Al-Sugair M H, Akpata E S
National Guard Hospital, Riyadh, Saudi Arabia.
J Oral Rehabil. 1999 Jun;26(6):521-8. doi: 10.1046/j.1365-2842.1999.00391.x.
To investigate the effect of fluorosis on the pattern and depth of etch of human enamel, 420 enamel specimens classified according to the Thylstrup and Fejerskov index (TFI) were etched with 37% phosphoric acid for varying times. The mean depths of etch for mildly fluorosed enamel (TFI = 1-3) were generally dependent on etching time (r = 0.55-0.76), and were not significantly different from the depth obtained for non-fluorosed (TFI = 0) specimens. The enamel specimens with more severe fluorosis (TF = 4) required longer etching time which showed little correlation with the mean depth of etch (r = 0.15-0.16). Furthermore, the etched specimens showed typical enamel etching patterns, independent of the severity of fluorosis. When the specimens with TFI = 4 were etched for 45 s, the subsurface organic network was evident, but this disappeared and typical etching patterns could be seen again when etching time was increased to 75-90 s. It is therefore concluded that the diagnosis of the severity of fluorosis must first be made whenever etching of fluorosed enamel is contemplated.
为研究氟斑牙对人牙釉质酸蚀形态和深度的影响，将420个根据蒂尔斯楚普和费耶尔斯科夫指数（TFI）分类的牙釉质标本用37%的磷酸酸蚀不同时间。轻度氟斑牙釉质（TFI = 1 - 3）的平均酸蚀深度通常取决于酸蚀时间（r = 0.55 - 0.76），且与无氟斑牙（TFI = 0）标本的酸蚀深度无显著差异。氟斑牙更严重（TF = 4）的牙釉质标本需要更长的酸蚀时间，且与平均酸蚀深度相关性很小（r = 0.15 - 0.16）。此外，酸蚀后的标本呈现出典型的牙釉质酸蚀形态，与氟斑牙的严重程度无关。当TFI = 4的标本酸蚀45秒时，表面下有机网络明显，但当酸蚀时间增加到75 - 90秒时，这种现象消失，又能看到典型的酸蚀形态。因此得出结论，每当考虑对氟斑牙釉质进行酸蚀时，必须首先对氟斑牙的严重程度进行诊断。
