Term
| How many stages are there in Odontogenesis? |
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Definition
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Term
| What is the first stage and when does it occur? |
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Definition
| Initiation, in the 6th and 7th weeks in utero |
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Term
| What happens to the oral epithelium in initiation? Where does this occur first? |
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Definition
| it thickens, this occurs first in the anterior region |
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Term
| What is the name of the oral epithelium as it thickens in initiation? |
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Definition
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Term
| What is the 2nd stage in odontogenesis? |
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Definition
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Term
| When does the bud stage occur? |
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Definition
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Term
| How many buds develop in each arch? |
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Definition
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Term
| What happens to the mesenchyme during the bus stage? |
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Definition
| it is underneath each bud also proliferating |
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Term
| What is the third stage in odontogenesis? |
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Definition
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Term
| When does the cap stage occur? |
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Definition
| the 9th and 10th weeks in utero |
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Term
| What occurs in the cap stage? |
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Definition
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Term
| What all is formed in the cap stage?(3) |
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Definition
1.enamel organ
2.dental papilla
3.dental sac |
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Term
| What is the enamel organ? |
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Definition
| deepest part of each bud that becomes concave |
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Term
| What is the dental papilla? |
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Definition
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Term
| Ectomesenchyme around the ENAMEL ORGAN condenses into the... |
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Definition
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Term
| What forms the dental germ? |
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Definition
| enamel organ+dental papilla+dental sac |
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Term
| What is the fourth stage in odontogenesis? |
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Definition
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Term
| When does the bell stage occur? |
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Definition
| the 11th and 12th weeks in utero |
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Term
| What happens to the dental lamina in the bell stage? |
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Definition
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Term
| What are the 4 shell types seen in the bell phase? |
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Definition
1.IEE
2.OEE
3.Stellate Reticulum
4.Stratum Intermedium |
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Term
| What happens to the dental papilla in the bell stage? |
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Definition
differentiates into two types of cells:
outer and central cells |
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Term
| What are the 5th and 6th stages in odontogenesis? |
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Definition
| Apposition and Maturation Stages |
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Term
| What happens in the Apposition and Maturation Stages? |
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Definition
| Enamel, Dentin, and Cementum are secreted in successive layers |
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Term
| How does this usually occur? |
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Definition
| Initially as a matrix which later calcifies, mineralization occurs over years |
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Term
| What happens in crown formation? |
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Definition
| PREAMELOBLASTS form and This causes the outer cells of Dental Papilla to line up opposite the preameloblasts |
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Term
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Definition
| IEE cells that elongate and become columnar(they differentiate to become preameloblasts) |
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Term
| What do Outer cells in Dental Papilla differentiate into? |
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Definition
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Term
| What happens to the odontoblasts? |
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Definition
| they undergo repolarization and Dentinogenesis |
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Term
| How do odonotoblasts undergo dentinogenesis? |
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Definition
| by secreting dentin matrix |
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Term
| What happens once dentin matrix is secreted? What is this process called? |
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Definition
| Basement membrane separating Preameloblasts and Odontoblasts disintegrate, called Amelogenesis |
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Term
| What do Preameloblasts differentiate into? |
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Definition
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Term
| What do ameloblasts secrete? |
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Definition
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Term
| Why is the Enamel matrix is in contact with dentin matrix? |
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Definition
| because of disintegration of the basement membrane |
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Term
| What does this mineralize to become? |
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Definition
| The dentinoenamel junction |
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Term
| When does root development take place? |
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Definition
| After crown development is complete |
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Term
| What is the structure responsible for root development? |
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Definition
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Term
| What are the cells located at the cervical loop called? |
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Definition
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Term
| What happens to the Hertwig’s Root Sheath? |
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Definition
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Term
| What do Mesenchymal cells in Dental Sac become? |
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Definition
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Term
| What are remenants of Hertwig’s Root Sheath called? |
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Definition
| Epithelial Rests of Malassez |
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Term
| What do cementoblasts secrete? |
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Definition
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Term
| What are cementoblasts that become trapped in cememtoid called? |
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Definition
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Term
| What is mesenchyme in Dental Sac also forming? |
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Definition
| collagen fibers that will become the PDL |
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Term
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Definition
| central cells of the dental papilla |
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Term
| When mesenchyme cells from the dental sac begin to mineralize what do they form? |
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Definition
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Term
| What happpens to the root trunk of posterior teeth? |
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Definition
| divide into number of branches for it's type |
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Term
| How do epithelial extensions develop? |
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Definition
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Term
| What happens when Horizontal epithelial extensions develop? |
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Definition
| it divides the root into 2 or 3 branches |
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Term
| When can disturbances during development occur? |
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Definition
| anytime- initiation, bud stage, cap stage, apposition, root formation, cementum formation |
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Term
| What disturbances can occur during initiation? (3) |
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Definition
1.hypodontia- missing tooth
2.anodontia- no teeth
3.supernumerary teeth-extra teeth |
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Term
| What disturbances can occur during the bud stage? (2) |
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Definition
1.macrodontia- enlarged tooth
2.microdontia- small tooth |
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Term
| Which disturbances can occur during the cap stage? (4) |
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Definition
1.Dens-in-dente: tooth inside of a tooth
2.gemination-tooth that tried to make two teeth
3.fusion-two crowns fused together
4.tubercles- like cusp of carabelli but not supposed to be there |
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Term
| What disturbances can occur during apposition? (3) |
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Definition
1.enamel dysplasia- caused by too much fluoride
2.hypoplasia- white, yellow, brown spots on teeth
3.(same as hypoplasia) hypocalsification-excess calcium, white spots |
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Term
| What disturbances can occur during root formation? (3) |
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Definition
1.Enamel pearls- clump of enamel on root
2.dilaceration- sharp curvature of the root
3.accessory roots- extra roots |
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Term
| What disturbances can occur during cementum formation? (1) |
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Definition
| concrescence- excess cementum |
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Term
| Which portion of the primary tooth will have damage if something occurs 4-5 months in utero? |
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Definition
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Term
| Which portion of the primary tooth will have damage if something occurs 6-7 months in utero? |
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Definition
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Term
| Which portion of the primary tooth will have damage if something occurs 8-9 months in utero? |
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Definition
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Term
| Which portion of the permanent tooth will have damage if something occurs when someone is in their 1st year of life? |
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Definition
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Term
| Which portion of the permanent tooth will have damage if something occurs when someone is in their 2nd year of life? |
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Definition
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Term
| Which portion of the permanent tooth will have damage if something occurs when someone is in their 3rd year of life? |
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Definition
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Term
| During tooth eruption what do Ameloblasts secrete? (that LAST thing secreted by ameloblasts) |
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Definition
| an acellular dental cuticle on enamel |
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Term
| What is formed after the completion of enamel? |
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Definition
| the reduced enamel epithelium (REE) |
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Term
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Definition
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Term
| What is this area of fusion called? |
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Definition
| the initial junctional epithelium |
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Term
| How do succedaneous permanent tooth develop compared to deciduous tooth? |
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Definition
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Term
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Definition
| absorb bone between the primary and permanent teeth |
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Term
| What do odontoclasts do to the deciduous root? |
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Definition
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Term
| What replace the tissue reabsorbed by the osteoclasts and odontoclasts? (3) |
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Definition
1.Odontoblasts
2.Osteoblasts
3.Cememtoblasts |
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Term
| What is extopic eruption? |
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Definition
| primary and permanent teeth erupt at the same time |
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