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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?
Common on permanent molars or cingulum of anterior teeth
Dental tissues secreted as matrix in successive layers.
Proliferation - differentiation - morphogenesis
Only dentinal tubules with processes

2. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
Dentin secreting cells (odontoblats)
Lines of Retzuis
Oral epithelium

3. What is tubercle?
Faulty development of enamel from interference involving ameloblasts
During the cap stage
Extra cusp due to effects on enamel organ
Initiation

4. What stage does supernumerary teeth occur?
Preameloblasts
Initiation
Osteocytes
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

5. What is the time span for initiation?
6th to 7th weeks
Odontoclasts
The tooth germ
8th week

6. What are entrapped cementoblasts called?
The basement membrane
Odontoclasts
Cementocytes
11th to 12th weeks

7. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Union of root structure of two or more teeth by cementum
Only dentinal tubules with processes
Abnormally large teeth

8. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Tooth germ
The dental lamina
Osteocytes
The ameloblasts

9. What is cementogenisis?
Proliferation
11th to 12th weeks
The ectomesenchyme
Apposition of the cementum

10. How is the reduced enamel epithelium created?
The ectomesenchyme - which was influenced by the neural crest cells
Dental follicle
The permanent molars
The enamel organ is compressed

11. What are the mature cells for cementum?
Future dentin and pulp tissue
Cementocytes
Connective
Enamel pearl - enamel dysplasia - and concresence

12. What is the structure responsible for root development?
The enamel organ is compressed
The cervical loop
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

13. What is the main process involved in initiation?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Maturation
The outer enamel epithelium
Induction

14. What is matrix?
Epithelial rests of Malassez
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Commonly involves permanent maxillary lateral incisor and 3rd molars
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

15. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
The stellate reticulum
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The outer enamel epithelium

16. What wll the inner enamel epithelium differentiate into?
4 types
Enamel secreting cells (ameloblasts)
The cementum - PDL - and alveolar bone
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

17. What are the clinical ramifications of supernumerary teeth?
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.
Union of 2 adjacent tooth germs
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

18. What happens during the bell stage?
Dental tissues fully mineralize to their mature levels.
Induction - proliferation
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

19. What are the processes involved in the cap stage?
Lines of Retzuis
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Proliferation - differentiation - morphogenesis
Odontoblasts

20. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
There is unequal growth in different parts of the tooth bud
The permanent molars

21. The stratum intermediate is located inner or outer?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Inner
Tooth germ tries to divide

22. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
Hereditary
When the gingiva recedes and no actual tooth movement takes place
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

23. What is the predominate process of the cap stage?
Dental papilla
The enamel - dentin - and cementum are secreted in successive layers
Morphogenesis
Hereditary in localized form. endocrine dysfunction is complete

24. When does the tooth bud become a tooth germ?
There is unequal growth in different parts of the tooth bud
The outer enamel epithelium
In the cap stage
During the cap stage

25. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Osteocytes
The ectomesenchyme
Epithelial

26. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Dens in dente - gemination - tubercle - and fusion
The ameloblasts place an acellular dental cuticle on the new enamel surface
The basement membrane
The ectomesenchyme

27. What is the cap in the cap stage?
The enamel organ
Abnormally large teeth
The ameloblasts place an acellular dental cuticle on the new enamel surface
Epithelial rests of Malassez

28. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Connective
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
It disintegrates as the developing oral mucosa comes to line the oral cavity

29. What stage does anodontia occur?
As a result of the apposition of cementum over dentin
Initiation stage
Union of root structure of two or more teeth by cementum
Enamel organ

30. What are the etiological factors for supernumerary teeth?
Connective
Proliferation - differentiation - morphogenesis
Hereditary
The actual vertical movement of the tooth

31. What type of tissue is enamel?
Cuboidal cells
Dental tissues fully mineralize to their mature levels.
Hereditary
Epithelial

32. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
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 ectoderm
Odontoblasts

33. Active eruption
During the cap stage
The actual vertical movement of the tooth
Oral epithelium
Faulty development of enamel from interference involving ameloblasts

34. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
Development of one or more extra teeth
Cementoblasts
Cementocytes

35. What is the embryological background for dentin - cementum and alveolar bone?
Enamel
Dental papilla
Trauma - pressure or metabolic disease
The enamel - dentin - and cementum are secreted in successive layers

36. What are the formative cells for cementum?
Future dentin and pulp tissue
Preameloblasts
Cementoblasts
4 types

37. What is the time span for the bell stage?
11th to 12th weeks
Pressure on the area
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Union of root structure of two or more teeth by cementum

38. What do the odontoblasts do?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Cementocytes

39. When does dens in dente occur?
Enamel secreting cells (ameloblasts)
The primordium of the pulp
During the cap stage
Epithelial

40. What is the main process involved in the bud stage?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Apposition of the cementum
A mineralized cylinder - the dentinal tubule
Proliferation

41. What happens during the bud stage?
The basement membrane that seperates the enamel organ and dental papilla
The cervical loop
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Inner

42. What stage does the dental tissues subsequently fully mineralize
Into odontoblasts
Maturation
Abnormally large teeth
Tall columnar cells

43. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Proliferation
Odontoblastic process
The primordium of the pulp
The ectoderm

44. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Common on permanent molars or cingulum of anterior teeth
The basement membrane
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dental tissues secreted as matrix in successive layers.

45. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
The enamel organ - dental papilla - dental sac
It disintegrates as the developing oral mucosa comes to line the oral cavity
There are none - they are lost with eruption

46. What type of tissue is dentin - cementum - and alveolar bone?
As a result of the apposition of cementum over dentin
Abnormally large teeth
The ameloblasts place an acellular dental cuticle on the new enamel surface
Connective

47. What happens during the appositional stage?
Faulty development of enamel from interference involving ameloblasts
The enamel - dentin - and cementum are secreted in successive layers
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
Only dentinal tubules with processes

48. What are the major components of the tooth germ?
The permanent molars
Ameloblasts
The enamel organ - dental papilla - dental sac
9th to 10th weeks

49. What is the embryological background for enamel?
Cementocytes
Enamel organ
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.
The ameloblasts place an acellular dental cuticle on the new enamel surface

50. What is microdontia?
A mineralized cylinder - the dentinal tubule
Abnormally small teeth
Cementocytes
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane