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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?
Enamel secreting cells (ameloblasts)
Odontoclasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Odontoblastic process

2. What is an enamel pearl?
Preameloblasts
Sphere of enamel on root
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
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

3. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Apposition of the cementum
Dental papilla

4. Where is the dental sac originally derived from?
Dentin and alveolar bone
A mineralized cylinder - the dentinal tubule
The ectomesenchyme
Dental papilla

5. What are the incremental lines for enamel?
Lines of Retzuis
The cementum - PDL - and alveolar bone
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The ectomesenchyme

6. Do odontoblasts start their secretion of matrix before the ameloblasts?
Lines of Retzuis
The cervical loop
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Development of one or more extra teeth

7. What are the processes involved in the cap stage?
Enamel organ
The stellate reticulum
Proliferation - differentiation - morphogenesis
Dentin secreting cells (odontoblats)

8. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Absence of single or multiple teeth
A mineralized cylinder - the dentinal tubule

9. What is matrix?
Dentin and alveolar bone
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dens in dente - gemination - tubercle - and fusion
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

10. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Local or systemic or hereditary

11. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
Apposition of the cementum
Morphogenesis
Dental tissues fully mineralize to their mature levels.

12. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Inner
It disintegrates as the developing oral mucosa comes to line the oral cavity
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Dental papilla

13. What is enamel dysplasia?
Connective
Odontogenesis
Faulty development of enamel from interference involving ameloblasts
Tooth germ tries to divide

14. What processes are involved in the bell stage?
The dental sac
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
Differentiation - proliferation - morphogenesis

15. What are the mature cells for cementum?
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
Cementocytes
Cementoid
Sphere of enamel on root

16. What is the cementum matrix called?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Bud stage
Cementoid

17. What is the embryological background for enamel?
The permanent molars
Enamel organ
Dens in dente - gemination - tubercle - and fusion
The basement membrane

18. What is the predominate process in the bell stage?
The ameloblasts
Dental papilla
The ectomesenchyme
Differentiation

19. What are the clinical ramifications of enamel pearl?
Into odontoblasts
The dental lamina
May be confused as calculus deposit on root
In the cap stage

20. Which teeth are nonsuccedaneous?
Tooth germ tries to divide
The cementum - PDL - and alveolar bone
The permanent molars
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

21. What are the etiological factors for fusion?
Pressure on the area
Hereditary
The dental sac
Into odontoblasts

22. What are the formative cells for alveolar bone?
Dentin and alveolar bone
The enamel - dentin - and cementum are secreted in successive layers
Osteoblasts
The bud stage

23. Tooth development
Odontogenesis
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The cementum - PDL - and alveolar bone
Proliferation

24. What hard tissue is innervated by nerves?
The enamel organ
Ameloblasts
Bud stage
Dentin and alveolar bone

25. Which layer in the bell stage has star shaped cells?
The stellate reticulum
The enamel - dentin - and cementum are secreted in successive layers
Lines of Retzuis
Tall columnar cells

26. When does the tooth bud become a tooth germ?
9th to 10th weeks
In the cap stage
Odontogenesis
Lines of Retzuis

27. Where is the dental papilla originally derived from?
Common on permanent molars or cingulum of anterior teeth
Local or systemic or hereditary
The cervical loop
The ectomesenchyme - which was influenced by the neural crest cells

28. Where does the primordium of the permanent dentition develop?
Faulty development of enamel from interference involving ameloblasts
Connective
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Differentiation

29. What are the etiological factors for enamel pearl?
Differentiation - proliferation - morphogenesis
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Displacement of ameloblasts to root surface
There are none - they are lost with eruption

30. What type of tissue is dentin - cementum - and alveolar bone?
The enamel organ - dental papilla - dental sac
Connective
8th week
Alveolar bone

31. How many types of cells are found in the enamel organ in the bell stage?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
4 types
Cementoblasts
Odontoblasts

32. What happens during the apposition stage?
Differentiation - proliferation - morphogenesis
Dental tissues secreted as matrix in successive layers.
The basement membrane that seperates the enamel organ and dental papilla
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

33. What happens during the appositional stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Pressure on the area
As a result of the apposition of cementum over dentin
The enamel - dentin - and cementum are secreted in successive layers

34. When does macro/microdontia occur?
Bud stage
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
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
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

35. Active eruption
The actual vertical movement of the tooth
Connective
Cementocytes
Dental follicle

36. What are the etiological factors for supernumerary teeth?
Enamel pearl - enamel dysplasia - and concresence
The apposition of the enamel matrix
Hereditary
Lines of Retzuis

37. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Abnormally large teeth
Cementocytes
Dental follicle

38. What are the major components of the tooth germ?
Induction
The enamel organ - dental papilla - dental sac
The stellate reticulum
Extra cusp due to effects on enamel organ

39. Passive eruption
When the gingiva recedes and no actual tooth movement takes place
Preameloblasts
The bud stage
Displacement of ameloblasts to root surface

40. What is the predominate process of the cap stage?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Morphogenesis

41. What kind of cells reside in the stratum intermediate?
The cervical loop
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.
Compressed layer of flat to cuboidal cells
Cementocytes

42. What are the etiological factors for dens in dente and gemination?
11th to 12th weeks
Hereditary
The enamel organ
As a result of the apposition of cementum over dentin

43. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Odontoclasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
A mineralized cylinder - the dentinal tubule

44. What are the formative cells for cementum?
Cementoblasts
Union of 2 adjacent tooth germs
Epithelial
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

45. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Initiation stage
Induction - proliferation
The basement membrane
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

46. What happens during the maturation stage?
The enamel organ - dental papilla - dental sac
Dental tissues fully mineralize to their mature levels.
Osteocytes
The outer cells of the dental papilla and the central cells of the dental papilla

47. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Into odontoblasts
Odontogenesis
Enamel secreting cells (ameloblasts)

48. What happens to the thickened non tooth producing portions of the dental lamina eventually?
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
The bud stage
It disintegrates as the developing oral mucosa comes to line the oral cavity
Into odontoblasts

49. What is amelogenisis?
The apposition of the enamel matrix
Dentin secreting cells (odontoblats)
The enamel organ is compressed
Cementoid

50. What is fusion?
Inner
Union of 2 adjacent tooth germs
When the gingiva recedes and no actual tooth movement takes place
Dentin secreting cells (odontoblats)