Accession Number : AD1036677

Title :   The Effect of 8.25% Sodium Hypochlorite on Dental Pulp Dissolution and Dentin Flexural Strength and Modulus

Descriptive Note : Technical Report

Corporate Author : Uniformed Services University of the Health Sciences Bethesda United States

Personal Author(s) : Cullen,James K

Full Text :

Report Date : 18 Jun 2015

Pagination or Media Count : 22

Abstract : The purpose of this study was to evaluate the effect of various concentrations of sodium hypochlorite (NaOCl), including 8.25%, on dental pulp dissolution and dentin flexural strength and modulus. Methods: 60 dental pulp samples and 55 plane-parallel dentin bars were retrieved from extracted human teeth. Five test groups (n=10) were formed consisting of a pulp sample and dentin bar immersed in various NaOCl solutions. The negative control group (n=5) consisted of pulp samples and dentin bars immersed in saline. The positive control group (n=5) consisted of pulp samples immersed in 8.25% NaOCl without a dentin bar. Every six minutes for one hour, the solutions were refreshed. The dentin bars were tested for flexural strength and modulus with a three-point bend test. The time until total pulp dissolution and any changes indent in bar flexural strength and modulus for the different NaOCl solutions were statistically analyzed. Results: An increase in NaOCl concentration showed a highly significant decrease in pulp dissolution time. The pulp dissolution property of 8.25% NaOCl was significantly faster than any other tested concentration of NaOCl. The presence of dentin did not have a significant effect on the dissolution capacity of NaOCl if the solutions were refreshed. NaOCl concentration did not have a statistically significant effect on dentin flexural strength or modulus.

Descriptors :   teeth , flexural strength , therapeutics , periodontics , tooth diseases , theses

Subject Categories : Medicine and Medical Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE