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Effect of calcium hydroxide paste dressing on uninstrumented root canal wall
H Wakabayashi1, S Morita, K Koba
1Department of Endodontics, Showa University, School of Dentistry, Tokyo, Japan.
Journal of Endodontics
|November 1, 1995
Summary
Calcium hydroxide paste effectively dissolves the odontoblastic cell layer in root canals. However, it shows minimal impact on the underlying predentin, even after prolonged exposure.
Area of Science:
- Dentistry
- Biomaterials Science
- Microscopy
Background:
- Calcium hydroxide is a common intracanal dressing in endodontics.
- Its effect on soft tissue dissolution on uninstrumented root canal walls requires detailed examination.
Purpose of the Study:
- To investigate the dissolution effect of calcium hydroxide paste on soft tissues, specifically odontoblasts and predentin, on uninstrumented root canal walls.
Main Methods:
- Human extracted teeth were used, with roots split longitudinally.
- Specimens were treated with calcium hydroxide paste for 1 and 4 weeks under controlled conditions.
- Scanning electron microscopy (SEM) was employed to compare root canal walls across groups.
Main Results:
- A distinct layer of odontoblasts was present in the control group but absent in both 1-week and 4-week calcium hydroxide treated groups.
- Predentin remained largely intact after 1 week of treatment.
- Erosion of the predentin surface was observed after 4 weeks of treatment.
Conclusions:
- Calcium hydroxide paste effectively dissolves the odontoblastic cell layer.
- The paste has a limited effect on the underlying predentin, causing some erosion with extended exposure.