四种桩表面处理对玻璃纤维桩黏结强度的影响

摘要

背景:报道显示不同的表面处理方法与纤维桩黏结强度密切相关.目的:比较4种桩表面处理对玻璃纤维桩表面形貌及黏结强度的变化.方法:根据对玻璃纤维桩表面不同的处理分5个实验组,分别为过氧化氢组、乙醇钠组、磷酸组、氢氟酸组、对照组(蒸馏水处理).选择25颗冠根形态完整、根长近似的单根管下颌前磨牙,去除牙冠,完成根桩的牙体预备后,将玻璃纤维桩黏固于根管内.用慢速金刚石切割机将每个牙根垂直于牙体长轴切割出3个2 mm厚的测试样本.电子万能试验机对各组(n=15)样本进行纤维桩推出实验并记录数值.对实验数据进行单因素方差分析和多重比较.使用体视显微镜观察样本的破坏模式.结果与结论:黏结强度值由高到低如下:乙醇钠组>过氧化氢组>氢氟酸组>磷酸组>对照组.除了氢氟酸组和磷酸组比较差异无显著性意义外(P > 0.05),每两组间比较差异均有显著性意义(P < 0.05);样本的失败模式主要为混合破坏.结果表明,使用乙醇钠和过氧化氢进行纤维桩表面处理可有效提高玻璃纤维桩与牙本质的黏结强度.%BACKGROUND: Bond strength of fiber posts is closely related to different surface treatments.OBJECTIVE: To compare the effect of four surface treatments on the surface morphology and bond strength of fiber posts. METHODS: According to the four different surface treatments, 25 mandibular premolars were randomly divided into five groups: hydrogen peroxide group, sodium ethoxide group, phosphoric acid group, hydrofluoric acid group, and control group (distilled water). Twenty-five single-rooted mandibular premolars that had similar dimensions were used. After endodontic treatment, removal of the crown and canal preparation, cemented POPO glass fiber posts were inserted in to the root canal. Then each root was cut perpendicularly to the long-axis with the slow saw to obtain three 2.0-mm-thick slides as test samples. Specimens of each group (n=15) were loaded with a universal testing machine until failure occurred. The data obtained were submitted to the one-way analysis of variance and multiple comparisons, and the failure mode of each specimen was observed. RESULTS AND CONCLUSION: Bond strength values from the highest to the lowest were as follows: sodium ethoxide group>hydrogen peroxide group > hydrofluoric acid group > phosphoric acid group > control group. Significant difference (P < 0.05) was showed between every two groups except for hydrofluoric acid and phosphoric acid groups (P > 0.05). Failure- modes of specimens were mainly mixed damage. These findings indicate that sodium ethoxide and hydrogen peroxide treatment combined with surface treatment can enhance the bond strength of fiber posts to the root dentin.