河北医科大学学报

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循环加载对全解剖式二氧化锆冠抗压强度的影响

  

  1. 河北医科大学第二医院口腔修复科,河北 石家庄 050000
  • 出版日期:2019-12-25 发布日期:2018-12-29
  • 作者简介:吴硕(1991-),女,河北保定人,河北医科大学第二医院医学硕士研究生,从事口腔疾病诊治研究。

Effect of cyclic loading on the compressive strength of fullcontour zirconia crowns

  1. Department of Prosthodontics, the Second Hospital of Hebei Medical University, Shijiazhuang 050000, China
  • Online:2019-12-25 Published:2018-12-29

摘要: [摘要]〓
〖HTH〗目的〖HTSS〗〖KG*2〗观察循环加载对全解剖式二氧化锆冠抗压强度的影响。
〖HTH〗方法〖HTSS〗〖KG*2〗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8 Hz,循环次数为300 000次,其中A组加载力为300 N,B组加载力为500 N。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。
〖HTH〗结果〖HTSS〗〖KG*2〗各组全冠的抗压强度比较差异无统计学意义(P>005)。
〖HTH〗结论〖HTSS〗〖KG*2〗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。

关键词: 牙冠, 二氧化锆, 抗压强度, 循环加载

Abstract: 〗[Abstract] Objective〖HTSS〗〓To evaluate and compare the resistance level of fullcontour zirconia crowns under cyclic loading.
〖HTH〗〖WTHZ〗Methods〖HTSS〗〓A computer aided design and computer aided manufacturing(CAD/CAM) system was used to prepare 18 fullcontour zirconia crowns of the mandible first molar. All the crowns were bonded to the metal dies using 3M 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 of 8 Hz, 300 000 cycles.The loading force of group A was 300 N,and group B was 500 N. The compressive strength were measured by the universal testing machine. Used SPSS 21.0 software to analyze the data.
〖HTH〗〖WTHZ〗Results〖HTSS〗〓There were no statistical significant differences between two groups(P>005).
〖HTH〗〖WTHZ〗Conclusion〖HTSS〗〓Using different force  for 300 000 cycles on the zirconium crown load had no significant effect on its resistance to compressive strength.

Key words: tooth crown, zirconia, compressive strength, cyclic loading