正畸粘接用树脂改良型玻璃离子粘固剂的氟离子释放

Fluoride release characteristics of resin-modified glass ionomercement for orthodontic bonding

目的 :明确正畸粘接用树脂改良型玻璃离子粘固剂 (resin modifiedglassionomers)释放氟离子情况并检测其吸收外界氟离子和再释氟性能。方法 :实验分 3组 ,分别用Advance和GCFujiOrtho树脂改良型玻璃离子粘固剂以及DM复合树脂粘接剂 (compositeresin)作为研究对象。每组中包括 5个由同一材料制作的标准圆柱体型样本。实验第 1～ 12天将样本放置在去离子水中。第 13～ 15天 ,每天用含氟牙膏处理 10min后放置于去离子水中。利用氟离子选择性电极检测不同材料每天释放出的氟离子浓度。结果 :玻璃离子粘固剂在整个实验期间都能释放一定量的氟离子。第 1天的氟释放量最大 ,以后明显减少 ,在第 13天 (含氟牙膏处理的第 1天 )玻璃离子粘固剂的氟释放量出现回升 ,约是处理前 (第 12天 )释放量的 1.6倍。GCFujiOrtho粘固剂的氟释放量高于Advance粘固剂 ,差异有显著性 (P <0 .0 1)。复合树脂粘接剂基本没有氟离子释放 ,即使经过含氟牙膏处理后 ,也没有明显的氟离子再释放现象。结论 :体外研究中 ,树脂改良型玻璃离子粘固剂具有释放氟离子、吸收外界较高浓度氟离子并再释放的特点。提示其可能会起到抑制托槽周围釉质脱矿和促进釉质再矿化的作用。

Objective: To firstly investigate the fluoride releasing characteristics of resin modified glass ionomercement for orthodontic bonding,and secondly to assess the fluoride uptake and subsequent release from the same material.Methods: There were three groups in this study. Two resin modified glass ionomercement (Advance and GC Fuji Ortho) and composite resin (DM) were used in each group respectively.Five standard cylinder samples were made for each material. From the first day to 12 th day, samples were immersed in de ionised water. Samples were firstly exposed to a fluoride toothpaste slurry for 10 min, then immersed in de ionised water during the 13 th ～15 th day. A fluoride ion selective electrode was used to assess the fluoride concentrations of each material in every day. Results: Both glass ionomer cements released measurable amounts of fluoride throughout the test period. The highest amount of fluoride released was on the first day, then it fell sharply, but the amount increased by 1.6 times on 13 th day (the 1 st day of samples exposed to fluoride toothpaste) The amount of fluoride released of GC Fuji Ortho was more than that of Advance, there were statistically significant differences between two materials ( P <0.01, t test ). There was no measurable fluoride release from composite resin, even after it was exposed to fluoride toothpaste. Conclusion: The resin modified glass ionomercement have the fluoride releasing and fluoride uptake and subsequent release characteristics in vitro . It is suggested that this material might have the effects on prevention of enamel decalcification and increasing enamel recalcification.