NEET MDS Shorts
0
Dental Anatomy
Long-period incremental lines occur approximately every 5 days and are about 20 microns apart. They are equivalent to the striae of Retzius in enamel.
0
Dental Anatomy
Primary dentin consists of mantle dentin (outer 15-20 microns, first formed, with large von Korff fibers and less mineralization) and circumpulpal dentin (the bulk). Atubular dentin is seen in reparative dentin or Tomes' granular layer.
17769
Dental AnatomyAfet tooth eruption in permanent teeth the apex is fully developed after 2-3 years
73875
Dental AnatomyThe most constant and valuable trait to differentiate among maxillary first second and third molars is the depth of central fossae
0
Dental Anatomy
Mantle dentin is the first layer formed by subodontoblastic cells. It contains coarse von Korff fibers (collagen) and is about 4% less mineralized than circumpulpal dentin.
0
Dental Anatomy
Reparative dentin often entraps odontoblast-like cells in lacunae similar to osteocytes. This bone-like, atubular dentin is called osteodentin.
0
Dental Anatomy
As odontoblasts retreat pulpally, they crowd and change direction, producing the primary S-shaped curvature. Secondary curvatures are smaller undulations due to daily variations.
0
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.
0
Dental Anatomy
Peritubular dentin is collagen-free and rich in glycosaminoglycans and phosphoproteins. It is highly mineralized and formed by the odontoblast process itself.
0
Dental Anatomy
Odontoblast cell bodies remain in the pulp periphery; only their processes extend into dentin. Hydroxyapatite makes up about 70% by weight, and collagen type I makes up about 90% of the organic matrix. Incremental lines include lines of von Ebner (daily) and Owen's contour lines (accentuated).