NEET MDS Shorts
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Dental Anatomy
Sclerotic dentin is a vital defense mechanism. Peritubular dentin thickens and occludes the tubule to reduce permeability and slow caries progression.
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Dental Anatomy
When an odontoblast dies (due to caries or attrition), its process degenerates, leaving an empty dead tract. These are overlaid by reparative dentin on the pulpal side. Dead tracts are more permeable to irritants unless sealed by sclerotic dentin.
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Dental Anatomy
Peritubular dentin is hypermineralized (about 40% more than intertubular), lacks collagen, is rich in proteoglycans, and forms the wall of the tubule. It is also called intratubular dentin and is best seen in ground sections or SEM, as it dissolves in decalcified sections.
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Dental Anatomy
Empty tubules contain air and less mineral, so they appear more radiolucent. Sclerotic dentin appears radiopaque.
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Dental AnatomyThe first teeth to erupt in the dental arches of the human being are the, primary mandibular central incisors
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Dental Anatomylateral incisor is most often missing congenitally
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Dental Anatomy
Tomes' granular layer is a dark granular zone in root dentin just below cementum. It appears granular under light microscopy due to branching and looping of terminal dentinal tubules, which cause air entrapment. It is not present in the crown.
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Dental Anatomy
Vitamin D deficiency leads to hypomineralization due to a low calcium-phosphate product. Globular mineralization fails, increasing interglobular dentin.
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Dental Anatomy9 months of age, is the usual eruption time for primary lower lateral incis
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Dental Anatomy
Ground sections are prepared by cutting and grinding the tooth thin without decalcification. All soft tissues are destroyed, including pulp, odontoblast cell bodies, and the organic part of predentin. Only hard tissue remains, such as enamel prisms, dentinal tubules as empty channels, interglobular spaces, and incremental lines.