粘结层厚度对纤维桩在根管内剪切粘结强度的影响  

Effect of cement film thickness on the bond strength of fiber post in the root canal

作　　者：张文云[1,2] 王琳[1,2] 杨立斗[1,2] 肖玉鸿[1,2] 

机构地区：[1]成都军区昆明总医院 [2]昆明医学院临床学院,云南昆明650032

出　　处：《牙体牙髓牙周病学杂志》2011年第9期494-498,共5页Chinese Journal of Conservative Dentistry

基　　金：云南省社会发展计划项目(2007C143M)

摘　　要：目的:研究3种不同粘结层厚度在不同根管部位对纤维桩粘结强度的影响。方法:取18个离体上颌单根管前牙,常规根管治疗后根据不同桩道预备直径随机分为3组。Ⅰ组:直径1.2 mm的RTD纤维桩配套钻头预备桩道;Ⅱ组:直径1.4 mm的RTD纤维桩配套钻头预备桩道;Ⅲ组:直径1.6 mm的RTD纤维桩配套钻头预备桩道。桩道预备后使用酸蚀加自粘结材料(320 g/L磷酸+RelyXUnicem)对纤维桩进行粘结,之后将粘结有纤维桩的牙根切割成1 mm厚度的薄片,标记根管冠部、中部和尖部。用金相显微镜对每个薄片上粘结层的厚度进行测量,然后进行薄片推出测试,记录薄片推出力值并在光学显微镜下观察薄片的破坏方式。结果:不同粘结层厚度在不同根管段内均对纤维桩粘结强度有影响,在根管各段均以I组粘结强度最大,Ⅱ组次之,Ⅲ组最小,组间比较差异有统计学意义(P<0.05)。结论:粘结层的厚度对纤维桩在根管内的粘结强度有影响,纤维桩直径与桩道相匹配,即粘结层厚度较薄时粘结强度最高。AIM： To evaluate the effect of cement film thickness and the different root region on the bond strength of the fiber post in the root canal by the push-out test method.METHODS： Eighteen intact human maxillary central incisors were treated endodontically and divided into three groups in accordance with different drill’s diameter： groupⅠ with diameter 1.2 mm,groupⅡ with diameter 1.4 mm and group Ⅲ with diameter 1.6 mm drill.32% phosphoric etching and RelyX Unicem were used to cement diameter 1.2 mm posts.Then,six thin-slice specimens with thickness 1 mm（±0.05 mm） were made,indented as coronal,middle,and apical region.The thickness of the cement film in thin-slice specimens was measured with metalloscope before push-out test was performed.And the damage mode of thin-slice specimens was observed with optical microscope.RESULTS： The test showed that different groups with different cement film thickness achieved significantly different results（P〈0.05）.For the variable ＂root region＂,the coronal region resulted in statistically significant difference with middle or apical region（P〈0.05）in each group.CONCLUSION： The thickness of resin cement film influences the bond strength of the fiber post.Coronal root region has the highest bond strength.

关 键 词：纤维桩 粘结层厚度 根管分段 粘结强度 

分 类 号：R783.1[医药卫生—口腔医学]