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Effects of sodium hypochlorite solution on root dentine composition.
C O Driscoll1, S E P Dowker, P Anderson
1Eastman Dental Institute for Oral Health Care Sciences, University College London, London WC1X 8LD, UK.
Journal of Materials Science. Materials in Medicine
|September 7, 2004
Summary
Sodium hypochlorite (NaOCl) solution, widely used in root canal treatment, primarily affects dentine's organic phase, not its mineral content. NaCl retention in dentine after NaOCl irrigation warrants further study for endodontic sealants.
Area of Science:
- Biomaterials Science
- Dental Materials Science
- Chemistry
Background:
- Sodium hypochlorite (NaOCl) is a common irrigant in root canal therapy.
- Understanding NaOCl's effects on dentine composition is crucial for clinical success.
Purpose of the Study:
- To investigate the impact of varying concentrations of NaOCl solutions on root dentine composition.
- To assess the effects on both the organic and mineral phases of dentine.
Main Methods:
- Dentine powder and bulk specimens were treated with 0.5%, 3%, and 5% NaOCl solutions.
- Techniques included infrared spectroscopy, X-ray powder diffraction, and scanning microradiography (SMR).
Main Results:
- Infrared spectroscopy confirmed depletion of the organic phase in dentine powder.
- X-ray diffraction detected NaCl, but apatite lattice parameters remained unchanged.
- SMR demonstrated no mineral loss from bulk dentine or hydroxyapatite after prolonged NaOCl exposure.
Conclusions:
- NaOCl primarily affects the organic matrix of dentine, with minimal impact on the mineral phase.
- The mineral phase stability suggests NaOCl's reaction with apatite is not a primary cause of mechanical property changes.
- Further research is needed on the effects of retained NaCl on endodontic sealants.