Tiwari Anil, Shyagali Tarulatha, Kohli Sarvraj, Joshi Rishi, Gupta Abhishek, Tiwari Rana
Department of Orthodontics and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, MP, India.
Acta Inform Med. 2016 Oct;24(5):317-321. doi: 10.5455/aim.2016.24.317-321. Epub 2016 Nov 1.
The aim of this in vitro study was to evaluate the influence of the Dental chair light on the bond strength of light cured composite resin.
Sixty therapeutically extracted human premolar teeth were randomly allocated to two groups of 30 specimens each. In both groups light cured composite resin (Transbond XT) and MBT premolar metal brackets (3M Unitek) was used to bond brackets. In group I and II light curing was done using Light-emitting diode light curing units without and with the dental chair light respectively. After bonding, all samples were stored in distilled water at room temperature for 24 hours and subsequently tested for shear bond strength and Adhesive Remnant Index (ARI) scores. Data was subjected to Mann Whitney U statistical test.
Results indicated that there was significantly higher shear bond strength (7.71 ± 1.90) for the Group II (composite cured with LED and dental chair light) compared with Group I (composite cured with LED LCU only) (5.74 ± 1.13).the obtained difference was statistically significant. There was no statistical significant difference between ARI scores in between the groups.
light cure bonding with dental chair light switched on will produce greater bond strength than the conventional bonding. However, the ARI score were similar to both the groups. It is advised that the inexperienced orthodontist should always switch off the dental chair light while bonding for enough working time during the bracket placement.
本体外研究旨在评估牙科椅灯光对光固化复合树脂粘结强度的影响。
将60颗治疗性拔除的人类前磨牙随机分为两组，每组30个样本。两组均使用光固化复合树脂（Transbond XT）和MBT前磨牙金属托槽（3M Unitek）粘结托槽。第一组和第二组分别使用无牙科椅灯光和有牙科椅灯光的发光二极管光固化装置进行光固化。粘结后，所有样本在室温下于蒸馏水中保存24小时，随后测试剪切粘结强度和粘结剂残留指数（ARI）评分。数据进行曼-惠特尼U统计检验。
结果表明，第二组（用发光二极管和牙科椅灯光固化复合树脂）的剪切粘结强度（7.71±1.90）显著高于第一组（仅用发光二极管光固化装置固化复合树脂）（5.74±1.13）。所获得的差异具有统计学意义。两组之间的ARI评分无统计学显著差异。
打开牙科椅灯光进行光固化粘结比传统粘结产生更大的粘结强度。然而，两组的ARI评分相似。建议经验不足的正畸医生在放置托槽期间进行粘结且有足够工作时间时，应始终关闭牙科椅灯光。
