Yadav Suman, Yadav Harish
Department of Conservative Dentistry and Endodontics, SGT Dental College, Gurgaon, Haryana, India.
J Conserv Dent. 2013 Mar;16(2):148-51. doi: 10.4103/0972-0707.108198.
This study evaluated the effect of ionizing radiations on resin-dentin interface in terms of marginal adaptation and micro-tensile bond strength under thermocycling and mechanical loading.
Forty extracted human mandibular third molars were divided into four groups. GR I: No Irradiation and Class II MO cavities were prepared that were restored with composite restorations; GR II: Teeth were irradiated and restored; GR III: Teeth were restored and irradiated; GR IV: Teeth were restored during irradiation dosage fractions. All samples were thermal and mechanical loaded with 5000 cycles, 5 ± 2-55 ± 2°C, dwell time 30 s and 150,000 cycles at 60N. Resin-dentin slabs were trimmed into dumbbell-shaped slabs and microtensile bond strength was measured. The bond strength data was analyzed by one-way analysis of variance test.
Irradiation before tooth preparation deteriorated the microtensile bond strength.
本研究评估了在热循环和机械加载条件下，电离辐射对树脂-牙本质界面的边缘适应性和微拉伸粘结强度的影响。
将40颗拔除的人类下颌第三磨牙分为四组。第一组（GR I）：未进行辐照，制备II类MO洞型并用复合树脂修复；第二组（GR II）：牙齿先辐照后修复；第三组（GR III）：牙齿先修复后辐照；第四组（GR IV）：在分次辐照剂量期间进行修复。所有样本在5±2-55±2°C下进行5000次热循环和机械加载，保压时间30秒，并在60N下进行150,000次循环。将树脂-牙本质板修整成哑铃形板并测量微拉伸粘结强度。粘结强度数据通过单因素方差分析进行分析。
牙体预备前进行辐照会降低微拉伸粘结强度。
