根管再湿润对纤维桩粘接强度及粘接耐久性的影响  

The effect of root canal re-wetting on push-out bond strength and durability of fiber post

作　　者：姚科[1] 宋洁文[2] 李彦[1] 

机构地区：[1]中山大学光华口腔医学院·附属口腔医院修复科·中山大学口腔医学研究所,广州510055 [2]广州市第八人民医院口腔科

出　　处：《中华口腔医学杂志》2011年第2期89-93,共5页Chinese Journal of Stomatology

摘　　要：目的 利用薄片推出实验检测脱水及再湿润过程中纤维桩与根管各区段的粘接强度及粘接耐久性,以期为临床桩核修复提供实验依据.方法 将36颗离体牙用随机数字表均分为过干燥组、再湿润组及对照组,分别进行纤维桩粘接,将牙根横向切割为1.0 mm厚的切片,每颗牙选取根颈部、根中部和根尖部各2个切片,即刻及水储存2个月后进行薄片推出实验,并对破坏试件进行扫描电镜观察.结果 过干燥组、再湿润组和对照组纤维桩即刻实验的粘接强度分别为（5.97±1.97）、（7.67±2.19）和（8.46±2.35）MPa 水储存2个月后粘接强度分别为（2.08±1.67）、（2.99±1.48）、（3.22±1.43）MPa.即刻实验和水储存2个月后,过干燥组与再湿润组、过干燥组与对照组间差异均有统计学意义（P＜0.05）.根颈段牙本质比根管其他区段能提供更大的粘接强度（P＜0.05） 水储存对纤维桩粘接强度有显著影响（P＜0.05）.结论 根管过度吹干处理可影响纤维桩的粘接强度及粘接耐久性.水灌注可使过干燥管壁牙本质重新恢复湿润状态,恢复纤维桩正常的粘接强度及粘接耐久性.Objective To analyze the push-out bond strength of fiber post and the durability of interface between dentin and composite resin during over drying and re-wetting of root canal. Methods Thirty-six extracted human maxillary central incisors were randomly divided into three groups： Group A for the process of over drying, Group B for re-wetting, Group C for control. All teeth were sliced into several thin discs with thickness of 1.0 mm for micro push-out test and scanning electron microscope （SEM）observation. Results Push-out shear strengths of fiber post immediately after bonding in group A, B and C were （5. 97 ± 1.97）, （7.67 ± 2. 19） and （8. 46 ± 2. 35） MPa. Push-out strengths of fiber post two months after water storage were （2. 08 ± 1.67）, （2. 99 ± 1.48） and （3. 22 ± 1.43） MPa. There was significantly difference in push-out strength between Group A and Group B（P 〈0. 05）. Significantly difference in pushout strength was also found between Group A and Group C. In the condition of immediate testing, there was also significantly difference between push-out strength of cervical slice and middle slice, and between cervical slice and apical slice（P 〈0. 05）. The water storage time has significant effect on the push-out bond strength of fiber posts （P 〈 0. 05）. Conclusions Inappropriate condensation air blowing operation can cause extracted teeth root canal dentin over dry. Dehydration can destroy the formation of general structure of interface between composite resin and dentin. The over dry dentin can be turned back to wetting stage by water pouring, which can help fiber-reinforced composite post regain its normal retention strength and original adhesive durability.

关 键 词：桩核技术 牙黏合 薄片推出实验 

分 类 号：R783.1[医药卫生—口腔医学]