不同牙体剩余量对石英纤维桩冠抗折性能的影响  

Effects of Different Amount of Residual Tooth on Fracture Resistance Ability in Quartz-Fiber Post Crown

作　　者：聂二民[1] 陈霞云[2] 亓莉莉[1] 刘克瑾[1] 王晓丽[1] 张春元[1] 

机构地区：[1]中山大学附属第一医院口腔科,广东广州510080 [2]中山大学附属第三医院口腔科,广东广州510630

出　　处：《中山大学学报（医学科学版）》2009年第3期290-293,共4页Journal of Sun Yat-Sen University:Medical Sciences

基　　金：广东省科技厅社会发展项目(2005B30901004)

摘　　要：【目的】评价不同牙体剩余量对石英纤维桩复合树脂核全冠修复下颌前磨牙抗折性能的影响。【方法】将正畸拔除的50颗单根前磨牙按颈部牙体剩余量分为5组(0、1、2、3mm组和对照组),离体牙行纤维桩复合树脂核金属烤瓷全冠修复,使用速率为1mm/min的45°角侧向加载。【结果】牙体剩余量0、1、2、3mm、对照组的荷载力均值分别为(601±83)、(665±59)、(950±75)、(1005±94)、(1027±80)N;0mm和1mm组的荷载力值小于2mm和3mm组以及对照组,差异具有统计学意义(P<0.05)。【结论】牙体剩余量为2mm时,石英纤维桩冠修复体抗折强度与对照组无明显差异,可认为2mm是非金属桩箍效应的临界值。[Objective] To evaluate the effects of the different amount of residual tooth on the fracture resistance ability of lower premolars restored with fiber quartz-fiber post-core and full crown. [Methods] Fifty single rooted lower premolars recently extracted from orthodontic patients were divided into five groups according to the different amount of residual tooth （0,1,2,3 mm and the control group）. All the teeth were restored with fiber post-core and full crown. Loads were applied at an 45-degrees to the long axis of the teeth at a crosshead speed of 1 ram/min. [Results] The mean loading force were （601 ± 83）, （665 ±59）, （950 ±75）, （1005 ± 94）, and （ 1027 ± 80） N in the groups with the amount of residual tooth for 0, 1,2,3 mm and the control group; While the mean loading force in 2 mm and 3 mm and the control groups was significantly higher than that in 0 mm and lmm groups（P 〈 0.05）. [Conclusion] There was no significant deference in the fracture resistance ability between the group with 2 mm amount of residual tooth with quartz-fiber post-core crown and the control group. The 2 mm may be the value of ferrule effect for non-metal post system.

关 键 词：桩冠 牙体剩余量 石英纤维桩 侧向加载 

分 类 号：R782.1[医药卫生—口腔医学]