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Related Experiment Videos

Quantification of root surface plaque using a new 3-D laser scanning method.

S Yeganeh1, E Lynch, V Jovanovski

  • 1Department of Conservative Dentistry, St Bartholomew's and The Royal London School of Medicine and Dentistry, Queen Mary and Westfield College, UK. s.yeganeh@mds.qmw.ac.uk

Journal of Clinical Periodontology
|October 16, 1999
PubMed
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This study objectively measured tooth plaque thickness, finding it greatest near the gum line. Plaque thickness significantly correlated with clinical plaque index scores, supporting theories on root caries initiation.

Area of Science:

  • Dental research
  • Oral hygiene
  • Biomaterials science

Background:

  • Objective quantification of dental plaque thickness is lacking in scientific literature.
  • Plaque accumulation significantly impacts oral health, contributing to conditions like gingivitis and root caries.
  • Existing clinical plaque indices provide subjective assessments of plaque severity.

Purpose of the Study:

  • To objectively quantify dental plaque thickness on tooth surfaces.
  • To determine the correlation between measured plaque thickness and the clinical Silness and Löe plaque index.
  • To investigate plaque distribution relative to the gingival margin and its implications for primary root carious lesions (PRCLs).

Main Methods:

  • Utilized a co-ordinate measuring machine (CMM) and laser scanning probe to analyze dental replicas.

Related Experiment Videos

  • Obtained tooth surface replicas from 51 patients before and after toothbrushing.
  • Assessed plaque thickness at the gingival margin and 250 micrometers from the margin.

    • Main Results:

    • Mean plaque thickness adjacent to the gingival margin was 0.106 ± 0.118 mm.
    • Mean plaque thickness 250 micrometers from the gingival margin was 0.053 ± 0.052 mm.
    • A statistically significant correlation (p ≤ 0.002) was found between plaque index scores and quantified plaque thickness.

    Conclusions:

    • Dental plaque is most abundant adjacent to the gingival margin.
    • The developed method objectively quantifies plaque thickness in vivo, correlating with clinical assessments.
    • Findings support the hypothesis that primary root carious lesions may initiate at the gingival margin.