Related Experiment Videos
In vitro diffusion of hydroxyl ions through root dentine from various calcium hydroxide medicaments
S Sevimay1, A Kalayci, S Yilmaz
1Department of Endodontics, Faculty of Dentistry, University of Ankara, Ankara, Turkey. ssevimay@dentistry.ankara.edu.tr
Journal of Oral Rehabilitation
|September 17, 2003
Summary
Non-setting calcium hydroxide [Ca(OH)2] medicaments effectively release hydroxyl ions through dentine. Ca(OH)2-distilled water mixture and TempCanal demonstrated superior sustained alkalinity compared to Ca(OH)2 plus point.
Area of Science:
- Endodontics
- Dental Materials Science
- Biomineralization
Background:
- Calcium hydroxide [Ca(OH)2] is a widely used intracanal medicament in endodontics.
- Its efficacy is attributed to the release of hydroxyl ions, which create an alkaline environment.
- Understanding the diffusion and sustained release of hydroxyl ions from various Ca(OH)2 formulations through dentine is crucial for optimizing treatment outcomes.
Purpose of the Study:
- To investigate and compare the diffusion of hydroxyl ions from different calcium hydroxide [Ca(OH)2] based medicaments through dentine.
- To evaluate the sustained alkalinity provided by various Ca(OH)2 formulations over time.
Main Methods:
- Forty-five single-rooted teeth were prepared with standardized cavities and smear layer removed using 17% EDTA.
- Roots were coated, leaving cavities exposed, and randomly assigned to four experimental groups (Ca(OH)2-distilled water, TempCanal, Calasept, Ca(OH)2 plus point) and a control group.
- pH measurements were taken at multiple time points up to 14 days in distilled water at 37°C.
Main Results:
- Ca(OH)2-distilled water mixture and TempCanal exhibited the highest pH values at 24 hours and maintained higher pH levels compared to Ca(OH)2 plus point after 24 hours (P<0.05).
- Calasept, Ca(OH)2 plus point, and the control group showed peak pH values at 3 hours.
- The pH values of Ca(OH)2 plus point were consistently lower than other tested materials after 3 hours.
Conclusions:
- Non-setting calcium hydroxide [Ca(OH)2] based materials, specifically the Ca(OH)2-distilled water mixture and TempCanal, demonstrate effective and sustained release of hydroxyl ions through dentine.
- These findings suggest that the formulation significantly impacts the long-term alkalinity of intracanal medicaments.
- Ca(OH)2 plus point exhibited a less effective and sustained hydroxyl ion release compared to other tested materials.