Ahrari Farzaneh, Hasanzadeh Nadia, Rajabi Omid, Forouzannejad Zakiyeh
DDS, MS, Dental Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
MD, Department of Drug Control, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.
J Clin Exp Dent. 2017 Mar 1;9(3):e344-e350. doi: 10.4317/jced.53108. eCollection 2017 Mar.
This study investigated the effects of sodium bicarbonate (NaHCO3) combined with 1.5% hydrogen peroxide (H2O2) and casein phosphopeptide amorphous calcium phosphate fluoride (CPP-ACPF) on color and microhardness of enamel.
Seventy-five bovine incisors were immersed in a tea solution for 7.5 days. The specimens were randomly divided into five groups according to the whitening agent applied: 1) 94% NaHCO3, 2) a blend of 94% NaHCO3 and CPP-ACPF, 3) a blend of 94% NaHCO3 and 1.5% H2O2, 4) a blend of 94% NaHCO3, 1.5% H2O2 and CPP-ACPF, 5) control. The whitening procedure was performed for 10 times over 10 days. At each day, the buccal surfaces were covered with whitening agents for 5 minutes and then brushed for 30 seconds. After the 10 days, the teeth were again immersed in a tea solution for 10 minutes. Color assessment was performed at baseline (T1), after the first staining process (T2), after the whitening procedure (T3), and after the second staining process (T4). Finally, the specimens were subjected to microhardness test.
There was a statistically significant difference in the color change between T2 and T3 stages among the study groups (<0.05), with the greatest improvement observed in group 4. Microhardness was significantly greater in groups 2 and 4, as compared to the other groups (<0.05).
The combination of 94% NaHCO3, 1.5% H2O2 and CPP-ACPF was effective in improving color and microhardness of teeth with extrinsic stains and could be recommended in the clinical situation.
本研究调查了碳酸氢钠（NaHCO₃）联合1.5%过氧化氢（H₂O₂）以及酪蛋白磷酸肽无定形磷酸钙氟化物（CPP - ACPF）对牙釉质颜色和显微硬度的影响。
75颗牛切牙浸泡于茶溶液中7.5天。根据所应用的美白剂将标本随机分为五组：1）94% NaHCO₃；2）94% NaHCO₃与CPP - ACPF的混合物；3）94% NaHCO₃与1.5% H₂O₂的混合物；4）94% NaHCO₃、1.5% H₂O₂与CPP - ACPF的混合物；5）对照组。美白程序在10天内进行10次。每天，在颊面涂抹美白剂5分钟，然后刷牙30秒。10天后，牙齿再次浸泡于茶溶液中10分钟。在基线（T1）、第一次染色过程后（T2）、美白程序后（T3）以及第二次染色过程后（T4）进行颜色评估。最后，对标本进行显微硬度测试。
研究组中T2和T3阶段之间的颜色变化存在统计学显著差异（<0.05），第4组改善最为明显。与其他组相比，第2组和第4组的显微硬度显著更高（<0.05）。
94% NaHCO₃、1.5% H₂O₂与CPP - ACPF的组合对于改善外源性染色牙齿的颜色和显微硬度有效，可在临床情况中推荐使用。
