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Witkop and Sauk listed the varieties of AI, divided according to whether the abnormality lay in a reduced amount of enamel (hypoplasia), deficient calcification (hypocalcification), or imperfect maturation of the enamel (hypomaturation), and also recognized the combined defects.
At 3-year follow-up the permanent right and left maxillary central incisors (11 and 21) showed hypocalcification (Figures 3(A), 3(B), and 3(C)), being more severe in tooth (21).
In cases where special optical effects are seen in the tooth such as areas of hypocalcification or areas with high opalescence, special tints or effect materials may be used to mimic the natural tooth.34,41
Few reports have described computed tomography (CT) findings of RO.26,69 These findings indicated that hypocalcification is more severe in enamel than in dentin.
They found 55.37% of the children were affected by enamel defects 23.96% being categorized as hypocalcification and 22.31% as hypoplasia.23 In the present study the frequency of enamel defects were more in maxillary incisors (central incisors) in maxilla (pless than 0.05) whereas the mandibular canine were the most commonly effected tooth in mandibular teeth (pless than 0.05).
The enamel defect in amelogensis imperfecta (AI) generally results in enamel that is too thin (hypoplastic) or too soft (hypocalcification or hypomaturation).
One study has associated enamel hypocalcification of permanent first molars with ankylosed primary molars [Rule et al., 1972].
Tooth discolorations, hypocalcifications, and surface irregularities are important aesthetic concerns [2].
Cheese molars: a pilot study of the aetiology of hypocalcifications in the first permanent molars.
Cheese molars: A pilot study of the etiology of hypocalcifications in first permanent molars.