不同高度的箍结构与牙根抗力的实验研究  

Effects of various ferrule lengths on in vitro fracture resistance of premolars restored using prefabricated fiber post-and-core system

作　　者：孟庆飞[1] 陈亚明[1] 光寒冰[2] 陈丽娟[1] 王婧婧[1] 叶克刚[3] 

机构地区：[1]南京医科大学口腔医学研究所南京医科大学附属口腔医院修复科,南京210029 [2]南京医科大学义齿研发中心,南京210029 [3]香港大学菲腊牙科学院,香港999077

出　　处：《口腔医学》2007年第3期146-148,共3页Stomatology

摘　　要：目的研究不同高度的箍结构设计对预成纤维桩核修复后牙体抗力的影响。方法32颗完整离体下颌第一前磨牙于颊侧釉牙骨质界上1mm处截冠,预备残根模型;按箍结构高度不同(0.0mm、1.0mm、2.0mm、3.0mm)分为4组,预成碳纤维桩联合复合树脂核修复残根。试件自铸造全冠颈缘完成线下2mm包埋于自凝塑料内,电子万能试验机以与牙长轴成150°、横梁位移速度1.0mm/min于颊尖顶加载,测定断裂载荷并进行统计学分析(α=0.05)。结果箍结构高度为1.0mm组与箍结构高度为2.0mm和3.0mm组相比,均表现出较高的折裂载荷(P<0.05)。结论采用牙冠延长术设计高度2.0mm以上的箍结构,会降低桩核冠修复后牙体的抗力。Objective To investigate the effect of various ferrule lengths on the fracture resistance of endodontically treated teeth restored with prefabricated carbon fiber post-and-core system. Methods Thirty-two extracted endedonticaUy treated mandibular first premolars were sectioned perpendicular to the long axis at a point 1.0 mm occlusal to the buccal cementoenamel junction （CEJ）. All the prepared endodontically treated root models were divided into four groups according to the ferrule lengths from 0.0 mm to 3.0 mm with 1.0 mm interval each （Group A, B, C and D）. After restoration with prefabricated carbon fiber post-and-core system, each specimen was embedded in a self-cured acrylic resin block from 2.0 mm apical to the margins of a cast Ni-Cr alloy crown,then loaded at 150 degrees from the long axis in a universal testing machine at the crosshead speed of 1.0 mm/min until fracture. Data were recorded and analyzed using ANOVA and Fisher＇ s exact tests, with a = 0.05. Results Compared with Group C and Group D, Group B demonstrated significantly higher fracture strengths （ P 〈 0. 05）. Conclusions Crown lengthening with a ferrule length more than 2.0 mm resulted in reduced fracture strengths for endodontically treated roots restored with prefabricated carbon fiber post-and-core system and cast metal crowns.

关 键 词：箍结构 纤维桩 残根 抗力 

分 类 号：R783.3[医药卫生—口腔医学]