Cobb D S, Vargas M A, Rundle T
Department of Operative Dentistry, College of Dentistry, University of Iowa, Iowa City 52242-1001, USA.
Am J Dent. 1996 Oct;9(5):199-202.
To evaluate and compare diametral tensile strength (DTS), compressive strength (CS) and flexural strength (FS) of a hybrid and a microfill resin composite restorative material polymerized by an argon laser for 10 seconds (AL10) and 20 seconds (AL20) vs. a conventional visible light for 40 seconds (VL40).
Five specimens of resin composite, Herculite XRV, shade A-2 and Durafill VS, shade B-2, were made for each set of physical properties tested, for a total of 18 groups and 90 specimens. ANSI/ADA Specification #27 for direct filling resins was used as the protocol for specimen preparation and physical properties testing. An argon laser at approximately 285 mW, 6 mm beam size, power density of approximately 1,000 mW/cm2, and a conventional visible light at approximately 470 mW, 13 mm beam size, power density of approximately 354 mW/cm2, were used to polymerize the composite. Samples were stored in water in light-proof containers at 37 degrees C for at least 7 days and then tested on a Zwick universal testing machine. Mean DTS, CS or FS (MPa) values were calculated for each group.
Herculite XRV's physical properties were not significantly affected by light source or exposure time. Light source or exposure time had no significant effect on DTS for Durafill VS. Significantly lower FS was found for Durafill VS, when cured for 10 seconds with the argon laser compared to 20 seconds with the laser or 40 seconds with the conventional light. In addition, significantly lower CS was found for the Durafill VS when polymerized with the laser at 10 seconds compared to the conventional light at 40 seconds.
评估并比较一种混合型和一种微填料树脂复合修复材料，通过氩激光聚合10秒（AL10）和20秒（AL20）与通过传统可见光聚合40秒（VL40）后的径向拉伸强度（DTS）、抗压强度（CS）和弯曲强度（FS）。
针对每组测试的物理性能，制备了5个树脂复合材料样本，分别是色号为A-2的Herculite XRV和色号为B-2的Durafill VS，共18组90个样本。采用ANSI/ADA直接填充树脂规范#27作为样本制备和物理性能测试的方案。使用功率约285 mW、光束尺寸6 mm、功率密度约1000 mW/cm²的氩激光，以及功率约470 mW、光束尺寸13 mm、功率密度约354 mW/cm²的传统可见光来聚合复合材料。样本在37摄氏度的水中，置于不透光容器中储存至少7天，然后在Zwick万能试验机上进行测试。计算每组的平均DTS、CS或FS（MPa）值。
Herculite XRV的物理性能不受光源或照射时间的显著影响。光源或照射时间对Durafill VS的DTS没有显著影响。与激光照射20秒或传统光照射40秒相比，Durafill VS用氩激光照射10秒固化时，其FS显著更低。此外，与传统光照射40秒相比，Durafill VS用激光照射10秒聚合时，其CS显著更低。
