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In vitro evaluation of pH changes induced by calcium hydroxide liners
Koray Gençay1, Figen Seymen, Senem Selvi
1Department of Pedodontics, Faculty of Dentistry, Istanbul University, Istanbul, Turkey.
Quintessence International (Berlin, Germany : 1985)
|July 21, 2004
Summary
Five calcium hydroxide liners were tested for pH changes over time. All liners increased the pH of deionized water, indicating their alkaline nature is maintained.
Area of Science:
- Dental materials science
- Biomaterials research
- Calcium hydroxide applications
Background:
- The alkaline pH of calcium hydroxide is crucial for its biological activity.
- Variations in pH from different calcium hydroxide liners are a significant clinical concern.
Purpose of the Study:
- To assess the pH changes induced by five distinct calcium hydroxide liners.
- To evaluate pH variations at multiple time points after material application.
Main Methods:
- Five calcium hydroxide liners (Dycal, Life, Calic, Dycal VLC, Calcident 450) were tested.
- Samples were immersed in deionized water (pH 7.0) at room temperature.
- pH measurements were recorded at 1 hour, 24 hours, 3 days, and 7 days.
Main Results:
- Significant differences in mean pH values were observed among all tested materials and time intervals.
- Dycal VLC showed the highest pH at 1 hour.
- Calcident 450 exhibited the highest pH values at 24 hours, 3 days, and 7 days.
Conclusions:
- All evaluated calcium hydroxide liners effectively increased the pH of deionized water towards an alkaline range.
- The alkaline nature of these dental materials is sustained over a 7-day period.