PDF(Pubmed)
Abstract：
UNASSIGNED: Anterior tooth discolorations can be treated conservatively and noninvasively through bleaching to achieve the desired esthetic outcomes. However, bleaching along with composite resin is advisable for certain clinical cases for optimum results. However, shear bond strength (SBS) of composite resin to the bleached tooth gets significantly lowered. Before placing the composite restoration, the bleached enamel needs to be treated with antioxidant agents to increase its SBS. The study aims to evaluate and compare the effect of herbal antioxidants on SBS of composite resin to bleached enamel at different time intervals.
UNASSIGNED: Sixty extracted single-rooted maxillary incisors postdecoronation, keeping their labial surfaces up were mounted in cold-cure acrylic resin. The samples were randomly divided into: Group I - unbleached; Group II - 10% pine bark extract for 10 min postbleaching; Group III - 10% pine bark extract for 20 min postbleaching; Group IV - application of 10% rosemary extract for 10 min postbleaching, Group V - application of 10% rosemary extract for 20 min postbleaching; Group VI - no application of antioxidant. 35% hydrogen peroxide was used for bleaching all the samples except those which served as negative control. Later composite cylinder 4 mm in diameter and length were built on prepared enamel. The maximum load at failure was recorded using the universal testing machine.
UNASSIGNED: Data were analyzed using the analysis of variance and Tukey\'s t-test with significance level of P < 0.05.
UNASSIGNED: Highest load was exhibited by Group I. Group V showed satisfactory shear strength followed by Groups IV, III, II, and VI.
UNASSIGNED: Both 10% rosemary and 10% pine bark extracts showed better results when applied for 20 min as compared to 10 min application. Increased duration of antioxidant application increases the SBS.
UNASSIGNED: Sixty extracted single-rooted maxillary incisors postdecoronation, keeping their labial surfaces up were mounted in cold-cure acrylic resin. The samples were randomly divided into: Group I - unbleached; Group II - 10% pine bark extract for 10 min postbleaching; Group III - 10% pine bark extract for 20 min postbleaching; Group IV - application of 10% rosemary extract for 10 min postbleaching, Group V - application of 10% rosemary extract for 20 min postbleaching; Group VI - no application of antioxidant. 35% hydrogen peroxide was used for bleaching all the samples except those which served as negative control. Later composite cylinder 4 mm in diameter and length were built on prepared enamel. The maximum load at failure was recorded using the universal testing machine.
UNASSIGNED: Data were analyzed using the analysis of variance and Tukey\'s t-test with significance level of P < 0.05.
UNASSIGNED: Highest load was exhibited by Group I. Group V showed satisfactory shear strength followed by Groups IV, III, II, and VI.
UNASSIGNED: Both 10% rosemary and 10% pine bark extracts showed better results when applied for 20 min as compared to 10 min application. Increased duration of antioxidant application increases the SBS.
摘要：
■前牙变色可以通过漂白进行保守和非侵入性治疗，以达到理想的美学效果。然而,对于某些临床病例，建议与复合树脂一起漂白以获得最佳效果。然而,复合树脂对漂白牙齿的剪切粘合强度（SBS）显着降低。在放置复合修复体之前，漂白的釉质需要用抗氧化剂处理以增加其SBS。该研究旨在评估和比较草药抗氧化剂在不同时间间隔对复合树脂漂白牙釉质SBS的影响。
■60个拔除单根上颌切牙后装饰，保持阴唇表面向上安装在冷固化丙烯酸树脂中。将样品随机分为：I组-未漂白；II组-10％松树皮提取物漂白后10分钟；III组-10％松树皮提取物漂白后20分钟；IV组-应用10％迷迭香提取物漂白后10分钟，组V-应用10%迷迭香提取物20分钟后漂白;组VI-不应用抗氧化剂。35%过氧化氢用于漂白除了用作阴性对照的那些样品之外的所有样品。后来在制备的搪瓷上构建直径和长度为4mm的复合圆柱体。使用万能试验机记录失效时的最大载荷。
■数据分析采用方差分析和Tukeyt检验，显著性水平为P<0.05。
■第一组表现出最高的载荷。第五组表现出令人满意的剪切强度，然后是第四组，III,II,和VI。
当施用20分钟时,与施用10分钟相比,10%迷迭香和10%松树皮提取物均显示出更好的结果。增加抗氧化剂施用的持续时间增加SBS。
■60个拔除单根上颌切牙后装饰，保持阴唇表面向上安装在冷固化丙烯酸树脂中。将样品随机分为：I组-未漂白；II组-10％松树皮提取物漂白后10分钟；III组-10％松树皮提取物漂白后20分钟；IV组-应用10％迷迭香提取物漂白后10分钟，组V-应用10%迷迭香提取物20分钟后漂白;组VI-不应用抗氧化剂。35%过氧化氢用于漂白除了用作阴性对照的那些样品之外的所有样品。后来在制备的搪瓷上构建直径和长度为4mm的复合圆柱体。使用万能试验机记录失效时的最大载荷。
■数据分析采用方差分析和Tukeyt检验，显著性水平为P<0.05。
■第一组表现出最高的载荷。第五组表现出令人满意的剪切强度，然后是第四组，III,II,和VI。
当施用20分钟时,与施用10分钟相比,10%迷迭香和10%松树皮提取物均显示出更好的结果。增加抗氧化剂施用的持续时间增加SBS。
