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.
Furthermore, reports from the CDC and the National Research Council indicate fluoride effect is predominantly
posteruptive (teeth after surfacing) and topical, not systemic.
Posteruptive 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 fluid emissions.
Nevertheless, a recent study [Arrow, 2008], using the mDDE criteria, does not separate
posteruptive enamel breakdown from hypoplasia.