Odontología

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Developmental Alterations of Teeth II

Amelogenesis Imperfecta
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General Information
• Classification is impractical for clinicians • Problems arise in one or more of the three stages of enamel formation
– Elaboration of enamel matrix;hypoplastic – Mineralization; hypocalcified – Maturation; hypomaturation

General Information
• • • • • • • Absence of systemic disorder Can be part of a syndrome Many types Different modes ofinheritance Understanding of molecular events 1:800 – 1:15,000 (clustering) Both dentitions

Hypoplastic type
• • • • Inadequate deposition of organic matrix Normal mineralization Radiographiccontrast Seven types

1

Hypoplastic type
Generalized Pitted
• • • • • • A.D. Pinpoint/head pits in rows or columns In-between enamel normal Across the surface Buccal surface more severely affectedDoes not correlate with pattern of environmental damage

Hypoplastic type
Generalized Pitted

Hypoplastic type
Generalized Pitted

Hypoplastic type
Generalized Pitted

Hypoplastic typeGeneralized Pitted
• • • • • • •

Hypoplastic type
Localized Pitted
A.D. or A.R. (more severe) Pinpoint/head pits in rows Linear depression or area of hypoplasia Middle third of buccal surface Incisalor occlusal unaffected All teeth or some teeth Primary or both dentitions

2

Hypoplastic type
Localized Pitted
• • • • •

Hypoplastic type
Diffuse Smooth A.D.
Thin, hard, glossy Likecrown preparations, open bite Opaque white to brown X-ray: peripheral thin enamel outline Unerupted exhibit resorption

Hypoplastic type
Diffuse Smooth A.D.

Hypoplastic type
Diffuse Smooth A.D.Hypoplastic type
Diffuse Smooth X-linked dominant
• Males
– Thin, hard, glossy – Like crown preparations, open bite – Opaque white to brown – X-ray: peripheral thin enamel outline

Hypoplastic...
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