口腔科学口腔内科EpidemiologyofCaries龋病病因学；龋齿.pptx

Ep idem iology of Caries
Lin II uancai
G unaghua Schoo lof S tom atobgy
Sun Yat-fen U n iv«ersity

Reliability and
Validity
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Measuring tooth status
-dichotomous 一 present or absent
-ordinal 一 by caries stages or zones
-ratio 一 counting decayed (filled & extracted) teeth

Caries measurement methods
-Visual
-Visual + Tactile inspection
-Radiography (invasive)
-Fiberoptic transillumination
・ Electrical conductance
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LE・ J Can DentAssoc200\ ;67: 459-63.
Fiberoptic transillumination (FOTI)
FOTI is designed for the detection of caries on approximal surfaces. The basis is that decayed tooth material scatters light more strongly, and thus has a lower index of light transmission (darker) than sound tooth structure.
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Angm a—M ansson & ten ***. Adv Dent Res 1993： 71/0-9.
Electrical conductance (EC)
The electrical conductivity of a tooth changes with demineralization, even when the surface remains apparently intact. EC measurements make use of the increased conductivity of carious enamel in pits and fissures
Laser Fluorescence (LF)
The LF method measures the fluorescence of the tooth that is induced after light irradiation to discriminate between carious and sound enamel. It is accepted that the induced fluorescence of enamel is lower in 曽"凤myg icon
Tam LE. J Can Dent Assoc200\ ; 67: 459-63.
Do- D4 scale (ordinal)
・ record caries on a scale that extends
through the full range of disease from the
earliest detectable non-cavitated lesion
through to pulpal involvement
・ good for research studies for it permits

World Healtli Organization. A guide to oral health epidemiologies/
investigations. Geneva: WHO, 1979.
Do ・ D4 scale
Do Surface sound
Di Initial caries
D2 Enamel caries
D3 Caries of dentine