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Morphological characterization of the resin-dentin interface in primary teeth
Christoph Kaaden1, Gottfried Schmalz, John M Powers
1Department of Operative Dentistry and Periodontology, University Clinics Regensburg, 93042, Regensburg, Germany. Kaaden@dent.med.uni-muenchen.de
Clinical Oral Investigations
|October 31, 2003
Summary
Self-etching adhesives showed varied effectiveness on primary teeth dentin. None of the evaluated dental adhesives created a completely sealed interface between composite resin and primary tooth dentin in vitro.
Area of Science:
- Dental Materials Science
- Pediatric Dentistry
- Adhesive Dentistry
Background:
- Primary dentition exhibits distinct morphological and compositional characteristics compared to permanent dentition.
- These differences may influence the performance of dental adhesives, necessitating specific evaluations for primary teeth.
Purpose of the Study:
- To investigate the in vitro effects of four self-etching dental adhesives on primary dentin.
- To assess the hybrid layer formation, adhesive layer integrity, and interface sealing capabilities of these adhesives on primary molars.
Main Methods:
- Eight dentin disks from primary molars were prepared and treated with four self-etching adhesives: Prompt L-PoP (LP), Clearfil SE BOND (SE), Etch&Prime 3.0 (EP), and Prime&Bond NT (PB) with phosphoric acid as control.
- Specimens underwent sectioning, fixation, HMDS drying, polishing, and Field Emission Scanning Electron Microscopy (FESEM) examination.
Main Results:
- Visible hybrid layers were observed with PB, LP, and EP adhesives, while SE showed no detectable interdiffusion zone.
- A continuous adhesive layer was identified for PB, EP, and SE, but not consistently for LP.
- All tested adhesive systems exhibited debonded regions, with distinct differences in failure modes observed across the groups.
Conclusions:
- The evaluated self-etching adhesives demonstrated variable efficacy in forming hybrid layers and adhesive layers on primary dentin.
- None of the tested dental adhesives achieved a complete seal at the interface between composite resin and primary tooth dentin in this in vitro study.