Characterization chemistry of the enamel treated with orthodontics adhesives

The risk of dental caries increases with the use of orthodontic appliances, and it does not only depend on a patientxs oral hygiene. Caries cause teeth enamel demineralization around to the orthodontic bracket. The chemical structure of enamel is not the only factor in the development of caries; the type of adhesive used to fix brackets may or may not reduce enamel demineralization. Previous studies have shown that a resin-modified glass ionomer (RMGI) inhibits demineralization. The objective: of this study was to evaluate the effect of a fluoride releasing bracket on the elements of enamel in regions adjacent to orthodontic brackets bonded with RMGI and composite resin cements.

Methods: 120 brackets were bonded in 120 premolars scheduled for extraction due to orthodontic reason in 30 patients (11-15 years old). Previous to initial bracket placement the subjects were randomly divide into 3 groups, using 3 adhesives: Group-1-Experimental: Fuji Ortho LC (GC America Inc, Chicago III), Group-2-Experimental: Bonding primer Ortho Solo (Ormco, Glendora, Calif.) and group-3-Control: Right On (TP Orthodontics Inc., La Porte, Indiana, USA). Extractions were scheduled to 4 weeks after initial bracket placement. The demineralization effect on teeth was assessed by measuring the characterization chemistry of the enamel adjacent to the bracket area by SEM as to energy-dispersive x-ray spectrometer (EDS). The statistical analysis was analyzed by U Mann – Whitney, standard deviation, minimums and maxims values.

Results: Findings statistically significant for the O and Na between group 1 and 2 p<0.05; O and Cl (group 2 and 3) p<0.05. Conclusion: The effect of the adhesives used in orthodontics produce chemistry changes in the superfice of the enamel adjacent to the bracket area.