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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. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Inner
Development of one or more extra teeth
Faulty development of enamel from interference involving ameloblasts
Epithelial rests of Malassez

2. Passive eruption
Dental papilla
Hereditary
Imbrication lines of von Ebner
When the gingiva recedes and no actual tooth movement takes place

3. What is fusion?
Dental papilla
There is unequal growth in different parts of the tooth bud
Union of 2 adjacent tooth germs
Hereditary in localized form. endocrine dysfunction is complete

4. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
The basement membrane
Enamel pearl - enamel dysplasia - and concresence
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

5. What are the mature cells for cementum?
The enamel - dentin - and cementum are secreted in successive layers
The stellate reticulum
The enamel organ - dental papilla - dental sac
Cementocytes

6. What is the predominate process of the cap stage?
Abnormally small teeth
Morphogenesis
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

7. What are the etiological factors of enamel dysplasia?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Union of root structure of two or more teeth by cementum
Local or systemic or hereditary
Induction - proliferation

8. Where does the primordium of the permanent dentition develop?
Dental papilla
Alveolar bone
Cementoblasts
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

9. What is the main process involved in the bud stage?
The enamel organ is compressed
9th to 10th weeks
Proliferation
Tall columnar cells

10. What are the formative cells for dentin?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Alveolar bone
Dentin and alveolar bone
Odontoblasts

11. What are the etiological factors for dens in dente and gemination?
The cementum - PDL - and alveolar bone
Dental papilla
Hereditary
Cementocytes

12. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The actual vertical movement of the tooth
Into odontoblasts

13. What is the function of the Hertwig's epithelial root sheath?
Differentiation
Oral epithelium
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Future dentin and pulp tissue

14. What are the development disturbances of the apposition and maturation stages?
Proliferation
Enamel pearl - enamel dysplasia - and concresence
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Compressed layer of flat to cuboidal cells

15. What are the clinical ramifications of enamel dysplasia?
Cementoblasts
Odontogenesis
During the cap stage
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

16. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
A bilayer rim that consists only IEE and OEE
The ectoderm
Abnormally small teeth

17. What are succedaneous teeth?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Odontoblastic process
Cuboidal cells

18. What are the major components of the tooth germ?
Pressure on the area
The enamel organ - dental papilla - dental sac
4 types
9th to 10th weeks

19. What happens during the cap stage?
Initiation 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
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.
Arrest and reversal lines

20. What is the cementum matrix called?
Differentiation
Common on permanent molars or cingulum of anterior teeth
Development of one or more extra teeth
Cementoid

21. What stage does the dental tissues subsequently fully mineralize
Maturation
Dens in dente - gemination - tubercle - and fusion
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Outer

22. What happens during initiation?
The bud stage
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
As a result of the apposition of cementum over dentin
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

23. What are the clinical ramifications of concrescence?
Dental tissues fully mineralize to their mature levels.
The ectoderm
8th week
Common with permanent maxillary molars

24. What is the main process involved in initiation?
Induction
Lines of Retzuis
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Enamel pearl - enamel dysplasia - and concresence

25. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The bud stage
The enamel organ is compressed
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

26. What are the formative cells for enamel?
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
Initiation
Ameloblasts
Dentin and alveolar bone

27. In the cap stage the tooth bud does not grow - what happens?
Differentiation - proliferation - morphogenesis
There is unequal growth in different parts of the tooth bud
Induction - proliferation
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

28. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
Apposition of the cementum
The enamel organ is compressed
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

29. What is microdontia?
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.
Abnormally small teeth
Dental tissues secreted as matrix in successive layers.
Dental follicle

30. What is another name for the dental sac?
Dental follicle
Abnormally large teeth
The ameloblasts
Union of 2 adjacent tooth germs

31. What will the dental sac give rise to?
When the gingiva recedes and no actual tooth movement takes place
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.
The cementum - PDL - and alveolar bone

32. What is the cap in the cap stage?
The enamel organ
Apposition of the cementum
Common with permanent maxillary molars
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

33. What hard tissue is innervated by nerves?
Cementoblasts
Dentin and alveolar bone
The ameloblasts
Hereditary

34. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The ectoderm
The basement membrane
Connective
Enamel pearl - enamel dysplasia - and concresence

35. 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
The enamel organ is compressed
Arrest and reversal lines
The cementum - PDL - and alveolar bone

36. What is dens in dente?
Initiation
Enamel organ invaginates into the dental papilla
The permanent molars
Sphere of enamel on root

37. What type of tissue is dentin - cementum - and alveolar bone?
As a result of the apposition of cementum over dentin
Connective
There are none - they are lost with eruption
Arrest and reversal lines

38. What is concrescence?
Odontogenesis
Union of root structure of two or more teeth by cementum
The ectomesenchyme
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

39. What else undergoes proliferation in the bud stage besides the dental lamina?
The ectomesenchyme
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Oral epithelium
Odontoclasts

40. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
Imbrication lines of von Ebner
Morphogenesis
Dental papilla

41. What are the clinical ramifications of dens in dente?
Bud stage
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
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

42. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Initiation stage
Dental tissues secreted as matrix in successive layers.
9th to 10th weeks

43. What happens during the bell stage?
Proliferation
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

44. Which teeth are nonsuccedaneous?
The permanent molars
Local or systemic or hereditary
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

45. What are the etiological factors for enamel pearl?
Cementoblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Displacement of ameloblasts to root surface
The ameloblasts

46. What is gemination?
Cementocytes
The outer enamel epithelium
Osteoblasts
Tooth germ tries to divide

47. When does the tooth bud become a tooth germ?
The stellate reticulum
In the cap stage
Cementocytes
Morphogenesis

48. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Osteoblasts
The ameloblasts
Dental papilla

49. What happens during the appositional stage?
Trauma - pressure or metabolic disease
The enamel - dentin - and cementum are secreted in successive layers
The basement membrane
Extra cusp due to effects on enamel organ

50. 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
Cementoblasts
The stellate reticulum
The basement membrane that seperates the enamel organ and dental papilla