三种固位形用于前牙断冠再接的效果评价  

Shear bond strength of tooth fragment reattachment using three different retention forms

作　　者：黄娟[1] 吴友农[2] 梁红[1] 

机构地区：[1]泰州市人民医院口腔医学专科,江苏泰州225300 [2]江苏省口腔医院,江苏南京210029

出　　处：《临床口腔医学杂志》2017年第7期418-420,共3页Journal of Clinical Stomatology

摘　　要：目的:比较三种固位形用于前牙断冠再接的效果差异。方法:自制上颌恒中切牙冠折模型40个,随机等分为4组,不预备固位形,直接再接(A组),斜面(B组)、牙本质内沟(C组)及唇面覆盖(D组),进行断冠再接,24h后置于万能试验机上,垂直于牙唇面,作用在牙冠折裂线处,直至折断,记录折断时的加载力值。结果:四组再接后的剪切力分别为:(211.31±59.30)N,(300.29±89.81)N,(349.24±86.84)N,(327.03±85.85)N。B,C,D组再接后的剪切力均大于A组,差异有统计学意义(P<0.05);B,C,D组再接后的剪切力之间差异无统计学意义(P>0.05)。结论:预备固位形能增强再接后的强度。Objective：To compare the shear bond strength of the fraetured anterior teeth reatlached by three retention forms. Methods：Forty anlerior crown fractured teeth were divided into four groups randomly. Group A was simply reattaehed, group B with bevel,group C with internal dentinal grnnve and group D with overenntnur. Then the specimens were submitted to an axial compression lest in a universal testing maehine. The spade was put on the hueeal surface of the tooth with a speed of 1 tony/ min until tooth fractured. Results：The mean shear bond strength of the restored fuur groups were group A（211.31± 59.30） N.group B （300. 29± 89.81 ） N, group C （ 349.24 ± 86. 84 ） N and group D （ 327.03 ± 85.85 ） N. The strength of group B,C, 1） were statistieally higher than group A（ P 〈0. 05 ）,but were not statistically different within them（ P 〉 0. 05 ）. Conclusion：The retention forms can strengthen the effect of tooth fragment reattachment.

关 键 词：断冠再接 冠折 剪切力 固位形 

分 类 号：R781.05[医药卫生—口腔医学]