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| 根管内不同预处理对玻璃纤维桩粘接强度的影响 |
| Comparison of different dentin pretreatment protocols on the bond strength of glass fiber post |
| 投稿时间：2015-05-12 修订日期：2015-06-29 |
| DOI：10.3969/j.issn.1000-0399.2015.08.003 |
| 中文关键词: 牙根管 玻璃纤维桩 粘接强度 洗必泰 次氯酸钠 磷酸凝胶 |
| 英文关键词: Root canal Glass fiber post Bond strength Chlorhexidine Sodium hypochlorite Phosphoric acid etching gel |
| 基金项目: |
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| 摘要点击次数: 2020 |
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| 中文摘要: |
| 目的 比较3种根管内预处理方式对玻璃纤维桩粘接强度的影响。 方法 选用40颗离体无龋单根管前牙,经常规根管治疗和桩道预备后根据不同根管内预处理方式随机分为4组:I组:2%洗必泰溶液组(n=10);Ⅱ组:2.5%次氯酸钠组(n=10);Ⅲ组:35%磷酸凝胶组(n=10);Ⅳ组:生理盐水组(对照组)(n=10),采用自酸蚀双固化树脂水门汀粘接纤维桩后进行薄片推出实验,记录推出时的最大力值,扫描电镜观察根管内壁及粘接界面的微观形态,体视显微镜观察粘接界面的断裂方式。结果 I组粘接强度与对照组比较差异无统计学意义(P >0.05),Ⅱ组粘接强度值小于对照组,差异有统计学意义(P <0.05),但Ⅲ组粘接强度值明显大于对照组,且差异有统计学意义(P <0.05),断裂方式以根管牙本质与粘接材料之间的破坏为主要破坏方式,纤维桩粘接后界面观察:35%磷酸凝胶可见树脂突形成,较为致密,2%洗必泰所形成的树脂突较短,形态规则,2.5% NaClO未见明显树脂突形成。结论 采用自酸蚀系统粘接纤维桩前使用2.5%的NaClO溶液预处理可降低纤维桩粘接强度,35%磷酸凝胶可显著提高纤维桩粘接强度,而2%洗必泰溶液预处理对粘接强度无明显影响。利用35%磷酸凝胶处理可形成良好的树脂突,有利于构成立体网状结构,提高纤维桩的粘接强度。 |
| 英文摘要: |
| Objective To compare the effect of three dentin pretreatment protocols on the bond strength of glass fiber post. Methods Forty human newly extracted non-caries anterior teeth with single-rooted canal were collected and, after routine treatment of root canal and preparation of post spaces, randomly divided into four groups according to the pretreatment protocols: Group I: 2% chlorhexidine solution (CHX) (n=10); Group II: 2.5% sodium hypochlorite solution (NaClO) (n=10); Group III: 35% phosphoric acid etching gel (n=10); Group IV: saline solution (control) (n=10). Fiber posts were then luted in the treated roots using self-etching adhesive and the thin-slice push-out test was performed to record the maximun push-out strength. The dentin surface and bonding interface were examined under scanning electron microscope, and the fracture mode of fiber posts were observed by stereo microscope. Results Group I showed no significant difference in the mean bond strength value in comparison with group IV (P >0.05), and the bond strength of group II even decreased with significant difference when compared with that of the control group (P <0.05), but the bond strength of group III increased obviously and the difference was statistically significant (P <0.05). The major fracture mode of specimens were a mixed mode which contained dentin destruction. Resin rags of dentin bonding interface were observed in group III. Observation on the fiber post bonding interface revealed that the resin tags of group III were forming well and relatively dense, group I resin tags were shorter than that of the control group, with no obvious resin tags seen in group II. Conclusion Application of 2.5% sodium hypochlorite solution decreases the bond strength of glass fiber posts before bonding it with a self-etching adhesive system, whereas 35% phosphoric acid etching gel obviously increases the bond strength, and 2% chlorhexidine solution results as before. Dentin pretreatment using 35% phosphoric acid etching gel provides good resin infiltration, producing a three-dimensional interlocking micro-network of resin tags in the dentin tubules to reinforce the bond strength of fiber post. |
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