Читать книгу Handbook of Oral Pathology and Oral Medicine - S. R. Prabhu - Страница 54

 Three types of amelogenesis imperfecta have been identified – hypoplastic, hypocalcified and hypomaturation:Hypoplastic type:Enamel is of reduced thickness due to a defect in the formation of normal matrixEnamel is pitted, grooved, stained and thinEnamel is normally mineralized; hard and translucentRadiographically, the enamel contrasts normally from dentineHypocalcified type:Enamel matrix is normal in quantityEnamel calcification is defectiveEnamel is weak in structure and vulnerable to attritionTeeth become opaque, stained and rapidly wear down (Figure 1.6)Radiographically, enamel is less radio‐opaque than dentineHypomaturation type:Enamel is normal in thickness, shows opaque brownish‐yellow patchesEnamel mimics fluorotic mottled enamel in appearanceEnamel is soft and vulnerable to attrition

 Other features that may occur in any of the above types of amelogenesis imperfecta include:Delay in dental eruptionMicrodontiaDeviant crown and morphologyRoot resorptionShort rootsEnlarged pulp chamberPulp stonesDens in dente (dens invaginatus)Tooth agenesisCrowding of teethFigure 1.6 Amelogenesis imperfecta (hypocalcified type); the enamel is stained and vulnerable to attrition(source: by kind permission of Professor Charles Dunlap, Kansas City, USA).