不同桩核修复根管治疗牙抗疲劳强度的体外研究  

Resistance to cyclic fatigue of endodontlcally treated teeth with different post-and-core materials

作　　者：张占利[1] 管宏伟[1] 

机构地区：[1]威海市立医院口腔科,264200

出　　处：《实用口腔医学杂志》2010年第6期785-788,共4页Journal of Practical Stomatology

摘　　要：目的:探讨不同桩核修复根管治疗牙抗疲劳强度。方法:60颗离体上颌中切牙均分为无肩领和有肩领2个实验组。各实验组再分为3部分,各10颗样牙。每部分分别用铸造金属桩核、预成碳纤维桩联合复合树脂核及预成金属桩联合复合树脂核进行修复后再进行全冠修复。测定各样本牙疲劳强度并对实验结果进行双因素方差检验(α=0.05)。结果:2个实验组中,用预成碳纤维桩联合复合树脂核修复组根管治疗牙根的平均疲劳强度显著高于金属桩核修复组(P<0.05)。预备牙本质肩领可显著提高3种桩核材料修复牙的疲劳强度(P<0.05)。结论:纤维桩联合复合树脂核在提高前牙牙根抗疲劳强度方面优于铸造金属桩核和预成金属桩树脂核。保留牙本质肩领,对提高牙根的抗疲劳强度具有重要意义。Objective：To observe the resistance to cyclic fatigue of maxillary incisors with flared canals restored with different post-and-core materials.Methods：Standard cylindrical samples with flared canals were made from 60 human maxillary central incisors and were assigned randomly to two groups（without ferrule and with 1 mm ferrule respectively）.Each group was then divided into 3 sub-groups of 10 specimens and restored with cast metal post-core-crown,carbon fiber＋resin composite post-core-crown,and preformed metal＋resin composite post-core-crown,respectively.Each sample was subjected to a cyclic fatigue test,and the numbers of load cycles that had tooth fracture were measured with cyclic fatigue testing machine.All data were analyzed statistically for two-way ANOVA with SPSS 13.0 software package（α=0.05）.Results：Fiber＋resin composite post-core-crown showed significantly higher fatigue strength than cast metal post-core-crown in the two groups（P〈0.05）.Preparing dentin ferrules significantly increased fatigue resistance（P〈0.05）.Conclusion：Fiber post-and-core system may get a long fatigue life in restoring endodontlcally treated teeth.Dentin ferrule preparation is necessary to enhance resistance to cyclic fatigue.

关 键 词：切牙 桩核 根管治疗 疲劳强度 

分 类 号：R783.3[医药卫生—口腔医学]