复合树脂核材料与牙本质黏结强度的实验研究

目的比较使用3种不同牙本质黏结剂时,2种复合树脂核材料与精细粒度车针预备的牙本质之间的微拉伸黏结强度。方法本实验使用的2种复合树脂核材料为Bisfil-core和Luxacore,3种黏结剂为ONE-STEPRPLUS、Contax和ibond,各对应的组别为BO组、LO组、BC组、LC组、Bi组和Li组。18颗人类磨牙用于本实验,每组3颗牙齿。所有牙齿均去除冠部釉质,暴露出完整的表浅牙本质,并用精细粒度金钢砂车针预备牙本质。然后按照各厂家的说明完成黏结剂的应用并用2种核材料分别修复牙冠。牙齿在37℃的自来水中保存24 h后,沿与黏结面垂直的方向片切成厚约0.7 mm的薄片,然后修整黏结面,使其面积大约在1.0 mm2。样本在MTS Synergie100材料测试机上进行黏结强度测试,所得数据用方差分析和LSD检验进行统计学处理。结果各组的黏结强度分别为BO组(27.34±6.52)MPa、LO组(36.49±11.74)MPa、BC组(23.78±9.03)MPa、LC组(34.35±13.35)MPa、Bi组(29.12±7.99)MPa、Li组(32.63±8.17)MPa。统计学分析显示,黏结强度的差异在不同黏结剂之间无统计学意义,在不同的核材料之间差异有统计学意义。结论 3种黏结剂均可以满足临床需要,流动性复合树脂核材料可以显著提高黏结强度。

Experimental study of bonding strength between resin composite direct core build-up materials and dentin in vitro

Objective To compare the microtensile bonding strength between two resin composite direct core build-up materials and dentin prepared with a superfine-grit diamond bur when using three different dentin adhesives.Methods Two kinds of resin composite core build-up materials,Bisfil-core and Luxacore,and three kinds of adhesives,ONE-STEP○RPLUS,Contax and ibond,were used in this study.The six corresponding groups were BO,LO,BC,LC,Bi,Li,respectively.Eighteen human molarswere randomly divided into six groups with three teeth in each group in this study.The coronal enamel of all teeth was removed and the superficial dentin was exposed,which were then prepared with a superfine-grit diamond bur.The dentin adhesives were applied to dentin surface according to manufacturers’ instructions.The teeth were then restored with two resin composite direct core build-up materials and stored in tap water at 370C for 24 hours.After that,the teeth were sectioned perpendicular to the bonded surface into slices approximately 0.7mm thickness.Each slice was then trimmed into an hourglass shape to provide a 1.0 mm2 bonded area.The specimens were subjected to microtensile bond strength testing on MTS Synergie100 testing machine.Data were analyzed by ANOVA and LSD test.Results Bonding strength of each group as follows: BO(927.34±6.52)MPa,LO(36.49±11.74) MPa,BC(23.78±9.03)MPa,LC(34.35±13.35)MPa,Bi(29.12±7.99)MPa,Li(32.63±8.17)MPa.The difference is not significant in dentin adhesives but significant in resin composite direct core build-up materials.Conclusion All three dentin adhesives can meet the demand of clinical practice.A flowable resin composite core material can enhance the bonding strength significantly.