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In vitro surface analysis of active and arrested dentinal caries using a pH-imaging microscope
Yuichi Kitasako1, N Hiraishi, M Nakajima
1Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, Japan. y.kitasako.odnt@dent.tmd.ac.jp
Operative Dentistry
|July 18, 2002
Summary
This study used pH-imaging microscopy to analyze active and arrested dentinal caries lesions. Active lesions showed significantly lower pH values than arrested lesions, indicating distinct acid levels in dental caries.
Area of Science:
- Biomedical Engineering
- Dental Research
- Microscopy
Background:
- Dental caries is a prevalent oral disease characterized by demineralization of tooth structure.
- Understanding the pH environment of active versus arrested caries lesions is crucial for diagnosis and treatment.
- Previous methods for assessing caries activity have limitations in spatial resolution and direct pH measurement.
Purpose of the Study:
- To quantitatively evaluate and compare the pH values of active and arrested dentinal caries lesions in vitro.
- To assess the utility of pH-imaging microscopy for characterizing the micro-environmental pH of dental caries.
- To correlate pH imaging findings with traditional caries detection methods.
Main Methods:
- An in vitro study utilizing pH-imaging microscopy (SCHEM-100) to analyze extracted human teeth with active or arrested dentinal caries.
- Buccal-lingual sections were placed on a pH-imaging sensor for direct pH measurement.
- Statistical analysis using one-way ANOVA and Fisher's PLSD test (p<0.05) compared pH values between lesion types and intact dentin.
- Comparison of pH imaging with a caries detector solution for active and arrested lesions.
Main Results:
- Both active and arrested caries lesions exhibited lower pH values (5.3–6.6) compared to intact dentin (6.8–7.4).
- Significant statistical differences were found between the lowest pH values of active lesions (5.3–5.8) and arrested lesions (6.3–6.6) (p<0.05).
- While arrested lesions were impermeable to dye, pH imaging showed a close correlation with dye staining in active lesions.
Conclusions:
- pH-imaging microscopy effectively differentiates the acidic microenvironments of active and arrested dentinal caries.
- Active caries lesions maintain a significantly lower pH than arrested lesions, reflecting ongoing demineralization.
- This technique offers a valuable tool for in vitro assessment of caries activity and lesion characterization.