Fluoride Etching Solution On The Enamel Surface Morphology Changes In Scanning Electron Microscopy

ObjectiveEnamel demoralization that occurs adjacent to directly bonded orthodontic attachments is of great concern to orthodontists. Research has demonstrated that plaque more readily accumulates on the enamel around the brackets. Meanwhile, in order to enhance the bonud strength of the brackets, etching technique has been applied. Both of the factors makes the enamel may be more susceptible to caries and decalciflcation. Recently, studies has been concerned on increasing the resistance of the tooth surface to demineralization. It has been known the fluoraide has a remarkable ability to reduce the incidence of dental caries. Fluoride can increase the resistance of enamel to acid , increase the maturation rate of enamel, and interferes with the ma-tabolism of microorganisms. The purpose of this study is to evalue the changes on enamel morphology by scanning electron microscopy when they were conditioned with 35% phosphoric acid gel containing 0% ,1. 23% ,2% ,3% sodium fluoride.Methods20 extracted human premolars were divided into five groups of 4 teeth each (A,B,C,D,E). The enamel of each group was conditioned with 35% phosphoric acid that containing 0% ,1.23% ,2% .3% NaF. Each group were obeserved and photographed at once , at 1 week, 4 weeks, 12 weeks,24 weeks after etching.ResultsFluoride on the enamel surface was detected by scanning electron microscopy in the fluoridated etching group.ConclusionThe effect of the fluoride contained etching has been confirmed. Fluoridated etching containing 3 % NaF on enamel surface has the best effect of preventing the enamel from demineralization.