The Effect of 8.25% Sodium Hypochlorite on Dental Pulp Dissolution and Dentin Flexural Strength and Modulus
Uniformed Services University of the Health Sciences Bethesda United States
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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 n10 were formed consisting of a pulp sample and dentin bar immersed in various NaOCl solutions. The negative control group n5 consisted of pulp samples and dentin bars immersed in saline. The positive control group n5 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.
- Medicine and Medical Research