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CO2 laser irradiation for debonding ceramic orthodontic brackets
Matos, Denise Souza; Küchler, Erika Calvano; Borsatto, Maria Cristina; Matsumoto, Mirian Aiko Nakane; Marques, Fernanda Vicioni; Romano, Fábio Lourenço.
  • Matos, Denise Souza; University Center of Patos de Minas. School of Dentistry. Patos de Minas. BR
  • Küchler, Erika Calvano; University of São Paulo. School of Dentistry of Ribeirao Preto. Department of Child Clinic. Ribeirão Preto. BR
  • Borsatto, Maria Cristina; University of São Paulo. School of Dentistry of Ribeirao Preto. Department of Child Clinic. Ribeirão Preto. BR
  • Matsumoto, Mirian Aiko Nakane; University of São Paulo. School of Dentistry of Ribeirao Preto. Department of Child Clinic. Ribeirão Preto. BR
  • Marques, Fernanda Vicioni; University of São Paulo. School of Dentistry of Ribeirao Preto. Department of Child Clinic. Ribeirão Preto. BR
  • Romano, Fábio Lourenço; University of São Paulo. School of Dentistry of Ribeirao Preto. Department of Child Clinic. Ribeirão Preto. BR
Braz. dent. j ; 32(2): 45-52, Mar.-Apr. 2021. tab, graf
Article in English | LILACS, BBO | ID: biblio-1339328
ABSTRACT
Abstract This study evaluated shear bond strength (SBS), adhesive remnant index (ARI) and fracture mode of chemically and mechanically retained ceramic brackets bonded with different composite resins and irradiated with CO2 laser. The null hypothesis was that ceramic brackets bonded with different composite resins and irradiated with CO2 laser would have similar SBS values. Ninety human premolars were divided into four experimental groups according to the combination of type of composite resin (Transbond XT and Z 250) and type of ceramic bracket (Fascination and Mystique), and two control groups (n=15). In the four experimental groups, the brackets were irradiated with CO2 laser at 10 W for 3 seconds before SBS testing. Enamel surface ARI was calculated after debonding under electron microscopy scanning. ANOVA and the Mann-Whitney test were used for statistical analysis. The laser groups had lower SBS values than the non-irradiated groups (control) (p<0.05). The mechanically retained brackets (Mystique) had the higher (p<0.05) and Z250 had the lower SBS values after CO2 laser irradiation. The groups bonded with Z250 had the highest ARI. Adhesive fractures were the most prevalent. The null hypothesis was rejected. CO2 laser decreased SBS efficiently and facilitated debonding of mechanically and chemically retained ceramic brackets.
RESUMO
Resumo O objetivo do estudo foi avaliar a resistência de união ao cisalhamento da colagem (RCC), o índice de remanescente de adesivo (IRA) e o modo de fratura de bráquetes cerâmicos com retenção química e mecânica colados com diferentes compositos e irradiados com laser de CO2. A hipótese nula testada foi que bráquetes colados com diferentes compósitos e irradiados com laser de CO2 apresentam valores semelhantes de RCC. Noventa pré-molares humanos foram divididos em 6 grupos (n=15) 2 controles e 4 experimentais que se diferenciaram pelo tipo de bráquete ceramic (Fascination and Mystique) e pelo compósito de fixação (Transbond XT e Z 250). Nos quatro grupos experimentais, os bráquetes foram irradiados com laser de CO2 com 10W por 3 segundos anteriormente ao teste de RCC. O IRA das superficies de esmalte foram avaliados após a descolagem e submetidos a análise em microscopia electrônica de varredura (MEV). Para análise estatística foram utilizados ANOVA e o teste de mann-Whitney. Os grupos laser mostraram valores de RCC menores que os grupos não irradiados (controles) (p<0.05). Os bráquetes com retenção mecânica (Mystique) mostraram alta RCC (p<0.05) e o compósito Z 250 obteve os mais baixos valores de RCC após irradiação com laser. Os grupos colados com o compósito Z 250 apresentaram os mais altos escores do IRA. O modo de fratura mais prevalente foi a adesiva. A hipótese nula foi rejeitada. O laser de CO2 foi eficaz para diminuir os valores de RCC e facilitou a descolagem dos bráquetes cerâmicos de retenção química e mecânica
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Full text: Available Index: LILACS (Americas) Main subject: Orthodontic Brackets / Lasers, Gas Limits: Humans Language: English Journal: Braz. dent. j Journal subject: Dentistry Year: 2021 Type: Article Affiliation country: Brazil Institution/Affiliation country: University Center of Patos de Minas/BR / University of São Paulo/BR

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Full text: Available Index: LILACS (Americas) Main subject: Orthodontic Brackets / Lasers, Gas Limits: Humans Language: English Journal: Braz. dent. j Journal subject: Dentistry Year: 2021 Type: Article Affiliation country: Brazil Institution/Affiliation country: University Center of Patos de Minas/BR / University of São Paulo/BR