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At the same time deep to the forming oral epithelium

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At the same time, deep to the forming oral epithelium, there is a type of mesenchymeoriginally from the ectoderm, theectomesenchymeAbasement membraneseparates the oral epithelium and the ectomesenchyme in thestomodeumDuring the 7thweek, the oral epithelium grows deeper into the ectomesenchyme and isinduced to produce a layer called thedental laminaDevelopmental disturbances:(partial)anodonia, supernumerary teethBud stageSecond stage of tooth developmentOccurs at the beginning of the eighth week of prenatal development for the primarydentition.Physiological process:extensive proliferationBasement membrane remains between the bud and the growing ectomesenchymeDevelopmental disturbances:microdontia, macrodontiaCap stageThird stage of tooth development15
Physiological process:proliferation, differentiation and morphogenesisAprimordiumof the tooth develops with a specific form known as atooth germTooth germ:consists of the enamel organ, dental papilla and dental sacEnamel organ:a depression in the deepest part of each tooth bud of dental lamina andforms a capThis inner mass of ectomesenchyme is now called thedental papillawhich willproduce the futuredentinandpulpA basement membrane still exists between the enamel organ and the dental papillaThe remaining ectomesenchyme surrounding the outside of the cap or enamel organcondenses into thedental sacDental sacwill produce theperiodontium,the supporting tissue types of the tooth:cementum, periodontal ligament, and alveolar boneAt week 10 initiation is occurring for the anterior teeth of thepermanent dentitionEachprimordiumfor these initially formed permanent teeth appears as an extension ofthedental laminainto theectomesenchymelingual to the developing primary toothgerms termed thesuccessional dental lamina. Nonsuccedaneous teeth develop froman extension of the successional dental lamina.Developmental disturbances:dens in dente, gemination, fusion, and tuberclesSuccedaneous vs. NonsuccedaneousSuccedaneousteeth:Permanent teeth formed with primary predecessors include the anteriorteeth and premolars, which replace the primary anterior teeth and molars, respectively. Thepermanent succedaneous tooth's crown will erupt lingual to its primary predecessor's root(s).(succeedaneous teeth will suck out the roots of primary teeth)Nonsuceedaneous teeth:permanent molars have no primary predecessors (Permanent 1st, 2ndand 3rdmolars are nonsuceedaneous). These six permanent molars per dental arch develop froma posterior extension of the dental lamina distal to the general or successional dental lamina.Bell stageFourth stage of tooth developmentoccurs for the primary dentition between theeleventh and twelfth weekof prenataldevelopmentCap shape of the enamel organ evident during the last stage assumes abell shapePhysiological processes: proliferation, differentiation, and morphogenesis-Differentiation occurs on all levels to its fullest extentFour new cells/layers

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Term
Fall
Professor
KARECK MARK
Tags
alveolar bone

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