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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 predominate process in the bell stage?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Union of root structure of two or more teeth by cementum
Alveolar bone
Differentiation

2. What will the dental papilla eventually form?
Future dentin and pulp tissue
6th to 7th weeks
Odontoblasts
Maturation

3. What is dens in dente?
Enamel organ invaginates into the dental papilla
Enamel organ
The cervical loop
The dental sac

4. What is enamel dysplasia?
Induction - proliferation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Faulty development of enamel from interference involving ameloblasts
Cuboidal cells

5. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Cementoid
The ameloblasts place an acellular dental cuticle on the new enamel surface
Displacement of ameloblasts to root surface
Enamel organ invaginates into the dental papilla

6. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
Displacement of ameloblasts to root surface
When the gingiva recedes and no actual tooth movement takes place
Union of root structure of two or more teeth by cementum

7. What is the predominate process of the cap stage?
4 types
Connective
Morphogenesis
Sphere of enamel on root

8. What is the process involved in the maturation stage?
Proliferation - differentiation - morphogenesis
Maturation
Common on permanent molars or cingulum of anterior teeth
Extra cusp due to effects on enamel organ

9. What do the odontoblasts do?
Tooth germ tries to divide
When the gingiva recedes and no actual tooth movement takes place
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Local or systemic or hereditary

10. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
8th week
Dental tissues secreted as matrix in successive layers.
There are none - they are lost with eruption
Cementoblasts

11. What wll the inner enamel epithelium differentiate into?
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.
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The primordium of the pulp
Enamel secreting cells (ameloblasts)

12. What are supernumerary teeth?
Development of one or more extra teeth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Into odontoblasts
The actual vertical movement of the tooth

13. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
The outer enamel epithelium
Local or systemic or hereditary
Common with permanent maxillary molars

14. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Into odontoblasts
Cementoblasts
Odontoclasts

15. What are the formative cells for dentin?
Odontoblasts
As a result of the apposition of cementum over dentin
The basement membrane
It disintegrates as the developing oral mucosa comes to line the oral cavity

16. When does dens in dente occur?
Abnormally small teeth
The cervical loop
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
During the cap stage

17. What else undergoes proliferation in the bud stage besides the dental lamina?
The ectomesenchyme
Imbrication lines of von Ebner
Enamel organ
Initiation stage

18. What are the clinical ramifications?
Dentin secreting cells (odontoblats)
It disintegrates as the developing oral mucosa comes to line the oral cavity
Pressure on the area
Common on permanent molars or cingulum of anterior teeth

19. How many types of cells are found in the enamel organ in the bell stage?
The apposition of the enamel matrix
Bud stage
4 types
Enamel

20. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Initiation stage
Odontoclasts
Development of one or more extra teeth

21. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
The outer enamel epithelium
Cementocytes
A bilayer rim that consists only IEE and OEE

22. What is the function of the Hertwig's epithelial root sheath?
Cementoblasts
Arrest and reversal lines
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

23. What are the formative cells for cementum?
Cementoblasts
Maturation
The outer enamel epithelium
Maturation

24. What is concrescence?
Union of root structure of two or more teeth by cementum
Pressure on the area
Odontoblasts
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

25. What is the time span for initiation?
Dentin and alveolar bone
8th week
Union of 2 adjacent tooth germs
6th to 7th weeks

26. Which layer in the bell stage has star shaped cells?
Tooth germ
The stellate reticulum
Oral epithelium
Pressure on the area

27. What are the incremental lines for dentin?
Imbrication lines of von Ebner
The permanent molars
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
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

28. What hard tissue is can not have tissue formation after eruption?
The dental lamina
The actual vertical movement of the tooth
Common on permanent molars or cingulum of anterior teeth
Enamel

29. What happens during the bud stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The ameloblasts place an acellular dental cuticle on the new enamel surface

30. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Induction - proliferation
The basement membrane
Dental tissues fully mineralize to their mature levels.
The ameloblasts place an acellular dental cuticle on the new enamel surface

31. What is the primordium of the tooth?
Preameloblasts
The tooth germ
When the gingiva recedes and no actual tooth movement takes place
Dentin secreting cells (odontoblats)

32. What is the site for the future dentioenamel junction?
Dental follicle
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The basement membrane that seperates the enamel organ and dental papilla
Dental papilla

33. What is fusion?
Apposition of the cementum
Lines of Retzuis
8th week
Union of 2 adjacent tooth germs

34. Where is the enamal organ originally derived from?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Union of 2 adjacent tooth germs
The ectoderm
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

35. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Dental papilla
The outer cells of the dental papilla and the central cells of the dental papilla
The basement membrane
Development of one or more extra teeth

36. What happens during initiation?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dental papilla
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
Common on permanent molars or cingulum of anterior teeth

37. When does macro/microdontia occur?
Differentiation - proliferation - morphogenesis
4 types
Union of 2 adjacent tooth germs
Bud stage

38. What are the mature cells for enamel?
The dental lamina
The enamel organ
Oral epithelium
There are none - they are lost with eruption

39. What kind of cells occur in the outer enamel epithelium in the bell stage?
Osteocytes
In the cap stage
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Cuboidal cells

40. What are the clinical ramifications of fusion?
Abnormally small teeth
Bud stage
The dental sac
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

41. Passive eruption
Development of one or more extra teeth
Dentin secreting cells (odontoblats)
During the cap stage
When the gingiva recedes and no actual tooth movement takes place

42. What hard tissue is innervated by nerves?
Cementocytes
Dentin and alveolar bone
Hereditary
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

43. What is cementogenisis?
Apposition of the cementum
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
In the cap stage
Tooth germ

44. What is anodontia?
Absence of single or multiple teeth
9th to 10th weeks
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Enamel secreting cells (ameloblasts)

45. What happens to the thickened non tooth producing portions of the dental lamina eventually?
The ameloblasts
Cementocytes
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
It disintegrates as the developing oral mucosa comes to line the oral cavity

46. What is the structure responsible for root development?
Initiation
A mineralized cylinder - the dentinal tubule
The apposition of the enamel matrix
The cervical loop

47. What is the outer portion of the ectoderm in the initiation stage?
Abnormally large teeth
Apposition of the cementum
Differentiation
Oral epithelium

48. What is the time span for the cap stage?
9th to 10th weeks
Abnormally small teeth
8th week
Extra cusp due to effects on enamel organ

49. What happens during the apposition stage?
Abnormally small teeth
Imbrication lines of von Ebner
Dental tissues secreted as matrix in successive layers.
Epithelial

50. The oral epithelium is induced by the ectomesenchyme to produce what?
The primordium of the pulp
Only dentinal tubules with processes
Compressed layer of flat to cuboidal cells
The dental lamina