Wilson T G, Love B
Department of Orthodontics, Emory University, School of Postgraduate Dentistry, Des Moines, Ia, USA.
Am J Orthod Dentofacial Orthop. 1995 Apr;107(4):379-81. doi: 10.1016/s0889-5406(95)70090-0.
The purpose of this study was to examine the effect of fluoride-releasing elastomers on enamel microhardness levels. Sixteen teeth from four patients scheduled to have premolars extracted as part of their orthodontic treatment were examined in this study. Orthodontic brackets were bonded to the buccal surface of the test teeth with a nonfluoridated adhesive. Two of the patients had fluoride-releasing elastomers placed on the right upper and lower brackets and conventional elastomers placed on the left side. This sequence was reversed for the remaining two patients. After 1 calendar month, the experimental teeth were extracted, sectioned, and embedded in acrylic. Microhardness tests were performed 50 to 75 microns cervical to the bracket. Indentations were taken at the surface and continued in 20 microns increments to a depth of 200 microns. Results showed the enamel was significantly harder (p < 0.05) in the fluoride group at the 20 microns depth compared with the control group. No other microhardness readings showed a statistically significant difference.
本研究的目的是检测含氟弹性体对牙釉质显微硬度水平的影响。本研究检测了4名计划拔除前磨牙作为正畸治疗一部分的患者的16颗牙齿。用不含氟的粘合剂将正畸托槽粘结在受试牙齿的颊面。其中2名患者在右上和右下托槽上放置含氟弹性体，在左侧放置传统弹性体。其余2名患者的顺序相反。1个历月后，拔除实验牙齿，切片并嵌入丙烯酸树脂。在距托槽颈部50至75微米处进行显微硬度测试。在表面进行压痕，并以20微米的增量持续到200微米的深度。结果显示，与对照组相比，含氟组在20微米深度处的牙釉质明显更硬（p<0.05）。其他显微硬度读数均未显示出统计学上的显著差异。
