Interglobular dentin arises as a consequence of_____________?
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Answer: A. Failure of coalescence of calcospherities
Explanation
Interglobular dentin forms when individual calcospherites fail to fuse completely during mineralization. Unmineralized or hypomineralized zones remain trapped between the spherical masses of dentin matrix. This histological finding is frequently observed in the crown near the mantle dentin layer. Dentin mineralization proceeds through the initial formation and growth of spherical calcospherites. Under normal conditions, these growing spheres expand and coalesce to form a uniformly solid matrix. Vitamin D deficiencies or systemic disturbances can prevent proper coalescence of these calcospherites.
Pathologists note interglobular dentin in conditions like rickets and vitamin D-resistant rickets. Its presence indicates temporary metabolic disruptions during the active formation of tooth dentin. Microscopic analysis of ground sections clearly reveals these irregular unmineralized patches. Physical fractures of dentin occur post-formation and do not represent developmental interglobular spaces. Artifacts in light microscopy are preparation errors rather than true developmental dentin structures. Disturbances in dentinal tubules cause different microscopic anomalies rather than unmineralized globes.
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Answer: A. Gingival
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