CAJ | 학술논문

目的：评价冷热循环对Er：YAG激光以及车针备洞后牙本质与玻璃离子粘结剪切强度的影响。方法：40个离体牙分为颊舌两半，完全去除颊舌侧牙釉质，暴露牙本质后自凝塑料包埋，制成80个试件后随机分为A、B、C、D 4组（n＝20）。A组采用Er：YAG激光照射后粘结Fuji IX；B组采用Er：YAG激光照射后粘结Fuji IX，再进行12000次冷热循环；C组采用车针预备牙本质后粘结Fuji IX；D组采用车针预备牙本质后粘结Fuji IX，再进行12000次冷热循环。所有样本置于万能材料力学测试机进行剪切强度测试。结果：A、B、C组之间的剪切强度无显著差异（P＞0．05），D组剪切强度明显小于其他3组（P＜0．05）。结论：经过冷热循环之后，Er：YAG激光组的剪切强度未见明显变化，但车针备洞组的剪切强度明显降低。
목적：평개랭열순배대Er：YAG격광이급차침비동후아본질여파리리자점결전절강도적영향。방법：40개리체아분위협설량반，완전거제협설측아유질，폭로아본질후자응소료포매，제성80개시건후수궤분위A、B、C、D 4조（n＝20）。A조채용Er：YAG격광조사후점결Fuji IX；B조채용Er：YAG격광조사후점결Fuji IX，재진행12000차랭열순배；C조채용차침예비아본질후점결Fuji IX；D조채용차침예비아본질후점결Fuji IX，재진행12000차랭열순배。소유양본치우만능재료역학측시궤진행전절강도측시。결과：A、B、C조지간적전절강도무현저차이（P＞0．05），D조전절강도명현소우기타3조（P＜0．05）。결론：경과랭열순배지후，Er：YAG격광조적전절강도미견명현변화，단차침비동조적전절강도명현강저。
AIM:To study the influence of thermocycling on the shear bond strength of a glass-ionomer ce-ment to Er:YAG irradiated or bur-prepared dentin.METHODS:40 premolars were selected and the roots were re-moved.Each premolar was separated into two parts.80 samples were individually embedded in polyester resin.Sam-ples were randomly assigned into 4 groups (n=20)according to the method of cavity preparation:Er:YAG laser or bur-preparation,with or without thermocycling for 12000 times.Fuji IX was adhered to the surface of the samples in each group.The shear bond strength of samples was measured by an universal testing machine.RESULTS:The thermocy-cle had no significant effect on the shear bond strength of glass ionomer to laser-irradiated dentin (P>0.05).In bur-prepared samples,the thermocycling decreased shear bond strength value (P<0.05 ).CONCLUSION:Thermocy-cling can decrease the shear bond strength of glass-ionomer cement bonded to bur-prepared dentin.