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Plaque fluid and diffusion: study of the cariogenic challenge by computer modeling.
1Medical Research Council Dental Group, Dental School, Bristol, England.
Journal of Dental Research
|June 1, 1990
Summary
This study models dental caries using a computer simulation, revealing how factors like sugar, plaque buffering, and saliva exchange impact tooth decay. The model highlights the crucial role of buffering in preventing low pH levels during cariogenic challenges.
Area of Science:
- Biochemistry
- Computational Biology
- Dental Science
Background:
- Dental caries is a complex process involving transport and reaction kinetics.
- Understanding these processes requires sophisticated numerical methods.
Purpose of the Study:
- To develop and analyze a one-dimensional finite-difference computer model of the cariogenic process.
- To investigate the influence of various factors on the progression of dental caries.
Main Methods:
- A finite-difference computer model simulating sugar clearance, salivary exchange, and intra-plaque events.
- Incorporation of diffusion, pH-dependent acid production, buffer equilibria (acetate, lactate, phosphate), ion transport (K+, Cl-, H+), and charge-coupling (Q-couple algorithm).
- Modeling of mineral dissolution/precipitation and comparison with a simpler model lacking fixed buffers.
Main Results:
- Fixed buffers significantly extend the low pH range of a Stephan curve.
- The isoelectric point of plaque bacteria and mobile buffer concentrations (e.g., acetate) influence the cariogenic challenge.
- Plaque/saliva contact dynamics profoundly affect the modeled cariogenic challenge.
Conclusions:
- The developed model provides insights into the multifactorial nature of dental caries.
- Buffering capacity and plaque-saliva interactions are critical determinants of caries risk.
- The model can be used to explore interventions and understand caries progression better.