表面处理试剂及处理时间对玻璃纤维桩与树脂粘接强度的影响

Effect of surface treatment reagents and treatment time on bond strength of glass fiber posts to resin cement

背景:目前临床上使用的对玻璃纤维桩进行表面处理的化学试剂,其处理时间尚无统一标准,因此探讨玻璃纤维桩表面处理试剂处理时间对纤维桩与树脂水门汀之间粘接强度的影响具有重要意义。目的:评价2种化学试剂对玻璃纤维桩进行不同时间的表面预处理后,对玻璃纤维桩与树脂水门汀粘接强度的影响。方法:将48根玻璃纤维桩随机分成8组,每组6根:A组不作任何特殊处理;B组硅烷化处理1min;C1组体积分数30%H2O2表面处理5 min后硅烷化处理1 min;C2组体积分数30%H2O2表面处理10 min后硅烷化处理1min;C3组体积分数30%H2O2表面处理15min后硅烷化处理1min;D1组35%磷酸表面处理30 s后硅烷化处理1 min;D2组35%磷酸表面处理60 s后硅烷化处理1 min;D3组35%磷酸表面处理90 s后硅烷化处理1 min;扫描电镜观察处理后玻璃纤维桩的表面形态。将玻璃纤维桩与树脂水门汀粘接,制作成圆柱形树脂块并切割成薄片样本,使用万能试验机对薄片进行微推出实验,使用体视显微镜观察薄片试件破坏模式。结果与结论:①扫描电镜:经H2O2与磷酸处理后,玻璃纤维桩表面有不同程度的基质溶解和纤维束暴露,但纤维束完整性均未被破坏;②微推出实验:粘接强度排序为:C3组>C2组>C1组>D2组>D3组>D1组>B组>A组,除A组与B组、C2组与C3组、D2组与D3组粘接强度比较无差异外,其余组间两两比较差异均有显著性意义(P <0.05);③体视显微镜:A、B组的破坏模式几乎全部为粘接破坏;其余6组的破坏模式虽然以粘接破坏为主,但内聚破坏和混合破坏数量增多,破坏模式逐渐由粘接破坏向内聚破坏和混合破坏转变;④结果表明:体积分数30%过氧化氢溶液的最佳处理时间为10 min,35%磷酸处理的最佳处理时间为60 s,体积分数30%过氧化氢溶液处理纤维桩表面10 min具有较大的临床应用价值。

BACKGROUND: At present, there is no uniform standard for the treatment time of chemical reagents for surface treatment of glass fiber posts.Therefore, studying the effect of treatment time of glass fiber post surface treatment reagents on the bond strength between fiber posts and resin cements is of great significance.OBJECTIVE: To evaluate the effect of two chemical agents on the bonding strength of glass fiber post and resin cement after surface pretreatment of glass-fiber posts at different times.METHODS: Forty-eight glass fiber posts were randomly divided into eight groups according to different surface treatment methods, six in each group. Group A received no special treatment;group B was treated with silanization for 1 minute;group C1 underwent a 30% hydrogen peroxide surface treatment for 5 minutes prior to 1-minute silanization;group C2 underwent a 30% hydrogen peroxide surface treatment for10 minutes prior to 1-minute silanization;group C3 underwent a 30% hydrogen peroxide surface treatment for 15 minutes prior to 1-minute silanization;group D1 underwent a 35% phosphoric acid surface treatment for 30 seconds prior to 1-minute silanization;group D2 underwent a 35% phosphoric acid surface treatment for 60 seconds prior to 1-minute silanization;group D3 underwent a 35% phosphoric acid surface treatment for 90 seconds prior to 1-minute silanization. The surface morphology of the treated glass fiber posts was observed under scanning electron microscope. The glass fiber post was bonded to the resin cement to form a cylindrical resin block and cut into a thin sample. The sheet was placed on a universal testing machine for micro-extrusion experiments. The failure mode of the specimens was observed under a stereo microscope.RESULTS AND CONCLUSION:(1) Scanning electron microscope: the surface of the fiber post had different degrees of matrix dissolution and fiber bundle exposure after hydrogen peroxide and phosphoric acid treatment, but did not destroy the integrity of the fiber bundle.(2)Micro-extrusion experiments: the order of the bonding strength was as follows: group C3 > group C2 > group C1 > group D2 > group D3 >group D1 > group B > group A, and there was significant difference between groups(P < 0.05) except for groups A and B, groups C2 and C3,and groups D2 and D3.(3) Stereo microscope: the failure mode in the groups A and B was almost destruction in adhesion. The other six groups showed destruction in adhesion, but the cohesive failure and mixed failure were increased, and the failure mode changed from destruction in adhesion into cohesive failure and mixed failure.(4) These results indicate that the optimal treatment time of 30% hydrogen peroxide is 10 minutes, and the optimal treatment time of 35% phosphoric acid is 60 seconds. 30% hydrogen peroxide solution treatment of fiber post surface for 10 minutes has great clinical application value.