摘要
目的扫描电镜下观察比较3种树脂充填材料在修复牙体窝洞后其边缘微渗漏的差异。方法选择42颗离体第三磨牙,在合页面预备出4mm×4mm×3mm方形洞型,用35%磷酸涂布牙釉质面30s,冲洗10s吹干,均匀涂布3M第7代自酸蚀粘接剂于整个窝洞,来回涂擦20s,用柔风吹匀,光照20s。将42颗离体牙随机分为3组,分别为A、B和C组,每组14颗。其中A组用SDR大体积树脂不分层一次充填完成,B组用3M P60复合树脂、C组用3M Z350XT流动纳米复合树脂均采用分层充填窝洞,分别记录复合树脂充填修复窝洞的整个操作时间。3组样本经人工唾液浸泡,冷热循环老化试验后,扫描电镜下观察充填体与牙体组织在牙釉质与牙本质边缘发生微渗漏的情况并测量其裂隙值。结果在牙本质层可见:SDR大体积充填树脂与牙本质组织之间微缝隙的宽度较小,与其余2组相比差异有统计学意义(P<0.05),SDR大体积树脂在牙本质层展现出了较好的边缘封闭效果。在牙釉质层可见:3组树脂充填体边缘微渗漏的宽度存在差异(P<0.05);LSD-t检验表明,3M P60复合树脂与牙体组织之间微缝隙的宽度较大,与其余2组有差异(P<0.05),但SDR树脂组和3M Z350XT流动纳米树脂组相比较差异无统计学意义(P=0.466)。结论本研究证实SDR大体积树脂与牙本质有更好的密合性,与3M P60复合树脂和3M Z350XT流动纳米复合树脂相比较更适合用于牙本质层的修复。
Objective To evaluate the impact of three filling materials on microleakage under the Scanning Electron Microscope(SEM).Methords 42 isolated teeth of the third molar teeth were prepared for 4 mm×4 mm×3 mm cavities on the occlusal surface for each,applying the self-etching with 3 M Easy One to the cavities to achieve the ideal curing effect.Then they were randomly divided into 3 groups of 14 samples.A group was filled with SDR replacement in one effort.B group were filled with 3M P60 Poterior Restorative and C group with 3M Z350 XT restorative layering in two times.All specimens were placed in artificial saliva and thermocycled.The microleakage between the resin and the teeth under SEM were observed.Results In dentin layer:SDR showed the least microleakage and the better marginal microleakage among them with statistical significance to P60 and Z350XT.In enamal layer:three filling materials exist statistical significance(P <0.05);further by LSD-t test,it showed that P60 has the lagest microleakage among them,SDR and Z350XT have statistical significance with P60(P <0.05),however SDR and Z350XT have no statistical significance(P =0.466).Conclusion This study confirmed that SDR resin,compared with 3M P60 and 3M Z350XT flowable resin,is a better suitable dentin filling material which has better marginal microleakage.
出处
《新疆医科大学学报》
CAS
2017年第12期1540-1543,共4页
Journal of Xinjiang Medical University
基金
新疆维吾尔自治区自然科学基金(2015211C111)
关键词
微渗漏
扫描电镜
复合树脂
microleakage
scanning electron microscope
composite resins
