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Paper Information

Journal:   IRANIAN ENDODONTIC JOURNAL (IEJ)   2012 , Volume 7 , Number 4; Page(s) 189 To 197.
 
Paper: 

A NEW METHOD FOR EVALUATING THE DIFFUSION OF CA2+ AND OH- IONS THROUGH CORONAL DENTIN INTO THE PULP

 
 
Author(s):  GANDOLFI MARIA GIOVANNA*
 
* HEAD LABORATORY OF BIOMATERIALS AND ORAL PATHOLOGY, DEPARTMENT OF ODONTOSTOMATOLOGICAL SCIENCES, UNIVERSITY OF BOLOGNA, VIA SAN VITALE 59, 40125 BOLOGNA, ITALY
 
Abstract: 

Introduction: Ca (OH)2-containing/forming materials are conventionally used for indirect pulp-capping and are theoretically able to release Ca2+ and OH- ions for hydrolytic dissociation. However, no evidence exists for ion diffusion through the remaining coronal dentin. The aim of this study was to design an innovative experimental set-up to test the ability of Ca (OH)2-containing and Ca (OH)2-forming pulp-capping materials to generate pulpward Ca2+and OH- ion fluxes through coronal dentin after indirect pulp-capping in vitro.
Materials and Methods: Standardized class 1 cavities were prepared in erupted sound human molars. Pulp tissue was excised. A coronal Remaining Dentin Thickness (RTD) (1±0.2 mm thick) was prepared within an occlusal-to-pulp cavity system (coronal RD system). The whole system/sample was treated with 17% EDTA to remove the smear layer and the external surface was covered by nail varnish. Indirect pulp-capping was performed on coronal RDT using a conventional pulp-capping material covered by a glass ionomer cement, a composite and nail varnish. Chemically different Ca (OH)2 materials were used to test the reliability of the set-up. The leached Ca2+and OH- ions were measured using ion-selective electrodes after soaking for 3 hours, 24 hours, and 7 days in deionized water (10 mL, 37°C).
Results: Calcium ions were detected and a rise in pH was observed in the treated water after a few hours for all tested materials.
Conclusion: The experimental set-up proved to be an easy and effective method for testing the different Ca (OH)2-containing and Ca (OH)2-forming materials ability to induce a pulpward flux of calcium and hydroxyl ions through coronal remaining dentin after indirect pulp-capping. The new system will allow the screening of current pulp-capping materials.

 
Keyword(s): CALCIUM, CALCIUM HYDROXIDE, DENTIN, DIFFUSION, DYCAL, DENTAL MATERIALS, ENDODONTICS, PULP CAP, PROROOT, MINERAL TRIOXIDE AGGREGATE, PULPDENT PASTE, DENTAL PULP EXPOSURE
 
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