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What separates primary and secondary ossification centers?
Epiphyseal growth plates (made of hyaline cartilage)
What must first be present for endochondral ossification to occur?
must have hyaline cartilage first
deposition during remodeling, osteoblasts rest and stay in a perfect line. process of bone being laid down
resorption and deposition; osteoclasts resorb to have osteoblasts deposit. rough and jagged
alteration in size, teeth appear small. usually single tooth (max laterals, 3rd molars and supernumerary teeth)
alteration in shape, attempt of single tooth to form 2 teeth. more common in deciduous and occurs when no teeth missing
Dens In Dente / Invaginatus
alteration in shape, invagination of enamel into surface of tooth's crown. a tooth within a tooth
alteration in shape, proliferation of enamel during development. extra enamel in wrong spot, may be on root. usually on max laterals and canines. "enamel pearl"
alteration in shape, crown/body of tooth is enlarged at expense of roots. large pulp chambers, short roots. "bull like" teeth
alteration in number, extra teeth, most often in maxillary. erupt facially on max and lingually on mand
prematurely erupted TRUE deciduous teeth at time of birth, do NOT extract, usually mand centrals
hornified epithelial structure w/ no roots, false teeth, erupt w/ in days of birth, DO extract. exhibit poor anatomy
type of enamel dysplasia; defective formation of enamel matrix, thin enamel. occurs during formative stage
type of enamel dysplasia; hypomineralization, defective mineralization of formed matrix. occurs during calcification stage
type of enamel dysplasia; enamel crystals remain immature. occurs during maturation stage
Environmental Causes of enamel hypoplasia
1. Nutrional deficiency/exanthematous diseases 2. Congenital syphilis 3. Hypocalcemia 4. Birth injuries 5. Local infection or Trauma 6. Ingestion of Chemicals 7. Idiopathic factors (unknown)
Congenital syphilis results in
Hutchinson teeth - teeth w/ notches or mulberry molar -tiny additional cusps
intrinsic color change to dentin undergoing mineralization. yellow to grayish to purple
Hereditary dentinogenesis imperfecta
bluish brown color or yellow, pulp chamber may be missing, enamel is normal but fractures easily due to dentin malformation
etiology unknown, very large pulp chamber, ghost teeth appearance, nonfunctional teeth
due to physical barrier, tooth coming in wrong direction. impacted permanent teeth may become ankylosed
benign tumors, growth of calcified dental tissue (ectodermal and mesodermal - CT and epithelial)
one mass of calcified dental tissue, no definite dental form appearance, more of a mass
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