摘要
目的:用三维有限元法对桩核冠进行应力分析,研究不同材质的冠对分析结果的影响。方法:采用测量法建模,根据标准的桩核冠制作要求,应用美国I-DEAS有限元分析软件分别建立三套上中切牙的三维有限元模型,其中A组包括铸造金属桩核、制备后的牙体组织、牙周组织;B组包括金属烤瓷冠、铸造金属桩核、制备后的牙体组织、牙周组织;C组包括树脂冠、铸造金属桩核、制备后的牙体组织、牙周组织。在同等条件下以上中切牙的平均牙合力分别给予加载,并对计算结果进行综合分析。结果:(1)从牙本质的应力大小来看,A组中牙本质最大应力值比B组中牙本质最大应力值增大了1倍以上(最大主应力、最小主应力和最大剪切应力A组分别是B组的236.35%、228.83%和218.05%),而B组与C组的牙本质最大应力值相差极小;(2)从牙本质的应力分布位置来看,A组与B组的牙本质最大应力分布位置相差甚远(A组主要集中在牙颈部唇舌侧肩台部的牙本质上,B组主要集中于牙槽嵴顶附近及铸造桩核尾端相对应的唇舌侧的牙本质上),而B组与C组的牙本质最大应力分布几乎在同一位置。结论:用三维有限元法对桩核冠进行应力分析时,不同材质的冠对分析结果无明显影响。
PURPOSE： To analyze the stress of the post and core system by using finite element analysis and study the influence of the ＂crown materials＂ on the analytic results. METHODS： Three groups of 3D finite element models of maxillary incisors were established according to the fabricating standard of the post and core system by using I-DEAS finite element analysis software. Group A was consisted of the cast metal post and core, the tooth structure after preparation and the periodontal structure. Group B was composed of the PFM, the cast metal post and core, the tooth structure after preparation and the periodontal structure. Group C was composed of the resin crown, the cast metal post and core, the tooth structure after preparation and the periodontal structure. The three groups were loaded and analyzed under the same loading according to the mean value of the bite force of incisors. RESULTS： （1）The maximum stress of dentin in group A was twice higher than that in group B. The maximum primary stress, minimum primary stress and maximum shear stress of group A were respectively 236.35, 228.83 and 218.05 percent of those in group B. The difference of maximum stress values of group B and group C was neglectable. （2） The maximum stress distribution of dentin in group A and group B was quite different （the stress was concentrated in labial and lingual side of the cervical dentin in group A, otherwise in group B it was concentrated in the area around the alveolar and the labial and lingual side of the dentin which was opposite to the tip of the cast metal post and core）. The maximum stress distribution of dentin in group A and group B was almost the same. CONCLUSIONS： Different materials of the crown did not influence the result of 3D finite element stress analysis of the post and core system.
出处
《上海口腔医学》
CAS
CSCD
2005年第6期613-616,共4页
Shanghai Journal of Stomatology
基金
上海市重点学科(特色学科)建设项目(T0202)
关键词
三维有限元
桩核冠
应力分析
3D finite element analysis
Post and core system
Stress analysis
