On a microscopic scale, these lesions exhibit disorganised enamel prisms
, separated with gaps containing a protein-rich matrix [1, 12-14].
Referring to Fagrell in 2011, enamel in teeth af- fected by MIH exhibits disorganized enamel prisms
, a porous structure and loosely packed crystallites.
The reason for the darkening of teeth is reduced enamel thickness which occurs because of wear, trauma and other factors, as a consequence the colour of dentine beneath is reflected on the surface.3 Boyde defined the structure of dental enamel and expounded that crystals are organised within enamel prisms
that run from the dentino-enamel junction (DEJ) to the tooth surface.4
Furthermore, the phosphoric acid protocol produced an aggressive enamel etching pattern of the treated surface, with completely exposed enamel prisms
This technique has claimed to improve fragment retention since enamel beveling alters the enamel prisms
orientation, allowing for achievement of a more effective acid etching pattern.
Directions and interrelationships of enamel prisms
from the sides of human teeth.
This finding can be explained by the fact that laser irradiation destroys enamel prisms
in an indifferent way: the core of the prism as well as the walls is destroyed (Class 3 in the Silverstone classification), resulting in the typical lava flow appearance of the enamel surface under SEM [20, 21].
(11) The side effects of peroxides on enamel include increased enamel porosity, pitting, erosion, demineralization of the periphery of enamel prisms
and mineral loss promoted by the decrease in the inorganic content.
The association of high fever with enamel hypomineralisation during infancy has recently been explained by an experimental study showing that persistent high fever influenced the process of enamel formation, producing disorientation of enamel prisms
and crystal-free areas [Tunk et al., 2006].
Since it was possible to remove a piece of the diseased tissue for histopathological examination, we observed thin areas of hypocalcified enamel with irregularly arranged enamel prisms
(CHO, 2006; NICODEMO et al., 1990; REZENDE et al., 1998; VOLPATO et al., 2008).