CLINICAL RESEARCH
C
0.23–0.40 mm
0.26–0.30 mm
0.24–0.40 mm
0.3 mm
M 0.80–0.99 mm 0.80–0.92 mm 0.80–0.90 mm 0.9 mm
I
1.00–1.19 mm
0.90–1.02 mm
0.86–1.00 mm 1.0 mm
ENAMEL
+++ IOT
+++
Infinite Optical Thickness
Fig 13
Individual and pooled averages with regards to labial enamel thickness for the maxillary triad at
the cervical (C), middle (M) and incisal (I) thirds. 44-46
tal elongation, 52 while in a homologous manner, hypermineralization of dentin ensues via natural tubular obliteration, rendering dentin more translucent over time. Due to this dynamic cycle of events, juvenile enamel, which is thicker, pos- sesses a texturized surface and is com- posed of small HAp crystals, appearing to be translucent white (higher value) due to more light scattering, while adult (and senior) enamel, which is thinner, is characterized by a polished surface and composed of large HAp crystals, thus
appearing more transparent grey (lower value) due to less light scattering. Further research is desired in order to estimate the dynamic IOT values for enamel and dentin at different stages of tissue maturation, thus establishing uni- versal industry standards for composite resins and etchable ceramics. Possess- ing knowledge of the dynamic IOT and the degree of translucency and opacity of dental resins 53,54 and etchable ce- ramics at given thicknesses will auto- matically enable clinicians and techni- cians to strategize accordingly in order
344 THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY VOLUME 9 • NUMBER 3 • AUTUMN 2014
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