与具有两种肩台厚度的部分结晶二硅酸锂相比，由完全结晶二硅酸锂制成的后牙CAD/CAM全冠的内部适合性和边缘适应性：一项研究。
Internal Fit and Marginal Adaptation of Posterior CAD/CAM Crowns Fabricated from Fully Crystallized Lithium Disilicate Compared to Partially Crystallized Lithium Disilicate with Two Finish Line Thicknesses: An Study.
作者信息
ElGendy Menna, Sherif Rana, Rabie Karim
机构信息
Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University; Department of Fixed Prosthodontics, Faculty of Oral and Dental Medicine, Egyptian Russian University, Cairo, Egypt, Phone: +0021093302027, e-mail:
Department of Fixed Prosthodontics, Cairo University, Cairo, Egypt, ORCID: https://orcid.org/0000-0003-3033-4100.
出版信息
J Contemp Dent Pract. 2024 Aug 1;25(8):740-744. doi: 10.5005/jp-journals-10024-3744.
AIM
This study aimed to evaluate internal fit and marginal adaptation of posterior CAD/CAM crowns fabricated from partially crystallized lithium disilicate and fully crystallized lithium disilicate with two finish line thicknesses (0.5 mm chamfer and 1 mm round shoulder).
METHODOLOGY
In this study, 20 sound extracted human molar teeth were collected. The teeth were prepared using a dental surveyor. Teeth were divided into main groups: Group I partially crystallized e.max CAD (Em) and Group II fully crystallized Initial LiSi (Li). Each group was subdivided according to finish line thicknesses into 0.5 mm chamfer and 1 mm round shoulder finish lines. All samples were tested for internal fit by triple scanning technique and the marginal adaptation was measured by stereomicroscope before cementation.
RESULTS
The results showed that the finish line thicknesses (0.5 mm chamfer,1 mm round shoulder) had no statistically significant effect on mean internal fit ( = 0.954). Ceramic types: Em and Li had no statistically significant effect on mean internal fit ( = 0.902). Regarding the marginal adaptation, Em showed statistically significantly higher mean marginal gap distance than Li ( < 0.001).
CONCLUSION
The finish line thicknesses did not affect the internal fit or marginal adaptation values. Ceramic types did not affect the internal fit values. The marginal adaptation of Em was lower than Li.
CLINICAL SIGNIFICANCE
GC Initial Lisi produced comparable results to the gold standard IPS e.max CAD, thus it can be used due to its clinically acceptable internal fit and marginal adaptation. How to cite this article: ElGendy M, Sherif R, Rabie K. Internal Fit and Marginal Adaptation of Posterior CAD/CAM Crowns Fabricated from Fully Crystallized Lithium Disilicate Compared to Partially Crystallized Lithium Disilicate with Two Finish Line Thicknesses: An Study. J Contemp Dent Pract 2024;25(8):740-744.
目的
本研究旨在评估由部分结晶的二硅酸锂和完全结晶的二硅酸锂制成的后牙CAD/CAM全冠，在两种肩台厚度（0.5mm 45°肩台和1mm圆钝肩台）下的内部适合性和边缘适合性。
方法
本研究收集了20颗完好的拔除人类磨牙。使用牙用测绘仪对牙齿进行预备。牙齿被分为主要组：第I组为部分结晶的e.max CAD（Em），第II组为完全结晶的初代硅酸锂（Li）。每组再根据肩台厚度细分为0.5mm 45°肩台和1mm圆钝肩台。所有样本在粘结前通过三重扫描技术测试内部适合性，并通过体视显微镜测量边缘适合性。
结果
结果显示，肩台厚度（0.5mm 45°肩台、1mm圆钝肩台）对平均内部适合性没有统计学显著影响（P = 0.954）。陶瓷类型：Em和Li对平均内部适合性没有统计学显著影响（P = 0.902）。关于边缘适合性，Em显示出比Li在统计学上显著更高的平均边缘间隙距离（P < 0.001）。
结论
肩台厚度不影响内部适合性或边缘适合性值。陶瓷类型不影响内部适合性值。Em的边缘适合性低于Li。
临床意义
GC初代硅酸锂产生了与金标准IPS e.max CAD相当的结果，因此由于其临床上可接受的内部适合性和边缘适合性，它可以被使用。如何引用本文：ElGendy M, Sherif R, Rabie K. 与具有两种肩台厚度的部分结晶二硅酸锂相比，完全结晶二硅酸锂制成的后牙CAD/CAM全冠的内部适合性和边缘适合性：一项研究。当代牙科实践杂志2024；25(8):740 - 744。
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