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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. Which teeth are nonsuccedaneous?
Osteocytes
Cementoid
The bud stage
The permanent molars

2. Active eruption
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The actual vertical movement of the tooth
During the cap stage
Alveolar bone

3. What is the time span for the bell stage?
Oral epithelium
Apposition of the cementum
The ameloblasts place an acellular dental cuticle on the new enamel surface
11th to 12th weeks

4. What are the incremental lines for cementum and alveolar bone?
Common on permanent molars or cingulum of anterior teeth
Tall columnar cells
Tooth germ tries to divide
Arrest and reversal lines

5. What are the etiological factors of tubercle?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Enamel
Trauma - pressure or metabolic disease

6. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
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

7. What are the clinical ramifications of enamel dysplasia?
Epithelial
The ameloblasts
The basement membrane that seperates the enamel organ and dental papilla
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

8. In the cap stage the tooth bud does not grow - what happens?
The primordium of the pulp
The basement membrane that seperates the enamel organ and dental papilla
Enamel organ invaginates into the dental papilla
There is unequal growth in different parts of the tooth bud

9. What type of tissue is dentin - cementum - and alveolar bone?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The dental lamina
Connective
Maturation

10. What kind of cells occur in the inner enamel epithelium?
Dentin secreting cells (odontoblats)
May be confused as calculus deposit on root
Outer
Tall columnar cells

11. What is the main process involved in initiation?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Induction
Trauma - pressure or metabolic disease
Odontoblasts

12. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
Pressure on the area
The actual vertical movement of the tooth
The primordium of the pulp

13. What are the clinical ramifications of anodontia?
Sphere of enamel on root
The basement membrane that seperates the enamel organ and dental papilla
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Cementocytes

14. What happens during the apposition stage?
Enamel organ invaginates into the dental papilla
Dental tissues secreted as matrix in successive layers.
Dental tissues fully mineralize to their mature levels.
In the cap stage

15. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Hereditary
The basement membrane that seperates the enamel organ and dental papilla

16. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
Hereditary
Lines of Retzuis
The ectoderm

17. What do the odontoblasts do?
Cementocytes
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Odontoblastic process
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

18. What wll the inner enamel epithelium differentiate into?
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 secreting cells (ameloblasts)
Dental tissues fully mineralize to their mature levels.
Trauma - pressure or metabolic disease

19. What is an enamel pearl?
The enamel - dentin - and cementum are secreted in successive layers
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
As a result of the apposition of cementum over dentin
Sphere of enamel on root

20. What is concrescence?
Outer
Union of root structure of two or more teeth by cementum
Cuboidal cells
Abnormally small teeth

21. The stratum intermediate is located inner or outer?
Inner
The outer enamel epithelium
Tooth germ tries to divide
Pressure on the area

22. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The outer cells of the dental papilla and the central cells of the dental papilla
Enamel
The basement membrane
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

23. The stellate reticulum is located inner or outer?
Outer
Displacement of ameloblasts to root surface
Extra cusp due to effects on enamel organ
6th to 7th weeks

24. When does macro/microdontia occur?
Ameloblasts
Trauma - pressure or metabolic disease
Dental papilla
Bud stage

25. What are the clinical ramifications of dens in dente?
The basement membrane
Cementocytes
Union of root structure of two or more teeth by cementum
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

26. What are the developmental disturbances of the cap stage?
Only dentinal tubules with processes
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dens in dente - gemination - tubercle - and fusion
Abnormally large teeth

27. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
Union of 2 adjacent tooth germs
Sphere of enamel on root
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

28. What will the inner cells of the dental lamina differentiates into?
Epithelial rests of Malassez
Proliferation - differentiation - morphogenesis
The primordium of the pulp
Bud stage

29. What will the dental papilla eventually form?
Enamel organ
The ameloblasts place an acellular dental cuticle on the new enamel surface
Future dentin and pulp tissue
Inner

30. What are the etiological factors for dens in dente and gemination?
The dental sac
Hereditary in localized form. endocrine dysfunction is complete
Hereditary
Common on permanent molars or cingulum of anterior teeth

31. What is the predominate process in the bell stage?
Differentiation
Lines of Retzuis
Common with permanent maxillary molars
Cementoid

32. What are the formative cells for dentin?
Odontoclasts
Tall columnar cells
Odontoblasts
Sphere of enamel on root

33. What are the odontoblastic processes is contained in what?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Enamel organ
There is unequal growth in different parts of the tooth bud
A mineralized cylinder - the dentinal tubule

34. What is macrodontia?
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 enamel organ is compressed
Dens in dente - gemination - tubercle - and fusion
Abnormally large teeth

35. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
A mineralized cylinder - the dentinal tubule
The ectomesenchyme
Dentin secreting cells (odontoblats)
Odontoblastic process

36. What stage does anodontia occur?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Initiation stage
Odontoclasts
Dental papilla

37. Which layer in the bell stage has star shaped cells?
The stellate reticulum
When the gingiva recedes and no actual tooth movement takes place
May be confused as calculus deposit on root
Traumatic injury or crowding of teeth

38. How many types of cells are found in the enamel organ in the bell stage?
Dental tissues secreted as matrix in successive layers.
The bud stage
4 types
Inner

39. What are the formative cells for enamel?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Ameloblasts
Apposition of the cementum
Osteoblasts

40. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
During the cap stage
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

41. What stage does the dental tissues subsequently fully mineralize
Cuboidal cells
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Maturation
Lines of Retzuis

42. What is the time span for the bud stage?
Local or systemic or hereditary
Initiation
8th week
Osteoblasts

43. Do odontoblasts start their secretion of matrix before the ameloblasts?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The basement membrane that seperates the enamel organ and dental papilla
Common on permanent molars or cingulum of anterior teeth
Osteocytes

44. What is the structure responsible for root development?
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 cervical loop
Differentiation
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 causes the induction of the preameloblasts to differentiate into ameloblasts?
The enamel - dentin - and cementum are secreted in successive layers
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Osteocytes
Displacement of ameloblasts to root surface

46. What type of tissue is enamel?
Cementocytes
The outer cells of the dental papilla and the central cells of the dental papilla
Epithelial
The ectomesenchyme

47. What is the time span for the cap stage?
9th to 10th weeks
Union of 2 adjacent tooth germs
Outer
Alveolar bone

48. What does the cervical loop consist of?
Displacement of ameloblasts to root surface
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
A bilayer rim that consists only IEE and OEE
The actual vertical movement of the tooth

49. What is cementogenisis?
Local or systemic or hereditary
Apposition of the cementum
Dentin and alveolar bone
Initiation stage

50. What are the mature cells for enamel?
Inner
May be confused as calculus deposit on root
There are none - they are lost with eruption
Hereditary