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Journal of Dental Research
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Modified Surface-active Monomers for Adhesive Bonding to Dentin

S. Venz

American Dental Association Health Foundation, Paffenbarger Research Center

B. Dickens

Polymers Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899

PMGDM, a PMDM-type adhesive monomer, was synthesized from pyromellitic dianhydride and glycerol dimethacrylate. Only the para isomer of PMDM, a solid, is used in dental adhesives. The adhesive monomer PMGDM is a liquid and consists of a mixture of para- and meta isomers.

This study shows that PMGDM has several advantages over PMDM. For example, the adhesive can be applied at a greater thickness, and additives and/or additional initiators for improved curing can be incorporated. Use of the liquid monomer PMGDM also provided a convenient means of varying the thickness of the adhesive layer between dentin and composite. The adhesive bonds were tested in both shear and tensile modes. PMDM was used as the control.

The reliability of the bonds, as judged from the Weibull modulus and Weibull characteristic strength, was improved by (1) use of more concentrated solutions of PMGDM adhesive, (2) use of an adhesive thickness of about 25 µm, and (3) modification of PMGDM with a diluent monomer which is expected to enhance the degree of cure and/or the dentin-wetting properties of the adhesive resin.

Journal of Dental Research, Vol. 72, No. 3, 582-586 (1993)
DOI: 10.1177/00220345930720030501
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