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Relationship between laser fluorescence and enamel hypomineralisation.

R A Farah¹, B K Drummond, M V Swain

¹Department of Oral Sciences, Faculty of Dentistry, University of Otago, New Zealand. farra304@student.otago.ac.nz

Journal of Dentistry

|September 13, 2008

Summary

Increased laser fluorescence (LF) readings in hypomineralised enamel, without caries, may indicate enamel defects. This suggests DIAGNOdent can help detect hypomineralisation by correlating with reduced hardness and elastic modulus.

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Area of Science:

Dental Science
Biomaterials Science
Nanotechnology

Background:

Molar-incisor hypomineralisation (MIH) is a common enamel defect.
The mechanical properties of hypomineralised enamel are not well understood.
Laser fluorescence (LF) is a diagnostic tool used in dentistry.

Purpose of the Study:

To investigate the relationship between the mechanical properties of hypomineralised enamel and its laser fluorescence (LF).
To determine if LF can be used as a non-invasive indicator of enamel hypomineralisation.

Main Methods:

Five extracted teeth with MIH defects were analyzed.
Nanoindentation was used to measure enamel hardness (H) and elastic modulus (E).
Laser fluorescence (LF) readings were taken using a DIAGNOdent pen at the same sites.

Main Results:

Enamel hardness and elastic modulus showed a significant, moderately strong inverse correlation with LF readings (p<0.001).
Cervical enamel readings were within the normal range for sound enamel.
LF readings increased as enamel hardness and elastic modulus decreased.

Conclusions:

Elevated DIAGNOdent readings can indicate enamel hypomineralisation in the absence of caries.
Increased LF in hypomineralised enamel may be due to proteins or light scattering.
LF shows potential as a diagnostic indicator for enamel hypomineralisation.