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Effects of primer excess on marginal adaptation, nanoleakage and bond strength of adhesive systems after aging
Barreto, Suelem Chasse; Barbosa, Isabel Ferreira; Pereira, Gisele Damiana da Silveira; Dias, Carlos Tadeu dos Santos; Paulillo, Luís Alexandre Maffei Sartini.
Afiliación
  • Barreto, Suelem Chasse; University of Campinas. Piracicaba Dental School. Piracicaba. BR
  • Barbosa, Isabel Ferreira; University of Campinas. Piracicaba Dental School. Piracicaba. BR
  • Pereira, Gisele Damiana da Silveira; Universidade Federal do Rio de Janeiro. Faculdade de Odontologia. Department of Clinical Dentistry. Rio de Janeiro. BR
  • Dias, Carlos Tadeu dos Santos; University of São Paulo. Escola Superior de Agronomia Luiz de Queiroz. Department of Statistical Mathematics. Piracicaba. BR
  • Paulillo, Luís Alexandre Maffei Sartini; University of Campinas. Piracicaba Dental School. Department of Restorative Dentistry. Piracicaba. BR
Braz. j. oral sci ; 18: e191456, jan.-dez. 2019. ilus
Article en En | LILACS, BBO | ID: biblio-1087864
Biblioteca responsable: BR218.1
ABSTRACT
There is no consensus about the amount of primer inserted into the cavity.

Aim:

This study aimed to evaluate the effects of the amount of primer used on dentin microtensile bond strength (µTBs), nanoleakage and marginal sealing, following thermomechanical aging.

Methods:

48 human third molars were selected and a box-shaped class I cavity was constructed to maintain enamel margins. Teeth were randomly assigned to 6 experimental groups (n=8). For the bonding protocols of the restorative procedure, two adhesive systems were used three-step etch-and-rinse and two-step self-etch. Epoxy resin replicas of the occlusal surface were made, and the specimens were submitted to thermomechanical aging. Newer replicas were obtained after thermomechanical aging, and marginal adaptation was observed using SEM. To obtain sections (0.7 x 0.7 mm) for testing at a tension of 0.5 mm/min, teeth were serially sectioned in the buccallingual direction, parallel to the occlusal surface. Failure mode was then obtained. For nanoleakage evaluation, one section of each tooth was immersed in AgNO3 and evaluated using SEM. The µTBs data were submitted to a two-way ANOVA and Tukey's test (α= 0.05)

Results:

One drop of primer promoted higher µTBs than two or three drops. Besides, the three-step etch-and-rinse promoted greater µTBs (19.78) than the two-step self-etch adhesive (12.23). The increase in the amount of primer was directly proportional to the increase of infiltration. All groups exhibited more gaps after thermomechanical aging.

Conclusion:

Using an excess of primer is not recommended because it reduces the µTBs and forms an unsatisfactory hybrid layer
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Texto completo: 1 Colección: 01-internacional Base de datos: BBO / LILACS Asunto principal: Resistencia a la Tracción / Recubrimientos Dentinarios / Filtración Dental Idioma: En Revista: Braz. j. oral sci Asunto de la revista: ODONTOLOGIA Año: 2019 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Brasil
Texto completo
Añadir a Mi BVS
Imprimir
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Texto completo: 1 Colección: 01-internacional Base de datos: BBO / LILACS Asunto principal: Resistencia a la Tracción / Recubrimientos Dentinarios / Filtración Dental Idioma: En Revista: Braz. j. oral sci Asunto de la revista: ODONTOLOGIA Año: 2019 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Brasil