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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. What are the clinical ramifications of dens in dente?
Faulty development of enamel from interference involving ameloblasts
The cementum - PDL - and alveolar bone
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Enamel organ

2. What is enamel dysplasia?
Imbrication lines of von Ebner
When the gingiva recedes and no actual tooth movement takes place
Hereditary
Faulty development of enamel from interference involving ameloblasts

3. What happens to the thickened non tooth producing portions of the dental lamina eventually?
A mineralized cylinder - the dentinal tubule
Apposition of the cementum
During the cap stage
It disintegrates as the developing oral mucosa comes to line the oral cavity

4. What is fusion?
Union of 2 adjacent tooth germs
Enamel secreting cells (ameloblasts)
Tooth germ tries to divide
Cementocytes

5. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Tall columnar cells
Displacement of ameloblasts to root surface
There are none - they are lost with eruption

6. Which layer in the bell stage has star shaped cells?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The stellate reticulum
Odontoblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

7. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
The enamel organ - dental papilla - dental sac
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The enamel organ

8. What processes are involved with the apposition stage?
The outer enamel epithelium
Odontoblastic process
Induction - proliferation
The basement membrane that seperates the enamel organ and dental papilla

9. What layer serves as protection for the enamel organ?
The actual vertical movement of the tooth
Enamel organ
The outer enamel epithelium
Morphogenesis

10. Where is the dental sac originally derived from?
The ectomesenchyme
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Differentiation - proliferation - morphogenesis
Osteoblasts

11. What stage does the dental tissues subsequently fully mineralize
The ameloblasts place an acellular dental cuticle on the new enamel surface
Enamel organ invaginates into the dental papilla
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.
Maturation

12. The stellate reticulum is located inner or outer?
Outer
Enamel organ invaginates into the dental papilla
Induction
The dental lamina

13. What are the incremental lines for dentin?
Dens in dente - gemination - tubercle - and fusion
Imbrication lines of von Ebner
There is unequal growth in different parts of the tooth bud
There are none - they are lost with eruption

14. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Union of root structure of two or more teeth by cementum
The actual vertical movement of the tooth
Dental tissues secreted as matrix in successive layers.
Odontoclasts

15. What are the etiological factors of tubercle?
The dental lamina
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
Trauma - pressure or metabolic disease
Proliferation - differentiation - morphogenesis

16. When does macro/microdontia occur?
Bud stage
Epithelial
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The ectomesenchyme

17. Where is the dental papilla originally derived from?
The enamel - dentin - and cementum are secreted in successive layers
The ectomesenchyme - which was influenced by the neural crest cells
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Epithelial

18. What are succedaneous teeth?
Differentiation
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

19. 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
Abnormally large teeth
Arrest and reversal lines
Apposition of the cementum

20. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The bud stage
The basement membrane
Lines of Retzuis
Dental papilla

21. What is concrescence?
Union of root structure of two or more teeth by cementum
Lines of Retzuis
Enamel organ
The ameloblasts

22. What are the clinical ramifications of enamel pearl?
Inner
Only dentinal tubules with processes
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
May be confused as calculus deposit on root

23. When does dens in dente occur?
Differentiation - proliferation - morphogenesis
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
During the cap stage
Future dentin and pulp tissue

24. What happens during the appositional stage?
Maturation
The enamel - dentin - and cementum are secreted in successive layers
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.
Extra cusp due to effects on enamel organ

25. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Dental tissues secreted as matrix in successive layers.
Abnormally large teeth
Dentin and alveolar bone

26. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Dental follicle
The dental sac
As a result of the apposition of cementum over dentin
Dental papilla

27. What is the cementum matrix called?
Hereditary
The cervical loop
Cementoid
Local or systemic or hereditary

28. What are the clinical ramifications of fusion?
During the cap stage
The apposition of the enamel matrix
Hereditary in localized form. endocrine dysfunction is complete
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

29. What happens during the cap 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
4 types
8th week
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.

30. The stratum intermediate is located inner or outer?
The stellate reticulum
Tooth germ
Inner
Oral epithelium

31. What type of tissue is dentin - cementum - and alveolar bone?
Connective
The enamel organ
Initiation stage
The ameloblasts

32. What is cementogenisis?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Apposition of the cementum
As a result of the apposition of cementum over dentin
The cementum - PDL - and alveolar bone

33. What happens during initiation?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The dental sac
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 enamel organ - dental papilla - dental sac

34. What are supernumerary teeth?
Odontoblasts
Development of one or more extra teeth
Cementocytes
Connective

35. What hard tissue is can not have tissue formation after eruption?
Tooth germ tries to divide
The dental sac
Enamel
Cementocytes

36. What else undergoes proliferation in the bud stage besides the dental lamina?
The basement membrane
The ectomesenchyme
8th week
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

37. What are the etiological factors of concrescence?
Cementoid
The outer enamel epithelium
Traumatic injury or crowding of teeth
The stellate reticulum

38. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
9th to 10th weeks
Union of root structure of two or more teeth by cementum
8th week

39. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Hereditary
Connective
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

40. What happens during the maturation stage?
Proliferation
Dental tissues fully mineralize to their mature levels.
Commonly involves permanent maxillary lateral incisor and 3rd molars
Tooth germ tries to divide

41. What kind of cells reside in the stratum intermediate?
Lines of Retzuis
Compressed layer of flat to cuboidal cells
Local or systemic or hereditary
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

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

43. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Tooth germ
Dental papilla
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
May be confused as calculus deposit on root

44. What is the main process involved in initiation?
Absence of single or multiple teeth
Induction
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 actual vertical movement of the tooth

45. What processes are involved in the bell stage?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The ectomesenchyme
Differentiation - proliferation - morphogenesis
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

46. How is the dentinocemental junction formed?
6th to 7th weeks
As a result of the apposition of cementum over dentin
4 types
Cementoblasts

47. What are the odontoblastic processes is contained in what?
Union of 2 adjacent tooth germs
A mineralized cylinder - the dentinal tubule
The ectomesenchyme
In the cap stage

48. What do the odontoblasts do?
Enamel organ
Ameloblasts
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.
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

49. What are the incremental lines for cementum and alveolar bone?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Arrest and reversal lines
Bud stage
When the gingiva recedes and no actual tooth movement takes place

50. What is macrodontia?
Cuboidal cells
It disintegrates as the developing oral mucosa comes to line the oral cavity
Abnormally large teeth
Cementoblasts