大块充填树脂与牙本质粘接强度、耐久性及微渗漏的研究

Study on bonding strength, aging resistance, and microleakage of bulk filling resins and dentin

目的评价不同大块充填树脂和牙本质之间粘接强度、耐老化性及微渗漏。方法选取符合纳入标准的磨牙140颗(来源于中国康复研究中心口腔科),其中120颗磨除牙颌面釉质,暴露牙本质层,涂布粘接剂,采用随机数字表法分成A、B、C、D四组,每组30颗。用3种大块树脂FiltekTM Bulk Fill(A组),VOCO X-tra Bulk Fill(B组),SureFil SDR(C组)一次充填,Filtek Z350传统树脂(D组)分层充填。随机数字表法将四组分为两个亚组,各15颗。第一亚组在充填完成后,即老化前;另一亚组进行10000次温度循环老化,即老化后,进行剪切强度测试。应用单因素方差分析比较不同树脂材料间及老化前后粘接强度的差异。剩余20颗磨牙制备深4 mmⅠ类洞型,每组5颗,充填并老化后浸泡至2%亚甲基染料中24 h,切成1 mm薄片,体式显微镜下观察充填体边缘染料渗入情况。结果老化前,C组粘接强度高于A、B、D组,差异有统计学意义(P<0.05);老化后,各组粘接强度较老化前均下降,C组粘接强度高于A、B、D组,差异有统计学意义(P<0.05)。各组界面微渗漏评分比较,差异无统计学意义(P>0.05)。结论低黏度树脂SDR在实验中有良好表现,能达到比传统纳米树脂更好的粘接效果。

Objective To evaluate the bonding strength,aging resistance,and microleakage between different bulk filling resins and dentin.Methods A total of 140 unified vitro molars were chosen(from Department of Stomatology in China Rehabilitation Research Center),120 of which had their dentin layer revealed and covered with adhesives.They were divided into four groups by random number table method,with 30 cases in each group.The four groups were whole filled with FiltekTM Bulk Fill resin(group A),X-tra Bulk Fill resin(group B),SureFil SDR flowable resin(group C),and stratified filled with Filtek Z350 conventional resin(group D),the four groups were divided into two subgroups by random number table method,with 15 cases in each group.The first subgroup was after filling,that was before aging;the other subgroup underwent 10000 temperature cycles of aging,that was after aging,shear strength tests were performed.The difference of bonding strength between different resin materials and before and after aging was compared by single factor analysis of variance.The remaining 20 molars were prepared into a ClassⅠcavity with a depth of 4 mm,with five molars in each group,filled and aged,soaked in 2%methylene dye for 24 h,cut into 1 mm slices,and the dye infiltration at the edge of the filling body was observed under a type microscope.Results Before aging,the bonding strength of group C was higher than that of groups A,B,and D,and the differences were statistically significant(P<0.05).After aging,the bond strength of all groups decreased compared with that before aging,and the bond strength of group C was higher than that of groups A,B,and D,the differences were statistically significant(P<0.05).There was no significant difference in interface microleakage scores among all groups(P>0.05).Conclusion SDR with low viscosity performed well in the trial,having a better bonding effect than conventional resin.