冷热循环对两种表面进行瓷修补强度影响的研究  

In vitro study of effects of thermocycling to bond strengths of porcelain repairing on two surfaces

作　　者：邱憬[1] 陈亚明[1] 冯丽君[1] 

机构地区：[1]江苏省口腔医院口腔修复科,江苏南京210029

出　　处：《临床口腔医学杂志》2010年第6期357-360,共4页Journal of Clinical Stomatology

摘　　要：目的:探讨模拟口内冷热循环刺激对两种表面瓷修补树脂粘结强度的影响。方法:分别制作20个镍铬合金试件和烤瓷试件,采用Clearfil Repair瓷修补系统进行粘接修复。镍铬合金试件随机分A、B组,烤瓷试件随机分C、D组。B、D组经5000次冷热循环(5℃和55℃)。测定各组试件的剪切粘接强度,观察断裂模式。结果:剪切强度C、D组显著高于A、B组,A组显著高于B组,C、D组间无显著性差异。断裂模式:A、B组全部表现为粘结破坏,C、D组主要为发生于瓷层内的内聚破坏,少数为混合破坏。扫描电镜观察:冷热循环后,树脂-金属断裂面的树脂残留明显减少,树脂-瓷断裂面仍见明显树脂突及瓷层折裂。结论:树脂-瓷的粘接强度显著高于树脂-金属的粘接强度,模拟口内冷热循环刺激对树脂-金属的粘结强度具有显著性影响。Objective：To study effects of simulating intra-oral thermocycling to bond strengths of porcelain repairing on two surfaces.Method：Twenty Ni-Cr alloy specimens and twenty porcelain fused metal specimens were fabricated.With the use of Clearfil Repair kits,specimens＇ surfaces were bonded to composite resin cylinders.Ni-Cr alloy specimens and PFM specimens were randomly divided into A,B groups and C,D groups respectively.Then,specimens of group B and group D were thermocycled at 5 °C to 55 °C for 5000 cycles.After that,the shear bond strengths between surfaces and resins were measured and the fracture surfaces were evaluated.Result：Group C and group D showed significant higher shear bond strength than that of group A and group B,group A had significant higher shear bond strength than that of group B,and the shear bond strength of group C didn＇t statistically show different from that of group D.Using the optical microscope,all specimens of group A and group B revealed adhesive failures,whereas those of group C and group D predominantly revealed cohesive failures in the porcelain layer.After thermocycling,SEM images showed that resin-alloy fracture surfaces had less remnants of composite resin,and resin-porcelain fracture surfaces still had lots of small embedded remnants of composite resin and separation in the porcelain layer.Conclusion：The bond strength between porcelain surfaces and resins shows significantly higher than the one between metal surfaces and resins.Simulating intra-oral thermocycling can significantly decrease the bond strengths between metal surfaces and resins.

关 键 词：冷热循环 瓷修补 粘结强度 表面 

分 类 号：R783.1[医药卫生—口腔医学]