The underlying aetiologies are multiple, but the categories are mainly twofold: posteruptive
and preeruptive damages.
The inundation maps for the PF (Figure 8) estimated from the LAHARZ program can be compared to the results of the supervised classification created using the posteruptive
Landsat 7 ETM+ image from 30 Jul.
Von Damm, "Chemistry of hydrothermal vent fluids from 9[degrees]-10[degrees]N, East Pacific Rise: "time zero," the immediate posteruptive
period," Journal of Geophysical Research, vol.
Influence of posteruptive
age of enamel on its susceptibility to artificial caries.
The main clinical characteristics of the MIH are: de- marcated opacities, posteruptive
breakdown and atypical restorations.
Furthermore, reports from the CDC and the National Research Council indicate fluoride effect is predominantly posteruptive
(teeth after surfacing) and topical, not systemic.
remobilisation of volcanic ash from its deposits represents another source for volcanic ash in the atmosphere [10-15].
Table 1: Diagnostic Criteria for MIH (Weerheijm 2003) Each tooth should be examined for: 1 Absence or presence of demarcated opacities (defect altering the translucency of the enamel) 2 Posteruptive
enamel breakdown (loss of surface enamel after tooth eruption, usually associated with a pre-existing opacity) 3 Atypical restorations (frequently extended to the buccal or palatal smooth surfaces reflecting the distribution of hypoplastic enamel) 4 Extracted molars due to MIH.
These chemical differences can be attributed to the difference in geographic location in which mussels were living and physical factors arising from posteruptive
Nevertheless, a recent study [Arrow, 2008], using the mDDE criteria, does not separate posteruptive
enamel breakdown from hypoplasia.