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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 enamel dysplasia?
Common on permanent molars or cingulum of anterior teeth
Union of root structure of two or more teeth by cementum
Dentin and alveolar bone
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

2. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
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 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

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

4. What will the dental sac give rise to?
Outer
The cementum - PDL - and alveolar bone
The actual vertical movement of the tooth
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

5. What is the time span for the bell stage?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Induction
11th to 12th weeks

6. What layer serves as protection for the enamel organ?
May be confused as calculus deposit on root
The outer enamel epithelium
Bud stage
6th to 7th weeks

7. What are the clinical ramifications of concrescence?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Differentiation - proliferation - morphogenesis
Common with permanent maxillary molars
Hereditary

8. What is the main process involved in the bud stage?
There is unequal growth in different parts of the tooth bud
Hereditary
Proliferation
The basement membrane that seperates the enamel organ and dental papilla

9. What is the function of the Hertwig's epithelial root sheath?
Proliferation
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Commonly involves permanent maxillary lateral incisor and 3rd molars
The basement membrane

10. Which teeth are nonsuccedaneous?
The permanent molars
Epithelial rests of Malassez
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Abnormally small teeth

11. Passive eruption
During the cap stage
When the gingiva recedes and no actual tooth movement takes place
Lines of Retzuis
Cementocytes

12. What stage does supernumerary teeth occur?
Hereditary
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
When the gingiva recedes and no actual tooth movement takes place
Initiation

13. What is fusion?
Morphogenesis
Union of 2 adjacent tooth germs
The basement membrane
Initiation

14. What are the clinical ramifications of micro/macrodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The basement membrane
Commonly involves permanent maxillary lateral incisor and 3rd molars
Bud stage

15. What is concrescence?
Union of root structure of two or more teeth by cementum
Lines of Retzuis
Maturation
It disintegrates as the developing oral mucosa comes to line the oral cavity

16. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
Arrest and reversal lines
Epithelial
Odontogenesis

17. What is microdontia?
Dental tissues secreted as matrix in successive layers.
Abnormally small teeth
The actual vertical movement of the tooth
Enamel organ invaginates into the dental papilla

18. What is the cap in the cap stage?
Common on permanent molars or cingulum of anterior teeth
Displacement of ameloblasts to root surface
The enamel organ
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

19. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
The cervical loop
The outer cells of the dental papilla and the central cells of the dental papilla
Hereditary in localized form. endocrine dysfunction is complete

20. What are the mature cells for dentin?
Enamel pearl - enamel dysplasia - and concresence
Abnormally small teeth
Only dentinal tubules with processes
There is unequal growth in different parts of the tooth bud

21. What are the clinical ramifications of supernumerary teeth?
Epithelial rests of Malassez
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
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 basement membrane

22. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
It disintegrates as the developing oral mucosa comes to line the oral cavity
The cementum - PDL - and alveolar bone
The enamel - dentin - and cementum are secreted in successive layers

23. What will the outer cells of the dental lamina differentiate into?
Bud stage
Odontoclasts
Dentin secreting cells (odontoblats)
Dentin and alveolar bone

24. What is the embryological background for enamel?
The stellate reticulum
Dental papilla
Enamel organ
Cementoid

25. What are the clinical ramifications of gemination?

26. What are the clinical ramifications of anodontia?
Dental papilla
Bud stage
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
When the gingiva recedes and no actual tooth movement takes place

27. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
9th to 10th weeks
The enamel organ
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

28. What are the mature cells for alveolar bone?
Osteocytes
Proliferation
The stellate reticulum
The ameloblasts

29. How is the reduced enamel epithelium created?
Tall columnar cells
The enamel organ is compressed
Initiation stage
Outer

30. 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 follicle
The enamel - dentin - and cementum are secreted in successive layers
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

31. What is the embryological background for dentin - cementum and alveolar bone?
The basement membrane
Development of one or more extra teeth
Displacement of ameloblasts to root surface
Dental papilla

32. What is the site for the future dentioenamel junction?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The basement membrane that seperates the enamel organ and dental papilla
Common with permanent maxillary molars
Dental tissues fully mineralize to their mature levels.

33. What happens to the thickened non tooth producing portions of the dental lamina eventually?
The actual vertical movement of the tooth
It disintegrates as the developing oral mucosa comes to line the oral cavity
Enamel secreting cells (ameloblasts)
Cuboidal cells

34. What are the formative cells for cementum?
Dental papilla
Cementoblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dentin secreting cells (odontoblats)

35. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
8th week
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Tooth germ
Future dentin and pulp tissue

36. What are the etiological factors for anodontia?
The basement membrane that seperates the enamel organ and dental papilla
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
8th week
Maturation

37. What are the etiological factors of enamel dysplasia?
The ameloblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Odontoblastic process
Local or systemic or hereditary

38. What is the predominate process in the bell stage?
Osteocytes
Dentin and alveolar bone
Differentiation
Development of one or more extra teeth

39. What will the dental papilla eventually form?
Induction
Tall columnar cells
Future dentin and pulp tissue
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

40. Tooth development
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Enamel secreting cells (ameloblasts)
Tooth germ tries to divide
Odontogenesis

41. What happens when the reduced enamel epithelium is created?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The ectomesenchyme - which was influenced by the neural crest cells
Dentin secreting cells (odontoblats)
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

42. What is an enamel pearl?
The stellate reticulum
Dentin secreting cells (odontoblats)
Sphere of enamel on root
Odontoclasts

43. What happens during the cap stage?
Oral epithelium
Osteoblasts
Induction - proliferation
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.

44. What are the mature cells for enamel?
Osteoblasts
The ectomesenchyme
Dental tissues secreted as matrix in successive layers.
There are none - they are lost with eruption

45. What are the formative cells for enamel?
Ameloblasts
Hereditary
Epithelial
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

46. What are the clinical ramifications of dens in dente?
The enamel organ is compressed
Epithelial rests of Malassez
There is unequal growth in different parts of the tooth bud
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

47. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
Enamel organ
The ectomesenchyme
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

48. What is the outer portion of the ectoderm in the initiation stage?
Hereditary
Cuboidal cells
Oral epithelium
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

49. 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 outer cells of the dental papilla and the central cells of 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.
Union of root structure of two or more teeth by cementum

50. What is the predominate process of the cap stage?
Morphogenesis
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The ameloblasts place an acellular dental cuticle on the new enamel surface
The stellate reticulum