不同酸蚀粘接系统对流动树脂行窝沟封闭的影响

The influence of different etching adhesive systems on flowable resin used as pit and fissure sealant

目的:探讨不同酸蚀粘接系统对流动树脂行窝沟封闭的影响。方法:60颗离体牙随机分为4组(n=15):A组(Gluma、NT、3M Z350流动树脂),B组(ClearFil SE Bond、3M Z350流动树脂),C组(Gluma、3M Z350流动树脂),D组(Gluma、3M concise封闭剂)。处理牙面后封闭窝沟(n=10),1%次甲基蓝染色观察边缘微渗漏(n=8),扫描电镜下观察材料-釉质界面的形态学改变(n=2)。牙齿(n=5)近中或远中面用相应材料处理后堆积成直径3 mm、高3 mm的圆柱测试材料与牙面间的剪切粘接强度。制备直径4 mm、高4 mm的窝沟封闭剂和流动树脂圆柱各10个,测试其抗压强度。结果:4组微渗漏情况差异无显著性。电镜观察A组界面树脂突长且密集,B组界面树脂突较短而稀疏,2组局部皆有气泡、裂隙;C组树脂突长而稀疏,与牙体组织结合紧密;D组树脂突短而密集;4组在窝沟底部渗透均较差。A组剪切粘接强度最高(P<0.01),C组高于B组和D组(P<0.05),B组和D组间差异无显著性(P>0.05)。流动树脂抗压强度高于封闭剂(P<0.05)。结论:全酸蚀粘接系统处理组和酸蚀后直接结合流动树脂组的剪切粘接强度和抗压强度优于自酸蚀粘接系统处理组和传统封闭剂组殷蚀后使用NT粘接可提高其剪切粘接强度和抗压强度。

Objective：To evaluate the effects of the flowable resin used as pit and fissure sealant using different etching adhesive systems.Methods：60 caries-free extracted human premolars were randomly divided into 4 groups（n = 15） and treated by Gluma,NT and 3M-Z350 flowable resin（group A）;Clearifil SE Bond adhesive and 3M-Z350 flowable resin（group B）,phosphoric acid etching,3M-Z350 flowable resin and phosphoric acid etching（group C） and 3M concise sealant（group D） respectively.After processing the tooth surface the pit and fissue of 10 sample in each group were sealed.The microleakage was measured by 1%methylene blue staining（n =8）.The material-enamel interface was observed by SEM（n =2）.The shear bond strength of the columnshaped samples with the diameter and the height of 3 mm（n = 5） on the mesial or dental surface was examined by a test machine.The sealant cartridges and flowable resin cartridges with the diameter and height of 4 mm were used for the crushing strength examination（n = 10）.Results：There was no significant difference in the microleakage among the 4 groups.SEM observation showed that the resin tags of group A were long and dense and the resin tags of group B were short and sparse,bubbles and cracks were found on the local site in group A and B.The resin tags of group C were long and thin,but combined with tooth tightly;the resin tags of group D were short and dense;the penetration was poor at the bottom of the fissures in the 4 groups.The shear bond strength of Group A was the highest（P〈0.01）,that of group C was higher than that of group B and D（P〈0.05）.There was no significantly difference between group B and D（P〉0.05）.The compressive strength of flowable resin groups was higher than that of fissure sealant group（P〈0.05）.Conclusion：The shear bond strength and compressive strength of all-etching bonding system combined with flowable resin is superior to that of self-etching bonding system combined with flowable resin and the traditional sealant.Using PrimeBond NT bond after acid etching may improve the shear bonding strength.