Bruschi Alonso Roberta Caroline, Carvalho de Souza-Júnior Eduardo José, Dressano Diogo, Spagnolo de Araújo Giovana Albamonte, Ces Rodriguez José Manuel, Hipólito Vinícius Di, Anauate-Netto Camillo, Puppin-Rontani Regina Maria, Coelho Sinhoreti Mario Alexandre
Biomaterials, Bandeirante Anhanguera University (UNIBAN), Rua, Maria Candida, 1813 - Bloco G - 6° Andar, São Paulo, SP, Brazil.
Department of Restorative Dentistry, Dental Materials, Piracicaba Dental School (Fop-Unicamp), Avenida Limeira, 901 Piracicaba, SP, Brazil.
Eur J Dent. 2013 Sep;7(Suppl 1):S001-S008. doi: 10.4103/1305-7456.119056.
The aim of this study was to evaluate the influence of photoinitiator concentration on marginal and internal adaptation of composites photocured by modulated methods.
Composites based on BisGMA/triethylene glycol dimethacrylate and 65 wt% of filler were prepared with different concentrations of camphorquinone/amine (C1-0.5%, C2-1%, C3-1.5%). Cavities were prepared (3 mm × 3 mm × 2 mm) on the buccal surface of 120 bovine incisors and the adhesive system Adper Single Bond 2 was applied following manufactures instruction. Specimens were then distributed according to type of composite (C1, C2, C3) and photoactivation method (high-intensity - 750 mW/cm(2) for 40 s; low intensity - 150 mW/cm(2) for 200 s; soft-start - 150 mW/cm(2) for 10 s + 750 mW/cm(2) for 38 s; pulse-delay - 150 mW/cm(2) for 10 s + 3 min dark + 750 mW/cm(2) for 38 s). Superficial and internal margins were analyzed by scanning electron microscopy, using the epoxy replica technique. The length of gaps was expressed as a percentage of the total length of the margins. Data were submitted to two-way analysis of variance and Tukey's test (α =0.05).
Modulated curing methods did not influence gap formation regarding both superficial and internal adaptation. The composite with the lower initiator concentration (C1) presented higher gap formation when compared with those with higher concentrations (C2 and C3).
Modulated photoactivation methods did not reduce gap formation for the experimental composite restorations evaluated. However, higher photoinitiator concentrations promote better marginal seal.
本研究旨在评估光引发剂浓度对采用调制方法光固化的复合材料边缘适应性和内部适应性的影响。
制备基于双甲基丙烯酸缩水甘油酯/三乙二醇二甲基丙烯酸酯且填料含量为65 wt%的复合材料，其中樟脑醌/胺的浓度不同（C1 - 0.5%，C2 - 1%，C3 - 1.5%）。在120颗牛切牙的颊面制备窝洞（3 mm×3 mm×2 mm），按照制造商说明应用Adper Single Bond 2粘结系统。然后根据复合材料类型（C1、C2、C3）和光活化方法（高强度 - 750 mW/cm² 照射40 s；低强度 - 150 mW/cm² 照射200 s；软启动 - 150 mW/cm² 照射10 s + 750 mW/cm² 照射38 s；脉冲延迟 - 150 mW/cm² 照射10 s + 3分钟暗期 + 750 mW/cm² 照射38 s）对样本进行分组。采用环氧树脂复型技术，通过扫描电子显微镜分析表面和内部边缘。间隙长度以边缘总长度的百分比表示。数据进行双向方差分析和Tukey检验（α = 0.05）。
调制固化方法在表面和内部适应性方面均未影响间隙形成。与较高浓度（C2和C3）的复合材料相比，引发剂浓度较低（C1）的复合材料间隙形成更多。
对于所评估的实验性复合树脂修复体，调制光活化方法并未减少间隙形成。然而，较高的光引发剂浓度可促进更好的边缘封闭。
