Abstract
The objective of this study was to assess the effect of a UV light-based auxiliary illumination on adhesive remnant (AR) removal after orthodontic debonding. Sixty human molars were divided according to the adhesive used for bonding: O-opaque; LF-low fluorescence; and HF-high fluorescence. After debonding, the teeth were subdivided according to the AR removal method: No UV light or With UV light. After AR removal, the teeth were polished. Direct visual analysis, scanning electron microscopy (SEM) and time quantification for AR removal analyses were performed (Fisher-Freeman-Halton, Fisher's exact, chi-square trend, ANOVA, and independent t-tests; α = 5%). Concerning the adhesives, there was no significant difference among direct visual, SEM and time analyses for AR removal (p ≥ 0.05). Regarding AR removal methods, a similarity among the subgroups was verified for direct visual and SEM analyses (p≥0.05). However, a significant trend was verified for the with UV light method to produce greater marks, and the no UV light method, to produce a greater rate of samples with AR before polishing (p = 0.015). AR removal with light was significantly quicker in comparison with the no UV light method (p < 0.0001). The use of UV light may aid orthodontists in removing AR more thoroughly and in less time. However, they should receive special training to apply this technology, and should never dismiss the final polishing procedure.
Highlights
Composite resins are the material of choice for direct bonding of orthodontic accessories, because they present the highest values of bond strength to enamel.[1]
The results obtained by direct visual analysis, after adhesive remnants (AR) removal and after polishing (Table 1), show no significant difference among the different adhesive systems used (O, LF, and HF; p = .07 and p = .41, respectively) or between the different AR removal methods (NL and With light (WL); p = .05 and p = .151, respectively)
A threshold value was verified in the comparison between the removal methods (NL and WL) using direct visual assessment after AR removal (p = .05)
Summary
Composite resins are the material of choice for direct bonding of orthodontic accessories, because they present the highest values of bond strength to enamel.[1]. All the techniques for removing AR after debonding of orthodontic accessories are known to produce different degrees of polishing, and to. Introduce some type of abrasion along with several degrees of enamel loss. To this end, the search for an efficient and safe method for removing AR after debonding has resulted in the introduction of a wide variety of instruments and procedures.[4]
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