Türkün M, Türkün L S
Department of Restorative Dentistry and Endodontics, School of Dentistry, Ege University, Izmir, Turkey.
Int Endod J. 2004 Jan;37(1):52-60. doi: 10.1111/j.1365-2591.2004.00760.x.
To (i) determine the effect of nonvital bleaching with 10% carbamide peroxide on the sealing ability of resin composite restorations bonded with a self-etching adhesive system; and (ii) compare the effects of antioxidant treatment and delayed restoration after bleaching on marginal seal.
Forty-eight noncarious maxillary incisors were divided into four groups (n=12) after conventional root canal treatment was completed. In group 1, access cavities were restored with a self-etching adhesive system and resin composite. In the remaining three groups, 10% carbamide peroxide bleaching gel was placed into the access cavities for periods of 8 h per day for 1 week. They were then restored in the same manner as group 1. Group 2 consisted of specimens restored immediately after bleaching. Group 3 specimens were treated with the antioxidant, 10% sodium ascorbate, whereas group 4 specimens were immersed in artificial saliva for 1 week before restoration. Ten specimens in each group were then subjected to dye leakage; the remaining 2 specimens were examined in a SEM (Jeol/JSM 5200, Tokyo, Japan). The dye penetration was assessed with the standard scoring system. Statistical analysis was carried out using the Kruskal-Wallis and the Mann-Whitney tests.
Groups 1, 3 and 4 exhibited similar leakage patterns and significantly less leakage than group 2 (P<0.0083). SEM examination of groups 1, 3 and 4 specimens demonstrated close adaptation of resin composite to cavity walls, whereas group 2 specimens did not.
Nonvital bleaching with 10% carbamide peroxide adversely affected the immediate sealing ability of resin composite restoration; both 10% sodium ascorbate treatment and a 1-week delay in restoration following bleaching improved the reduced sealing ability of resin composite.
(i) 确定用10%过氧化脲进行非活髓牙漂白对自酸蚀粘结系统粘结的树脂复合材料修复体封闭能力的影响；(ii) 比较抗氧化处理和漂白后延迟修复对边缘封闭的影响。
48颗非龋性上颌切牙在完成常规根管治疗后分为四组（n = 12）。第1组，用自酸蚀粘结系统和树脂复合材料修复髓腔。在其余三组中，将10%过氧化脲漂白凝胶置于髓腔内，每天放置8小时，持续1周。然后以与第1组相同的方式进行修复。第2组由漂白后立即修复的标本组成。第3组标本用抗氧化剂10%抗坏血酸钠处理，而第4组标本在修复前在人工唾液中浸泡1周。然后每组取10个标本进行染料渗漏检测；其余2个标本在扫描电子显微镜（日本东京Jeol/JSM 5200）下检查。用标准评分系统评估染料渗透情况。采用Kruskal-Wallis检验和Mann-Whitney检验进行统计分析。
第1、3和4组表现出相似的渗漏模式，且渗漏明显少于第2组（P < 0.0083）。对第1、3和4组标本的扫描电子显微镜检查显示树脂复合材料与洞壁紧密贴合，而第2组标本则不然。
用10%过氧化脲进行非活髓牙漂白对树脂复合材料修复体的即时封闭能力有不利影响；10%抗坏血酸钠处理和漂白后延迟1周修复均可改善树脂复合材料降低的封闭能力。
