背景:生物陶瓷水泥已广泛用于牙髓治疗。这项研究旨在比较显微硬度,弹性模量,生物牙本质的内部微观结构和化学成分,WMTA,ERRMPutty,暴露于PBS后的iRootFS和IRM,丁酸,和丁酸,然后是PBS。
方法:制备每种材料的样本,并随机分为5个亚组(n=5):亚组A:PBS(pH=7.4)4天,B亚组:PBS(pH=7.4)14天,C亚组:丁酸(pH=5.4)4天,D亚组:丁酸(pH=5.4)14天,E亚组:丁酸4天,然后与PBS接触10天。表面显微硬度,弹性模量,分析了标本的内部形态和化学成分。
结果:与暴露于丁酸相比,在存在PBS的情况下,所有材料的显微硬度和弹性模量值均显着更高,凝固时间相同(P<0.01)。暴露于丁酸4天后,再暴露于PBS10天后,显微硬度值恢复到与PBS暴露4天相同的水平(P>0.05)。生物牙本质显示出比其他材料显著更高的显微硬度和弹性模量值,而IRM显示最低(P<0.01)。
结论:当应用于酸性pH的感染区域时,生物牙本质似乎是最合适的生物陶瓷粘固剂。在中性pH下进一步储存,例如,PBS逆转了由低pH环境引起的对生物陶瓷水泥的不利影响。
Bioceramic cements have been widely used in endodontic treatment. This study aimed to compare the microhardness, elastic modulus, internal microstructure and chemical compositions of Biodentine, WMTA, ERRM Putty, iRoot FS and IRM after exposure to PBS, butyric acid, and butyric acid followed by PBS.
Specimens of each material were prepared and randomly divided into 5 subgroups (n = 5): subgroup A: PBS (pH = 7.4) for 4 days, subgroup B: PBS (pH = 7.4) for 14 days, subgroup C: butyric acid (pH = 5.4) for 4 days, subgroup D: butyric acid (pH = 5.4) for 14 days, subgroup E: butyric acid for 4 days followed by 10 days in contact with PBS. The surface microhardness, elastic modulus, internal morphologic and chemical compositions of specimens were analyzed.
The microhardness and elastic modulus values of all materials were significantly higher in the presence of PBS compared to exposure to butyric acid, with the same setting time (P < 0.01). After 4-day exposure to butyric acid followed by 10-day exposure to PBS, the microhardness values returned to the same level as 4-day exposure to PBS (P > 0.05). Biodentine showed significantly higher microhardness and elastic modulus values than other materials, while IRM displayed the lowest (P < 0.01).
Biodentine seems the most suitable bioceramic cements when applied to an infected area with acidic pH. Further storage at neutral pH, e.g. PBS reverses the adverse effects on bioceramic cements caused by a low pH environment.