Is the bonding of self-adhesive cement sensitive to root region and curing mode?
J. appl. oral sci
; 25(1): 2-9, Jan.-Feb. 2017. tab, graf
Article
em En
| LILACS, BBO
| ID: biblio-841167
Biblioteca responsável:
BR1.1
ABSTRACT
Abstract Objectives To evaluate the influence of two curing techniques on the degree of conversion (DC) of resin cements and on bond strength (BS) of fiber posts in different regions of root dentin. Material and Methods Twenty single-rooted premolars were endodontically treated, and the post spaces were prepared. The roots were randomly divided into two groups (n=10), according to the activation mode of the resin cement RelyX™ U200 (3M ESPE Saint Paul, MN, USA) conventional (continuous activation mode) and soft-start activation mode (Ramp). The posts (WhitePost DC/FGM) were cemented according to the manufacturer’s recommendations and, after one week, the roots were cross-sectioned into six discs each of 1-mm thickness, and the cervical, medium, and apical thirds of the root canals were identified. The DC was evaluated under micro-Raman spectroscopy and the BS was evaluated by the push-out test. The data were analyzed by two-way ANOVA and Tukey’s test (α=0.05). Results Neither the activation mode nor the root regions affected the DC of the resin cement. Higher BS was achieved in the soft-start group (p=0.036); lower BS was observed in the apical third compared to the other root regions (p<0.001). Irrespective of the activation mode and root region, the mixed failure mode was the most prevalent. Conclusion The BS of fiber posts to root canals can be improved by soft-started polymerization. The DC was not affected by the curing mode.
Palavras-chave
Texto completo:
1
Índice:
LILACS
Assunto principal:
Técnica para Retentor Intrarradicular
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Cimentos de Resina
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Cavidade Pulpar
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Autocura de Resinas Dentárias
Tipo de estudo:
Clinical_trials
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Diagnostic_studies
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Evaluation_studies
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Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
J. appl. oral sci
Assunto da revista:
ODONTOLOGIA
Ano de publicação:
2017
Tipo de documento:
Article