Rao A, Rao A, Sudha P
Department of Pedodontics, Manipal College of Dental Sciences, Mangalore, Manipal University, India.
J Indian Soc Pedod Prev Dent. 2011 Jul-Sep;29(3):202-4. doi: 10.4103/0970-4388.85812.
In addition to their fluoride-releasing properties, glass ionomer cement (GICs) have the ability to reuptake and release fluorides from commonly used sources like fluoridated dentifrices. This property has the potential to provide a continuous low concentration of fluoride in the saliva aiding in caries prevention. The superior fluoride-recharging abilities of resin-modified GICs over conventional GICs have been documented. The manufacturer of a non-resin, auto-cured GIC (GC Fuji VII) claims fluoride release from the product to be about six times that of conventional GIC. It was hypothesized that perhaps this high fluoride release could translate into a high reuptake and release, when exposed to a 1 000 ppm fluoridated dentifrice every day, thus providing increased fluoride levels in saliva.
This study therefore examined fluoride-recharging abilities of the non-resin, auto-cured glass ionomer cement from a 1 000 ppm fluoridated dentifrice and compared it with resin-modified glass ionomer cement.
Twelve glass ionomer discs each of resin-modified glass ionomer cement (GC Fuji II L C, Group 1) and the non-resin, auto-cured glass ionomer cement (GC Fuji VII, Group 2) were prepared with precise dimensions of 9 x 2 mm. The 12 specimens in each group were further subdivided into two subgroups of six each. Subgroup A involved no fluoride treatment (Control). Subgroup B involved application of a 1 000 ppm dentifrice for 2 minutes twice daily with a soft toothbrush. The disc-specimens were then suspended in airtight plastic bottles containing exactly 20 ml double distilled water. The fluoride concentration of the water in which the specimen discs were immersed was measured by means of a fluoride ion selective electrode connected to an ion selective electrode meter/digital ion analyzer at 1, 2, 7, 15, and 30 days.
It was performed using the Kruskal-Wallis Test.
Fuji VII, despite a high fluoride release, did not significantly recharge when exposed to a 1 000 ppm fluoridated dentifrice.
除了具有释氟特性外，玻璃离子水门汀（GICs）还能够从常用来源（如含氟牙膏）中再摄取并释放氟化物。这一特性有可能在唾液中提供持续低浓度的氟化物，有助于预防龋齿。树脂改性玻璃离子水门汀相较于传统玻璃离子水门汀具有更优异的氟再充注能力，这一点已有文献记载。一种非树脂自凝玻璃离子水门汀（GC Fuji VII）的制造商宣称该产品的氟释放量约为传统玻璃离子水门汀的六倍。据推测，或许这种高氟释放量在每天接触1000 ppm含氟牙膏时，能够转化为高再摄取和释放量，从而使唾液中的氟含量增加。
因此，本研究检测了这种非树脂自凝玻璃离子水门汀从1000 ppm含氟牙膏中的氟再充注能力，并将其与树脂改性玻璃离子水门汀进行比较。
制备了12个树脂改性玻璃离子水门汀（GC Fuji II L C，第1组）和12个非树脂自凝玻璃离子水门汀（GC Fuji VII，第2组）的玻璃离子圆盘，精确尺寸为9×2 mm。每组的12个样本进一步细分为两个亚组，每组6个。亚组A不进行氟处理（对照组）。亚组B每天用软毛牙刷两次涂抹1000 ppm牙膏2分钟。然后将圆盘样本悬浮于装有20 ml双蒸水的密封塑料瓶中。在第1、2、7、15和30天，通过连接离子选择电极计/数字离子分析仪的氟离子选择电极测量浸泡样本圆盘的水中的氟浓度。
采用Kruskal-Wallis检验进行分析。
尽管Fuji VII氟释放量高，但在接触1000 ppm含氟牙膏时，其再充注量并不显著。
