Khoroushi Maryam, Shirban Farinaz, Kaveh Sara, Doustfateme Samaneh
Dental Materials Research Center, Department of Operative Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Dental Research Center and Department of Orthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Restor Dent Endod. 2016 Aug;41(3):196-201. doi: 10.5395/rde.2016.41.3.196. Epub 2016 Jul 14.
The aim of this in vitro study was to evaluate the effect of incorporating three different nanobiomaterials into bleaching material on microhardness of bleached enamel.
The crowns of 24 extracted sound human molars were sectioned. Sixty enamel specimens (2 × 3 × 4 mm) were selected and divided into five groups (n = 12): Group 1 received no bleaching procedure (control); Group 2 underwent bleaching with a 40% hydrogen peroxide (HP) gel; Groups 3, 4, and 5 were bleached with a 40% HP gel modified by incorporation of bioactive glass (BAG), amorphous calcium phosphate (ACP) and hydroxyapatite (HA), respectively. The enamel microhardness was evaluated. The differences in Knoop microhardness data of each group were analyzed by one-way ANOVA, followed by post hoc Tukey tests.
Significant differences were observed between the study groups. The enamel microhardness changes in Groups 1, 3, 4, and 5 were significantly lower than that of Group 2 (p < 0.001).
Within the limitations of this study, it can be concluded that incorporation of each one of the three tested biomaterials as remineralizing agents might be effective in decreasing enamel microhardness changes subsequent to in-office bleaching.
本体外研究的目的是评估将三种不同的纳米生物材料加入漂白材料中对漂白釉质显微硬度的影响。
将24颗拔除的健康人磨牙的牙冠进行切片。选取60个釉质标本（2×3×4毫米）并分为五组（n = 12）：第1组不进行漂白程序（对照组）；第2组用40%过氧化氢（HP）凝胶进行漂白；第3组、第4组和第5组分别用掺入生物活性玻璃（BAG）、无定形磷酸钙（ACP）和羟基磷灰石（HA）的40%HP凝胶进行漂白。评估釉质显微硬度。通过单因素方差分析分析每组努氏显微硬度数据的差异，随后进行事后Tukey检验。
各研究组之间观察到显著差异。第1组、第3组、第4组和第5组的釉质显微硬度变化显著低于第2组（p < 0.001）。
在本研究的局限性内，可以得出结论，将三种测试生物材料中的每一种作为再矿化剂加入可能有效地减少诊室漂白后釉质显微硬度的变化。
