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Epinephrine permeation across dentin in vitro.
A E Ciarlone1, L Tao, D Ziemer
1Medical College of Georgia, School of Dentistry, Department of Oral Biology, Augusta.
Endodontics & Dental Traumatology
|February 1, 1991
Summary
Epinephrine permeation through human dentin is slower with thicker dentin and a present smear layer. Removing the smear layer and reducing dentin thickness significantly increases epinephrine diffusion.
Area of Science:
- Biomaterials Science
- Dental Pharmacology
- Drug Delivery Systems
Background:
- Dentin acts as a barrier to drug permeation in dental applications.
- Understanding epinephrine diffusion is crucial for topical anesthetic efficacy.
- The smear layer's role in drug transport across dentin requires further investigation.
Purpose of the Study:
- To investigate the in vitro permeation of epinephrine across human dentin.
- To evaluate the impact of dentin thickness and smear layer on epinephrine diffusion.
- To determine the therapeutic relevance of topical epinephrine concentrations.
Main Methods:
- In vitro permeation study using human dentin discs of varying thicknesses.
- Dentin samples were tested with and without the presence of smear layers.
- Epinephrine concentrations were measured over time using quantitative analysis.
Main Results:
- Epinephrine was detected rapidly, reaching peak concentrations within 30-50 minutes.
- Epinephrine flux increased with decreased dentin thickness and removal of the smear layer.
- Half-time for steady-state diffusion (T 1/2) decreased with thinner dentin and no smear layer.
Conclusions:
- Dentin thickness and the smear layer significantly influence epinephrine permeation.
- Reduced dentin thickness and smear layer removal enhance epinephrine diffusion rates.
- Topical epinephrine at 1 mg/ml yields therapeutic concentrations, albeit with slow permeation.