Gwinnett A J
Department of Oral Biology & Pathology, SUNY at Stony Brook, Stony Brook, NY 11794.
Am J Dent. 1993 Feb;6(1):7-9.
This study determined, quantitatively, the role of resin infiltration in dentin bonding. Four groups contained 10 molar teeth. Thirty were sectioned in the mid-coronal region and the dentin ground flat with 600 grit silicon carbide paper. Group 1: smear layer intact; Group 2: smear layer removed with a Prophy Jet; Group 3: conditioned with 10% H3PO4 for 20 seconds; Group 4: comprised dentin exposed by a transverse, mid-coronal fracture. Dentin surfaces were treated with All-Bond 2, its companion bonding agent, followed by P50 resin composite, polymerized in 1 mm increments. After storage in water at 37 degrees C for 24 hours, the assemblies were tested to failure in a shear mode at a crosshead speed of 5 mm/minute. Surface and interfacial morphology was characterized using SEM. Values in MPa were: Group 1: 10.24 +/- 2.98; Group 2: 20.37 +/- 4.62; Group 3: 32.68 +/- 7.12; and Group 4: 26.77 +/- 4.85. ANOVA and student t-test showed the means statistically different (P < 0.05). Since resin penetration was only found appreciably in dentin tubules in Group 4 and tubular and intertubular penetration in Group 3, it was concluded that resin infiltration can contribute approximately one third of the shear bond strength of this total etch system.
本研究定量确定了树脂渗透在牙本质粘结中的作用。四组各含10颗磨牙。将30颗牙齿在牙冠中部区域进行切片，并用600目碳化硅砂纸将牙本质磨平。第1组：玷污层完整；第2组：用Prophy Jet去除玷污层；第3组：用10%磷酸处理20秒；第4组：包括因牙冠中部横向骨折而暴露的牙本质。牙本质表面先用全粘结剂2及其配套粘结剂处理，然后用P50树脂复合材料，以1毫米的增量进行聚合。在37℃水中储存24小时后，以5毫米/分钟的十字头速度在剪切模式下对组件进行破坏测试。使用扫描电子显微镜对表面和界面形态进行表征。以兆帕为单位的值为：第1组：10.24±2.98；第2组：20.37±4.62；第3组：32.68±7.12；第4组：26.77±4.85。方差分析和学生t检验表明均值具有统计学差异（P<0.05）。由于仅在第4组的牙本质小管中以及第3组的小管和管间区域发现了明显的树脂渗透，因此得出结论，树脂渗透可为此全酸蚀系统的剪切粘结强度贡献约三分之一。
