Hallgren A, Oliveby A, Twetman S
Department of Orthodontics, Medical and Dental Health Center, Halmstad, Sweden.
Caries Res. 1993;27(1):51-4. doi: 10.1159/000261515.
The fluoride concentrations in dental plaque adjacent to orthodontic brackets retained with a glass ionomer cement (GIC) or a resin-based composite were investigated using the split-mouth technique. 48-hour plaque was collected at 3, 8, 28 days and 6 months after the onset of orthodontic treatment. The fluoride content of the plaque samples was determined after a microdiffusion procedure with a fluoride-sensitive electrode. Significantly (p < 0.001-0.05) elevated concentrations of fluoride were found in the plaque samples collected adjacent to GIC-retained brackets compared to plaque sampled from composite-retained brackets on all sampling occasions. The results suggest that GIC-bonded brackets in orthodontic treatment may act as local long-term fluoride-releasing devices.
采用自身对照技术，研究了用玻璃离子水门汀（GIC）或树脂基复合材料固定的正畸托槽附近牙菌斑中的氟化物浓度。在正畸治疗开始后的3天、8天、28天和6个月收集48小时的牙菌斑。用氟离子敏感电极通过微扩散程序测定菌斑样本中的氟含量。在所有采样时间点，与复合材料固定托槽处采集的菌斑相比，GIC固定托槽附近采集的菌斑样本中氟化物浓度显著升高（p<0.001-0.05）。结果表明，正畸治疗中GIC粘结托槽可能作为局部长期氟释放装置。
