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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 cap in the cap stage?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Development of one or more extra teeth
There is unequal growth in different parts of the tooth bud
The enamel organ

2. When does the tooth bud become a tooth germ?
In the cap stage
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Tooth germ
8th week

3. What is the main process involved in initiation?
Common on permanent molars or cingulum of anterior teeth
Morphogenesis
The apposition of the enamel matrix
Induction

4. Tooth development
Odontogenesis
Epithelial
Maturation
Absence of single or multiple teeth

5. What is another name for the dental sac?
Traumatic injury or crowding of teeth
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The basement membrane
Dental follicle

6. What are the formative cells for dentin?
Odontoblasts
Cementoblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

7. What are the formative cells for enamel?
Trauma - pressure or metabolic disease
Cementoblasts
Ameloblasts
Enamel secreting cells (ameloblasts)

8. What hard tissue is can not have tissue formation after eruption?
Only dentinal tubules with processes
Enamel
Dentin and alveolar bone
Hereditary

9. What do the odontoblasts do?
Common on permanent molars or cingulum of anterior teeth
9th to 10th weeks
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Morphogenesis

10. What are the formative cells for cementum?
The basement membrane
The ameloblasts
Cementoblasts
The enamel organ - dental papilla - dental sac

11. What type of tissue is dentin - cementum - and alveolar bone?
The cementum - PDL - and alveolar bone
The enamel organ is compressed
Connective
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

12. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Abnormally small teeth
Dental papilla
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
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

13. What is the predominate process of the cap stage?
The ectomesenchyme
The ectomesenchyme
Morphogenesis
Odontoblasts

14. 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
Dental papilla
Imbrication lines of von Ebner
Tooth germ tries to divide

15. What are the etiological factors for supernumerary teeth?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The bud stage
Hereditary

16. What happens during the maturation stage?
Induction
Cementocytes
Dental tissues fully mineralize to their mature levels.
Trauma - pressure or metabolic disease

17. What type of tissue is enamel?
The apposition of the enamel matrix
Epithelial
Bud stage
Dentin and alveolar bone

18. What are the mature cells for enamel?
There are none - they are lost with eruption
The apposition of the enamel matrix
It disintegrates as the developing oral mucosa comes to line the oral cavity
Alveolar bone

19. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
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 basement membrane
In the cap stage
Traumatic injury or crowding of teeth

20. What is macrodontia?
Tooth germ
The ectomesenchyme
Abnormally large teeth
The bud stage

21. What are the etiological factors of enamel dysplasia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Local or systemic or hereditary
Ameloblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

22. What processes are involved with the apposition stage?
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
Commonly involves permanent maxillary lateral incisor and 3rd molars
Induction - proliferation
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

23. What are entrapped cementoblasts called?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Cementocytes
The basement membrane

24. What happens during the bell stage?
The basement membrane
Epithelial rests of Malassez
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The basement membrane

25. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The ectomesenchyme - which was influenced by the neural crest cells
Differentiation - proliferation - morphogenesis
In the cap stage
The dental sac

26. What causes the induction of the preameloblasts to differentiate into ameloblasts?
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 outer enamel epithelium
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dentin secreting cells (odontoblats)

27. When does dens in dente occur?
During the cap stage
Absence of single or multiple teeth
Dental follicle
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.

28. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane that seperates the enamel organ and dental papilla
The ectomesenchyme - which was influenced by the neural crest cells
The basement membrane
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

29. What are the odontoblastic processes is contained in what?
Cementocytes
A mineralized cylinder - the dentinal tubule
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Initiation

30. What are the formative cells for alveolar bone?
Osteoblasts
Faulty development of enamel from interference involving ameloblasts
Abnormally small teeth
Hereditary

31. The oral epithelium is induced by the ectomesenchyme to produce what?
Abnormally large teeth
Cuboidal cells
The dental lamina
The primordium of the pulp

32. What are the etiological factors for dens in dente and gemination?
Hereditary
The actual vertical movement of the tooth
The primordium of the pulp
Common with permanent maxillary molars

33. What layer serves as protection for the enamel organ?
The ectomesenchyme
Bud stage
The outer enamel epithelium
Tall columnar cells

34. Where is the dental sac originally derived from?
6th to 7th weeks
Hereditary in localized form. endocrine dysfunction is complete
The ectomesenchyme
Cementocytes

35. What will the outer cells of the dental lamina differentiate into?
The basement membrane
Dentin secreting cells (odontoblats)
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The ectomesenchyme - which was influenced by the neural crest cells

36. Passive eruption
The ectomesenchyme - which was influenced by the neural crest cells
When the gingiva recedes and no actual tooth movement takes place
Induction - proliferation
Sphere of enamel on root

37. What are the etiological factors for fusion?
Tall columnar cells
11th to 12th weeks
The actual vertical movement of the tooth
Pressure on the area

38. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
The primordium of the pulp
There are none - they are lost with eruption
11th to 12th weeks
Epithelial rests of Malassez

39. What is amelogenisis?
Dental follicle
The apposition of the enamel matrix
9th to 10th weeks
Development of one or more extra teeth

40. What is the cementum matrix called?
Cementoid
Connective
The cementum - PDL - and alveolar bone
Initiation stage

41. Which layer in the bell stage has star shaped cells?
The stellate reticulum
The actual vertical movement of the tooth
Cementoid
Compressed layer of flat to cuboidal cells

42. What are the processes involved in the cap stage?
The cervical loop
Proliferation - differentiation - morphogenesis
Pressure on the area
It disintegrates as the developing oral mucosa comes to line the oral cavity

43. What is the primordium of the tooth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Epithelial rests of Malassez
The tooth germ
The ectomesenchyme - which was influenced by the neural crest cells

44. What is concrescence?
11th to 12th weeks
Local or systemic or hereditary
Apposition of the cementum
Union of root structure of two or more teeth by cementum

45. What happens during the apposition stage?
When the gingiva recedes and no actual tooth movement takes place
Dental tissues secreted as matrix in successive layers.
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
During the cap stage

46. The stratum intermediate is located inner or outer?
The dental sac
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Inner
The basement membrane

47. What else undergoes proliferation in the bud stage besides the dental lamina?
Osteocytes
The ectomesenchyme
Sphere of enamel on root
The tooth germ

48. What is the embryological background for enamel?
6th to 7th weeks
Odontogenesis
Enamel organ
The permanent molars

49. What are the mature cells for dentin?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Only dentinal tubules with processes
Dental tissues fully mineralize to their mature levels.
Pressure on the area

50. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Enamel pearl - enamel dysplasia - and concresence
Abnormally large teeth