“一滴棒”用于银汞合金粘结效果的扫描电镜研究

The adhesive ability of “One Coat Bond” used in bonded amalgam restoration:A SEM study

目的:观察“一滴棒”用做银汞合金粘结剂来处理窝洞壁,对银汞合金充填体与牙体粘结的影响。方法:采用因正畸需要拔除的健康人新鲜恒前磨牙,按要求制成牙本质洞。实验组:“一滴棒”粘结材料处理窝洞壁后(其中A组用压缩空气吹干-干粘结法,B组用脱脂棉球擦干-湿粘结法),均在粘结材料未凝固前立即充填新鲜调制的银汞合金;对照组:窝洞壁未作特殊处理,直接银汞合金充填。扫描电镜观察银汞合金充填体-“一滴棒”粘结材料-牙体界面的形态,并测量充填体边缘缝隙宽度和粘结剂厚度。结果:实验组充填体边缘缝隙平均宽度(A组4.82μm,B组为0)显著小于对照组(11.33μm)(P<0.05),2实验组间粘结剂平均厚度无明显差异(A组62.66μm,B组59.54μm)(P>0.05)。结论:“一滴棒”粘结材料用于银汞合金粘结可显著改善银汞合金充填体边缘密合性,干粘结和湿粘结法对粘结剂厚度无明显影响。

Objective:To observe the effect of “One Coat Bond” on the interface between amalgam restoration and cavity wall used in bonded amalgam restoration(BAR).Methods:Dentin cavities were made on 15 healthy human premolars extracted for orthodontics therapy.The teeth were divided into 3 groups with 5 in each group.In group A compressive air was used to dry the cavities(dry adhesion) whereas in group B absorbent cotton was used (wet adhesion). Then the cavity walls in the two groups were treated with the “One Coat Bond”, the cavities were filled with freshly prepared amalgam before adhesive concrete.In group C cavities were filled directly with amalgam without treatment of cavity walls. Morphology of amalgam restoration/“One Coat Bond” adhesive/dentin cavity wall interface was observed under SEM, thickness of adhesive and width of space between amalgam restoration and cavity wall was measured. Results:Average width(μm) of space between restoration and cavity wall was 4.82 in group A, 0 in group B and 11.33 in group C(P<0.05).The thickness of adhesive was 62.22 μm in group A and 59.54 μm in group B (P>0.05).Conclusion:“One Coat Bond” adhesive can significantly improve the compactness between amalgam and cavity wall.