Meng C L, Wang W N, Yeh I S
National Defense Medical Center, Taipei, Taiwan, Republic of China.
Am J Orthod Dentofacial Orthop. 1997 Sep;112(3):259-62. doi: 10.1016/S0889-5406(97)70253-1.
Enamel demineralization that occurs adjacent to directly bonded orthodontic attachments is of great concern to orthodontists. One procedure suggested to overcome this problem is to use fluoride treatment in an acid etch. The purpose of this study was to evaluate the bond strength and the debonding interface distribution of adhesive, with and without the use of fluoridated etch on enamel, before bonding. Ten teeth were etched with 37% phosphoric acid (H3PO4), incorporated with 1.23% sodium fluoride (NaF) for 15 seconds. The control group of 10 teeth was etched with the 37% H3PO4 solution for 15 seconds without fluoride. Fluoride on enamel was first detected with scanning auger microscribe/photoelectron spectroscopy in the fluoridated etching group. The brackets were then bonded on the labial surfaces of the crowns of both groups of teeth. The bracketed teeth were tested, with an Instron machine, to determine the tensile bond strength, as well as with a scanning electron microscope, and by mapping with an energy dispersive x-ray spectrometer to detect the debonding interfaces. The results showed that the fluoride was found on the enamel after fluoridated etching for 15 seconds. The bond strength and debonding interface distribution between the two groups were not statistically significantly different. Enamel detachment was not present in either group. Hence, the fluoridated etching with 1.23% NaF may have a clinical application in the prevention of demineralization or caries surrounding and under orthodontic brackets bonded to enamel.
正畸托槽直接粘结部位附近出现的牙釉质脱矿是正畸医生极为关注的问题。一种被建议用来克服这一问题的方法是在酸蚀过程中使用氟化物处理。本研究的目的是评估在粘结前，牙釉质使用含氟酸蚀剂和不使用含氟酸蚀剂时，粘结剂的粘结强度和脱粘界面分布情况。10颗牙齿用含有1.23%氟化钠（NaF）的37%磷酸（H3PO4）酸蚀15秒。对照组的10颗牙齿用不含氟化物的37% H3PO4溶液酸蚀15秒。在含氟酸蚀组中，首先用扫描俄歇微探针/光电子能谱检测牙釉质上的氟化物。然后将托槽粘结在两组牙齿牙冠的唇面。使用英斯特朗材料试验机对带托槽的牙齿进行测试，以确定拉伸粘结强度，同时使用扫描电子显微镜，并通过能谱仪进行图谱分析以检测脱粘界面。结果显示，含氟酸蚀15秒后牙釉质上发现有氟化物。两组之间的粘结强度和脱粘界面分布没有统计学上的显著差异。两组均未出现牙釉质脱落。因此，含1.23% NaF的含氟酸蚀可能在预防正畸托槽粘结于牙釉质周围及下方的脱矿或龋齿方面具有临床应用价值。
