Bonding to wet or dry deproteinized dentin: microtensile bond strength and confocal laser micromorphology analysis

Authors

  • Aloísio O. Spazzin Piracicaba Dental School, State University of Campinas
  • Daniel Galafassi University of São Paulo
  • Luciano S. Gonçalves University of Uberaba
  • Rafael R. Moraes Federal University of Pelotas
  • Bruno Carlini-Júnior University of Passo Fundo

DOI:

https://doi.org/10.20396/bjos.v8i4.8642041

Keywords:

Bonding agents, Dentin, Microscopy, Confocal, Sodium hypochlorite, Bond strength

Abstract

Aim: To investigate the influence of deproteinization and moisture condition (wet vs. dry) on the bond strength and micromorphology of resin-dentin bonding interfaces. Methods: Dentin surfaces were etched with 37% phosphoric acid for 15 s and rinsed with water. Four groups (n = 10) were tested: WET: dentin was left visibly moist; DRY: dentin was dried with compressed air; WET-D: dentin was deproteinized for 60 s using 10% NaOCl solution and left moist; DRY-D: dentin was deproteinized and dried. Prime&Bond 2.1 adhesive was applied and the teeth were restored with composite resin. Microtensile test was carried out after 24 h, and failure modes classified under magnification. Data were subjected to two-way ANOVA and Tukey’s test (P < 0.05). The bonding micromorphology was analyzed by confocal laser scanning microscopy. Results: The group DRY showed significantly lower bond strength (P < 0.05) than the other groups, which were similar to each other (P > 0.05). Adhesive failures were predominant. Analysis of micromorphology showed formation of a collagen-resin hybrid layer only for the non-deproteinized groups. Adhesive penetration into the dentinal tubules was deeper for the DRY-D compared to the WETD group. Conclusion: The bond strength was not dependent on the moisture condition and a more homogeneous hybridization was obtained when dentin was deproteinized

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Author Biographies

Aloísio O. Spazzin, Piracicaba Dental School, State University of Campinas

DDS, MS, Graduate student; Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, State University of Campinas

Daniel Galafassi, University of São Paulo

DDS, MS, Graduate student, Department of Restorative Dentistry, Ribeirão Preto Dental School, University of São Paulo

Luciano S. Gonçalves, University of Uberaba

DDS, MS, Professor, Department of Dental Materials and Restorative Dentistry, Dental School, University of Uberaba

Rafael R. Moraes, Federal University of Pelotas

DDS, MS, PhD, Professor; Department of Restorative Dentistry, Dental School, Federal University of Pelotas

Bruno Carlini-Júnior, University of Passo Fundo

DDS, MS, PhD, Professor; Department of Restorative Dentistry, Dental School, University of Passo Fundo

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Published

2015-12-02

How to Cite

1.
Spazzin AO, Galafassi D, Gonçalves LS, Moraes RR, Carlini-Júnior B. Bonding to wet or dry deproteinized dentin: microtensile bond strength and confocal laser micromorphology analysis. Braz. J. Oral Sci. [Internet]. 2015 Dec. 2 [cited 2022 Nov. 30];8(4):181-4. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8642041

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