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Related Experiment Videos

Human experimental caries models: intra-oral environmental variability

O Fejerskov1, B Nyvad, M J Larsen

  • 1Department of Dental Pathology, Operative Dentistry and Endodontics, Royal Dental College, Faculty of Health Sciences, Aarhus University, Denmark.

Advances in Dental Research
|July 1, 1994
PubMed
Summary

In situ caries models show significant biological variation within the oral cavity. Differences in salivary factors and microflora mean results from various in situ models are not directly comparable.

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Area of Science:

  • Dental Research
  • Caries Modeling
  • Oral Microbiology

Background:

  • In situ caries models offer an alternative to clinical trials for data acquisition.
  • Intra-oral location-specific variations in these models have been largely overlooked.
  • Understanding these variations is crucial for interpreting study outcomes.

Purpose of the Study:

  • To characterize diverse in situ caries model designs.
  • To identify key intra-oral factors influencing model outcomes.
  • To compare in vivo and in situ model advantages and disadvantages.

Main Methods:

  • Review of existing literature on in situ caries models.
  • Categorization of models into dental appliance and single-tooth types.
  • Analysis of factors like salivary properties, microflora, and environmental protection.

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Main Results:

  • In situ models exhibit distinct biological potentials.
  • Regional oral cavity variations (saliva flow, pH, microflora) impact comparability.
  • Local factors (plaque thickness, specimen protection) further influence results.

Conclusions:

  • No single in situ model can universally replace clinical trials due to intra-oral variability.
  • In situ models are valuable for estimating anticaries agents' relative effects.
  • Model selection must align with specific study objectives and aims.