Abstract

Recently, a Mixture of Tetracycline, an Acid, and a Detergent (MTAD) has been advocated to remove smear layer and disinfect canals. The purpose of this study was to evaluate the effect of MTAD the flexural strength and modulus of elasticity of dentin as well as its effect on the bond strength to enamel and dentin. In Part I, dentin bars were randomly assigned to eight groups treated either with various concentrations of NaOCl (5.25%, 2.65%, 1.31%, 0.66%), 17% EDTA, MTAD, saline, or according to a clinical protocol with 1.3% NaOCl and then 5 min of MTAD. Specimens were subjected flexural strength and modulus of elasticity tests. Data was analyzed using one-way ANOVA, Scheffés multiple comparisons procedure, and the two-sample t-test (α = 0.05). In Part II, immediate enamel and dentin sheer bond strength was tested. Before bonding composite using Optibond Solo Plus (Kerr), one of the following surface treatments was used: 1 min NaOCl (5.25%)/1 min EDTA(17%); 1 min NaOCl (5.25%)/1 min MTAD; 15 s etch with H3PO4 (positive control); 2 min saline (negative control); or 20 min NaOCl(1.3%)/ 5 min MTAD (clinical protocol for MTAD). Data was analyzed using one-way ANOVA, Student-Newman-Keuls method, and the two-sample t-test (α = 0.05). There was no significant difference in flexural strength and modulus of elasticity between the dentin bars exposed to saline, various concentrations of NaOCl or MTAD per clinical protocol (p > 0.05). Surface pre-treatment with acid etch resulted in the greatest enamel bond strengths (p < 0.05). All surface pre-treatments were superior to saline for dentin bonding (p < 0.05). Results indicated that MTAD could be used as prescribed for clinical use without affecting the tested physical properties of the tooth structure.

Department

Dentistry

School

Graduate School

First Advisor

Mahmoud Torabinejad

Second Advisor

Carlos Munoz

Third Advisor

Shahrokh Shabahang

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

2003

Date (Title Page)

6-2003

Language

English

Library of Congress/MESH Subject Headings

Dental Bonding; Dentin; Citric Acid -- pharmacology; Dental Pulp -- drug effects; Dentin Solubility -- drug effects; Roots Canal Irrigants -- pharmacology; Solubility -- drug effects; Smear Layer

Type

Thesis

Page Count

viii; 57

Digital Format

PDF

Digital Publisher

Loma Linda University Libraries

Usage Rights

This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.

Collection

Loma Linda University Electronic Theses and Dissertations

Collection Website

http://scholarsrepository.llu.edu/etd/

Repository

Loma Linda University. Del E. Webb Memorial Library. University Archives

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