Single-step, self-etch adhesives behave as permeable membranes after polymerization. Part III. Evidence from fluid conductance and artificial caries inhibition.

Abstract

PURPOSE:

To test the hypothesis that formation of inhibition zones by bonded restorations in artificially-induced carious dentin lesions is related to the permeability of the self-etch adhesives.

METHODS:

Fluid conductance of four single-step self-etch adhesives (Prompt L-Pop, Etch&Prime 3.0, One-Up Bond F and Reactmer Bond), and a control two-step self-etch adhesive (UniFil Bond) were measured after sound dentin surfaces were:(1) acid-etched; (2) polished to produce smear layers; (3) bonded with the adhesive; each at 20 cm hydrostatic pressure (hp). Osmotic fluid conductance was also determined for the bonded dentin after immersion in 4.8 M CaCl2 at 0 cm hp. For artificial caries inhibition, a non-fluoride releasing (NFR) two-step self-etch adhesive (UniFil Bond) and a fluoride-releasing (FR) single-step adhesive (Reactmer Bond) were used in combination with a NFR composite (Metafil CX) or a FR restorative material (Reactmer Paste). Artificial caries were induced in these restorations, from which 120 +/- 10 microm thick sections and the effect of caries inhibition were quantitatively assessed with polarizing light microscopy and image analysis.

RESULTS:

Fluid conductance after bonding with the single-step adhesives Prompt L-Pop and Etch&Prime 3.0 were not significantly different from those recorded from smear layer-covered dentin. Although better seals were achieved with One-Up Bond F and Reactmer Bond, fluid conductance at 20 cm hp was significantly higher than the two-step self-etch adhesive UniFil Bond. Osmotic conductance at 0 cm hp were not significantly different from normal fluid conductance at 20 cm hp. The sizes of artificial carious lesions in UniFil Bond were significantly higher irrespective of whether a FR or NFR composite was used. Significant reduction in lesion size occurred in Reactmer Bond with the use of a NFR composite, and even more so with the use of a FR composite.

• Authors: Anut Itthagarun, Franklin R Tay, David H Pashley, James S Wefel, Franklin García-Godoy, Stephen H Y Wei
• Journal: American journal of dentistry (Am J Dent) Vol. 17 Issue 6 Pg. 394-400 (Dec 2004) ISSN: 0894-8275 [Print] United States
• PMID: 15724748 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Cariostatic Agents
• Composite Resins
• Dentin-Bonding Agents
• Etch&Prime 3.0
• Glass Ionomer Cements
• Membranes, Artificial
• Metafil C
• Methacrylates
• One-Up-Bond F
• Phosphates
• Prompt L-Pop
• Resin Cements
• Unifil Bond
• reactmer bond
• Ethanol
• Fluorides

Topics

• Acid Etching, Dental
• Cariostatic Agents (chemistry)
• Composite Resins (chemistry)
• Dental Bonding
• Dental Caries (pathology, prevention & control)
• Dentin (metabolism)
• Dentin-Bonding Agents (chemistry)
• Ethanol (chemistry)
• Fluorides (chemistry)
• Glass Ionomer Cements (chemistry)
• Humans
• Hydrostatic Pressure
• Materials Testing
• Membrane Fluidity
• Membranes, Artificial
• Methacrylates (chemistry)
• Osmosis
• Permeability
• Phosphates (chemistry)
• Resin Cements (chemistry)
• Rheology
• Smear Layer