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171 Cards in this Set
- Front
- Back
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What is used to describe then natural teeth in the jaw bones?
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dentition
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A child's primary teeth develop during which embryonic period?
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prenatal
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What is the term for tooth development?
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odontogenesis
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After initiation of odontogenesis, what are the identifiable stages of tooth development?
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bud stage, cap stage, bell stage
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What stage of odontogenesis occurs with the formation and maturation of hard dental structures, such as enamel, dentin, and cementum?
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apposition stage
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During the apposition stage, what are the physiological prcesses involved?
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initiation, proliferation, differentiation, morphogenesis, and maturation
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The primary dentition develops during which prenatal periods?
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embryonic and fetal
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Most of the permanent dentition is formed during what prenatal period?
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fetal
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What is the order of stages of tooth development?
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initiation stage
bud stage cap stage bell stage apposition stage maturation stage |
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Odontogenesis of the primary dentition begins between what weeks of prenatal development during what prenatal period?
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sixth and seventh week
embryonic period |
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The first stage of tooth development, known as initiation, invovles the physiological process of what?
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induction
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What is an interaction between the embryological tissues?
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induction
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At the beginning of the 6th week the stomodeum is lined by what?
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ectoderm
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The outer portion of the ectoderm gives rise to what?
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oral epithelium
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Deep to the forming oral epithelium there is a type of mesenchyme orginally from the ectoderm called what?
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ectomesenchyme
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Ectomesenchyme is influenced by what?
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neural crest cells
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What is an important acellular structure that separates the oral epithelium and the ectomesenchyme?
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basement membrane
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During the later portion of the 7th week, the oral epithelium grows deeper into the ectomesenchyme and is induced to produce what?
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dental lamina
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If a mouth has anadontonia, supernumerary teeth, or any other # problem, what development stage can be blamed?
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initiation stage
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If a mouth has macrodontia/microdontia, dens in dente, or any other size problem, what development stage can be blamed?
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cap stage
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What commonly affects the permanent maxillary lateral incisor and the enamel organ invaginates into the dental papilla?
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dens in dente
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What is the name for tooth germ tyring to divide?
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gemination
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What is the name for the union of two adjacent tooth germs?
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fusion
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What stage of tooth development should be blamed if there is gemination, fusion, tubercle, or any other shape problem?
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cap stage
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What is the name for an extra cusp due to effects on enamel organ?
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tubercle
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What tooth development stage should be blamed for an enamel pearl, enamel dysplasia, concrescence or any other ameloblast problem?
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apposition stage
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What is the name for the displacment of ameloblasts to root surface?
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enamel pearl
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What is the name for the faulty development of enamel from interference involving ameloblasts?
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enamel dysplasia
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What is the name for the union of root structure of two or more teeth by cementum?
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concrescence
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What is the name for the absence of single or multiple teeth?
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anodontia
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Partial anadontia occurs more offten with what teeth?
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third molars, mandibular 2nd molars, and maxillary lateral incisors
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What syndrome can anadontia be associated with because many portions of the tooth are indirectly or directly of ectodermal origin?
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ectodermal dysplasia
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What is the abnormal initiation resulting in the development of one or more extra teeth?
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supernumerary teeth
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What is the second stage of odontogenesis?
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bud stage
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All teeth and their associated tissues develop from what?
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ectoderm and ectomesenchyme
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What is the name for abnormally large teeth?
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macrodontia
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What is the name for abnormally small teeth?
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microdontia
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What can complete macrodontia and microdontia be due to?
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disfunction of the pituitary gland
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What is the third stage of odontogenesis?
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cap stage
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What stage of prenatal development does cap stage take place?
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fetal period
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Not only does proliferation characterize the cap stage, but various levels of what are also active during this stage?
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differentiation
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A primordium of the tooth develops during what tooth development stage?
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cap stage
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What teeth are involved in macrodontia?
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3rd molar and maxillary lateral incisors
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What are the different types of differentiation?
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cytodifferentiation, histodifferentiation, and morphodifferentiation
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What is the predominant physiological prodcess during cap stage?
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morphogenesis
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A depression results in the deepest part of each tooth bud of dental lamina and forms a cap called what?
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enamel organ
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During the cap stage the inner mass of ectomesenchyme is now called what?
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dental papilla
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What will produce the future dentin and pulp tissue for the inner portion of the tooth?
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dental papilla
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Dental papilla is originally derived from what?
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ectomesenchyme
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Dentin and pulp are of what origin?
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mesenchymal
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The remaining ectomesenchyme that doesn't evolve into dental papilla will condense into the what?
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dental sac
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The ectomesenchyme surrounding the outside of the cap or enamel organ condenses into what?
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dental sac
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The dental sac is originally derived from what?
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ectomesenchyme
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What are the 3 embryological structures formed after the cap stage?
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enamel organ, dental papilla, and dental sac
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What is the name for the primoridium of the tooth?
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tooth germ
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What 3 structures form the tooth germ?
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enamel organ, dental papilla, and dental sac
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Where does each primordium of the tooth develop in relation to the developing primary tooth?
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lingual
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The site of origin for the primordium of the tooth is called what?
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successional dental lamina
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Permanent teeth formed with primary predecessor are called what?
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succedaneous
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The permanent succedaneous tooth's crown will erupt where in relation to its primary predecessor's roots if the primary tooth has not been shed or lost?
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lingual
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Permanent molars are said to be what since they have no primary predecessor?
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nonsuccedaneous
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What is the 4th stage of tooth develpoment?
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bell stage
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The outer cuboidal cells of the enamel organ are the what?
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outer enamel epithelium
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The innermost tall columnar cells of the enamel organ are what?
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inner enamel epithelium
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Between the outer and inner enamel epithelium are two layers, what are they?
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stellate reticulum and stratum intermedium
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Stellate reticulum and stratum intermedium help do what?
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support the production of enamel
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The dental papilla within the concavity of the enamel organ is also undergoing extensive differentiation and now consists of what two types of layers?
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outer cells of the dental papilla
central cells of the dental papilla |
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In the future, the outer cells of the dental papilla will differentiate into what?
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dentin-secreting cells (odontoblasts)
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In the future, the inner or central cells of the dental papilla will become what?
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primordium of the pulp
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What is the final stage of tooth development?
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apposition and maturation
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After the formation of the IEE in the bell-shaped enamel organ, these innermost cells grow even more columnar and elongate as they differentate into what?
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preameloblasts
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During differentiation of preameloblasts, the nucleus in each cell does what?
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moves away from the center of the cell to the position farthest away from the basement membrane
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When the nucleus moves in the preameloblasts, this cell change is called what?
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repolarization
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In the future, the preameloblasts will do what?
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induce dental papilla to differentiate into cells to secrete enamel matrix
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After the IEE differentiates into preameloblasts, the outer cells of the dental papilla are induced by the preameloblasts to differentiatie into what?
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odontoblasts
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The odotonblasts now begin what, which is the apposition of dentin matrix?
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dentinogenesis
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What is another name for dentin matrix?
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predentin
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When the basement membrane between the preameloblasts and the odontoblasts disintegrates, this allows the preameloblasts to come into contact with what?
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newly formed predentin
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When predentin is newly formed, this indcues the preameloblasts to differentiate into what?
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ameloblasts
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The enamel matrix is secreted from what, which is a tapered portion of each ameloblast that faces the disintegrating basement membrane?
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Tomes' process
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What is the inner junction between the dentin and enamel tissues?
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dentinoenamel junction
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The odontoblasts, unlike the ameloblasts will leave attached cellular extensions in the lengthe of predentin called what?
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odontoblastic process
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Each odontoblastic process is contained in a mineralized cylinder, which is called what?
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dentinal tubule
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What takes place after the crown is completely shaped and the tooth is starting to erupt into the oral cavity?
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process of root development
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What is the structure responsible for root development?
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cervical loop
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What invloves larger number of ameloblasts and may result from traumatic birth, systemic infections, nutritional deficiencies, or dental fluorosis?
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systemic dysplasia
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What results from a reduction in the quantity of enamel matrix?
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enamel hypoplasia
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What results in reduction in the quality of the enamel maturation?
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enamel dysplasia
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What certain type of enamel dysplasia has a hereditory etiology and can affect all teeth of both dentitions?
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amelogenesis imperfecta
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What induces dentin formation in the root area so that it continues with coronal dentin?
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Hertwig's epithelial root sheath (HERS)
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What forms the root?
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HERS or cervical loop
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What accounts for the absence of enamel in the roots?
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HERS failing to differentiate into enamel-forming ameloblasts
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When root dentin is completed, there is a reminices of HERS called what?
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epithelial rests of Malassez
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Groups of cells that remain of HERS are located where?
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PDL
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Odontoblastic process forms what?
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dentinal tubules
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Odontoblasts leave behine what?
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odontoblastic process
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What is the orignal outline of the dentinoenamel junction?
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basement membrane
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What is the apposition of cementum?
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cementogenesis
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The contact of the dental sac cells with the dentin suface induces cells to become what?
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immature cementoblasts
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Cementoblasts undergo cemetogenesis, laying down what?
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cementoid
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As a result of the apposition of cementum over the dentin, what is formed?
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dentinocemental junction
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What is the name for a distorted root that can occur during root development?
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dilaceration
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What teeth are more likely to have dilaceration?
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permanent maxillary lateral incisors
canines |
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What is the name for a extra root in a tooth?
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accessory root
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What teeth are more likely to have accessory roots?
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mandibular canines
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What is the actual vertical movement of the tooth?
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active eruption
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What is occurs as we age, when gingiva recedes, and there is no actual tooth movement?
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passive eruption
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What is the name for the compresses enamel organ?
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reduced enamel epithelium
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What will form the 1st junctional epithelium?
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reduced enamel junction
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What will resorb cementum, dentin, and enamel?
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odontoclasts
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Residue on newly erupted teeth can leave the teeth stained and it consists of fused REE and oral epithelium as well as the dental cuticle placed by the ameloblasts on the new enamel surface, what is this called?
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Nasmyth's membrane
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What is the reminice of the REE?
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Nasmyth's membrane
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Succedaneous permanent teeth erupt lingual to roots of the primary teeth with the exception of what tooth, which move to what position?
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maxillary incsisors
facial |
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What three things do you have to have to make enamel?
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IEE, Stellate reticulum, and stratum intermedium
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Of the 3 things you have to have to make enamel, what supports the formation?
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stellate reticulum and stratum intermedium
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What is a follicular cyst that forms around the crown of a nonerupted impacted tooth?
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dentigerous cyst
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What is the less serious type of dentigerous cyst?
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eruption cyst
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What is enamel formed from?
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enamel organ
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What is dentin formed from?
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dental papilla
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What is cementum formed from?
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dental papilla
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What is alveolar bone formed from?
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mesoderm
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What type of tissue is associated with enamel?
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epithelial
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What type of tissue is associated with dentin?
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connective tissue
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What type of tissue is associated with cementum?
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connective tissue
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What type of tissue is associated with alveolar bone?
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connective tissue
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What cells form enamel?
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ameloblasts
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What cells form dentin?
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odontoblasts
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What cells form cementum?
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cementoblasts
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What cells form alveolar bone?
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osteoblasts
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What incremental lines are associated with enamel?
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lines of Rezius
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What incremental lines are associated with dentin?
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imbrication lines of von Ebner
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What incremental lines are associated with cementum?
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arrest and reverse lines
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What incremental lines are associated with alveolar bone?
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arrest and reverseal lines
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What mature cells are associated with enamel?
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none
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What mature cells are associated with dentin?
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dentinal tubules with processes
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What mature cells are associated with cementum?
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cementocytes
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What mature cells are associated with alveolar bone?
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osteocytes
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What resorptive cells are associated with enamel?
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odontoclasts
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What resorptive cells are associated with dentin?
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odontoclasts
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What resorptive cells are associated with cementum?
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odontoclasts
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What resorptive cells are associated with alveolar bones?
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osteoclasts
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What mineral level is associated with enamel?
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96%
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What mineral level is associated with dentin?
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70%
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What mineral level is associated with cementum?
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65%
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What mineral level is associated with alveolar bone?
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60%
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Is there tissue formation after eruption of enamel?
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none
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Is there tissue formation after eruption of dentin?
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none
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Is there tissue formation after eruption of cementum?
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none
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Is there tissue formation after eruption of alveolar bone?
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present
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Is there vascularity of enamel?
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none
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Is there vascularity of dentin?
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none
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Is there vascularity of cementum?
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none
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Is there vascularity of alverolar bone?
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present
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Is there innervation of enamel?
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none
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Is there innervation of dentin?
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present
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Is there innervation of cementum?
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none
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Is there innervation of alveolar bone?
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present
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What will differentiate into cementum, periodontal ligament, and alvolar bone?
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dental sac
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What serves as protective barrier for enamel organ?
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outer enamel epithelium
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What supports the production of enamel matrix?
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stellate reticulum
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What supports the production of enamel matrix?
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stratum intermedium
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What will differentiate into ameloblasts that form enamel matrix?
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inner enamel epithelium
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What will differentiate into odontoblasts that form dentin matrix?
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outer cells of dental papilla
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What will differentiate into pulp tissue?
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inner (central) cells of dental papilla
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What is the name for where dentin and enamel stop growing?
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arrest line
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What is the name for where dentin and enamel are resorbed back?
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reverse line
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Cementoblasts live where?
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PDL
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Odontoblasts live where?
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pulp chamber
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Why does epithelium stick to things?
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has basement membrane
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What is going to form the teeth?
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dental lamina
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What is the first sign of developing dentition?
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thickening of oral epithelium
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