桩道预备及桩核修复对根尖封闭性的影响  

The effects of post space preparation and post restoration on apical sealing ability

作　　者：陈梅[1] 冯云枝[1] 

机构地区：[1]中南大学湘雅二医院口腔中心,湖南长沙410011

出　　处：《华西口腔医学杂志》2009年第5期512-515,共4页West China Journal of Stomatology

基　　金：国家博士后科学基金资助项目(2005037699);湖南省科委基金资助项目(06JJ4125)

摘　　要：目的比较即刻、延迟桩道预备及桩核修复对根尖封闭性的影响。方法选择60颗离体下颌单根管前磨牙,使用ProTaper镍钛锉和冠向下法进行根管预备。将样本分为5组,除阳性对照组外其余样本均用AH-Plus封闭剂、侧方加压法进行根管充填。A组为即刻桩道预备组,B组为延迟桩道预备组,C组为无桩道预备组,D组为阳性对照组,E组为阴性对照组。其中A、B组再各分为2个亚组,A1、B1组为桩道预备后采用暂封材料封闭,A2、B2组为桩道预备后立即行纤维桩核修复。使用印度墨水染色法测定各组牙齿的根尖微渗漏情况,体视显微镜下测量染料渗入根管内壁的长度,并行统计学分析。结果A1、A2、B1、B2、C组染料渗入长度分别为(0.52±0.47)、(0.49±0.44)、(1.17±0.77)、(1.12±0.54)、(0.23±0.40)mm,阳性对照组染料渗入根管全长,阴性对照组无染料渗入。经统计学分析,A1与A2、B1与B2组间染料渗入长度没有统计学差异(P>0.05);但B1、B2组的染料渗入长度与A1、A2、C组间的差异有统计学意义(P<0.05),B组渗入长度较长;A1、A2和C组间的差异无统计学意义(P>0.05)。结论延迟桩道预备会削弱充填材料及AH-Plus封闭剂封闭根尖的能力。Objective To investigate the effects of post space preparation and post restoration on apical sealing ability. Methods 60 extracted mandibular premolars each with single canal were selected. All canals were prepared by manual ProTaper instrument using crown-down technique. The samples were the divided into 5 groups randomly. Group A： 20 samples, the immediate post space preparation group; group B： 20 samples, the delayed post space preparation group; group C： 10 samples, the intact group; group D： 5 samples, a positive control; group E： 5 samples, a negative control. There were two subsets in groups A and B which were restored by temporary materials CA1 and B1）or fiber post and coresCA2 and B2）. Indian ink dye method was used to measure the apical leakage in stereomicoscope. Results The mean length of dye penetration for group A1, A2, B1, B2 and C were （0.52±0.47）, （0.49±0.44）, （1.17±0.77）, （1.12±0.54）, and （0.23±0.40）mm, respectively. Positive group demonstrated maximum dye penetration, and negative group showed no dye penetration. There was no statistically significant difference between group A1, A2 and group C （P〉0.05）. However, there were statistically significant differences between group B and group A, C （.P〈0.05）. The length of dye penetration for group B was longer than that for group A and C. Conclusion The sealing ability was decreased after delayed post space preparation when using the AH-Plus sealer.

关 键 词：根尖微渗漏 桩道预备 桩核 

分 类 号：R783.3[医药卫生—口腔医学]