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Acid-etching and Hydration Influence on Dentin Roughness and Wettability

Dental Materials Department, Granada University, 18071 Granada, Spain

G.W. Marshall

Division of Biomaterials and Bioengineering, Department of Restorative Dentistry, University of California, 707 Parnassus Avenue, San Francisco, CA, USA 94143-0758

S.J. Marshall

Division of Biomaterials and Bioengineering, Department of Restorative Dentistry, University of California, 707 Parnassus Avenue, San Francisco, CA, USA 94143-0758

L.G. Watanabe

Division of Biomaterials and Bioengineering, Department of Restorative Dentistry, University of California, 707 Parnassus Avenue, San Francisco, CA, USA 94143-0758

M. Toledano

Dental Materials Department, Granada University, 18071 Granada, Spain

M.A. Cabrerizo

Applied Physics Department, University of Granada, 18071 Granada, Spain

R. Osorio

Dental Materials Department, Granada University, 18071 Granada, Spain

Adhesion of restorative and protective materials to dentin is an important requirement for operative and preventive dentistry. Wettability and roughness are dentin substrate conditions that are critical to establishing good adhesion. This study examined superficial and deep dentin for variations in water contact angle measurements and roughness for polished, etched, dehydrated, and rehydrated states. Superficial and deep dentin disks from 6 non-carious third molars were prepared for AFM (Atomic Force Microscope) observation, roughness measurement, and contact angle measurements following specific treatments: hydrated and polished, etched (10% H3P04), dehydrated (desiccator for 24 hrs); and rehydrated (in water for 24 hrs). Contact angles were measured by means of the ADSA (Axisymmetric Drop Shape Analysis) technique with filtered and purified water of surface tension 72.79 ergs/cm2. The AFM was used to quantify the intertubular roughness. Mean and SD of roughness and contact angle were calculated for each dentin state, and two-way Repeated Measures ANOVA with Tukey's HSD multiple comparisons were performed at p < 0.05. Wetting and roughness both increased after etching, with roughness tending to increase further while wettability dramatically decreased after desiccation. After rehydration, water contact angle values were equivalent to those of the etched condition. Although intertubular roughness did not depend on depth, lower water contact angles were found for deep dentin. Depth and dehydration resulted in altered dentin substrates with exposed hydrophobic moieties that could interfere with bonding to hydrophilic primer coats.

Key Words: dentin • wettability • roughness • etching • hydration.

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Journal of Dental Research, Vol. 78, No. 9, 1554-1559 (1999)
DOI: 10.1177/00220345990780091001


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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Rosales, J.I. Articles by Osorio, R. Search for Related Content PubMed PubMed Citation Articles by Rosales, J.I. Articles by Osorio, R. Social Bookmarking                         What's this?