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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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1. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The tooth germ
Commonly involves permanent maxillary lateral incisor and 3rd molars

2. What else undergoes proliferation in the bud stage besides the dental lamina?
Outer
The ectomesenchyme
Tall columnar cells
The enamel organ - dental papilla - dental sac

3. What type of tissue is dentin - cementum - and alveolar bone?
The enamel organ - dental papilla - dental sac
Epithelial rests of Malassez
The apposition of the enamel matrix
Connective

4. What are the clinical ramifications?
Enamel organ
Maturation
Common on permanent molars or cingulum of anterior teeth
The basement membrane

5. What is the predominate process in the bell stage?
Differentiation
The bud stage
Future dentin and pulp tissue
Alveolar bone

6. What processes are involved with the apposition stage?
Enamel secreting cells (ameloblasts)
The basement membrane
Induction - proliferation
Compressed layer of flat to cuboidal cells

7. What will the dental papilla eventually form?
The enamel organ is compressed
Differentiation - proliferation - morphogenesis
Absence of single or multiple teeth
Future dentin and pulp tissue

8. What is macrodontia?
Maturation
Abnormally large teeth
The dental lamina
Hereditary

9. When does macro/microdontia occur?
Common with permanent maxillary molars
Bud stage
Extra cusp due to effects on enamel organ
Abnormally small teeth

10. What are the formative cells for enamel?
Ameloblasts
Imbrication lines of von Ebner
Commonly involves permanent maxillary lateral incisor and 3rd molars
Sphere of enamel on root

11. What is an enamel pearl?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Outer
Sphere of enamel on root
Lines of Retzuis

12. What are the clinical ramifications of dens in dente?
Cementocytes
The ectomesenchyme
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

13. What is microdontia?
The enamel organ is compressed
The ectomesenchyme
Proliferation - differentiation - morphogenesis
Abnormally small teeth

14. What are the cell layers found in the enamel organ in the bell stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dental tissues fully mineralize to their mature levels.
The permanent molars
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

15. What are the mature cells for cementum?
The primordium of the pulp
There is unequal growth in different parts of the tooth bud
Union of 2 adjacent tooth germs
Cementocytes

16. What happens when the reduced enamel epithelium is created?
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
Outer
11th to 12th weeks
Cementoblasts

17. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Absence of single or multiple teeth
Union of 2 adjacent tooth germs
Dentin and alveolar bone

18. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
Epithelial
Enamel organ
In the cap stage

19. What are the incremental lines for dentin?
Odontoclasts
Imbrication lines of von Ebner
In the cap stage
Tooth germ tries to divide

20. What stage does supernumerary teeth occur?
Enamel secreting cells (ameloblasts)
The dental lamina
Traumatic injury or crowding of teeth
Initiation

21. What are the etiological factors for enamel pearl?
Differentiation
Ameloblasts
Enamel secreting cells (ameloblasts)
Displacement of ameloblasts to root surface

22. What are supernumerary teeth?
During the cap stage
Development of one or more extra teeth
Trauma - pressure or metabolic disease
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.

23. What are the incremental lines for enamel?
Extra cusp due to effects on enamel organ
Dental papilla
Osteocytes
Lines of Retzuis

24. What kind of cells occur in the outer enamel epithelium in the bell stage?
Cuboidal cells
Preameloblasts
Dental papilla
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

25. When does dens in dente occur?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
During the cap stage
Cementoid

26. What wll the inner enamel epithelium differentiate into?
Hereditary in localized form. endocrine dysfunction is complete
Dentin and alveolar bone
Enamel secreting cells (ameloblasts)
Into odontoblasts

27. What is the main process involved in the bud stage?
Proliferation
Tooth germ tries to divide
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ectomesenchyme - which was influenced by the neural crest cells

28. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
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 ectoderm
The ectomesenchyme

29. What is the process involved in the maturation stage?
Maturation
The ectomesenchyme
Epithelial
Enamel secreting cells (ameloblasts)

30. What are the incremental lines for cementum and alveolar bone?
Oral epithelium
The ectomesenchyme - which was influenced by the neural crest cells
4 types
Arrest and reversal lines

31. What is the function of the Hertwig's epithelial root sheath?
8th week
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Proliferation - differentiation - morphogenesis
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

32. What hard tissue is can not have tissue formation after eruption?
Enamel
The ectomesenchyme
Odontoclasts
Connective

33. What are the etiological factors for dens in dente and gemination?
Hereditary
Proliferation
Odontoclasts
Osteoblasts

34. What are the clinical ramifications of anodontia?
Dental papilla
Epithelial rests of Malassez
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Oral epithelium

35. What are the etiological factors of tubercle?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Trauma - pressure or metabolic disease
When the gingiva recedes and no actual tooth movement takes place
The bud stage

36. Which teeth are nonsuccedaneous?
The permanent molars
Enamel pearl - enamel dysplasia - and concresence
In the cap stage
Dental tissues secreted as matrix in successive layers.

37. What do the odontoblasts do?
Abnormally large teeth
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
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

38. What hard tissue has vascularity?
Cementoblasts
Alveolar bone
Outer
Imbrication lines of von Ebner

39. Do odontoblasts start their secretion of matrix before the ameloblasts?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Maturation
Only dentinal tubules with processes
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

40. What are the etiological factors for micro/macrodontia?
The basement membrane that seperates the enamel organ and dental papilla
The cementum - PDL - and alveolar bone
Hereditary in localized form. endocrine dysfunction is complete
Preameloblasts

41. What is the structure responsible for root development?
Initiation
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The cervical loop
The cementum - PDL - and alveolar bone

42. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Alveolar bone
The actual vertical movement of the tooth
Odontoblastic process
The ectoderm

43. What happens during the apposition stage?
Future dentin and pulp tissue
Dental tissues secreted as matrix in successive layers.
The enamel organ is compressed
Into odontoblasts

44. Where is the dental papilla originally derived from?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Preameloblasts
6th to 7th weeks
The ectomesenchyme - which was influenced by the neural crest cells

45. 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
The permanent molars
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The dental sac

46. What are the etiological factors of enamel dysplasia?
Osteoblasts
Bud stage
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
Local or systemic or hereditary

47. What are the etiological factors for anodontia?
Inner
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Pressure on the area

48. What is dens in dente?
Enamel organ invaginates into the dental papilla
Cementoid
It disintegrates as the developing oral mucosa comes to line the oral cavity
Maturation

49. Active eruption
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
Cementoid
The actual vertical movement of the tooth
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

50. What is the cap in the cap stage?
Epithelial
Traumatic injury or crowding of teeth
The enamel organ
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium