Effect Of Two Kinds Enamel Adhesives On Demineralization Around Orthodontic Bonding Agents And Fluoride Level

Objective:To compare the effect of two kinds enamel adhesives on enamel demineralization around brackets and the fluoride level, and compare the effect of extrinsic fluoridated dentifrice on the demineralization of each material.Methods:1. In vitro, extracted premolars were divided into four groups. Orthodontic brackets were bonded with enamel adhesives. Teeth of group 1 and group 2 were bonded with Jingjin enamel adhesive, group 3 and group 4 with ESPE. The teeth were subjected to PH cycling, over a 30-day period. Teeth of group 1 and group 3 were immersed in fluoridated dentifrice for 3 minutes each day. Fluoride release was measured using fluoride ion-selective electrode. After 30 days they were assessed visually for enamel caries index. After a week carried index were assessed again to evaluate the consistence using Kappa analysis. We use the SPSS 11.5 soft kit to make one-way analysis of variance (ANOVA) to analyze the fluoride level and carried index.2. In vivo, 5 orthodontic patients were scheduled to have premolars extracted. Maxillary left premolar and mandibular right premolar were bonded with ESPE, and the others two were bonded with Jingjin enamel adhesives. They were told to use fluoridated dentifrices of the same trademark 3 times each day. After 30 days, the teeth were extracted and longitudinally sectioned to measure cross-sectional microhardness to assess the extend of enamel demineralization. The correlation coefficient between them is 0.91. We use the SPSS 11.5 soft kit to make paired t test to evaluate the difference between adhesives. Then we make factorial...