Rationale behind the design and comparative evaluation of an all-in-one self-etch model adhesive.

Masafumi Kanehira, Werner J Finger, Hiroshi Ishihata, Marcus Hoffmann, Atsufumi Manabe, Hidetoshi Shimauchi, Masashi Komatsu

Journal: Journal of dentistry 2009;37(6):432-9

PMID: 19250732

Full Text on Elsevier Science View on PubMed

Abstract

OBJECTIVE

To investigate and compare bonding and dentin sealing efficacy of a marketed all-in-one and an experimental model adhesive with minimum effective amounts of acidic monomer and water.

MATERIALS AND METHODS

Composition of model adhesive (NAD) in mass%: UDMA (45), 4-META (20), H2O (7.5), and acetone (27.5). For characterization of a reasonable NAD application procedure shear bond strengths (SBS, n=8) were determined on human enamel and dentin. Clearfil S3 Bond (TSB; Kuraray) served as reference. SBSs were evaluated after 10 min, 1 and 7 days, and 1 month, marginal adaptation (n=8) was assessed in cylindrical butt-joint dentin cavities. Diffusive and convective water fluxes through 1mm thick adhesive-coated dentin disks (n=6) were qualitatively and quantitatively analyzed.

RESULTS

SBSs proved that application of NAD in one coat with 20s agitated dwell time was > or =20 MPa, enamel SBSs (24h) were 25 MPa, p>0.05. Dentin SBSs for TSB and NAD were not different (p>0.05) at the four stages (means: 18.9, 23.5, 25.4, and 23.6 MPa). Five and seven of the eight bonded restorations with TSB and NAD were gap-free (p>0.05). Dentin disks treated with EDTA from both sides or one side only were highly permeable for liquid, whereas adhesive-coated dentin disks showed no permeability at 0 and 2.5 kPa water pressure.

CONCLUSIONS

Within the limitations of this study the model adhesive tested represents a promising basic composition for all-in-one adhesives, eliminating common problems encountered with single step adhesives such as phase separation and permeability.

Address: Graduate School of Dentistry, Department of Restorative Dentistry, Division of Operative Dentistry, Tohoku University, Sendai, Japan.

DOI: 10.1016/j.jdent.2009.01.013

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MeSH Terms: Acetone, Adolescent, Adult, Chelating Agents, Chemistry, Pharmaceutical, Dental Bonding, Dental Enamel, Dental Marginal Adaptation, Dentin, Dentin Permeability, Dentin-Bonding Agents, Edetic Acid, Female, Humans, Hydrostatic Pressure, Luminescent Agents, Luminol, Male, Materials Testing, Methacrylates, Polyurethanes, Resin Cements, Shear Strength, Solvents, Stress, Mechanical, Time Factors, Water, Young Adult