Raadal M
Scand J Dent Res. 1979 Oct;87(5):390-4. doi: 10.1111/j.1600-0722.1979.tb00698.x.
The purpose of this study was to evaluate the microleakage around preventive composite fillings in teeth subjected to mechanical loading and thermal cycling, and to assess the influence of the consistency of the composite resin upon the leakage. The fissure enamel was partially removed without dentin exposure in 30 extracted maxillary pre-molars. The cavities were etched with phosphoric acid and filled with undiluted composite (Adaptic) or composite diluted with varying amounts of liquid resin (Adaptic Bonding Agent). Five teeth were not acid etched and served as a control group. All teeth were mechanically loaded and unloaded, simulating masticatory forces, and subsequently thermally cycled between two dye solutions. Extensive leakage was seen around all fillings in the control group, while slight leakage, restricted to the feather-edge margin, was seen in five teeth with acid etched cavities. Three of these contained undiluted composite fillings. Twenty teeth showed no leakage. The results show that preventive composite filling provides good sealing of occlusal fissures, and that the seal is resistant to those thermal and mechanical stresses which may be expected in vivo. The use of diluted composite resin in preventive composite fillings is recommended.
本研究的目的是评估承受机械负荷和热循环的牙齿中预防性复合充填物周围的微渗漏情况，并评估复合树脂的稠度对渗漏的影响。在30颗拔除的上颌前磨牙中，部分去除裂隙釉质而不暴露牙本质。用磷酸蚀刻窝洞，并用未稀释的复合树脂（Adaptic）或用不同量液体树脂稀释的复合树脂（Adaptic粘结剂）进行充填。5颗牙齿未进行酸蚀，作为对照组。所有牙齿均进行模拟咀嚼力的机械加载和卸载，随后在两种染料溶液之间进行热循环。对照组所有充填物周围均出现广泛渗漏，而在5颗酸蚀窝洞的牙齿中，仅在羽状边缘出现轻微渗漏。其中3颗含有未稀释的复合树脂充填物。20颗牙齿未出现渗漏。结果表明，预防性复合充填能很好地封闭咬合裂隙，且这种封闭对体内可能出现的热应力和机械应力具有抵抗力。建议在预防性复合充填中使用稀释的复合树脂。
