Mousavinasab Sayed-Mostafa, Khoroushi Maryam, Moharreri Mohammadreza
Torabinejad Dental Research Center and Department of Operative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan 81746-73461, Iran.
ISRN Dent. 2012;2012:198351. doi: 10.5402/2012/198351. Epub 2012 Dec 24.
Objective. This study evaluated temperature rise of low-shrinkage (LS) self-etch primer (P), LS self-etch adhesive (A), and P90 silorane-based composite resin systems, photopolymerized under normal and artificially demineralized dentin. Methods. Forty 1.5 mm-thick dentin discs were prepared from sound human molars, half of which were demineralized. Temperature rise was measured during photopolymerization using a K-type thermocouple under the discs: 10 s and 40 s irradiation of the discs (controls/groups 1 and 2); 10 s irradiation of primer (P), 10 s irradiation of adhesive (A), 40 s irradiation of P90 without P and A, and 40 s irradiation of P90 with P and A (groups 3 to 6, resp.). The samples were photopolymerized using an LED unit under 550 mW/cm(2) light intensity. Data was analyzed using repeated measures ANOVA and paired-sample t-test (α = 0.05). Results. There were no significant differences in temperature rise means between the two dentin samples for each irradiation duration (P > 0.0001), with significant differences between the two irradiation durations (P > 0.0001). Temperature rise measured with 40 s irradiation was significantly higher than that of 10 s duration for undemineralized and demineralized dentin P < 0.0001). Conclusions. Light polymerization of P90 low-shrinkage composite resin resulted in temperature rise approaching threshold value under artificially demineralized and undemineralized dentin.
目的。本研究评估了低收缩（LS）自酸蚀底漆（P）、LS自酸蚀粘合剂（A）以及P90硅烷类复合树脂体系在正常牙本质和人工脱矿牙本质上光固化后的温度升高情况。方法。从健康人磨牙制备40个1.5毫米厚的牙本质圆盘，其中一半进行脱矿处理。在圆盘下方使用K型热电偶测量光固化过程中的温度升高：圆盘照射10秒和40秒（对照组/第1组和第2组）；底漆（P）照射10秒、粘合剂（A）照射10秒、不使用P和A照射P90 40秒以及使用P和A照射P90 40秒（分别为第3组至第6组）。使用LED装置在550 mW/cm²光强度下对样品进行光固化。数据采用重复测量方差分析和配对样本t检验进行分析（α = 0.05）。结果。在每个照射持续时间下，两种牙本质样品之间的温度升高平均值无显著差异（P > 0.0001），而两个照射持续时间之间存在显著差异（P > 0.0001）。对于未脱矿和脱矿牙本质，40秒照射时测量的温度升高显著高于10秒照射时的温度升高（P < 0.0001）。结论。在人工脱矿和未脱矿牙本质下，P90低收缩复合树脂的光聚合导致温度升高接近阈值。
