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Effect of fluoride solutions on the shear bond strength of orthodontic brackets
Leódido, Gabriela da Rocha; Fernandes, Hianna Oliveira; Tonetto, Mateus Rodrigues; Presoto, Cristina Dupim; Bandéca, Matheus Coêlho; Firoozmand, Leily Macedo.
  • Leódido, Gabriela da Rocha; Maranhão University Center. Dental School. Department of Restorative Dentistry. São Luis. BR
  • Fernandes, Hianna Oliveira; Maranhão University Center. Dental School. Department of Restorative Dentistry. São Luis. BR
  • Tonetto, Mateus Rodrigues; Maranhão University Center. Dental School. Department of Restorative Dentistry. São Luis. BR
  • Presoto, Cristina Dupim; Maranhão University Center. Dental School. Department of Restorative Dentistry. São Luis. BR
  • Bandéca, Matheus Coêlho; Maranhão University Center. Dental School. Department of Restorative Dentistry. São Luis. BR
  • Firoozmand, Leily Macedo; Maranhão University Center. Dental School. Department of Restorative Dentistry. São Luis. BR
Braz. dent. j ; 23(6): 698-702, 2012. tab
Article in English | LILACS | ID: lil-662429
Responsible library: BR1.1
ABSTRACT
The aim of this in vitro study was to evaluate the shear bond strength of brackets after pre-treatment with different fluoride solutions. This study used 48 freshly extracted sound bovine incisors that were randomly assigned to 4 experimental groups (n=12). CG (control) without treatment; NF 4 min application of neutral fluoride; APF application of 1.23% acidulated phosphate fluoride (APF) for 4 min; and SFV application of 5% sodium fluoride varnish for 6 h. For each group, after surface treatment, prophylaxis of enamel and bracket bonding with Transbond XT composite resin (3M) were performed following the manufacturer's specifications. The shear bond strength was performed with a universal testing machine 24 h after fixing the brackets. The tooth surfaces were analyzed to verify the adhesive remnant index (ARI). Data were analyzed statistically by ANOVA and Tukey's test (α=0.05). There was statistically significant difference among the groups (p<0.0001). CG and NF groups presented significantly higher bond strength than APF and SFV. There was no significant difference between CG and NF or between APF and SFV (p>0.05). The analysis of ARI scores revealed that most failures occurred at the enamel-resin interface. It may be concluded that the pre-treatment of enamel with 1.23% APF and 5% SFV prior to fixing orthodontic brackets reduces shear bond strength values.
RESUMO
O objetivo deste estudo foi o de avaliar in vitro a resistência adesiva de bráquetes após o pré-tratamento do esmalte com diferentes soluções fluoretadas. Foram utilizados 48 incisivos bovinos hígidos recém-extraídos que foram aleatoriamente divididos em 4 grupos experimentais (n=12). CG (controle) sem tratamento; FN aplicação de flúor neutro por 4 min; FFA aplicação de flúor fosfato acidulado (FFA) a 1,23% por 4 min; e VFS aplicação de verniz de fluoreto de sódio a 5% por 6 h. Após o tratamento dos grupos, foi realizada a profilaxia do esmalte e os bráquetes foram fixados utilizando o compósito Transbond XT (3M), seguindo as especificações do fabricante. A resistência adesiva foi verificada através do teste de cisalhamento, realizado na Máquina de Ensaio Universal DL-2000 24 h após a fixação dos bráquetes. As superfícies dos dentes foram analisadas para verificação do índice de adesivo remanescente (IAR). Por meio dos testes estatísticos ANOVA e Tukey (α=5%), observou-se diferença estatisticamente significante entre os grupos estudados (p<0,0001), sendo que GC e FN, apresentaram valores superiores de resistência adesiva quando comparados aos grupos FFA e VFS, porém GC-NF e FFA-VFS não apresentaram diferenças estatisticas entre si (p>0,05). A análise dos escores do IAR revelou que grande parte das falhas ocorreram na interface esmalte-resina. Conclui-se que o tratamento do esmalte com FFA 1,23% e VFS a 5%, previamente à fixação de bráquetes ortodônticos, reduziu os valores de resistência adesiva ao cisalhamento.
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Full text: Available Index: LILACS (Americas) Main subject: Cariostatic Agents / Dental Bonding / Orthodontic Brackets / Fluorides Limits: Animals Language: English Journal: Braz. dent. j Journal subject: Dentistry Year: 2012 Type: Article / Project document Affiliation country: Brazil Institution/Affiliation country: Maranhão University Center/BR

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Full text: Available Index: LILACS (Americas) Main subject: Cariostatic Agents / Dental Bonding / Orthodontic Brackets / Fluorides Limits: Animals Language: English Journal: Braz. dent. j Journal subject: Dentistry Year: 2012 Type: Article / Project document Affiliation country: Brazil Institution/Affiliation country: Maranhão University Center/BR