铸造桩表面喷砂处理对牙根抗折性能影响的体外实验研究

An in vitro study on the fracture resistance of teeth restored with surface sandblasted casting posts

目的:研究铸造桩表面喷砂处理对牙根抗折性能的影响。方法:20颗近期拔除的单根第一前磨牙,根管治疗后于釉牙骨质界冠方1.5mm截冠,随机分为2组,铸造桩核及金属全冠修复。实验组铸造桩粘固前表面喷砂处理,对照组不作处理。试件包埋于丙烯酸树脂块中,在电子万能实验机上进行测试。结果:对照组牙根折裂强度为2.773±0.357kN,实验组牙根折裂强度为3.113±0.357kN,2组间差异具有统计学意义(P<0.05)。结论:对铸造金属桩表面进行喷砂处理,可以提高桩核冠修复后牙根的抗折强度。

Objective： To measure the fracture resistance of teeth restored with surface sandblasted casting posts. Methods： Twenty recently extracted human single root first premolars were endodontically treated and randomly divided into two groups of ten each. About 1.5mm ferrule was prepared for each of the teeth. All of the specimens received casting post and core and metal crowns. The casting posts in the testing group were sandblasted on the surface while those in the other group were not. Each specimen was embedded in acrylic resin and tested in a universal material testing machine. Results： The fracture loads were 2.857±0.449kN for control group and 3.113±0.357kN for testing group. The difference between the two groups was statistically significant （P〈0.05）. Conclusion： Surface sandblasting to the casting posts results in significantly higher fracture resistance than that without the process.