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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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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What are the clinical ramifications?
Union of root structure of two or more teeth by cementum
Common on permanent molars or cingulum of anterior teeth
The enamel organ
Ameloblasts

2. What wll the inner enamel epithelium differentiate into?
Tooth germ tries to divide
Dental follicle
Dens in dente - gemination - tubercle - and fusion
Enamel secreting cells (ameloblasts)

3. In the cap stage the tooth bud does not grow - what happens?
It disintegrates as the developing oral mucosa comes to line the oral cavity
There is unequal growth in different parts of the tooth bud
Cementoblasts
Osteoblasts

4. What are the clinical ramifications of fusion?
Dental tissues secreted as matrix in successive layers.
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

5. What is the cementum matrix called?
9th to 10th weeks
Dental tissues fully mineralize to their mature levels.
Cementoid
Initiation stage

6. What is the outer portion of the ectoderm in the initiation stage?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The ectomesenchyme
The ectomesenchyme - which was influenced by the neural crest cells
Oral epithelium

7. What will the dental sac give rise to?
Sphere of enamel on root
The cementum - PDL - and alveolar bone
Enamel pearl - enamel dysplasia - and concresence
Common on permanent molars or cingulum of anterior teeth

8. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
The outer cells of the dental papilla and the central cells of the dental papilla
The ectomesenchyme
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

9. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Enamel
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
Dentin and alveolar bone
The ameloblasts place an acellular dental cuticle on the new enamel surface

10. What happens during the apposition stage?
Odontoblasts
Dental tissues secreted as matrix in successive layers.
The enamel organ is compressed
Dens in dente - gemination - tubercle - and fusion

11. What are the etiological factors for dens in dente and gemination?
Tooth germ
Hereditary
The ameloblasts place an acellular dental cuticle on the new enamel surface
Odontogenesis

12. What hard tissue has vascularity?
Absence of single or multiple teeth
Alveolar bone
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
There are none - they are lost with eruption

13. What are the clinical ramifications of micro/macrodontia?
Common with permanent maxillary molars
Commonly involves permanent maxillary lateral incisor and 3rd molars
Displacement of ameloblasts to root surface
Trauma - pressure or metabolic disease

14. What is the main process involved in the bud stage?
The outer enamel epithelium
Inner
Proliferation
Alveolar bone

15. What stage does anodontia occur?
The ameloblasts
Differentiation - proliferation - morphogenesis
Dental papilla
Initiation stage

16. When does the tooth bud become a tooth germ?
Alveolar bone
Future dentin and pulp tissue
The apposition of the enamel matrix
In the cap stage

17. What is amelogenisis?
8th week
The apposition of the enamel matrix
May be confused as calculus deposit on root
Faulty development of enamel from interference involving ameloblasts

18. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Maturation
Local or systemic or hereditary
Odontoblasts

19. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
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
Arrest and reversal lines

20. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
The ectoderm
There is unequal growth in different parts of the tooth bud
When the gingiva recedes and no actual tooth movement takes place

21. When does dens in dente occur?
Union of 2 adjacent tooth germs
During the cap stage
The dental sac
The stellate reticulum

22. What will the outer cells of the dental lamina differentiate into?
The enamel organ - dental papilla - dental sac
Odontoblasts
Dentin secreting cells (odontoblats)
Hereditary

23. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
There is unequal growth in different parts of the tooth bud
Commonly involves permanent maxillary lateral incisor and 3rd molars
Inner

24. What are the incremental lines for cementum and alveolar bone?
Epithelial
Arrest and reversal lines
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
There are none - they are lost with eruption

25. What is concrescence?
There is unequal growth in different parts of the tooth bud
The basement membrane that seperates the enamel organ and dental papilla
Union of root structure of two or more teeth by cementum
Imbrication lines of von Ebner

26. What is the cap in the cap stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The enamel organ
The outer enamel epithelium

27. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Dentin and alveolar bone
The dental lamina
Tooth germ tries to divide
Tooth germ

28. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
A bilayer rim that consists only IEE and OEE
Dental papilla
Sphere of enamel on root
The enamel organ

29. What is the predominate process of the cap stage?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Morphogenesis
Cementoblasts
The ectomesenchyme

30. What kind of cells occur in the outer enamel epithelium in the bell stage?
Cementocytes
9th to 10th weeks
The basement membrane
Cuboidal cells

31. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Cementocytes
4 types

32. The stratum intermediate is located inner or outer?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Abnormally small teeth
Enamel secreting cells (ameloblasts)
Inner

33. What are succedaneous teeth?
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.
Enamel pearl - enamel dysplasia - and concresence
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Inner

34. What happens during the cap stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
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 Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Induction - proliferation

35. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Apposition of the cementum
Hereditary
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 ameloblasts

36. What is the structure responsible for root development?
Displacement of ameloblasts to root surface
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Into odontoblasts
The cervical loop

37. What is dens in dente?
The basement membrane that seperates the enamel organ and dental papilla
A bilayer rim that consists only IEE and OEE
Development of one or more extra teeth
Enamel organ invaginates into the dental papilla

38. Which layer in the bell stage has star shaped cells?
Hereditary in localized form. endocrine dysfunction is complete
Arrest and reversal lines
Proliferation - differentiation - morphogenesis
The stellate reticulum

39. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Local or systemic or hereditary
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

40. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
The enamel organ
The enamel organ - dental papilla - dental sac
The ectomesenchyme

41. The stellate reticulum is located inner or outer?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Outer
Epithelial
The dental lamina

42. Which teeth are nonsuccedaneous?
4 types
Hereditary
The permanent molars
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

43. What happens to the thickened non tooth producing portions of the dental lamina eventually?
The ectoderm
It disintegrates as the developing oral mucosa comes to line the oral cavity
Tooth germ
Abnormally large teeth

44. What are the mature cells for 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
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Osteocytes
Epithelial

45. When does macro/microdontia occur?
The enamel - dentin - and cementum are secreted in successive layers
Epithelial rests of Malassez
Tall columnar cells
Bud stage

46. Where is the dental sac originally derived from?
4 types
The ectomesenchyme
When the gingiva recedes and no actual tooth movement takes place
Tall columnar cells

47. What are the formative cells for dentin?
Cementoblasts
Odontoblasts
The ectomesenchyme
Into odontoblasts

48. Where does the primordium of the permanent dentition develop?
Initiation stage
Local or systemic or hereditary
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ectomesenchyme - which was influenced by the neural crest cells

49. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The primordium of the pulp
Cementoblasts

50. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
4 types
Odontoclasts
Displacement of ameloblasts to root surface
The tooth germ