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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 type of tissue is dentin - cementum - and alveolar bone?
The ectoderm
Connective
Morphogenesis
Epithelial rests of Malassez

2. What is macrodontia?
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 permanent molars
Abnormally large teeth
8th week

3. What is fusion?
The stellate reticulum
Union of 2 adjacent tooth germs
The apposition of the enamel matrix
Abnormally large teeth

4. What kind of cells reside in the stratum intermediate?
Apposition of the cementum
Dental tissues secreted as matrix in successive layers.
Enamel organ invaginates into the dental papilla
Compressed layer of flat to cuboidal cells

5. What are succedaneous teeth?
Local or systemic or hereditary
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The enamel organ
Alveolar bone

6. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Pressure on the area
Enamel secreting cells (ameloblasts)
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
Epithelial rests of Malassez

7. The stratum intermediate is located inner or outer?
Epithelial
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Enamel pearl - enamel dysplasia - and concresence
Inner

8. What are the clinical ramifications?
Bud stage
Common on permanent molars or cingulum of anterior teeth
Only dentinal tubules with processes
Morphogenesis

9. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The ectomesenchyme
Abnormally large teeth
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental papilla

10. What are the etiological factors of enamel dysplasia?
There are none - they are lost with eruption
The ectoderm
Dental tissues secreted as matrix in successive layers.
Local or systemic or hereditary

11. What are the etiological factors for supernumerary teeth?
Abnormally small teeth
Proliferation
Dentin and alveolar bone
Hereditary

12. What are the development disturbances of the apposition and maturation stages?
Inner
4 types
Enamel pearl - enamel dysplasia - and concresence
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

13. What are the mature cells for cementum?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Inner
Cementocytes
Common with permanent maxillary molars

14. The oral epithelium is induced by the ectomesenchyme to produce what?
A mineralized cylinder - the dentinal tubule
Ameloblasts
The dental lamina
Commonly involves permanent maxillary lateral incisor and 3rd molars

15. Passive eruption
Trauma - pressure or metabolic disease
When the gingiva recedes and no actual tooth movement takes place
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Osteoblasts

16. What are the formative cells for enamel?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Alveolar bone
Ameloblasts
4 types

17. Where is the dental papilla originally derived from?
8th week
Common on permanent molars or cingulum of anterior teeth
The enamel organ
The ectomesenchyme - which was influenced by the neural crest cells

18. When does the process of root development take place?
The stellate reticulum
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Maturation
Cementocytes

19. What are the processes involved in the cap stage?
9th to 10th weeks
Proliferation - differentiation - morphogenesis
The ectomesenchyme
Commonly involves permanent maxillary lateral incisor and 3rd molars

20. What are the incremental lines for cementum and alveolar bone?
Odontoblasts
The ectoderm
Arrest and reversal lines
Local or systemic or hereditary

21. What is the time span for the cap stage?
Imbrication lines of von Ebner
The basement membrane that seperates the enamel organ and dental papilla
Cuboidal cells
9th to 10th weeks

22. What is amelogenisis?
The apposition of the enamel matrix
The cementum - PDL - and alveolar bone
Dentin secreting cells (odontoblats)
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

23. What will the outer cells of the dental lamina differentiate into?
The permanent molars
Dentin secreting cells (odontoblats)
Displacement of ameloblasts to root surface
Dental tissues fully mineralize to their mature levels.

24. What do the odontoblasts do?
A bilayer rim that consists only IEE and OEE
The dental sac
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
There are none - they are lost with eruption

25. What stage does supernumerary teeth occur?
The enamel organ is compressed
Odontoclasts
Initiation
Commonly involves permanent maxillary lateral incisor and 3rd molars

26. What is dens in dente?
Enamel organ invaginates into the dental papilla
Differentiation - proliferation - morphogenesis
11th to 12th weeks
4 types

27. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
Bud stage
A mineralized cylinder - the dentinal tubule
Absence of single or multiple teeth

28. When does the tooth bud become a tooth germ?
4 types
Inner
The enamel organ is compressed
In the cap stage

29. What is an enamel pearl?
A mineralized cylinder - the dentinal tubule
Sphere of enamel on root
Bud stage
The ectomesenchyme

30. What is the embryological background for enamel?
Traumatic injury or crowding of teeth
Enamel organ
Absence of single or multiple teeth
Osteoblasts

31. What is the cementum matrix called?
Induction
Cementoid
The cementum - PDL - and alveolar bone
Epithelial rests of Malassez

32. What is the site for the future dentioenamel junction?
9th to 10th weeks
Hereditary
Differentiation
The basement membrane that seperates the enamel organ and dental papilla

33. Do odontoblasts start their secretion of matrix before the ameloblasts?
The primordium of the pulp
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Cementocytes

34. What happens during the cap stage?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The basement membrane
Dens in dente - gemination - tubercle - and fusion
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.

35. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The ectomesenchyme - which was influenced by the neural crest cells
Cementoblasts

36. What stage does anodontia occur?
A bilayer rim that consists only IEE and OEE
Initiation stage
Abnormally small teeth
Dental papilla

37. What are the incremental lines for enamel?
Lines of Retzuis
Differentiation
Connective
Initiation

38. What are supernumerary teeth?
Union of root structure of two or more teeth by cementum
Development of one or more extra teeth
Cementoid
Dental papilla

39. What is tubercle?
Induction
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Extra cusp due to effects on enamel organ
Odontoblastic process

40. What are the etiological factors for anodontia?
Epithelial
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dental tissues fully mineralize to their mature levels.
Cementocytes

41. What is the time span for the bud stage?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The permanent molars
Tall columnar cells
8th week

42. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Enamel
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
It disintegrates as the developing oral mucosa comes to line the oral cavity
Outer

43. Which teeth are nonsuccedaneous?
The permanent molars
Maturation
Differentiation
The primordium of the pulp

44. What are the formative cells for alveolar bone?
Osteoblasts
Faulty development of enamel from interference involving ameloblasts
Cementocytes
Oral epithelium

45. What are the etiological factors for dens in dente and gemination?
Enamel
Initiation stage
Tooth germ
Hereditary

46. What happens during initiation?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
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
Imbrication lines of von Ebner

47. What are the etiological factors for fusion?
Compressed layer of flat to cuboidal cells
Pressure on the area
Hereditary
Dental follicle

48. What are the clinical ramifications of dens in dente?
May be confused as calculus deposit on root
Compressed layer of flat to cuboidal cells
The actual vertical movement of the tooth
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

49. What is the main process involved in the bud stage?
The outer enamel epithelium
The primordium of the pulp
The ectoderm
Proliferation

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

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