摘要
目的分析垂直加压充填和侧向加压充填对根管壁应力的影响。方法在模拟逐步后退法修改下颌第一磨牙有限元模型的基础上,选取近中颊侧根管为研究对象,模拟侧压充填和垂直充填法的过程,通过特定有限元分析软件,计算不同加压方法产生的管壁最大能量应力及最大应力的位置。结果同样的加压条件下,垂直加压产生的管壁应力大于侧方加压产生的管壁应力,垂直加压的最大应力位于受压面,侧方加压的最大应力位于根上1/3和根中1/3的受压侧。受压位置越低,管壁应力越大。结论侧压充填并不直接造成牙根纵裂。反之,无论何种充填方法,压力过大或操作不当都有造成牙根纵裂的危险。
Objective To analyse the stress variations of root canal wall that resulted from vertical and lateral condensation.Methods On the basis of the finite-element model of the mandibular first molar that modified by step-back technique,mesial-buccal root canal was chosen as tested root canal and simulated the procedure of vertical and lateral condensation.The maximal stress of root canal wall and its position were calculated by special software upon different loading condition.Results Stress of root canal wall caused by vertical condensation was higher than that by lateral condensation on the same loading condition.Maximal stress of vertical condensation was located on loading section and one of lateral condensation was located on coronal and middle1/3of root.The lower the position that was loaded,the higher the stress of wall of root canal.Conclusion Lateral condensation will not bring on vertical root fracture directly,but over-force and improper operation are both dangerous that gives rise to vertical root fracture with whichever method.
出处
《上海口腔医学》
CAS
CSCD
2003年第5期359-361,共3页
Shanghai Journal of Stomatology
基金
上海市科学技术发展基金(984419669)
关键词
垂直加压
侧方加压
根管壁
三维有限元
应力分析
Vertical Condensation
Lateral Condensation
Root Canal Wall
Finite-Element Mothed
Stress Analysis
