Harb Osama, Al-Zordk Walid, Özcan Mutlu, Sakrana Amal Abdelsamad
Fixed Prosthodontics Department, Faculty of Dentistry, Mansoura and Horus University, Mansoura 35511, Egypt.
Center for Dental and Oral Medicine, Division of Dental Biomaterials, Clinic for Reconstructive Dentistry, University of Zurich, 8032 Zurich, Switzerland.
Materials (Basel). 2021 Feb 18;14(4):960. doi: 10.3390/ma14040960.
The aim of this study was to test the impact of hot acids etching and two types of adhesive cement on the retention of zirconia crowns.
Forty maxillary premolars were prepared, and zirconia crowns were designed and fabricated with proximal extensions, then divided into 4 groups (n = 10). Group AP; the crowns were air-abraded and cemented using Panavia SA Cement. Group AL; the crowns were air- abraded and cemented using GC LinkForce. Group AHP; the crowns were air-abraded, etched with the hot acids (48% hydrofluoric acid and 69% nitric acid), and cemented using Panavia SA Cement. Group AHL; the crowns were air-abraded, etched with the hot acids, and cemented using GC LinkForce. Each zirconia crown was pre-treated and bonded to its corresponding tooth. After thermocycling (5-55 °C/10,000), the retention test was performed and the load required to dislodge the crown was reported in Newton (N), and mode of failure was recorded. The retention strength (MPa) was calculated for each tested variable and statistically analyzed.
Group AHP showed the highest mean value of the retention strength, followed by group AP then group AHL. Group AL showed the lowest value. A statistically significant effect ( = 0.001) of the hot acids etching on the retention of zirconia crown was found. Also, there was a significant effect ( = 0.000) of the cement type. The interaction between surface treatment and the cement type has no significant impact ( = 0.882). The main mode of failure for Panavia SA Cement is mixed mode of failure, while for G-CEM LinkForce is adhesive failure. : Hot acid etching pre-treatment improved the retention of zirconia crown. Usage of Panavia SA Cement with hot acids etching is effective can be used for adhesive cementation of zirconia crown.
本研究旨在测试热酸蚀刻和两种类型的粘结剂对氧化锆全冠固位力的影响。
制备40颗上颌前磨牙，设计并制作带有近中延伸部的氧化锆全冠，然后分为4组（n = 10）。AP组；全冠经空气喷砂处理后用帕纳维亚SA粘结剂粘结。AL组；全冠经空气喷砂处理后用GC LinkForce粘结剂粘结。AHP组；全冠经空气喷砂处理后用热酸（48%氢氟酸和69%硝酸）蚀刻，然后用帕纳维亚SA粘结剂粘结。AHL组；全冠经空气喷砂处理后用热酸蚀刻，然后用GC LinkForce粘结剂粘结。每个氧化锆全冠均进行预处理并粘结到相应的牙齿上。经过热循环（5 - 55°C/10,000次）后，进行固位力测试，记录使全冠脱位所需的载荷，单位为牛顿（N），并记录失败模式。计算每个测试变量的固位强度（MPa）并进行统计学分析。
AHP组的固位强度平均值最高，其次是AP组，然后是AHL组。AL组的值最低。发现热酸蚀刻对氧化锆全冠的固位力有统计学显著影响（P = 0.001）。此外，粘结剂类型也有显著影响（P = 0.000）。表面处理和粘结剂类型之间的相互作用没有显著影响（P = 0.882）。帕纳维亚SA粘结剂的主要失败模式是混合失败模式，而G - CEM LinkForce的主要失败模式是粘结失败。结论：热酸蚀刻预处理提高了氧化锆全冠的固位力。热酸蚀刻联合使用帕纳维亚SA粘结剂进行氧化锆全冠的粘结有效。
