Nathan Karayil Binu, Nadig Roopa R, Job Tisson Varghese, Nithin Puthan Veetil, Karthik Rajesh, Choudary Sailaja
Department of Conservative Dentistry and Endodontics, Educare Institute of Dental Sciences, Malappuram, Kerala, India, Phone: +91 9895980043, e-mail:
Department of Conservative Dentistry and Endodontics, Dayananda Sagar College of Dental Sciences, Bengaluru, Karnataka, India.
J Contemp Dent Pract. 2019 May 1;20(5):587-592.
The aim of this study is to evaluate and compare the amount of radicular peroxide penetration when various concentrations of carbamide peroxide (CP) bleaching gels (10, 15, and 35%) and a mixture of 30% hydrogen peroxide (HP) with sodium perborate are used for intracoronal bleaching.
Fifty extracted single-rooted premolars from young adults were used. The specimens were then divided into five groups such that teeth with varying sizes were equally distributed in all groups. Group I-distilled water (control group), group II-10% CP, group III-15% CP, group IV-35% CP, and group V-30% HP with sodium perborate. Intermediate restorative material (IRM) was used to seal access cavities and left for a week at 37 °C in an incubator. Following the bleaching process, suspended teeth from plastic tubes containing distilled water were removed and the water was used to determine the amount of peroxide levels. A UV-visible spectrophotometer at a wavelength of 480 nm was used to determine the quantity of peroxide based on the optical density.
Results showed the highest peroxide leakage in group V, followed by group IV, and then group III, whereas the least peroxide penetration was found in group II, and the control group or group I showed no penetration. The Kruskal-Wallis test showed a significant difference between the various groups tested. The Mann-Whitney test was done to find in which pair of groups there exists a significant difference. It was found that all the groups when compared among themselves showed a significant difference.
The present study concluded that lower concentrations of CP 10 and 15% produced lower peroxide leakage. Hence, it could be tried as an alternate to traditional agents in cases with compromised tooth which shows cervical tooth defects where the risk of external root resorption is higher.
The management of discolored teeth involves different techniques; among various techniques, bleaching is considered to be a safe, effective, and relatively noninvasive technique to lighten discolored teeth and it also conserves dental hard tissue.
本研究旨在评估和比较当使用不同浓度的过氧化脲（CP）漂白凝胶（10%、15%和35%）以及30%过氧化氢（HP）与过硼酸钠的混合物进行冠内漂白时，根管内过氧化物的渗透量。
使用了50颗从年轻成年人中拔除的单根前磨牙。然后将标本分为五组，使不同大小的牙齿均匀分布在所有组中。第一组 - 蒸馏水（对照组），第二组 - 10% CP，第三组 - 15% CP，第四组 - 35% CP，第五组 - 30% HP与过硼酸钠。使用中间修复材料（IRM）密封进入腔，并在37°C的培养箱中放置一周。漂白过程完成后，从装有蒸馏水的塑料管中取出悬吊的牙齿，并用该水测定过氧化物水平。使用波长为480 nm的紫外可见分光光度计根据光密度测定过氧化物的量。
结果显示第五组的过氧化物渗漏最高，其次是第四组，然后是第三组，而第二组的过氧化物渗透最少，对照组即第一组未显示渗透。Kruskal-Wallis检验显示在测试的各组之间存在显著差异。进行Mann-Whitney检验以找出在哪两组之间存在显著差异。结果发现所有组相互比较时均显示出显著差异。
本研究得出结论，较低浓度的10%和15% CP产生的过氧化物渗漏较低。因此，对于出现颈部牙齿缺陷且外源性牙根吸收风险较高的受损牙齿病例，它可以作为传统药物的替代品进行尝试。
变色牙的处理涉及不同技术；在各种技术中，漂白被认为是一种安全、有效且相对无创的技术，可使变色牙变浅，同时还能保留牙齿硬组织。
