Alwazzan Khalid A, Almotairi Adeeb M, Alwazzan Abdullah K, Albesher Faisal A, Tawhari Feras E, Alhumizi Nawaf A
Prosthetic Dental Science Department, College of Dentistry, King Saud University, P.O. Box , 60169, Riyadh, 11545, Kingdom of Saudi Arabia.
College of Dentistry, King Saud University, P.O. Box 60169, Riyadh, 11545, Kingdom of Saudi Arabia.
Saudi Dent J. 2025 May 31;37(4-6):9. doi: 10.1007/s44445-025-00015-0.
Marginal adaptation is a crucial determinant of dental restoration success, directly influencing longevity and clinical outcomes. This study investigated the impact of fitting procedures on the marginal adaptation of CAD/CAM-fabricated all-ceramic crowns. Eight extracted human molars were prepared for crown fabrication using standardized techniques. An impression was carried out for each specimen and poured with type IV dental stone, followed by the CAD/CAM-based design and fabrication of the crowns. Marginal gaps were measured at eight designated points on each specimen using a Hirox Digital Microscope, both before and after fitting procedures. Findings revealed a significant reduction in marginal gaps post-adjustment, with values ranging from 270.55 μm to 9.64 μm before the fitting procedure and 124.4 μm to 3.81 μm after fitting procedures. These results emphasize the efficacy and importance of fitting procedures in enhancing marginal fit, reducing gaps to clinically acceptable levels, and minimizing potential complications such as microleakage and secondary caries. The study highlights the critical role of fitting procedures in optimizing the marginal fit of CAD/CAM crowns, thereby improving their clinical performance and longevity.
边缘适合性是牙齿修复成功的关键决定因素，直接影响修复体的使用寿命和临床效果。本研究调查了试戴程序对计算机辅助设计/计算机辅助制造（CAD/CAM）全瓷冠边缘适合性的影响。使用标准化技术对八颗拔除的人磨牙进行牙冠制作预备。对每个标本进行印模并灌注IV型牙科石膏，然后基于CAD/CAM进行牙冠的设计和制作。使用Hirox数码显微镜在每个标本上的八个指定点测量试戴程序前后的边缘间隙。结果显示调整后边缘间隙显著减小，试戴程序前的值在270.55μm至9.64μm之间，试戴程序后在124.4μm至3.81μm之间。这些结果强调了试戴程序在提高边缘适合性、将间隙减小到临床可接受水平以及最小化微渗漏和继发龋等潜在并发症方面的有效性和重要性。该研究突出了试戴程序在优化CAD/CAM牙冠边缘适合性方面的关键作用，从而改善其临床性能和使用寿命。
