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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 is the function of the Hertwig's epithelial root sheath?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Outer
Cuboidal cells
Connective

2. The preameloblasts induce dental papilla cells to differentiate into what?
The actual vertical movement of the tooth
Dental follicle
Into odontoblasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

3. What is the cap in the cap stage?
Cementocytes
The enamel organ - dental papilla - dental sac
The basement membrane
The enamel organ

4. What is an enamel pearl?
8th week
Sphere of enamel on root
Maturation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

5. What type of tissue is dentin - cementum - and alveolar bone?
Connective
The dental lamina
9th to 10th weeks
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

6. What are the etiological factors for fusion?
Pressure on the area
In the cap stage
Enamel organ invaginates into the dental papilla
4 types

7. What is the time span for the bud stage?
8th week
Cementoid
Hereditary
Extra cusp due to effects on enamel organ

8. What type of tissue is enamel?
Epithelial
Dentin and alveolar bone
During the cap stage
The enamel organ

9. When does the tooth bud become a tooth germ?
In the cap stage
Dental follicle
11th to 12th weeks
The dental sac

10. What is enamel dysplasia?
Induction - proliferation
The ectomesenchyme - which was influenced by the neural crest cells
Faulty development of enamel from interference involving ameloblasts
Maturation

11. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Into odontoblasts
Dental papilla
Tooth germ
The primordium of the pulp

12. What is another name for the dental sac?
Development of one or more extra teeth
The enamel organ is compressed
The actual vertical movement of the tooth
Dental follicle

13. What are the formative cells for enamel?
The basement membrane that seperates the enamel organ and dental papilla
The ectoderm
Ameloblasts
A bilayer rim that consists only IEE and OEE

14. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Faulty development of enamel from interference involving ameloblasts
Odontoclasts
The dental sac
The dental lamina

15. What are the formative cells for alveolar bone?
Induction
Osteoblasts
Traumatic injury or crowding of teeth
Initiation stage

16. What stage does the dental tissues subsequently fully mineralize
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Maturation
The enamel organ is compressed
The enamel - dentin - and cementum are secreted in successive layers

17. What is dens in dente?
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
May be confused as calculus deposit on root
Enamel organ invaginates into the dental papilla

18. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Commonly involves permanent maxillary lateral incisor and 3rd molars

19. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dental follicle
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dental tissues secreted as matrix in successive layers.

20. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
Dental papilla
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Cementocytes

21. What hard tissue has vascularity?
The permanent molars
Dental tissues secreted as matrix in successive layers.
Alveolar bone
Union of 2 adjacent tooth germs

22. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Oral epithelium
9th to 10th weeks
The cervical loop
Preameloblasts

23. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
Preameloblasts
Odontoblastic process
Cementoblasts

24. What is macrodontia?
Trauma - pressure or metabolic disease
The cervical loop
Enamel organ invaginates into the dental papilla
Abnormally large teeth

25. What is the structure responsible for root development?
The enamel organ - dental papilla - dental sac
Dental papilla
A bilayer rim that consists only IEE and OEE
The cervical loop

26. Where does the primordium of the permanent dentition develop?
There is unequal growth in different parts of the tooth bud
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
9th to 10th weeks
It disintegrates as the developing oral mucosa comes to line the oral cavity

27. When does the process of root development take place?
Odontogenesis
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The enamel organ is compressed

28. When does macro/microdontia occur?
Preameloblasts
Dental papilla
Bud stage
Tall columnar cells

29. What else undergoes proliferation in the bud stage besides the dental lamina?
The enamel organ - dental papilla - dental sac
Faulty development of enamel from interference involving ameloblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The ectomesenchyme

30. What is matrix?
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 bud stage
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

31. What is microdontia?
Abnormally small teeth
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Odontogenesis
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

32. Where is the enamal organ originally derived from?
Epithelial rests of Malassez
The ectoderm
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The permanent molars

33. The oral epithelium is induced by the ectomesenchyme to produce what?
Tooth germ tries to divide
The dental lamina
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
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.

34. What is tubercle?
11th to 12th weeks
Extra cusp due to effects on enamel organ
Differentiation - proliferation - morphogenesis
Future dentin and pulp tissue

35. What are the formative cells for dentin?
Odontoblasts
The ectomesenchyme - which was influenced by the neural crest cells
Initiation
Dental tissues fully mineralize to their mature levels.

36. What is amelogenisis?
Dental follicle
The apposition of the enamel matrix
Sphere of enamel on root
Cementoid

37. What processes are involved in the bell stage?
Maturation
The basement membrane
Commonly involves permanent maxillary lateral incisor and 3rd molars
Differentiation - proliferation - morphogenesis

38. The stratum intermediate is located inner or outer?
Sphere of enamel on root
Differentiation - proliferation - morphogenesis
Inner
Compressed layer of flat to cuboidal cells

39. What are the etiological factors of concrescence?
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
Traumatic injury or crowding of teeth
There are none - they are lost with eruption
Dental papilla

40. What are the odontoblastic processes is contained in what?
Hereditary
A mineralized cylinder - the dentinal tubule
The ameloblasts place an acellular dental cuticle on the new enamel surface
The outer enamel epithelium

41. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Cementoblasts
Induction
The enamel organ

42. What are the incremental lines for cementum and alveolar bone?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Epithelial
Arrest and reversal lines
In the cap stage

43. What are the clinical ramifications of concrescence?
Dentin and alveolar bone
Bud stage
Abnormally small teeth
Common with permanent maxillary molars

44. What is the main process involved in initiation?
Dental papilla
Induction
Enamel pearl - enamel dysplasia - and concresence
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.

45. What does the cervical loop consist of?
Cuboidal cells
A bilayer rim that consists only IEE and OEE
Proliferation
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

46. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
Odontoblasts
As a result of the apposition of cementum over dentin
The dental sac

47. What is the embryological background for enamel?
Trauma - pressure or metabolic disease
Bud stage
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Enamel organ

48. What will the dental papilla eventually form?
Initiation
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
A mineralized cylinder - the dentinal tubule
Future dentin and pulp tissue

49. What is concrescence?
Dental follicle
The stellate reticulum
Hereditary in localized form. endocrine dysfunction is complete
Union of root structure of two or more teeth by cementum

50. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Dental tissues secreted as matrix in successive layers.
Displacement of ameloblasts to root surface
4 types