Sunil Ilapogu

Abstract

Various materials are used for the treatment of immature teeth that have been subjected to trauma or decay. It is not well established what effect these materials may have on the immature root dentin. A concern would be the resistance to fracture of the remaining root dentin. The purpose of this study was to compare the resistance of fracture of bovine teeth treated with sodium hypochlorite, calcium hydroxide, gray MTA and gray MTA in conjunction with MTAD after certain periods of time. One hundred and ninety five freshly extracted, intact bovine incisors were prepared using a modified Haapasalo and Orstavik technique. Each sample was randomly assigned to five different groups: 1) distilled water (control group), 2) 1.3% sodium hypochlorite, 3) calcium hydroxide paste (Pulpdent®), 4) gray mineral trioxide aggregate, 5) MTAD in conjunction MTA. Each group consisted of thirty nine teeth and was further divided into groups of thirteen (7-days, 30-days, and 90-days). Upon completion of their various time increments, thirteen specimens from each group were randomly selected and tested for fracture strength using an Instron machine. An additional control group was constructed after the study was completed. Seven samples were prepared in the exact manner as the control group and were tested two hours after being prepared. The data was statistically analyzed using a 1-way ANOVA, 2-way ANOVA test and a Student-Newman-Keuls Multiple comparison procedure. The 1-way ANOVA analysis showed that within groups 1-4 there was no statistical significant difference (NSD) when comparing the various time increments (7, 30, 90 days). As well there was NSD with in group 1 including the extra control time increment (0 day). However group 5 had a statistical significant difference between the 7-day and 30-day. There was NSD between the 30-day and 90-day time increment of group 5. The 2-way ANOVA displayed that the effect of treatment, time and the interaction of the two had a statistically significant affect on the outcome. The Student-Newman-Keuls Multiple comparison procedure also displayed no statistical difference between the control groups, 1.3% sodium hypochlorite group and the calcium hydroxide (Pulpdent®) group. There was however a statistical significant difference (greater) between the gray MTA group that had previously been treated with MTAD (group 5) and groups 1-3. There was also a statistical significant difference (greater) between the gray MTA group and the four other groups (1, 2, 3, & 5). Therefore, under the conditions in this study 1.3% sodium hypochlorite and calcium hydroxide paste (Pulpdent®) does not appear to have a weakening affect on dentin. Although MTA by itself displayed the highest resistance to fracture, the combination of MTA and MTAD displayed a favorable resistance to fracture.

LLU Discipline

Pediatric Dentistry

Department

Pediatric Dentistry

School

Graduate School

First Advisor

Leif K. Bakland

Second Advisor

Jay Kim

Third Advisor

John Peterson

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

2004

Date (Title Page)

12-2004

Language

English

Library of Congress/MESH Subject Headings

Dentin; Dentin-Bonding Agents; Mineral Trioxide Aggregate; Calcium Hydroxide

Type

Thesis

Page Count

x; 28

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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