Date of Award
Master of Science in Biomedical Engineering - (M.S.)
Biomedical Engineering Committee
David S. Kristol
Richard Clyde Parker
Howard David Perlmutter
Three monomers were used in this study. Two were prepared from 2,4-toluene diisocyanate (TDI),2 hydroxyethyl methacrylate (HEMA), and either o-methoxyphenol, or o-chlorophenol. The third monomer was prepared from pentaerythritol, TDI, HEMA, and p-cresol.
These monomers were bonded to dentin slices, and then combined with an adhesive copolymer consisting of methyl methacrylate and poly(methyl methacrylate). This mixture was polymerized at room temperature by addition of N,N-dimethyl-p-toluidine, and benzoyl peroxide. This adhesive copolymer was applied to monomer coated slices of dentin, and to aluminum coupons already fixed in a jig. The monomer-coated dentin slices (treated with the adhesive copolymer) were then placed between two coupons secured in the upper and lower portions of the jig. The jig was then closed and a 2 Kg weight was placed on top. The sample specimens were allowed to cure for a specific length of time, then usually stored in water. After storage, the samples were pulled on a Scott CRE/500 tension tester.
Breaking strengths of up to 1889 psi were found when using o-methoxyphenol treated slices, after 96 hours wet.
Breaking strengths of up to 2175 psi were found when using o-chlorophenol treated slices, after 168 hours wet.
Breaking strengths of up to 2270 psi were found when using pentaerythritol and p-cresol treated slices, after 48 hours wet.
Sweitzer, George W., "Preparation and testing of blocked isocyanate dental adhesives" (1985). Theses. 2082.