四种桩材料对牙本质应力分布影响的三维有限元分析  

Analysis of 4 Different Post Materials on Dentinal Stress of Maxillary Central Incisor Restored with PFM Crown with Three dimensional Finite Element Method

作　　者：唐高妍[1,2] 巢永烈[1,2] 文志红[1,2] 樊瑜波[1,2] 

机构地区：[1]华西医科大学口腔医学院 [2]四川联合大学土木力学系生物力学所

出　　处：《华西口腔医学杂志》1998年第3期259-262,共4页West China Journal of Stomatology

摘　　要：选用计算机建立上颌中切牙金属烤瓷核桩冠三维有限元模型，分别分析ＳＤＡ－Ⅱ型中熔合金桩、复合树脂桩、Ｎｉ－Ｃｒ高熔合金内层加复合树脂外层复合桩及ＳＤＡ－Ⅱ型中熔合金内层加复合树脂外层复合桩修复后的牙本质应力分布状况。结果表明：金属桩降低牙本质应力峰值作用较明显，但改变牙本质内原有的应力分布模式，在桩与牙本质交界处出现应力集中现象；复合树脂桩不改变牙本质内原有应力分布模式，但降低应力峰值作用不明显；而复合桩一方面避免了桩与牙本质交界处出现应力集中，另一方面具有较单纯的复合树脂桩更好的强度。In order to known how post materials influenced dentinal stress distribution,the models of maxillary central incisor restored with porcelain fused to metal crown and post of 4 different materials were constructed by using the three dimensional approach with finite element method,and whose 4 different posts were SDA Ⅱ alloy post,composite resin post,the inner Ni Cr alloy with the outer resin post and the inner SDA Ⅱ alloy with the outer composite resin post. The results showed that metal post with high elastic modules reduced the peak of dentinal stress to some extend but changed the pattern of the stress distribution with high stress concentrating at the border between the post and the dentin. The resin post with low elastic modules would not alter the original inclination of the dentinal stress distribution,but had little influence on lessening the dentinal peak stress. Furthermore the compound resin post strengthened with metal alloy restoration did not cause stress focusing on the dentin around the post,on the other hand,the inner alloy structure enhanced the post itself. The results suggest mechanically that the inner alloy with the outer composite resin post is possibly a good post design.

关 键 词：桩材料 桩核 牙应力 三维有限元法 牙本质 

分 类 号：R783.3[医药卫生—口腔医学] R318.01[医药卫生—临床医学]