摘要
目的观察循环加载对全解剖式二氧化锆冠抗压强度的影响。方法制作18个标准左侧下颌第一磨牙的金属代型,利用CAD/CAM技术分别制作出对应的18个全锆冠。用3M玻璃离子将制作完成的18个全锆冠分别黏固于相应金属代型上。随机分成3组,每组6个。将A组和B组全锆冠分别固定在生物力学试验机上进行循环加载,加载频率为8Hz,循环次数为300 000次,其中A组加载力为300N,B组加载力为500N。随后将18个试件按顺序依次置于万能试验机上测试其抗压强度,记录数值。应用SPSS 21.0软件对实验所得的数据进行统计学分析。结果各组全冠的抗压强度比较差异无统计学意义(P>0.05)。结论使用不同力值对全锆冠进行300 000次循环加载对其抗压强度无明显影响。
Objective To evaluate and compare the resistance level of full-contour zirconia crowns under cyclic loading.Methods A computer aided design and computer aided manufacturing(CAD/CAM)system was used to prepare18full-contour zirconia crowns of the mandible first molar.All the crowns were bonded to the metal dies using3M glass ionomer cement and were randomly divided into A,B,C groups,each group with six.Group A and group B was respectively fixed on the biomechanical test machine for cyclic loading,with a frequency of8Hz,300000cycles.The loading force of group A was300N,and group B was500N.The compressive strength were measured by the universal testing machine.Used SPSS21.0software to analyze the data.Results There were no statistical significant differences between two groups(P>0.05).Conclusion Using different force for300000cycles on the zirconium crown load had no significant effect on its resistance to compressive strength.
作者
吴硕
廉云敏g
高岚
王璞
WU Shuo;LIAN Yun-min;GAO Lan;WANG Pu(Department of Prosthodontics, the Second Hospital of Hebei Medical University,Shijiazhuang 050000, China)
出处
《河北医科大学学报》
CAS
2019年第1期70-73,共4页
Journal of Hebei Medical University
关键词
牙冠
二氧化锆
抗压强度
循环加载
tooth crown
zirconia
compressive strength
cyclic loading
