Dr. Peng is a pediatric dentist in private practice, Dallas, Texas, USA.
Dr. Chen is a professor, interim chair, and program director of the Advanced Education Program in Pediatric Dentistry, Department of Pediatric Dentistry, Loma Linda University, Loma Linda, Calif., USA.
Pediatr Dent. 2023 Jan 15;45(1):52-59.
The purpose of this study was to compare the wear resistance of stainless steel crowns, (SSCs), zirconia crowns (ZRCs), and nanohybrid crowns (NHCs) using a 3D tomography method.
Prefabricated SSCs, ZRCs, and NHCs (n equals 80) were worn for 400,000 cycles, equivalent to three years of simulated clinical wear, at 50 N and 1.2 Hz using the Leinfelder-Suzuki wear tester. Wear volume, maximum wear depth, and wear surface area were computed using a 3D superimposition method and 2D imaging software. Data were statistically analyzed using one-way analysis of variance with the least significant difference post hoc test (P<0.05).
After a wear simulation of three years, NHCs had a 45 percent failure rate; NHCs also had the greatest wear volume loss (0.71 mm³), maximum wear depth (0.22 mm), and wear surface area (4.45 mm²). SSCs (0.23 mm³ , 0.12 mm, 2.63 mm²) and ZRCs (0.03 mm³ , 0.08 mm, 0.20 mm ²) had less wear volume, area, and depth (P<0.001). ZRCs were the most abrasive to their antagonists (P<0.001). The NHC (against SSC wearing group) had the greatest total wear facet surface area (4.43 mm²).
Stainless steel crowns and zirconia crowns were the most wear-resistant materials. Based on these laboratory findings, in the primary dentition, nanohybrid crowns are not recommended as long-term restorations beyond 12 months (P=0.001).
本研究旨在通过三维断层扫描方法比较不锈钢冠（SSC）、氧化锆冠（ZRC）和纳米复合树脂冠（NHC）的耐磨性。
使用 Leinfelder-Suzuki 磨损试验机，以 50N 和 1.2Hz 的压力，对 80 个预制 SSC、ZRC 和 NHC 进行 40 万次循环磨损，模拟临床 3 年的磨损。采用三维叠加法和二维成像软件计算磨损体积、最大磨损深度和磨损表面积。采用单因素方差分析和最小显著差数法进行统计学分析（P<0.05）。
经过 3 年的磨损模拟，NHC 的失败率为 45%；NHC 的磨损体积损失最大（0.71mm³），最大磨损深度（0.22mm）和磨损表面积（4.45mm²）。SSC（0.23mm³、0.12mm、2.63mm²）和 ZRC（0.03mm³、0.08mm、0.20mm²）的磨损体积、面积和深度较小（P<0.001）。ZRC 对其对颌牙的磨损最严重（P<0.001）。NHC（与 SSC 磨损组相比）的总磨损面表面积最大（4.43mm²）。
不锈钢冠和氧化锆冠是最耐磨的材料。根据这些实验室发现，在乳牙期，纳米复合树脂冠不建议作为 12 个月以上的长期修复体（P=0.001）。
