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Ultrastructure of the dentin-adhesive interface after acid-base challenge
Satoko Tsuchiya1, Toru Nikaido, Hidekazu Sonoda
1Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
The Journal of Adhesive Dentistry
|November 13, 2004
Summary
This study examined dental adhesive interfaces after acid-base challenges. Fluoride-releasing materials showed resistance, but some bonding resins degraded, impacting restoration longevity.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- Dental restorations face challenges from oral environment acidity and basicity.
- Understanding adhesive interface behavior under chemical challenge is crucial for long-term restoration success.
- Secondary caries prevention relies on material durability and interface integrity.
Purpose of the Study:
- To investigate the ultrastructure of the dentin-adhesive interface following sequential in vitro acid-base challenges.
- To evaluate the chemical resistance of different dental adhesive systems and restorative materials.
- To correlate interface morphology with material properties and potential for secondary caries prevention.
Main Methods:
- Box-shaped cavities in bovine root dentin were restored with four different adhesive systems: Reactmer Bond/Paste (RB/RP), Clearfil SE Bond/AP-X (SE/APX), ABF/APX, and Single Bond/APX (SB/APX).
- Specimens underwent a sequential in vitro challenge: immersion in artificial demineralizing solution (pH 4.5) followed by 5% NaOCl.
- Scanning Electron Microscopy (SEM) with argon-ion etching and gold sputtering was used to examine the dentin-adhesive interface ultrastructure.
Main Results:
- Tight bonding was observed between cavity wall dentin and adhesive for all groups.
- The fluoride-releasing RB/RP showed an acid-resistant zone, but the RB bonding resin degraded.
- Self-etching systems (SE/ABF) exhibited a thin acid-base resistant dentin layer (<1 µm) beneath the hybrid layer.
- The wet bonding system (SB) showed partial degradation of the hybrid layer, while SE/APX and ABF/APX bonding resins were resistant.
Conclusions:
- SEM is effective for visualizing adhesive reactions to acid-base challenges.
- Restoration longevity and secondary caries prevention are influenced by restorative material properties, hybrid layer quality, and fluoride release.
- Different adhesive systems exhibit varying resistance to chemical challenges, impacting their clinical performance.