【摘要】 目的用三维有限元的方法分析纤维桩联合辅桩修复前牙薄弱根管的应力。方法本试验建立了9个上颌中切牙薄弱根管的三维实体模型,分为5组,由2种桩核系统(瓷桩、纤维桩及辅桩)修复。采用静态加载法,在牙冠切1/3和中1/3连接处链接5个点成线状135°以100N的力加载。记录并比较牙体、树脂粘结剂和桩核的应力值。结果最大的牙体应力值111.9Mpa和最大的树脂粘结剂应力值54.6 Mpa均出现于单用一根石英纤维桩修复后的模型,用瓷桩修复模型的桩核应力值最大为48.1 Mpa。纤维桩联合一根辅桩修复模型的各部位应力值都明显下降。石英纤维桩联合多根辅桩修复后各部位应力值均无继续减小。结论建议纤维桩联合一根辅桩修复薄弱根管。更多还原

【Abstract】 Objective To assess the stresses of fiber posts combined with auxiliary posts in anterior teeth with flared canals by three dimensional finite element method.Methods Nine 3Dmodels of maxillary first incisors with flared canals restored by two post systems(porcelain pile,fiber and auxiliary pile)divided into 5groups were generated.By static loading method,dental crowns cut 1/3and middle 1/3connection link five points into 135 angles by 100 Nforce loading.The major stress for the dentin and the equivalent Von Mises stress for resin cement and post and core were calculated.Results Biggest tooth stress value of 111.9 Mpa and the largest resin adhesive stress value 54.6Mpa had appeared in the use of a model of the quartz fiber post after repair,ceramics pile repair model of pile nuclear stress value and the maximum was 48.1 Mpa.Combining with one auxiliary post,stress values reduced significantly in dentin,in cement and in post and core.However,as more auxiliary posts were added,the stresses did not decrease sequentially.Conclusion It is suggested that to restore the tooth with flared canals by quartz fiber post combining with one auxiliary post.更多还原