Date of Award
Spring 2014
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Dentistry
First Advisor
Stover,Sheila
Second Advisor
Hashimoto, Lance
Third Advisor
Berzins, David W.
Abstract
Introduction: Root Perforation is an artificial communication between the root canal system and supporting tissue. Various endodontic researchers have published that sealing the perforation immediately has the best prognosis but this predisposes the repair material to come in contact with various root canal irrigants during the course of treatment. The aim of this study was to evaluate the effect of 17% EDTA and 5.25% sodium hypochlorite irrigating solutions on surface hardness of Endosequence Root Repair Material Putty (ERRM).
Method: ERRM, 5.25% Sodium Hypochlorite, 17% EDTA and Deionized water were used. 42 samples were prepared and divided into 2 groups. Each group was divided in three sub groups. Sub Groups in Group I were stored in water, 5.25% NaOCl and 17% EDTA for 7 days and were subjected to hardness testing. After 7 days Group II samples were exposed to water, 5.25% NaOCl, 17% EDTA for 10 minutes and 7 days and were subjected to Vickers microhardness tester for hardness testing. Non-Parametric tests were used due to lack of normalcy of the data.
Results: Exposure of ERRM to water, 17% EDTA, and 5.2% NaOCl during setting over 7 days had no significant effect on the microhardness of ERRM. NaOCl exposed samples were significantly harder than samples exposed to water for 10 minutes and 7 days. Exposure to EDTA resulted in significantly lower microhardness.
Conclusion: 1. Exposure of ERRM to water, 17% EDTA, and 5.2% NaOCl during setting over 7 days had no significant effect on the microhardness of ERRM.
2. Additional exposure to Water or 17% EDTA for 10 minutes reduced the microhardness possibly due to excessive hydration by water resulting in a porous matrix and acidic nature plus calcium depletion by EDTA interfering with the C-S-H gel structure of ERRM.
3. NaOCl (5.25%) increased the microhardness possibly due to non-inhibition of calcium hydroxide formation on the surface and increasing the number and size of the surface crystal.
4. Exposure to extended period of 17% EDTA had detrimental effects on ERRM and samples lacked structural integrity.