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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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1. What are entrapped cementoblasts called?
Tall columnar cells
Connective
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Cementocytes

2. Passive eruption
Odontoblasts
The dental sac
Differentiation - proliferation - morphogenesis
When the gingiva recedes and no actual tooth movement takes place

3. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Induction
Osteoblasts
As a result of the apposition of cementum over dentin

4. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Union of 2 adjacent tooth germs
Abnormally small teeth
Induction

5. What is anodontia?
The dental sac
Osteoblasts
Extra cusp due to effects on enamel organ
Absence of single or multiple teeth

6. What are the developmental disturbances of the cap stage?
Differentiation - proliferation - morphogenesis
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Dens in dente - gemination - tubercle - and fusion
Enamel secreting cells (ameloblasts)

7. What will the outer cells of the dental lamina differentiate into?
The ectomesenchyme
Maturation
Dentin secreting cells (odontoblats)
Proliferation

8. What are the clinical ramifications of gemination?

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9. How is the reduced enamel epithelium created?
Alveolar bone
The enamel organ is compressed
Cementocytes
Initiation

10. The oral epithelium is induced by the ectomesenchyme to produce what?
A bilayer rim that consists only IEE and OEE
Trauma - pressure or metabolic disease
Enamel organ
The dental lamina

11. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Dental papilla
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The bud stage
Epithelial rests of Malassez

12. What is the time span for the bud stage?
8th week
Dental follicle
Initiation stage
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

13. What is cementogenisis?
Into odontoblasts
Initiation
Apposition of the cementum
Dental tissues fully mineralize to their mature levels.

14. What is gemination?
Dentin secreting cells (odontoblats)
The enamel organ - dental papilla - dental sac
Enamel pearl - enamel dysplasia - and concresence
Tooth germ tries to divide

15. What are the clinical ramifications of micro/macrodontia?
Cementocytes
Commonly involves permanent maxillary lateral incisor and 3rd molars
Enamel organ forms into cap - surrounding mass of dental papilla from the ectomesenchyme and surrounded by mass of dental sac also from the ectomesenchyme. Formation of the tooth germ.
Traumatic injury or crowding of teeth

16. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The dental sac
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
There is unequal growth in different parts of the tooth bud

17. What are the clinical ramifications of supernumerary teeth?
A mineralized cylinder - the dentinal tubule
Epithelial
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
8th week

18. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Oral epithelium
Common on permanent molars or cingulum of anterior teeth
Hereditary

19. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
Odontoblastic process
The apposition of the enamel matrix
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

20. What are the incremental lines for enamel?
Union of root structure of two or more teeth by cementum
The apposition of the enamel matrix
Lines of Retzuis
The cervical loop

21. When does the tooth bud become a tooth germ?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Union of root structure of two or more teeth by cementum
In the cap stage
Maturation

22. What are the etiological factors for anodontia?
11th to 12th weeks
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Commonly involves permanent maxillary lateral incisor and 3rd molars
The permanent molars

23. What are the etiological factors for dens in dente and gemination?
Hereditary
The cementum - PDL - and alveolar bone
The dental sac
Dentin secreting cells (odontoblats)

24. What kind of cells occur in the outer enamel epithelium in the bell stage?
Enamel secreting cells (ameloblasts)
Trauma - pressure or metabolic disease
Cuboidal cells
Abnormally small teeth

25. What are the etiological factors of concrescence?
A bilayer rim that consists only IEE and OEE
Traumatic injury or crowding of teeth
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Cementoid

26. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Trauma - pressure or metabolic disease
Epithelial rests of Malassez
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

27. What are the etiological factors for fusion?
The primordium of the pulp
Ectoderm lining stomodeum gives rise to the oral epithelium and then to the dental lamina - adjacent to deeper ectomesenchyme - Which is influenced by the neural crest cells. Both tissues are seperated by a basement membrane
Dental papilla
Pressure on the area

28. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The ameloblasts
Cementoblasts
Dental follicle

29. What hard tissue is innervated by nerves?
Dentin and alveolar bone
A bilayer rim that consists only IEE and OEE
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The tooth germ

30. What is the cap in the cap stage?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The cementum - PDL - and alveolar bone
Dentin secreting cells (odontoblats)
The enamel organ

31. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Initiation
9th to 10th weeks
Abnormally large teeth

32. What is the predominate process of the cap stage?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Enamel
Cementocytes
Morphogenesis

33. What happens when the reduced enamel epithelium is created?
Differentiation - proliferation - morphogenesis
Dental papilla
Inner
The primary tooth can now erupt into the oral cavity - the REE fuses with the oral epithelium - then enzymes from the REE disintegrate the central portion of the epithelial tissue leaving an epithelial tunnel for the tooth to erupt

34. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The stellate reticulum
Common on permanent molars or cingulum of anterior teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Tooth germ

35. What processes are involved in the bell stage?
Enamel secreting cells (ameloblasts)
Differentiation - proliferation - morphogenesis
Preameloblasts
Induction

36. What are the formative cells for alveolar bone?
Osteoblasts
The apposition of the enamel matrix
Absence of single or multiple teeth
Maturation

37. Where is the dental sac originally derived from?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Maturation
The ectomesenchyme
The permanent molars

38. What are the formative cells for dentin?
Odontoblasts
The ectomesenchyme - which was influenced by the neural crest cells
Dental papilla
When the gingiva recedes and no actual tooth movement takes place

39. What is enamel dysplasia?
Tooth germ
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ectomesenchyme - which was influenced by the neural crest cells
Faulty development of enamel from interference involving ameloblasts

40. What type of tissue is dentin - cementum - and alveolar bone?
Traumatic injury or crowding of teeth
9th to 10th weeks
Morphogenesis
Connective

41. What are the mature cells for cementum?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Faulty development of enamel from interference involving ameloblasts
Osteocytes
Cementocytes

42. What is the time span for initiation?
Dental papilla
Dens in dente - gemination - tubercle - and fusion
Tooth germ tries to divide
6th to 7th weeks

43. What is fusion?
Union of 2 adjacent tooth germs
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Dental tissues fully mineralize to their mature levels.

44. What is tubercle?
Extra cusp due to effects on enamel organ
A mineralized cylinder - the dentinal tubule
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Dental follicle

45. Which layer in the bell stage has star shaped cells?
The stellate reticulum
4 types
Alveolar bone
Tooth germ

46. What type of tissue is enamel?
Large single rooted tooth with one pulp cavity and exhibits 'twinning' in crown area. normal number of teeth in dentition. may cause problems in appearance and spacing
Epithelial
Pressure on the area
Enamel secreting cells (ameloblasts)

47. What is the structure responsible for root development?
Traumatic injury or crowding of teeth
The outer enamel epithelium
The cervical loop
The apposition of the enamel matrix

48. What stage does anodontia occur?
During the cap stage
Initiation stage
The apposition of the enamel matrix
The ectomesenchyme

49. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
Alveolar bone
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Large single rooted tooth with one pulp cavity and exhibits 'twinning' in crown area. normal number of teeth in dentition. may cause problems in appearance and spacing

50. What are the etiological factors for micro/macrodontia?
Common on permanent molars or cingulum of anterior teeth
Hereditary in localized form. endocrine dysfunction is complete
A mineralized cylinder - the dentinal tubule
Connective