Korkmaz Yonca, Attar Nuray
Department of Conservative Dentistry, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
J Contemp Dent Pract. 2007 Jul 1;8(5):34-42.
The purpose of this study was to investigate the effect of light-emitting diode (LED) light curing units (LCUs) compared with halogen LCUs on the shear bond strength (SBS) of one nanofill composite (Filtek Supreme) and one microhibrid composite (Artemis) with self-etch adhesives.
The buccal surfaces of 60 non-carious extracted human molars were flattened to expose dentin and, subsequently, polished for 60 seconds with 600-grit wet silicon carbide abrasive paper. Specimens were assigned into six groups (n=10) according to composite material, self-etch adhesive, and curing light used as follows: Group 1: Adper Prompt L-Pop (AP) and Filtek Supreme (FS) using an Elipar Free Light (EFL); Group 2: AP and FS using an Elipar Free Light 2 (EFL2); Group 3: AP and FS using a Hilux Expert (HE) light, Group 4: AdheSE (AS)+Artemis (AR) using an EFL; Group 5: AS+AR using an EFL2; and Group 6: AS+AR using a HE light. The specimens were thermocycled for 500 cycles (5 masculineC-55 masculineC) and then loaded to failure in a Zwick universal testing machine at a crosshead speed of 5 mm/minute. SBS values were calculated as megapascals (MPa) and statistically analyzed using the one-way analysis of variance (ANOVA) test at a significance level of 0.05.
Mean SBS (+/- standard deviations) values were as follows: Group1: 15.99+/-5.18; Group 2: 18.76+/-6.71; Group 3: 17.70+/-5.04; Group 4: 16.93+/-3.99; Group 5: 18.01+/-5.19, and Group 6: 17.46+/-5.40. There were no statistically significant differences for SBS to dentin among the groups tested.
The LED curing lights used in the study seem to be comparable with the halogen curing light for nanofill and microhybrid composites used in conjunction with self-etching systems in dentin. The EFL2 reduces curing time, which can be considered as an advantage.
本研究旨在调查发光二极管（LED）光固化机与卤素光固化机相比，对一种纳米填料复合树脂（Filtek Supreme）和一种微混合复合树脂（Artemis）与自酸蚀粘结剂之间的剪切粘结强度（SBS）的影响。
将60颗非龋性拔除的人类磨牙的颊面磨平以暴露牙本质，随后用600目湿碳化硅砂纸打磨60秒。根据复合材料、自酸蚀粘结剂和使用的固化光，将标本分为六组（n = 10），如下所示：第1组：使用Elipar Free Light（EFL）的Adper Prompt L-Pop（AP）和Filtek Supreme（FS）；第2组：使用Elipar Free Light 2（EFL2）的AP和FS；第3组：使用Hilux Expert（HE）光的AP和FS；第4组：使用EFL的AdheSE（AS）+Artemis（AR）；第5组：使用EFL2的AS+AR；第6组：使用HE光的AS+AR。将标本进行500次热循环（5℃-55℃），然后在Zwick万能试验机上以5毫米/分钟的十字头速度加载直至破坏。SBS值以兆帕（MPa）计算，并使用单因素方差分析（ANOVA）进行统计学分析，显著性水平为0.05。
平均SBS（±标准差）值如下：第1组：15.99±5.18；第2组：18.76±6.71；第3组：17.70±5.04；第4组：16.93±3.99；第5组：18.01±5.19；第6组：17.46±5.40。在测试的各组中，与牙本质的SBS没有统计学上的显著差异。
本研究中使用的LED固化光似乎与卤素固化光在与牙本质自酸蚀系统联合使用时对纳米填料和微混合复合树脂的效果相当。EFL2缩短了固化时间，这可被视为一个优点。
