Bonding to wet or dry deproteinized dentin: micro tensile bond strength and confocal laser micromorphology analysis
Braz. j. oral sci
;
8(4): 181-184, Oct.-Dec. 2009. tab, ilus
Article
in English
| LILACS, BBO
| ID: lil-578029
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 ANOVAand Tukeys 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-deproteinizedgroups. 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.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Sodium Hypochlorite
/
Tensile Strength
/
In Vitro Techniques
/
Composite Resins
/
Dentin
Limits:
Humans
Language:
English
Journal:
Braz. j. oral sci
Journal subject:
Dentistry
Year:
2009
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Federal University of Pelotas/BR
/
State University of Campinas/BR
/
University of Passo Fundo/BR
/
University of São Paulo/BR
/
University of Uberaba/BR
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