rehabil 2010;37:283-91.
Wolfart S, Wegner SM, Al-Halabi A, Kern M. Clinical evaluation of marginal fit of a new experimental all-ceramic system before and after cementation. Int J Prosthodont 2003;16:587-92.
Fonseca JC, Henriques GE, Sobrinho LC, de Go'es MF. Stressrelieving and porcelain firing cycle influence on marginal fit of commercially pure titanium and titanium-aluminum-vanadium copings. Dent Mater 2003;19:686-91.
Wettstein F, Sailer I, Roos M, Hammerle CH. Clinical study of the internal gaps of zirconia and metal frameworks for fixed partial dentures. Eur J Oral Sci 2008;116:272-9.
Gonzalo E, Sua'rez MJ, Serrano B, Lozano JF. A comparison of the marginal vertical discrepancies of zirconium and metal ceramic posterior fixed dental prostheses before and after cementation. J Prosthet Dent 2009;102:378-84.
Valderrama S, Van Roekel N, Andersson M, Goodacre CJ, Munoz CA. A comparison of the marginal and internal adaptation of titanium and gold-platinum-palladium metal ceramic crowns. Int J Prosthodont 1995;8:29-37.
Baig MR, Tan KB, Nicholls JI. Evaluation of the marginal fit of a zirconia ceramic computer-aided machined (CAM) crown system. J Prosthet Dent 2010;104:216-27.
Reich S, Wichmann M, Nkenke E, Proeschel P. Clinical fit of allceramic three-unit fixed partial dentures, generated with three different CAD/CAM systems. Eur J Oral Sci 2005;113:174-9.
Castillo de Oyague R, Sa'nchez-Jorge MI, Sa'nchez Turrio'n A, Monticelli F, Toledano M, Osorio R. Influence of CAM vs. CAD/CAM scanning methods and finish line of tooth preparation in the vertical misfit of zirconia bridge structures. Am J Dent 2009;22:79-83.
Flugge TV, Schlager S, Nelson K, Nahles S, Metzger MC. Precision of intraoral digital dental impressions with iTero and extraoral digitization with the iTero and a model scanner. Am J Orthod Dentofacial Orthop 2013;144:471-8.
Vojdani M, Torabi K, Farjood E, Khaledi A. Comparison the marginal and internal fit of metal copings cast from wax patterns fabricated by CAD/CAM and conventional wax up techniques. J Dent (Shiraz) 2013;14:118-29.
McLean JW, von Fraunhofer JA. The estimation of cement film thickness by an in vivo technique. Br Dent J 1971;131:107-11.
Moldovan O, Rudolph H, Quaas S, Bornemann G, Luthardt RG. Internal and external fit of CAM-made zirconia bridge frameworksa pilot study. Dtsch Zahnarztl Z 2006;61:38-42.
Kokubo Y, Nagayama Y, Tsumita M, Ohkubo C, Fukushima S, Vult von Steyern P. Clinical marginal and internal gaps of In-Ceram crowns fabricated using the GN-I system. J Oral Rehabil 2005;32:753-8.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.