Kamat Sharad, Malgundkar Nakul Hemantkumar, Gupta Divya, Kamat Mamata
Department of Conservative Dentistry and Endodontics, Bharati Vidyapeeth (Deemed to be University) Dental College and Hospital, Sangli, India.
White Teeth Advanced Dental Clinic, Mumbai, India.
J Conserv Dent Endod. 2024 Mar;27(3):321-325. doi: 10.4103/JCDE.JCDE_41_24. Epub 2024 Mar 6.
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.
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.
Data were analyzed using the analysis of variance and Tukey's -test with significance level of < 0.05.
Highest load was exhibited by Group I. Group V showed satisfactory shear strength followed by Groups IV, III, II, and VI.
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.
前牙变色可通过漂白进行保守且无创的治疗，以达到理想的美学效果。然而，对于某些临床病例，为获得最佳效果，漂白联合复合树脂是可取的。然而，复合树脂与漂白牙的剪切粘结强度（SBS）会显著降低。在进行复合树脂修复之前，需要用抗氧化剂处理漂白后的牙釉质以提高其SBS。本研究旨在评估和比较不同时间间隔下草药抗氧化剂对复合树脂与漂白牙釉质SBS的影响。
60颗拔除后的单根上颌切牙，唇面朝上，固定于冷固化丙烯酸树脂中。样本随机分为：第一组 - 未漂白组；第二组 - 漂白后用10%松树皮提取物处理10分钟；第三组 - 漂白后用10%松树皮提取物处理20分钟；第四组 - 漂白后用10%迷迭香提取物处理10分钟；第五组 - 漂白后用10%迷迭香提取物处理20分钟；第六组 - 未使用抗氧化剂。除用作阴性对照的样本外，所有样本均用35%过氧化氢漂白。随后在制备好的牙釉质上制作直径和长度均为4mm的复合树脂圆柱体。使用万能试验机记录破坏时的最大载荷。
采用方差分析和Tukey检验进行数据分析，显著性水平为<0.05。
第一组显示出最高载荷。第五组显示出令人满意的剪切强度，其次是第四组、第三组、第二组和第六组。
与处理10分钟相比，10%迷迭香提取物和10%松树皮提取物处理20分钟时效果更好。抗氧化剂处理时间的延长会增加SBS。
