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Dev & Eruption
Dental Embryology DENT-125
| Question | Answer |
|---|---|
| Odontogenisis | process of tooth development begins between the 6th and 7th week |
| dentition | natural teeth in the jaws |
| primary dentition | develop during prenatal period, 20 teeth. |
| permanent dentition | 32 adult teeth |
| initiation stage | involves the process of induction, active interaction between embryologic tissue types |
| Oral epithelium | initially 2 horseshoe shaped arches lining the stomodeum |
| Ectomesencyme | deep to oral epithelium, derived from neural crest cells |
| Dental lamina | forms in the midline for both arches and grows posteriorly |
| Dental placodes | form within dental lamina, first signaling centers of the tooth |
| Andontia | absence of tooth or teeth, commonly permanent third molar, max lateral incisor and mandibular second premolar |
| Supernumerary tooth | initiated from persisting dental placodes. Often between max central incisors, distal to max 3rd molars, premolar region of both arches. |
| bud stage | extensive proliferation of dental placodes into buds, with 3D oval masses penetrating into ectomesenchyme. Only proliferation during this stage |
| cap stage | Primary process is morphogenesis. Proliferation and differentiation to form the tooth germ. Unequal growth in different parts of the bud lead to a 3d cap shape that will define the future tooth |
| Enamel organ | derived from ectoderm, will produce the enamel on the outer surface of the tooth |
| dental papilla | will produce the future dentin and pulp for the inner part of the tooth |
| dental sac | will produce the periodontium, is originally derived from mesenchyme |
| tooth germ | primordium of the tooth, including the enamel organ, dental papilla, and dental sac. |
| Sucessional dental lamina | site of origin for succedaneous permanent teeth |
| bell stage | differentiation on all levels occur to it's furthest extent, and 4 different types of cells are now found within the enamel organ |
| outer enamel epithelium | cuboidal cells that serve as a protective border and nutritional supply for the rest of the enamel organ |
| inner enamel epithelium | will differentiate by stages into enamel secreting ameloblasts . tall columnar cells |
| Stellate reticulum | network of star shaped cells maintaining intercellular fluid used for nutrition, shrinks as space is used to form enamel, communicate via desmosomes |
| stratum intermedium | maintain high alkaline phosphate enzyme activity important for enamel mineralization, |
| Odontoblasts | dentin secreting cells derived from outer cells of dental papilla |
| Central cells of the dental papilla | primordium of the pulp. |
| apposition stage | enamel, dentin and cementum are secreted in successive layers. Stage is defined by reciprocal induction between the ectodermal tissue of the enamel organ and the mesenchymal tissue of the dental papilla and dental sac. |
| basement membrane | acts as a barrier, but also conveys communication between cell layers. |
| enamel displasia | faulty development of enamel |
| enamel hypoplasia | reduction in *quantity* of enamel matrix. pitting. |
| enamel hypocalcification | reduction in the *quality* of enamel maturation. intrinsic staining of enamel |
| turner spot | dark spot due to hypocalcification. referred to as a Turner tooth |
| ameliogenisis imperfecta | very thin enamel that flakes off or no enamel at all. |
| dentin dysplasia | faulty development of the dentin |
| dentinogenisis imperfecta | blue-gray or brown teeth with rainbowlike opalescent sheen. type I is associated with osteogenisis imperfecta. (brittle bone disease) |
Created by:
SonyaP
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