Congenital defects of dentine development.

Date: 2015-10-07; view: 491.

Incomplete dentinogenesisdevelops as a result of disordered dentine maturation on stage of tissue differentiation: it may involve the predentine matrix, as a result of what there forms amorphous, non-organized and atubular dentine with high content of organic substances. The dentine dysplasia is characterized by the changes of peripulpal dentine and root morphology.

1. Incomplete dentinogenesis (ID)

- the 1^st type – develops at incomplete osteogenesis. Besides the signs of general disorder, we may observe such dental changes: the enamel is watery-grey, of amber color, the teeth are opalescent, they tear off very quickly, root canals obliterate quickly.

- the 2^nd type (syndrome of Stainton-Capdepont) – the teeth look like in the 1^st type, but without signs of incomplete osteogenesis.

- the 3^rd type – it occurs rarely and is described quite especially. The tooth crowns, especially the permanent ones, may look like bell, but there may occur multiple disclosures of dental cavities (in the temporary teeth).

2. Dentine dysplasia (DD)

- the 1^st type ( dysplasia of root dentine) – the crowns are without changes, the roots are immature, with pointed apexes, we observe obliteration of dental cavities or atypical shape of dental cavity – like one or several arch-like cracks, which are situated perpendicularly to the longitudinal dental axis inside the crown or precervical area, it is pseudotaurodontism - extremely large distance from the occlusion surface of the molar crown to its bifurcation at obliterating dental surface, we often meet the foci of dental tissue rarefaction with unexpressed borders around the roots.

- the 2^nd type (dysplasia of crown dentine) – the teeth are of normal color, or they may be brown, the permanent teeth may have extended crown cavities, concrements in the pulp and narrow root canals.