Parthasarathy Revathy, Kumarappan Senthilkumar, Vishwanath Sankar, Thanikachalam Yashini, Srinivasan Srividhya, Ramachandran Shwetha
Conservative Dentistry and Endodontics, Sree Balaji Dental College and Hospital, Chennai, IND.
Conservative Dentistry and Endodontics, Private Practitioner, Chennai, IND.
Cureus. 2023 Jul 4;15(7):e41361. doi: 10.7759/cureus.41361. eCollection 2023 Jul.
Objective To compare and evaluate the efficacy of tooth bleaching with prior application of two different desensitizing agents such as sodium fluoride and 5% potassium nitrate. Materials and methods A total of 108 extracted human maxillary central incisors were stained in black coffee solution and stored in artificial saliva for colour stabilization. The specimens were randomly divided into three groups (n = 36) according to the following protocols: (a) bleaching without desensitizer, (b) bleaching with prior application of sodium fluoride, and (c) bleaching with prior application of 5% potassium nitrate. After fabricating customized trays, desensitizers were applied for 10 minutes followed by 16% carbamide peroxide bleaching gel, which was in contact with the teeth for three hours. The bleaching efficacy was evaluated at baseline (after staining), 3rd day, 7th day, and 14th day using a digital spectrophotometer. Results There was an increase in the overall colour change (∆E) from baseline to 14th day, which was statistically significant at cervical, middle, and incisal thirds of the teeth between the three groups with the sodium fluoride group showing decreased ∆E. Conclusions Carbamide peroxide (16%) showed improved whitening efficacy from baseline to the 14th day with increasing median values at all time periods. The sodium fluoride group showed decreased ∆E value when compared to other groups.
目的 比较和评估预先应用两种不同脱敏剂（如氟化钠和5%硝酸钾）进行牙齿漂白的效果。材料与方法 总共108颗拔除的人上颌中切牙在黑咖啡溶液中染色，并储存在人工唾液中以稳定颜色。根据以下方案将标本随机分为三组（n = 36）：（a）不使用脱敏剂进行漂白，（b）预先应用氟化钠进行漂白，（c）预先应用5%硝酸钾进行漂白。制作定制托盘后，应用脱敏剂10分钟，然后应用16%过氧化脲漂白凝胶，使其与牙齿接触3小时。使用数字分光光度计在基线（染色后）、第3天、第7天和第14天评估漂白效果。结果 从基线到第14天，总体颜色变化（∆E）有所增加，在牙齿的颈部、中部和切端三分之一处，三组之间差异具有统计学意义，氟化钠组的∆E降低。结论 从基线到第14天，16%过氧化脲显示出改善的美白效果，在所有时间段中位数均增加。与其他组相比，氟化钠组的∆E值降低。
