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Self-contamination of deep dentin by dentin fluid
1Faculty of Dentistry, Prince Philip Dental Hospital, The University of Hong Kong, Hong Kong SAR, China. aitthaga@hkusua.hku.hk
American Journal of Dentistry
|January 5, 2002
Summary
Anesthesia with epinephrine during dental procedures affects dentin surface hydration. Vasoconstrictor-containing anesthesia prevented fluid extrusion from dentin tubules after acid etching, unlike anesthetic without epinephrine.
Area of Science:
- Dental materials science
- Cariology
- Restorative dentistry
Background:
- Dentin conditioning with phosphoric acid is crucial for adhesive dentistry.
- Local anesthetics used in dentistry can influence the dentin surface microenvironment.
Purpose of the Study:
- To compare the surface morphology of acid-conditioned dentin after anesthesia with and without a vasoconstrictor.
Main Methods:
- Resin replica technique and scanning electron microscopy were used.
- Vital human molars with Class I caries were divided into two groups based on anesthetic type (with or without epinephrine).
- A total-etch technique with 32% phosphoric acid was applied.
Main Results:
- Anesthetic without epinephrine showed fluid extrusion from dentin tubules and an amorphous film.
- Anesthetic with epinephrine exhibited patent dentin tubules without fluid and odontoblast process-like structures.
- Control group (no acid etching) showed a granular smear layer.
Conclusions:
- Local anesthetic containing epinephrine may reduce dentin surface moisture during total-etch procedures.
- This finding could have implications for bonding effectiveness in restorative dentistry.