00000ctm a22000003a 4500 UP-1685523046126167352 Buklod 20250915153346.0 m |o d | cr ||||||||||| 250915s xx d |||| || | (iLib)UPMNL-00010543564 UPDent Rda eng LG 995 2007 D45 V34 Vahdani, Vahid. An evaluation of the enamel surface after debonding, polishing and application of the different remineralizing agents a scanning electron microscopic study Vahid Vahdani. 167 leaves. Thesis (Master of Science in Dentistry)--University of the Philippines Manila. Abstract:The purpose of this in vitro study were to evaluate the enamel surface structure subjected to various debonding techniques, clean-up procedures for residual adhesive removal and final polishing procedure with pumice and rubber cup. In addition, the ability of two commercially-available remineralizing agents to inhibit demineralization and promote remineralization was also assessed. Othodontic brackets were bonded to fifty six (56) experimental teeth using Ormco Blugloo light-cured adhesive material. Enamel surface structures were examined with a scanning electron microscope at X 30 and X 200 magnifications. Subsequent to debonding, clean-up and polishing procedures the SEM photomicrographs were assessed using Adhesive Remnants Index (ARI) and Enamel Surface Index (ESI). In order to assess the ability of the two commercially available remineralizing agents in inhibiting demineralization and promoting remineralization, the SEM photomicrographs were qualitatively assessed by means of the Energy Dispersive X-ray Analysis (EDX). A non-parametric statistical method using STATA software was utilized for Stages 2 and 3. A Fisher Exact Test was used to determine the difference in proportion among the three different clean-up techniques and the conditions of enamel surface. At the fourth stage, a comparison between the control and the test sections was done using Mann-Whiteny U test and between test immediately after application and after 48 hours of the same treatment, a Wilcoxon sign-rank test was utilized. Results of this study revealed that the risk of enamel fracture from using the Ormco bracket removing plier and 3M Unitek Lift-Off debracketing instrument is particularly low, since all the fracture sites repeatedly occurred along the bracket/adhesive interface. However, more bracket distortion was seen on the brackets debonded with Ormco bracket removing plier. After adhesive remnants removal, the slow speed tungsten carbide bur produced higher percentage of both satisfactory and acceptable enamel surfaces. This was followed by high speed white stone bur and slow speed medium grade Softex disc. Final polishing with pumice and rubber cup restored the enamel surface structure close to its original appearance on those specimens subjected to slow speed tungsten carbide fur. The Mann-Whiteny U test result revealed that the uptake of calcium and phosphate from G.C Tooth Mousse (Recaldent) and the fluoride uptake from Bifluorid 12 was significant higher on specimens under slow speed tungsten carbide bur category. On the basis of the findings of this study, it can be concluded that orthodontic brackets can be debonded with either Ormco bracket removing plier or 3M Unitek Lift-Off debracketing instruments. The use of slow speed tungsten carbide bur, for the removal of remnants followed by polishing procedure with pumice and rubber cup, produced significantly greater proportion of satisfactory and acceptable enamel surfaces that the other techniques investigated. Furthermore, the percentages of calcium-phosphate and fluoride concentrations were significantly higher on those specimens under the slow speed tungsten carbide bur category. Orthodontics. Dental enamel. FI UPMNL DENT LG 995 2007 D45 V34 Thesis