Silva-Fialho Paulo, Ferreira Robson, Leal José, Tabchoury Cínthia, Vale Gláuber
Restorative Dentistry Department, Federal University of Piauí, Teresina, Brazil.
Physiological Sciences Department, Piracicaba Dental School, Piracicaba, Brazil.
J Clin Exp Dent. 2021 May 1;13(5):e493-e498. doi: 10.4317/jced.57673. eCollection 2021 May.
There is a lack of information about the association of high-fluoride dentrifrice and fluoride-containing bonding material to prevent enamel white spot lesions development adjacent to brackets. The aim of this in vitro study was to evaluate the effect of high-fluoride dentifrice and fluoride-containing bonding material on enamel demineralization adjacent to orthodontic brackets.
Forty-eight enamel specimens with 7x7x2 mm were obtained from bovine incisors. Orthodontic brackets were bonded with fluoride-containing resin composite (OrthoCem®) or fluoride-free low viscosity resin. The specimens were submitted to an 8-day pH cycling that consisted in the daily immersion of specimens in the demineralizing solution for 4 h and in artificial saliva for 20 h in an incubator at 37° C. The treatments consisted in 5 min-immersion between the cycles of fluoride (F) suspensions containing 275 µg F/mL, 1,250 µg F/mL or distilled water (negative control). The 275 and 1,250 µg F/mL concentrations were used to simulate salivary dilution of 1,100 and 5,000 µg F/g dentifrices during toothbrushing. After the experiment, cross-sectional hardness was performed to analyze the lesion area of the specimens. Tukey post hoc test after two-way ANOVA with p at 5% was used as statistical analysis.
The specimens treated with high-fluoride dentifrice showed significantly less demineralization in comparison with the other treatments (>0.05). There was a significant difference in the cross-sectional hardness values for the specimens bonded with OrthoCem when compared to the low viscosity resin (>0,05).
The use of high-fluoride dentifrice associated with fluoride-containing bonding material promoted a greater reduction of enamel demineralization adjacent to orthodontic brackets. Demineralization, dentifrice, fluoride, bonding materials, orthodontic brackets.
关于高氟牙膏和含氟粘结材料与预防托槽附近牙釉质白斑病变发展之间关联的信息匮乏。本体外研究的目的是评估高氟牙膏和含氟粘结材料对正畸托槽附近牙釉质脱矿的影响。
从牛切牙获取48个尺寸为7×7×2毫米的牙釉质标本。正畸托槽用含氟树脂复合材料（OrthoCem®）或无氟低粘度树脂粘结。标本进行为期8天的pH循环，即每天将标本在脱矿溶液中浸泡4小时，然后在37℃的培养箱中在人工唾液中浸泡20小时。处理方法是在含275μg F/mL、1250μg F/mL氟（F）悬浮液或蒸馏水（阴性对照）的循环之间浸泡5分钟。使用275和1250μg F/mL的浓度来模拟刷牙期间牙膏中1100和5000μg F/g唾液稀释情况。实验结束后，进行横截面硬度测试以分析标本的病变区域。采用双向方差分析后进行Tukey事后检验，p值设为5%作为统计分析。
与其他处理相比，用高氟牙膏处理的标本脱矿明显更少（>0.05）。与低粘度树脂粘结的标本相比，用OrthoCem粘结的标本横截面硬度值有显著差异（>0.05）。
使用高氟牙膏与含氟粘结材料相结合，可更大程度地减少正畸托槽附近牙釉质的脱矿。脱矿、牙膏、氟、粘结材料、正畸托槽。
