3D打印与数控切削技术制作氧化锆全瓷冠机械性能和密合性能对比研究  

Compare the mechanical properties and tightness of 3D printing and CNC cutting crowns

作　　者：谭俊霞 刘鑫 韩康 吴震 TAN Jun-xia;LIU Xin;HAN Kang;WU Zhen(The First Affiliated Hospital of Harbin Medical University,Harbin Medical University,School of Stomatology,Harbin 150001,China)

机构地区：[1]哈尔滨医科大学附属第一医院,哈尔滨医科大学口腔医学院,黑龙江哈尔滨150001

出　　处：《牙体牙髓牙周病学杂志》2024年第4期210-216,共7页Chinese Journal of Conservative Dentistry

摘　　要：目的:对比3D打印与数控切削两种工艺制作氧化锆试件的弯曲强度、断裂韧性、维氏硬度及氧化锆全瓷冠边缘密合性差异,为临床提供实验依据。方法:运用万能力学实验机检测不同工艺制作陶瓷试件抗弯曲变形、抗断裂能力。运用维氏硬度仪检测两种不同工艺制作陶瓷试件硬度。同时收集标准离体牙20个随机分为3D打印和数控切削两组,每组各10个,进行牙冠预备、不同工艺制作和最终粘接,牙冠置入0.5%的碱性品红溶液中24h,体式显微镜检测微渗漏并进行分级,评估两组不同工艺制作的氧化锆全瓷冠边缘密合性。结果:3D打印组弯曲强度明显低于数控切削组,具有明显差异(P<0.05),但已达到(678.32±70.52)Mpa,达到包含磨牙的三单位修复体基底陶瓷的弯曲强度要求。3D打印组与数控切削组断裂韧性值分别为(8.63±0.94)、(6.63±1.40)MPa·m^(1/2),3D打印组断裂韧性优于数控切削组,两组具有差异(P<0.05),两者均达到包含磨牙的四单位及四单位以上修复体基底陶瓷的断裂韧性。3D打印与数控切削组硬度分别为(17.61±0.68)、(15.80±0.41)GPa。3D打印组硬度略高数控切削组,两组之间有差异(P<0.05),两组均满足临床要求。结论:3D打印氧化锆全瓷冠达到了数控切削氧化锆全瓷冠所能达到的强度、硬度、韧性和密合性,能够初步满足临床要求,为后期3D打印制作氧化锆全瓷冠应用于临床提供了合理依据,但也需进一步深入研究。AIM:Compared with the differences in bending strength,fracture toughness(KIC)and Vickers hardness(Vhn)between 3D printing technology and CNC cutting specimens.To evaluate the difference in crown tightness between the two processes.METHODS:The universal mechanical test machine is used to test the bending deformation and KIC of ceramics,The Vickers hardness instrument is used to test the ceramic hardness resistance.Meanwhile,Microleakage was used to evaluate the marginal adaptation of dental restorations.RESULTS:The bending strength of the 3D printing group was significantly lower than that of the CNC cutting group,but it had reached(678.32±70.52)Mpa,which met the flexure strength requirements of three-unit prosthetic base ceramics containing molars.The fracture toughness value of 3D printing group and CNC cutting group is(8.63±0.94)、(6.63±1.40)MPa m^(1/2).The hardness of 3D printing and CNC cutting group is(17.61±0.68)、(15.80±0.41)GPa.The 3D printing group had higher fracture toughness and hardness in the CNC cutting group,there was a difference between the two groups(P<0.05),and both groups met the clinical requirements.CONCLUSION:The strength、hardness、fracture toughness and marginal adaptation of 3D printed zirconia all-ceramic crowns can meet the clinical requirements,which provides a reasonable basis for the application of 3D printing in clinical practice,but it also needs further research.

关 键 词：3D打印 数控切削 氧化锆全瓷冠 机械性能 边缘微渗漏 

分 类 号：R783.3[医药卫生—口腔医学]