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ORIGINAL RESEARCH
Year : 2019  |  Volume : 11  |  Issue : 1  |  Page : 28-32

Enamel surface roughness evaluation after debonding ceramic brackets: Use of burs and abrasive systems for resin removal


1 Department of Dental Materials and Restorative Dentistry, São Leopoldo Mandic Research Institute, Campinas, São Paulo, Brazil
2 IMED Dental School, Passo Fundo, RS, Brazil

Correspondence Address:
Dr. Roberta Tarkany Basting
Faculdade São Leopoldo Mandic, Instituto De Pesquisas São Leopoldo Mandic, Área De Dentística, Rua José Rocha Junqueira, 13. Bairro Swift, Campinas, São Paulo
Brazil
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jioh.jioh_299_18

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Aim: This in vitro study aimed to evaluate enamel surface roughness after using burs and abrasive systems to remove residual resin after ceramic bracket debonding. Materials and Methods: Ceramic brackets (Abzil/3M) were bonded to the proximal surfaces of 40 sound premolars using an orthodontic bonding agent (Transbond XT/3M). After 30 days, brackets were debonded. All surfaces were classified according to adhesive remnant index, and then distributed into four groups (n = 10) for the finishing procedures: (G1) Komet H22GK bur at high speed, (G2) Komet H379AGK bur at low speed, (G3) Orthometric CF375R bur at high speed, (G4) Orthometric CB27 bur at low speed. All surfaces were polished using fine sandpaper and felt discs with diamond polishing paste (Diamond Excel/FGM). Enamel roughness was measured with a roughness meter in sequential mode at baseline (before bonding); after rest residual removal and polishing. Multiple comparisons were made using the Tukey–Kramer Test, with a significance level of 5%. Results: Analysis with mixed models for repeated measures, and the Tukey–Kramer test showed no significant difference in mean roughness values between groups (P = 0.6168) at each evaluation time. After finishing, the mean roughness values did not differ significantly from baseline values (P = 0.5565). After polishing, roughness values were significantly lower than in all other times (P < 0.0001) for all groups. Conclusions: Different burs used at high or low speed provided roughness values similar to those of sound enamel. However, polishing produced lower roughness values on enamel submitted to finishing only, also when compared with sound enamel.


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