الفهرس 
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Abstract
This study was designed to find whether CHD affects the structures and/or chemical composition of enamel and dentin of deciduous teeth. Sixty exfoliatedhuman deciduous teeth were selected for this study; they were free of caries and any other visible defects. The teeth were divided into the following groups: Group I (control): Subgroup IA: Incisors (n=6), Subgroup IB: Molars (n=6). Group II: acyanotic CHD children, Subgroup IIA: (n=12), Subgroup IIB: (n=12). Group III: cyanotic CHD children, Subgroup IIIA: (n=12), Subgroup IIIB: (n=12). Based on the results we conclude that, Acyanotic and cyanotic CHD affect the structure of enamel and dentin of deciduous teeth. This appeared on microscopic and ultrastructural levels. CHD affects the mineral content of both enamel and dentin of deciduous teeth, rendering the dentition at increased risk of dental caries.