Document Type

Thesis

Date of Award

12-31-1990

Degree Name

Master of Science in Chemical Engineering - (M.S.)

Department

Chemical Engineering, Chemistry and Environmental Science

First Advisor

David S. Kristol

Second Advisor

James A. Stackhouse

Third Advisor

Richard Clyde Parker

Abstract

A new kind of dental adhesive, O-Chlorophenol-TDI-HEMA-Pentaerythritol (TDI), was studied under long term conditions. The test was done in human third molar teeth which had been extracted 7 days to 6 months. Both citric acid and non citric acid pre-treatments were used on dentin surfaces. Based on Causton's[9] mineralizing solution pre-treatment method, we have used 3 kinds of mineralizing solutions, ITS, 0.5% CaCl2, NaF, as pre-treatment solutions. There were no significant differences between the citric acid and non citric acid pre-treatment. The ITS mineralizing solution pre-treatment caused a large increase in bond strength. The average bond strength of 1791 psi after 24 hrs in 0.9% saline solution fell to 625 psi after 6 month in the saline solution. When compared with five commercial dentin bonding agents under the same conditions, the TDI produced the highest bond strengths.

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