Bahadure R N, Pandey R K, Kumar R, Gopal K, Singh R K
Department of Pedodontics & Preventive Dentistry, Sharad Pawar Dental College, Sawangi (Meghe), Wardha, Maharashtra, India.
J Indian Soc Pedod Prev Dent. 2012 Apr-Jun;30(2):122-6. doi: 10.4103/0970-4388.99983.
In the mid of 1980s, the cariostatic effect of fluoride ions on enamel caries had been demonstrated in many studies. The use of fluoride releasing dental restorative materials has seen increasing from many years for the specific purpose of leaching of fluoride into the surrounding tissues to inhibit secondary dental caries as well as prevention of caries in the newly erupted tooth. In the dental caries, acidic environment causes the demineralization of tooth structure and also affect the restorative margins of dental restoration.
various restorative materials show different behavior in different pH conditions of oral cavity. Thus, the aim of this study was to evaluate the fluoride release of the various restorative materials at different pH.
In this in vitro study, 30 samples of each dental restorative material were prepared and grouped into five with six samples in each group as per the pH of the solution 4.3, 4.6, 5.0, 5.5, and 6.2. All the samples were subjected to alternate cycling of the demineralizing solution (6 h) and remineralizing solution (18 h) for 15 days.
the fluoride release was measured by using fluoride ion specific electrode and digital ion analyzer. The result showed that the fluoride release rate was significantly higher in first day and reduced after third day to nearly constant level. At pH 4.3, the fluoride release was highest and lowest at pH 6.2.
the Amalgomer CR showed the highest fluoride release among all the experimental dental restorative materials.
在20世纪80年代中期，许多研究已证明氟离子对牙釉质龋的防龋作用。多年来，为了使氟渗入周围组织以抑制继发龋以及预防新萌出牙的龋病，含氟牙科修复材料的使用日益增加。在龋齿中，酸性环境会导致牙齿结构脱矿，还会影响牙科修复体的修复边缘。
各种修复材料在口腔不同的pH条件下表现出不同的特性。因此，本研究的目的是评估各种修复材料在不同pH值下的氟释放情况。
在这项体外研究中，制备了每种牙科修复材料的30个样本，并根据溶液的pH值4.3、4.6、5.0、5.5和6.2分为五组，每组六个样本。所有样本在脱矿溶液（6小时）和再矿化溶液（18小时）中交替循环15天。
使用氟离子特异性电极和数字离子分析仪测量氟释放量。结果表明，氟释放率在第一天显著较高，第三天后降低至接近恒定水平。在pH 4.3时，氟释放量最高，在pH 6.2时最低。
在所有实验性牙科修复材料中，汞合金CR显示出最高的氟释放量。
