Lopez-Suarez Carlos, Rodriguez Veronica, Pelaez Jesus, Agustin-Panadero Ruben, Suarez Maria J
Department of Buccofacial Prostheses, Faculty of Odontology, University Complutense.
Department of Stomatology, Faculty of Medicine and Dentistry, University of Valencia.
Dent Mater J. 2017 Nov 29;36(6):816-821. doi: 10.4012/dmj.2016-391. Epub 2017 Aug 25.
The purpose of this study was to evaluate and to compare the fracture load and the fracture pattern of monolithic and veneered zirconia posterior fixed dental prostheses (FDPs). Twenty standardized steel dies were prepared to receive posterior 3-unit FDPs. Specimens were randomly divided into 2 groups (n=10): (1) Lava Zirconia, and (2) Lava Plus. All FDPs were cemented using glass ionomer cement and subjected to thermal and mechanical cycling at 5-55ºC with a 30-s dwell time for 120,000 masticatory cycles. All specimens were subjected to a three-point bending test until fracture. Data were statistically analyzed using Student's t test, paired t-test and Weibull statistics (α=0.05). No differences were observed in fracture load between the groups. Veneering ceramic fractured before than framework in veneered zirconia group. The fracture pattern was different. The tested groups demonstrated clinically acceptable fracture load values. Monolithic zirconia solves the chipping problem.
本研究的目的是评估和比较整体式和贴面式氧化锆后牙固定义齿（FDPs）的断裂载荷和断裂模式。制备了20个标准化的钢代型，用于制作后牙3单位FDPs。将标本随机分为2组（n = 10）：（1）Lava氧化锆，和（2）Lava Plus。所有FDPs均使用玻璃离子水门汀粘结，并在5 - 55ºC下进行热循环和机械循环，保持30秒的停留时间，进行120,000次咀嚼循环。所有标本均进行三点弯曲试验直至断裂。使用学生t检验、配对t检验和威布尔统计（α = 0.05）对数据进行统计分析。两组之间在断裂载荷方面未观察到差异。在贴面式氧化锆组中，贴面陶瓷比框架先断裂。断裂模式不同。测试组显示出临床上可接受的断裂载荷值。整体式氧化锆解决了崩瓷问题。
