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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 incremental lines for dentin?
Dental papilla
Future dentin and pulp tissue
Odontoblastic process
Imbrication lines of von Ebner

2. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The dental lamina
Cementoid
Absence of single or multiple teeth

3. What is the predominate process of 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
Morphogenesis
Cementocytes

4. What processes are involved in the bell stage?
Dental tissues secreted as matrix in successive layers.
Differentiation - proliferation - morphogenesis
The primordium of the pulp
Odontogenesis

5. What is an enamel pearl?
Initiation
The stellate reticulum
Dental follicle
Sphere of enamel on root

6. What are supernumerary teeth?
Development of one or more extra teeth
Extra cusp due to effects on enamel organ
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
May be confused as calculus deposit on root

7. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Union of root structure of two or more teeth by cementum
Apposition of the cementum
Tooth germ
The basement membrane that seperates the enamel organ and dental papilla

8. What is the cementum matrix called?
The enamel organ - dental papilla - dental sac
The apposition of the enamel matrix
Cementoid
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

9. What is gemination?
Tooth germ tries to divide
Union of root structure of two or more teeth by cementum
Hereditary
The ectoderm

10. What is the embryological background for dentin - cementum and alveolar bone?
The basement membrane
Dental papilla
Imbrication lines of von Ebner
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

11. When does dens in dente occur?
During the cap stage
4 types
Osteocytes
Common with permanent maxillary molars

12. What happens during the apposition stage?
In the cap stage
Dental tissues secreted as matrix in successive layers.
Oral epithelium
The ameloblasts

13. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Cementoblasts
Hereditary
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

14. What is the process involved in the maturation stage?
Trauma - pressure or metabolic disease
Maturation
Hereditary in localized form. endocrine dysfunction is complete
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

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
Odontoclasts
Hereditary
Dentin and alveolar bone

16. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Induction
There is unequal growth in different parts of the tooth bud
Displacement of ameloblasts to root surface

17. What is another name for the dental sac?
Hereditary
Dental follicle
4 types
Preameloblasts

18. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The ectomesenchyme - which was influenced by the neural crest cells
Odontoblastic process
Tooth germ
Maturation

19. What is dens in dente?
The apposition of the enamel matrix
Enamel organ invaginates into the dental papilla
Epithelial rests of Malassez
Local or systemic or hereditary

20. What are the clinical ramifications of enamel dysplasia?
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
Bud stage
8th week
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

21. What does the cervical loop consist of?
Odontoclasts
A bilayer rim that consists only IEE and OEE
Dental papilla
Epithelial

22. What is enamel dysplasia?
Oral epithelium
Ameloblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Faulty development of enamel from interference involving ameloblasts

23. The oral epithelium is induced by the ectomesenchyme to produce what?
9th to 10th weeks
The ameloblasts
Compressed layer of flat to cuboidal cells
The dental lamina

24. What are the mature cells for enamel?
Common with permanent maxillary molars
The apposition of the enamel matrix
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
There are none - they are lost with eruption

25. How is the reduced enamel epithelium created?
The enamel organ is compressed
Local or systemic or 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
Tooth germ

26. What hard tissue is can not have tissue formation after eruption?
Enamel
Dental tissues fully mineralize to their mature levels.
4 types
Abnormally large teeth

27. What kind of cells occur in the inner enamel epithelium?
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 ectoderm
Alveolar bone
Tall columnar cells

28. When does macro/microdontia occur?
Future dentin and pulp tissue
Bud stage
Outer
The ameloblasts

29. What are the clinical ramifications of enamel pearl?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Induction - proliferation
The actual vertical movement of the tooth
May be confused as calculus deposit on root

30. What is the function of the Hertwig's epithelial root sheath?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
8th week
Enamel secreting cells (ameloblasts)
Morphogenesis

31. What are the cell layers found in the enamel organ in the bell stage?
Induction - proliferation
Common on permanent molars or cingulum of anterior teeth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The primordium of the pulp

32. What will the inner cells of the dental lamina differentiates into?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Dental papilla
Bud stage
The primordium of the pulp

33. Where is the dental sac originally derived from?
The ectomesenchyme
The basement membrane
Common with permanent maxillary molars
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

34. What are the major components of the tooth germ?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Absence of single or multiple teeth
The enamel organ - dental papilla - dental sac

35. What is the time span for initiation?
Odontoblasts
6th to 7th weeks
Dental tissues secreted as matrix in successive layers.
Enamel

36. What are the etiological factors of tubercle?
Dens in dente - gemination - tubercle - and fusion
The bud stage
Trauma - pressure or metabolic disease
The outer enamel epithelium

37. What happens during initiation?
Proliferation - differentiation - morphogenesis
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Induction
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

38. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Apposition of the cementum
Differentiation
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

39. What is anodontia?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Induction - proliferation
Differentiation - proliferation - morphogenesis
Absence of single or multiple teeth

40. What happens during the bell stage?
Hereditary
Maturation
Bud stage
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

41. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Sphere of enamel on root
The basement membrane
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

42. What stage does the dental tissues subsequently fully mineralize
Maturation
Differentiation
Ameloblasts
The cementum - PDL - and alveolar bone

43. What are the mature cells for alveolar bone?
Odontoclasts
Osteocytes
The actual vertical movement of the tooth
It disintegrates as the developing oral mucosa comes to line the oral cavity

44. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The basement membrane that seperates the enamel organ and dental papilla
The ectomesenchyme - which was influenced by the neural crest cells
The dental sac
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

45. Do odontoblasts start their secretion of matrix before the ameloblasts?
There are none - they are lost with eruption
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Enamel secreting cells (ameloblasts)
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

46. Where does the primordium of the permanent dentition develop?
The bud stage
Lines of Retzuis
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

47. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The basement membrane that seperates the enamel organ and dental papilla
The apposition of the enamel matrix
The dental lamina

48. What is concrescence?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The dental lamina
Union of root structure of two or more teeth by cementum
May be confused as calculus deposit on root

49. What type of tissue is dentin - cementum - and alveolar bone?
Proliferation - differentiation - morphogenesis
The basement membrane
Connective
Pressure on the area

50. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Abnormally small teeth
Differentiation - proliferation - morphogenesis