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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 hard tissue is innervated by nerves?
Hereditary
Dentin and alveolar bone
It disintegrates as the developing oral mucosa comes to line the oral cavity
Preameloblasts

2. What is the outer portion of the ectoderm in the initiation stage?
Imbrication lines of von Ebner
The cementum - PDL - and alveolar bone
The bud stage
Oral epithelium

3. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental tissues fully mineralize to their mature levels.
The ectomesenchyme
The apposition of the enamel matrix
Dental papilla

4. What else undergoes proliferation in the bud stage besides the dental lamina?
The ectomesenchyme
Cuboidal cells
Odontoblasts
Initiation

5. What do the odontoblasts do?
11th to 12th weeks
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Sphere of enamel on root
The actual vertical movement of the tooth

6. What are the mature cells for enamel?
A mineralized cylinder - the dentinal tubule
There are none - they are lost with eruption
When the gingiva recedes and no actual tooth movement takes place
Union of root structure of two or more teeth by cementum

7. What type of tissue is enamel?
Only dentinal tubules with processes
The cervical loop
When the gingiva recedes and no actual tooth movement takes place
Epithelial

8. What is microdontia?
The ectomesenchyme
Induction - proliferation
Abnormally small teeth
Hereditary in localized form. endocrine dysfunction is complete

9. What stage does supernumerary teeth occur?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Initiation
The tooth germ
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

10. What kind of cells occur in the outer enamel epithelium in the bell stage?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Cuboidal cells
The ectomesenchyme - which was influenced by the neural crest cells
Oral epithelium

11. What happens during the appositional stage?
Initiation
Enamel pearl - enamel dysplasia - and concresence
The enamel - dentin - and cementum are secreted in successive layers
The ectomesenchyme - which was influenced by the neural crest cells

12. What is the embryological background for enamel?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Enamel organ
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Hereditary

13. What are the etiological factors for anodontia?
Dens in dente - gemination - tubercle - and fusion
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The outer cells of the dental papilla and the central cells of the dental papilla
Morphogenesis

14. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Maturation
Cementoblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface

15. What happens to the thickened non tooth producing portions of the dental lamina eventually?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Development of one or more extra teeth
There is unequal growth in different parts of the tooth bud
Maturation

16. When does the tooth bud become a tooth germ?
Union of root structure of two or more teeth by cementum
In the cap stage
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Into odontoblasts

17. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
Cementoblasts
Dental tissues secreted as matrix in successive layers.
Dental tissues fully mineralize to their mature levels.

18. What is enamel dysplasia?
Imbrication lines of von Ebner
Lines of Retzuis
The dental lamina
Faulty development of enamel from interference involving ameloblasts

19. How many types of cells are found in the enamel organ in the bell stage?
4 types
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
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 successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

20. What are the incremental lines for enamel?
Lines of Retzuis
A mineralized cylinder - the dentinal tubule
The basement membrane
Cementoblasts

21. What are the development disturbances of the apposition and maturation stages?
Differentiation - proliferation - morphogenesis
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 successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Enamel pearl - enamel dysplasia - and concresence

22. What are the etiological factors for dens in dente and gemination?
Imbrication lines of von Ebner
Hereditary
Lines of Retzuis
Enamel pearl - enamel dysplasia - and concresence

23. What is an enamel pearl?
Trauma - pressure or metabolic disease
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Enamel organ
Sphere of enamel on root

24. What happens during initiation?
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
Absence of single or multiple teeth
The cervical loop
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

25. Passive eruption
The enamel - dentin - and cementum are secreted in successive layers
Maturation
When the gingiva recedes and no actual tooth movement takes place
Dental follicle

26. What are the clinical ramifications?
Hereditary in localized form. endocrine dysfunction is complete
6th to 7th weeks
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Common on permanent molars or cingulum of anterior teeth

27. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
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.
Differentiation - proliferation - morphogenesis

28. What stage does anodontia occur?
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
Dental tissues fully mineralize to their mature levels.
Initiation stage
Epithelial rests of Malassez

29. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface
Cementocytes
The permanent molars

30. What is macrodontia?
Enamel organ invaginates into the dental papilla
Abnormally large teeth
Tooth germ tries to divide
There are none - they are lost with eruption

31. What are the etiological factors of tubercle?
Maturation
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Odontogenesis
Trauma - pressure or metabolic disease

32. What is the cap in the cap stage?
The tooth germ
The enamel organ
The enamel - dentin - and cementum are secreted in successive layers
Odontoblastic process

33. Active eruption
Epithelial
Compressed layer of flat to cuboidal cells
The actual vertical movement of the tooth
Cementoblasts

34. What is the predominate process in the bell stage?
The enamel organ is compressed
There are none - they are lost with eruption
Differentiation
Dentin secreting cells (odontoblats)

35. The stellate reticulum is located inner or outer?
Dental tissues secreted as matrix in successive layers.
The bud stage
A mineralized cylinder - the dentinal tubule
Outer

36. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Dental papilla
Cementoid
The basement membrane
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

37. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Preameloblasts
Tooth germ
The enamel organ
Only dentinal tubules with processes

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

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39. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Extra cusp due to effects on enamel organ
Dental tissues fully mineralize to their mature levels.
Odontoblastic process

40. What are the clinical ramifications of anodontia?
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
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The tooth germ
Differentiation

41. What are entrapped cementoblasts called?
Cementocytes
Odontoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Enamel pearl - enamel dysplasia - and concresence

42. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
Only dentinal tubules with processes
11th to 12th weeks
The basement membrane

43. What are the clinical ramifications of supernumerary teeth?
Inner
Hereditary in localized form. endocrine dysfunction is complete
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Future dentin and pulp tissue

44. Do odontoblasts start their secretion of matrix before the ameloblasts?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Faulty development of enamel from interference involving ameloblasts
9th to 10th weeks

45. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Future dentin and pulp tissue
The bud stage
Hereditary
During the cap stage

46. What are the etiological factors of concrescence?
Cementocytes
Epithelial
Trauma - pressure or metabolic disease
Traumatic injury or crowding of teeth

47. Which teeth are nonsuccedaneous?
Union of root structure of two or more teeth by cementum
The cervical loop
The permanent molars
It disintegrates as the developing oral mucosa comes to line the oral cavity

48. What kind of cells occur in the inner enamel epithelium?
Faulty development of enamel from interference involving ameloblasts
Enamel
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Tall columnar cells

49. What are the formative cells for dentin?
Faulty development of enamel from interference involving ameloblasts
Alveolar bone
Hereditary
Odontoblasts

50. What causes the induction of the preameloblasts to differentiate into ameloblasts?
During the cap stage
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Trauma - pressure or metabolic disease
Induction