Ultrastructural Correlates of in vivo/in vitro Bond Degradation in Self-etch Adhesives

The morphologic correlates of bond degradation in self-etching primers have not been fully elucidated. We hypothesized that there is no difference between the mechanism of degradation of self-etching primers in vivo and in vitro. Class I cavities prepared in vivo in 24 caries-free human molars were...

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Bibliographic Details
Published in:Journal of dental research 2005-04, Vol.84 (4), p.355-359
Main Authors: Donmez, N., Belli, S., Pashley, D.H., Tay, F.R.
Format: Article
Language:English
Subjects:
Analysis of Variance
Dental Bonding
Dental Etching - methods
Dental Leakage
Dental Restoration, Permanent - methods
Dental Stress Analysis
Dentin Permeability
Dentin-Bonding Agents - chemistry
Dentistry
Fluorides - administration & dosage
Humans
Materials Testing
Microscopy, Electron, Transmission
Research Design
Resin Cements - chemistry
Tensile Strength
Time Factors
Water
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Summary:The morphologic correlates of bond degradation in self-etching primers have not been fully elucidated. We hypothesized that there is no difference between the mechanism of degradation of self-etching primers in vivo and in vitro. Class I cavities prepared in vivo in 24 caries-free human molars were bonded with Clearfil SE Bond or Clearfil Protect Bond, and restored with resin composites. Eight teeth were extracted after 24 hrs, and the rest after 1 yr. The same protocol was repeated in vitro with extracted molars. Degradation of resin-dentin bonds was assessed by microtensile bond testing and TEM of interfaces after tracer immersion. Both in vivo and in vitro bond strengths decreased with time for SE Bond but not for Protect Bond, with more pronounced water treeing observed in the former adhesive under both aging conditions. There is no difference between the mechanism of degradation of self-etch adhesives in vivo or in vitro.
ISSN:0022-0345
1544-0591
DOI:10.1177/154405910508400412