Uno S, Asmussen E
School of Dentistry, Hokkaido University, Sapporo, Japan.
Scand J Dent Res. 1991 Oct;99(5):440-4. doi: 10.1111/j.1600-0722.1991.tb01052.x.
The aim of this study was to investigate the effect of reduced rate of polymerization on the marginal adaptation of a composite resin inserted in dentin cavities treated with a simplified Gluma system. The effect on bonding strength to dentin and compressive strength was also investigated. The light intensity of the polymerization unit was lowered by the use of a transformer, and thus the rate of polymerization of the composite resin. When the resin was irradiated for 30 s at 110 V followed by 30 s at 220 V, the marginal adaptation was significantly improved. This condition resulted in acceptable values of bonding strength to dentin and diametral compressive strength. It is suggested that the reduced rate of polymerization may allow for increased flow of the material, decreasing the contraction stress in the filling.
本研究的目的是调查聚合速率降低对用简化型Gluma系统处理的牙本质窝洞中所植入复合树脂边缘适应性的影响。同时还研究了对牙本质粘结强度和抗压强度的影响。通过使用变压器降低聚合单元的光强度，从而降低复合树脂的聚合速率。当树脂在110V下照射30s，然后在220V下照射30s时，边缘适应性显著提高。这种情况导致牙本质粘结强度和直径抗压强度的值可以接受。有人认为，聚合速率降低可能会使材料的流动性增加，从而降低充填物中的收缩应力。
