Araújo Tatiany Gabrielle Freire, Sfalcin Ravana Angelini, de Araújo Giovana Spagnolo Albamonte, Alonso Roberta Caroline Brusch, Puppin-Rontani Regina Maria
J Adhes Dent. 2015 Apr;17(2):117-23. doi: 10.3290/j.jad.a33972.
To evaluate the effect of different concentrations of monomers and solvents/diluents on the microtensile bond strength (μTBS) bond strength of experimental low-viscosity resins (infiltrants) to enamel caries-like lesions (ECLL).
Flat enamel blocks obtained from sound human third molars were submitted to ECLL formation and randomly distributed into 9 groups (n = 10): G1: TEG-DMA 100%; G2: TEG-DMA 80%, ethanol 20%; G3; TEG-DMA 80%, HEMA 20%; G4: TEG-DMA 75%, UDMA 25%; G5: TEG-DMA 60%, UDMA 20%, ethanol 20%; G6: TEG-DMA 60%, UDMA 20%, HEMA 20%; G7: TEG-DMA 75%, bis-EMA 25%; G8: TEG-DMA 60%, bis-EMA 20%, ethanol 20%; G9: TEG-DMA 60%, bis-EMA 20%, HEMA 20%. After etching with 37% phosphoric acid for 60 s, experimental infiltrants were actively applied and photocured for 60 s, then stored in 100% humidity (24 h, 37°C). Hourglass-shaped specimens were obtained and the μTBS test performed (MPa). The fracture patterns were assessed by SEM. Data were submitted to two way-ANOVA and Tukey's tests (α = 0.05).
The highest μTBS value was observed for G4 (TEG-DMA/UDMA, 19.18 MPa) and the lowest for G5 (TEG-DMA/UDMA/ethanol, 9.00 MPa). A significant decrease in μTBS was observed for all groups containing ethanol (G2, G5, and G8). The addition of HEMA did not affect μTBS values. Most groups showed a high frequency of mixed failure between infiltrant and enamel.
The addition of bis-EMA or UDMA to TEG-DMA-based infiltrants did not improve bond strength to carious enamel. The ethanol addition negatively affected the bonding strength of infiltrants to enamel caries-like lesions, regardless of the resin matrix composition of the infiltrant.
评估不同浓度的单体以及溶剂/稀释剂对实验性低粘度树脂（渗透剂）与类龋釉质病变（ECLL）之间微拉伸粘结强度（μTBS）的影响。
从健康人第三磨牙获取的扁平釉质块制成类龋釉质病变，随机分为9组（n = 10）：G1：100% 三乙二醇二甲基丙烯酸酯（TEG-DMA）；G2：80% TEG-DMA，20% 乙醇；G3：80% TEG-DMA，20% 甲基丙烯酸羟乙酯（HEMA）；G4：75% TEG-DMA，25% 超分散多官能团丙烯酸酯（UDMA）；G5：60% TEG-DMA，20% UDMA，20% 乙醇；G6：60% TEG-DMA，20% UDMA，20% HEMA；G7：75% TEG-DMA，25% 双甲基丙烯酸乙二醇酯（bis-EMA）；G8：60% TEG-DMA，20% bis-EMA，20% 乙醇；G9：60% TEG-DMA，20% bis-EMA，20% HEMA。用37% 磷酸酸蚀60秒后，主动施加实验性渗透剂并光固化60秒，然后置于100% 湿度环境（37°C，24小时）。制备沙漏形试件并进行微拉伸粘结强度测试（MPa）。通过扫描电子显微镜评估断裂模式。数据进行双向方差分析和Tukey检验（α = 0.05）。
G4组（TEG-DMA/UDMA，19.18 MPa）的微拉伸粘结强度值最高，G5组（TEG-DMA/UDMA/乙醇，9.00 MPa）最低。所有含乙醇的组（G2、G5和G8）微拉伸粘结强度均显著降低。添加HEMA对微拉伸粘结强度值无影响。大多数组在渗透剂与釉质之间呈现较高频率的混合性破坏。
在基于TEG-DMA的渗透剂中添加bis-EMA或UDMA并不能提高与龋损釉质的粘结强度。添加乙醇会对渗透剂与类龋釉质病变的粘结强度产生负面影响，无论渗透剂的树脂基质成分如何。
