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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 stage does anodontia occur?
Lines of Retzuis
Enamel organ
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

2. What are the development disturbances of the apposition and maturation stages?
4 types
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

3. What are entrapped cementoblasts called?
Cementocytes
Extra cusp due to effects on enamel organ
Osteocytes
Morphogenesis

4. What processes are involved with the apposition stage?
Induction - proliferation
The dental lamina
Cementocytes
Absence of single or multiple teeth

5. What will the dental papilla eventually form?
Dental tissues secreted as matrix in successive layers.
Future dentin and pulp tissue
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
Enamel

6. What is the primordium of the tooth?
The actual vertical movement of the tooth
Hereditary
Inner
The tooth germ

7. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
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.
6th to 7th weeks
Cementoid

8. What hard tissue has vascularity?
A mineralized cylinder - the dentinal tubule
Alveolar bone
Dentin secreting cells (odontoblats)
Initiation

9. What is anodontia?
Hereditary
Absence of single or multiple teeth
Odontoclasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

10. What are the formative cells for alveolar bone?
Osteoblasts
Enamel organ
Ameloblasts
Union of root structure of two or more teeth by cementum

11. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
Alveolar bone
Future dentin and pulp tissue
Tooth germ tries to divide

12. What are the clinical ramifications of enamel pearl?
Tall columnar cells
Odontoblastic process
Maturation
May be confused as calculus deposit on root

13. Where is the enamal organ originally derived from?
The ectoderm
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
4 types
The dental sac

14. What is the predominate process of the cap stage?
Dens in dente - gemination - tubercle - and fusion
Morphogenesis
The dental sac
During the cap stage

15. When does dens in dente occur?
During the cap stage
Proliferation
Dental tissues secreted as matrix in successive layers.
Cementoid

16. What else undergoes proliferation in the bud stage besides the dental lamina?
The basement membrane that seperates the enamel organ and dental papilla
9th to 10th weeks
The ectomesenchyme
Hereditary in localized form. endocrine dysfunction is complete

17. What are the clinical ramifications of concrescence?
9th to 10th weeks
Common with permanent maxillary molars
The ectomesenchyme - which was influenced by the neural crest cells
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

18. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The bud stage
Dentin and alveolar bone
Tooth germ
Pressure on the area

19. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
Apposition of the cementum
In the cap stage
Arrest and reversal lines

20. What type of tissue is dentin - cementum - and alveolar bone?
Maturation
Connective
Dentin and alveolar bone
The tooth germ

21. Where is the dental sac originally derived from?
Odontoblasts
The ectomesenchyme
Cementoblasts
Differentiation

22. What are the clinical ramifications?
Faulty development of enamel from interference involving ameloblasts
Common on permanent molars or cingulum of anterior teeth
The cervical loop
11th to 12th weeks

23. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
A mineralized cylinder - the dentinal tubule
The bud stage
Trauma - pressure or metabolic disease
Only dentinal tubules with processes

24. What kind of cells occur in the outer enamel epithelium in the bell stage?
Maturation
Future dentin and pulp tissue
Cuboidal cells
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

25. Do odontoblasts start their secretion of matrix before the ameloblasts?
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
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dental tissues fully mineralize to their mature levels.
The ameloblasts place an acellular dental cuticle on the new enamel surface

26. What are the etiological factors for dens in dente and gemination?
Hereditary
The enamel - dentin - and cementum are secreted in successive layers
Cementocytes
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

27. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Abnormally small teeth
Odontoblastic process
Preameloblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface

28. What is the embryological background for dentin - cementum and 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
The basement membrane that seperates the enamel organ and dental papilla
Dental papilla
There is unequal growth in different parts of the tooth bud

29. What are the mature cells for dentin?
Only dentinal tubules with processes
Sphere of enamel on root
Lines of Retzuis
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

30. What wll the inner enamel epithelium differentiate into?
Induction - proliferation
Enamel secreting cells (ameloblasts)
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

31. What is concrescence?
The basement membrane
Displacement of ameloblasts to root surface
Union of root structure of two or more teeth by cementum
Dental papilla

32. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
It disintegrates as the developing oral mucosa comes to line the oral cavity
Osteoblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

33. What are the mature cells for cementum?
Preameloblasts
Cementocytes
The basement membrane
Sphere of enamel on root

34. What happens during the bell stage?
Tall columnar cells
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Morphogenesis

35. What is the main process involved in initiation?
Apposition of the cementum
The basement membrane that seperates the enamel organ and dental papilla
Induction
Bud stage

36. What are the clinical ramifications of dens in dente?
The ectomesenchyme
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Tooth germ
Enamel pearl - enamel dysplasia - and concresence

37. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Absence of single or multiple teeth
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
When the gingiva recedes and no actual tooth movement takes place
It disintegrates as the developing oral mucosa comes to line the oral cavity

38. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Odontoclasts
Hereditary
Dental tissues secreted as matrix in successive layers.

39. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Proliferation
Lines of Retzuis
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The ameloblasts

40. What are the etiological factors of tubercle?
The outer cells of the dental papilla and the central cells of the dental papilla
Trauma - pressure or metabolic disease
Enamel secreting cells (ameloblasts)
Induction

41. What are succedaneous teeth?
Proliferation - differentiation - morphogenesis
Induction - proliferation
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The stellate reticulum

42. What happens during the apposition stage?
Tooth germ tries to divide
Connective
Dental tissues secreted as matrix in successive layers.
As a result of the apposition of cementum over dentin

43. What is the time span for the cap stage?
9th to 10th weeks
Common on permanent molars or cingulum of anterior teeth
Common with permanent maxillary molars
Enamel organ invaginates into the dental papilla

44. How many types of cells are found in the enamel organ in the bell stage?
Connective
4 types
Commonly involves permanent maxillary lateral incisor and 3rd molars
It disintegrates as the developing oral mucosa comes to line the oral cavity

45. What happens when the reduced enamel epithelium is created?
Cementocytes
Into odontoblasts
Apposition of the cementum
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

46. What is the predominate process in the bell stage?
The dental sac
Differentiation
Lines of Retzuis
Common on permanent molars or cingulum of anterior teeth

47. What is the function of the Hertwig's epithelial root sheath?
The ectomesenchyme
Pressure on the area
Alveolar bone
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

48. What is the process involved in the maturation stage?
Osteoblasts
Maturation
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The outer cells of the dental papilla and the central cells of the dental papilla

49. What are the odontoblastic processes is contained in what?
In the cap stage
A mineralized cylinder - the dentinal tubule
Odontogenesis
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

50. What happens during the appositional stage?
Displacement of ameloblasts to root surface
The enamel - dentin - and cementum are secreted in successive layers
Enamel organ invaginates into the dental papilla
Proliferation