Department of Restorative Dentistry, Recep Tayyip Erdogan University, Faculty of Dentistry, Rize, Turkey.
Department of Restorative Dentistry, Erciyes University, Faculty of Dentistry, Kayseri, Turkey.
Microsc Res Tech. 2019 Oct;82(10):1720-1727. doi: 10.1002/jemt.23337. Epub 2019 Jul 10.
This study evaluated the effects of an antioxidant application on the compromised bond strength of an adhesive to dentin bleached with 35% hydrogen peroxide. The dentin surfaces of the pulp chambers of 70 human third molars were ground, and the specimens were assigned randomly into seven groups, as follows: (a) control (unbleached); (b) bleached for 45 min, bonded immediately; (c) bleached for 45 min, treated with sodium ascorbate (SA) for 2 min, and bonded; (d) bleached for 45 min, bonded after 2 weeks; (e) bleached for 12 days, bonded immediately; (f) bleached for 12 days, treated with SA for 10 min, and bonded; and (g) bleached for 12 days, bonded after 2 weeks. In each group, the multimode adhesive was applied in etch-and-rinse and self-etch modes. The dentin surfaces were covered with a resin-based composite, and the bonded specimens were sectioned to produce composite-dentin sticks. The sticks were attached to a testing machine and subjected to a tensile force, and the representative specimens were examined via scanning electron microscopy. The bond strength was not affected by the application period of the bleaching agent. Both bleaching treatments significantly reduced the bond strength to the dentin in the self-etch or etch-and-rinse mode when compared with the control group. The bond strengths returned to normal levels with the SA applications or by waiting 2 weeks, regardless of the application period of the bleaching gel. The adhesive revealed a higher bond strength in the etch-and-rinse mode than in the self-etch mode.
本研究评估了抗氧化剂应用对 35%过氧化氢漂白后牙本质粘结强度的影响。70 个人类第三磨牙牙髓腔的牙本质表面被研磨，将标本随机分为七组，如下：（a）对照组（未漂白）；（b）漂白 45 分钟，立即粘结；（c）漂白 45 分钟，用抗坏血酸钠（SA）处理 2 分钟，然后粘结；（d）漂白 45 分钟，2 周后粘结；（e）漂白 12 天，立即粘结；（f）漂白 12 天，用 SA 处理 10 分钟，然后粘结；（g）漂白 12 天，2 周后粘结。在每组中，多模态粘结剂采用酸蚀冲洗和自酸蚀两种模式应用。用树脂基复合材料覆盖牙本质表面，将粘结标本切割成复合-牙本质棒。将棒附着在试验机上，并施加拉力，通过扫描电子显微镜检查代表性标本。漂白剂的应用期对粘结强度没有影响。与对照组相比，两种漂白处理都显著降低了自酸蚀或酸蚀冲洗模式下的牙本质粘结强度。用 SA 处理或等待 2 周，无论漂白凝胶的应用期如何，粘结强度都恢复到正常水平。在酸蚀冲洗模式下，粘结剂的粘结强度高于自酸蚀模式。
