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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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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Tooth germ
Preameloblasts
The ectomesenchyme
Odontoclasts

2. What is dens in dente?
Differentiation
Proliferation
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Enamel organ invaginates into the dental papilla

3. Where is the dental sac originally derived from?
Odontoblastic process
8th week
The ectomesenchyme
Abnormally large teeth

4. Which teeth are nonsuccedaneous?
There is unequal growth in different parts of the tooth bud
Enamel organ
Apposition of the cementum
The permanent molars

5. What processes are involved in the bell stage?
The enamel - dentin - and cementum are secreted in successive layers
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.
Differentiation - proliferation - morphogenesis
The enamel organ - dental papilla - dental sac

6. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Union of root structure of two or more teeth by cementum
Tooth germ
Initiation stage
Initiation

7. What are the major components of the tooth germ?
Dentin secreting cells (odontoblats)
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The enamel organ - dental papilla - dental sac
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

8. What are the cell layers found in the enamel organ in the bell stage?
The cementum - PDL - and alveolar bone
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dental papilla
Differentiation

9. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Cuboidal cells
The ameloblasts place an acellular dental cuticle on the new enamel surface
The ectomesenchyme - which was influenced by the neural crest cells

10. What are the mature cells for alveolar bone?
9th to 10th weeks
Tall columnar cells
Union of root structure of two or more teeth by cementum
Osteocytes

11. What wll the inner enamel epithelium differentiate into?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dens in dente - gemination - tubercle - and fusion
Enamel secreting cells (ameloblasts)
Maturation

12. What are the developmental disturbances of the cap stage?
The cervical loop
Dens in dente - gemination - tubercle - and fusion
Commonly involves permanent maxillary lateral incisor and 3rd molars
Initiation

13. What happens during the bud stage?
The permanent molars
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Enamel
Differentiation - proliferation - morphogenesis

14. What will the inner cells of the dental lamina differentiates into?
There are none - they are lost with eruption
The primordium of the pulp
The cervical loop
Hereditary

15. What is the time span for initiation?
Osteoblasts
6th to 7th weeks
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
The dental sac

16. What happens during the cap stage?
Cementocytes
Cementoblasts
Induction
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.

17. What is anodontia?
Absence of single or multiple teeth
Maturation
Bud stage
The apposition of the enamel matrix

18. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Common on permanent molars or cingulum of anterior teeth
Dental tissues secreted as matrix in successive layers.
Initiation stage
It disintegrates as the developing oral mucosa comes to line the oral cavity

19. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Trauma - pressure or metabolic disease
Maturation
Hereditary

20. What happens during initiation?
Extra cusp due to effects on enamel organ
Cementoblasts
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
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

21. When does the tooth bud become a tooth germ?
Epithelial rests of Malassez
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
In the cap stage
Differentiation

22. What stage does anodontia occur?
The ectoderm
The basement membrane
The ameloblasts place an acellular dental cuticle on the new enamel surface
Initiation stage

23. What does the cervical loop consist of?
Preameloblasts
A bilayer rim that consists only IEE and OEE
Enamel organ invaginates into the dental papilla
The primordium of the pulp

24. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
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
The ameloblasts place an acellular dental cuticle on the new enamel surface
The basement membrane
Initiation

25. What is the outer portion of the ectoderm in the initiation stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Odontoclasts
Oral epithelium
The bud stage

26. What are the clinical ramifications of enamel pearl?
Preameloblasts
Dental papilla
Cementoblasts
May be confused as calculus deposit on root

27. What happens during the apposition stage?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Dental tissues secreted as matrix in successive layers.
Hereditary
Dens in dente - gemination - tubercle - and fusion

28. What is cementogenisis?
Hereditary
Apposition of the cementum
The outer cells of the dental papilla and the central cells of the dental papilla
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

29. What are the development disturbances of the apposition and maturation stages?
Faulty development of enamel from interference involving ameloblasts
There is unequal growth in different parts of the tooth bud
Enamel pearl - enamel dysplasia - and concresence
Dens in dente - gemination - tubercle - and fusion

30. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
Odontoblastic process
8th week
Hereditary in localized form. endocrine dysfunction is complete

31. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Common on permanent molars or cingulum of anterior teeth
9th to 10th weeks
Abnormally large teeth

32. What hard tissue is innervated by nerves?
The dental sac
Abnormally large teeth
Osteoblasts
Dentin and alveolar bone

33. What happens during the appositional stage?
The enamel organ - dental papilla - dental sac
Initiation
The enamel - dentin - and cementum are secreted in successive layers
Dental papilla

34. What is the process involved in the maturation stage?
The bud stage
The outer enamel epithelium
4 types
Maturation

35. What is another name for the dental sac?
The outer cells of the dental papilla and the central cells of the dental papilla
The basement membrane
Dental follicle
Differentiation - proliferation - morphogenesis

36. What are the etiological factors for anodontia?
The dental lamina
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The enamel organ

37. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Dental papilla
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
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.

38. What are succedaneous teeth?
Bud stage
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.
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Compressed layer of flat to cuboidal cells

39. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Inner
Induction
The ameloblasts

40. What are the clinical ramifications of dens in dente?
Trauma - pressure or metabolic disease
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Connective

41. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Tooth germ tries to divide
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
The bud stage
Commonly involves permanent maxillary lateral incisor and 3rd molars

42. Where is the enamel matrix secreted from by the ameloblasts?

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43. What are the etiological factors of tubercle?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Proliferation - differentiation - morphogenesis
Preameloblasts
Trauma - pressure or metabolic disease

44. What are the mature cells for dentin?
Union of root structure of two or more teeth by cementum
The outer enamel epithelium
Maturation
Only dentinal tubules with processes

45. How is the dentinocemental junction formed?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Lines of Retzuis
As a result of the apposition of cementum over dentin
The primordium of the pulp

46. What are the formative cells for dentin?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Odontoblasts
Absence of single or multiple teeth
Common with permanent maxillary molars

47. What is the predominate process in the bell stage?
Initiation
Odontoclasts
Connective
Differentiation

48. The oral epithelium is induced by the ectomesenchyme to produce what?
Cementocytes
Displacement of ameloblasts to root surface
The dental lamina
The enamel organ

49. What type of tissue is enamel?
8th week
Epithelial
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Odontoclasts

50. What is the time span for the bud stage?
8th week
Trauma - pressure or metabolic disease
Abnormally large teeth
The enamel organ is compressed