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The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title: Preparation and testing of blocked isocyanate dental adhesives
Author: Sweitzer, George W.
View Online: njit-etd1985-030
(115 pages ~ 3.3 MB pdf)
Department: Biomedical Engineering Committee
Degree: Master of Science
Program: Biomedical Engineering
Document Type: Thesis
Advisory Committee: Kristol, David S. (Committee chair)
Parker, Richard Clyde (Committee member)
Perlmutter, Howard David (Committee member)
Date: 1985-05
Keywords: Dental adhesives
Dental bonding
Isocyanates
Monomers
Polymers and polymerization
Availability: Unrestricted
Abstract:

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.


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