Cruz-Jiménez Silvia de la, Martínez-Alcaraz Paloma, Flores-Fraile Javier, Agustín-Panadero Rubén, Lobo-Galindo Ana Belén, Carbonell-López Concepción, Zubizarreta-Macho Álvaro
Faculty of Health Sciences, Alfonso X el Sabio University, 28691 Madrid, Spain.
Department of Surgery, Faculty of Medicine, University of Salamanca, 37008 Salamanca, Spain.
J Funct Biomater. 2025 Feb 20;16(3):76. doi: 10.3390/jfb16030076.
The pontic design may influence the load-to-failure performance of fixed implant-supported screw-retained monolithic zirconia prostheses. This study aimed to evaluate the effect of pontic geometry on the fracture resistance of such restorations. Forty restorations were designed using dental CAD software and divided into four groups ( = 10 each): (A) Flat + Wide-pontics with a flat contour, 10 mm in width and 8 mm in height; (B) Concave + Wide-pontics with a concave contour, 10 mm in width and 5.5 mm in height; (C) Flat + Narrow-pontics with a flat contour, 6 mm in width and 8 mm in height; and (D) Concave + Narrow-pontics with a concave contour, 6 mm in width and 5.5 mm in height. All specimens underwent thermal and mechanical cycling, followed by a fracture load test using a three-point bending setup. Maximum fracture loads and displacements were analyzed using one-way ANOVA. Statistically significant differences were observed among the groups for both load to failure ( = 0.001) and displacement ( = 0.002). These findings indicate that pontic geometry significantly influences the fracture resistance and deformation behavior of monolithic zirconia prostheses.
桥体设计可能会影响种植体支持的固定螺丝固位整体式氧化锆修复体的抗破坏性能。本研究旨在评估桥体几何形状对这类修复体抗折性的影响。使用牙科CAD软件设计了40个修复体，并将其分为四组（每组n = 10）：（A）扁平+宽桥体，具有扁平轮廓，宽度为10 mm，高度为8 mm；（B）凹面+宽桥体，具有凹面轮廓，宽度为10 mm，高度为5.5 mm；（C）扁平+窄桥体，具有扁平轮廓，宽度为6 mm，高度为8 mm；以及（D）凹面+窄桥体，具有凹面轮廓，宽度为6 mm，高度为5.5 mm。所有标本均进行热循环和机械循环，然后使用三点弯曲装置进行断裂载荷测试。使用单因素方差分析对最大断裂载荷和位移进行分析。在各组之间，观察到破坏载荷（P = 0.001）和位移（P = 0.002）均存在统计学上的显著差异。这些发现表明，桥体几何形状显著影响整体式氧化锆修复体的抗折性和变形行为。
