Reis Patrícia Queiroz, da Silva Eduardo Moreira, Calazans Fernanda Signorelli, Lopes Letícia Souza, Poubel Luiz Augusto, Alves Wesley Veltri, Barceleiro Marcos Oliveira
Gen Dent. 2018 Jul-Aug;66(4):66-70.
The dental profession is still pursuing the most effective way to treat white-spot lesions in order to produce a sound and esthetically pleasing enamel surface. The aim of the present research was to evaluate in vitro the effects of a dentifrice with nanohydroxyapatite (nano-HAp) on the roughness, color, lightness, and brightness (gloss) of bovine enamel subjected to pH cycling. Twelve enamel discs prepared from bovine incisors were divided into 2 experimental groups: dentifrice with sodium fluoride (Colgate Total 12 Clean Mint) and dentifrice with nanoHAp (Megasonex). For 14 days, the specimens were subjected to 30 cycles of simulated brushing twice a day as well as to a pH cycling model (6 hours of demineralization and 18 hours of remineralization daily). The roughness, color, lightness, and brightness of all specimens were evaluated at baseline (immediately after specimen preparation) and after 7 and 14 days of treatment. A Tukey test demonstrated that there were no statistically significant differences in the effects of the dentifrices on any parameter after 7 days (P > 0.05). After 14 days, however, there was a statistically significant increase in mean roughness in the group brushed with fluoride dentifrice (P < 0.05). Thus, the nanoHAp containing dentifrice promoted less superficial roughness after 14 days, but both dentifrices were similar in relation to color variation, lightness, and brightness.
牙科行业仍在探寻治疗白斑病变的最有效方法，以期打造出健康且美观的牙釉质表面。本研究旨在体外评估含纳米羟基磷灰石（nano-HAp）的牙膏对经pH循环处理的牛牙釉质的粗糙度、颜色、明度和亮度（光泽度）的影响。将从牛切牙制备的12个牙釉质圆盘分为2个实验组：含氟化钠的牙膏（高露洁全效清新薄荷牙膏）和含纳米HAp的牙膏（Megasonex）。持续14天，每天对标本进行两次模拟刷牙，共30个循环，同时采用pH循环模型（每天6小时脱矿和18小时再矿化）。在基线期（标本制备后立即）以及治疗7天和14天后，对所有标本的粗糙度、颜色、明度和亮度进行评估。Tukey检验表明，7天后两种牙膏对任何参数的影响均无统计学显著差异（P>0.05）。然而，14天后，使用含氟牙膏刷牙的组平均粗糙度有统计学显著增加（P<0.05）。因此，含纳米HAp的牙膏在14天后产生的表面粗糙度较小，但两种牙膏在颜色变化、明度和亮度方面相似。
