Adhesion promoting dental materials

Abstract

Abstract POLYMERIZABLE LIQUID CONDENSATION PRODUCTS THAT ARE ALSO SURFACE-ACTIVE CAN BE USED FOR DENTAL MATERIALS AS PRIMERS OR AS MONOMERS TO MEDIATE ADHESIVE BONDING BETWEEN PARTICULATE FILLERS AND BETWEEN POLYMERIZING FORMULATIONS AND SURFACES SUCH AS TOOTH STRUCTURE. PREFERRED THE ACID-CATALYZED CONDENSATION PRODUCTS ARE (I) 2-METHACRYLOXYETHYL VANILLATE. (II) 2 - METHACRYLOXYETHYL-P-HYDROXYBENZOATE, AND (III) 2-METHACRYLOXYETHYL GALLATE. WHEN SURFACES OF EXTRACTED TEETH WERE WETTED WITH THE MINIMAL AMOUNT OF VISCOUS LIQUID (I) AND A HARDENING DIMETHACRYLATE COMPOSITE MATERIAL WAS APPLIED, THE AVERAGE TENSILE BOND STRENGTH WAS SIGNIFICANTLY RAISED (FROM 18 TO 30 KG. F./CM.**2). THE MECHANISM APPEARS TO BE THAT THE ELECTRON-WITHDRAWING EFFECT OF THE CARBOXYLATE GROUP IN THE AFOREMENTIONED COMPOUNDS AND IN OTHER SIMILAR COMPOUNDS ENCOMPASSED IN THE SCOPE OF THIS INVENTION DEACTIVATES THE PHENOLIC HYDROXYL GROUP TOWARD DEGRADATIVE CHAIN TRANSFER WITH FREE RADICALS TO THE EXTENT THAT THE COMPOUNDS HOMOPOLYMERIZE AND COPOLYMERIZE RAPIDLY WHEN INITIATED WITH AN AMINEPEROXIDE SYSTEM OR WITH OTHER FREE RADICAL GENERATING INITIATOR SYSTEMS. IN CONTRAST WITH EUGENOL, WHEN PRODUCT (I) CONTAINING 0.6% OF N,N-DIMETHYL-SYMM-XYLIDINE WAS MIXED WITH ZINC OXIDE POWDER CONTAINING 1.0% BENZOYL PEROXIDE, IT HARDENED IN ABOUT 4 MINUTES AND HAD AN AVERAGE DIAMETAL TENSILE STRENGTH OF 154KG. F./CM.**2 AND AN AVERAGE COMPRESSIVE STRENGTH OF 1180 KG. F./CM**2.

Inventors

• 👤 Rafael L Bowen

Bibliographic Details