Suwatviroj Preenan, Messer Louise B, Palamara Joseph E A
University of Melbourne, Victoria, Australia.
Pediatr Dent. 2004 Jan-Feb;26(1):67-74.
This study measured the microtensile bond strengths of 2 tooth-colored restorative materials with and without conditioning of primary teeth dentin, and examined the micromorphology of the debonded surfaces and material-dentin interfaces.
Cylindrical specimens of packable composite resin (PCR) and resin-modified glass ionomer cement (RMGIC) bonded to dentin of primary teeth were ground to an hourglass shape and tested for microtensile bond strength. The debonded surfaces and material-dentin interfaces were prepared and examined under a scanning electron microscope (SEM).
The microtensile bond strength values (mean +/- SD, in MPa) of PCR (Filtek P60 with Single Bond) and RMGIC (Fuji II LC), with or without the application of Cavity Conditioner (14.8 +/- 5.36, 12.01 +/- 4.43, 11.94 +/- 4.60, respectively), did not differ significantly (P > .05). Partial adhesive and partial cohesive failures within the restorative material predominated. The distributions of failure modes did not differ significantly between groups (P > .05). Under SEM, each material was seen to be closely adapted to dentin. Dentinal tubules were enlarged with etching, and the depth of penetration of resin tags of PCR was greater than for RMGIC. Smear plugs were incompletely removed by cavity conditioning.
The bond strength of the PCR, Filtek P60 with Single Bond, to dentin of primary teeth was comparable to that of the RMGIC, Fuji II LC. Conditioning of the cavity preparation with Cavity Conditioner did not improve the bond strength of Fuji II LC. The distribution of failure modes did not differ between materials.
本研究测量了两种牙齿颜色修复材料在有无对乳牙牙本质进行预处理情况下的微拉伸粘结强度，并检查了脱粘表面和材料 - 牙本质界面的微观形态。
将可压实复合树脂（PCR）和树脂改性玻璃离子水门汀（RMGIC）粘结到乳牙牙本质上的圆柱形标本磨成沙漏形状，并测试其微拉伸粘结强度。制备脱粘表面和材料 - 牙本质界面，并在扫描电子显微镜（SEM）下进行检查。
PCR（Filtek P60搭配Single Bond）和RMGIC（Fuji II LC）在使用或不使用窝洞调节剂的情况下，微拉伸粘结强度值（平均值±标准差，单位为MPa）分别为（14.8±5.36、12.01±4.43、11.94±4.60），差异无统计学意义（P>.05）。修复材料内部分为粘结性破坏和内聚性破坏，且以粘结性破坏为主。各实验组间破坏模式分布差异无统计学意义（P>.05）。在扫描电子显微镜下，每种材料均与牙本质紧密贴合。酸蚀后牙本质小管扩大，PCR树脂突的渗透深度大于RMGIC。窝洞预处理未能完全去除玷污层。
PCR（Filtek P60搭配Single Bond）与乳牙牙本质的粘结强度与RMGIC（Fuji II LC）相当。使用窝洞调节剂进行窝洞预处理并未提高Fuji II LC的粘结强度。不同材料的破坏模式分布无差异。
