Test your basic knowledge |

Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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. Where is the enamal organ originally derived from?
Ameloblasts
Differentiation
Union of root structure of two or more teeth by cementum
The ectoderm

2. Do odontoblasts start their secretion of matrix before the ameloblasts?
Odontogenesis
Cementocytes
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Differentiation - proliferation - morphogenesis

3. What are succedaneous teeth?
The enamel organ is compressed
The actual vertical movement of the tooth
The permanent molars
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

4. What are the mature cells for cementum?
When the gingiva recedes and no actual tooth movement takes place
Preameloblasts
Displacement of ameloblasts to root surface
Cementocytes

5. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Into odontoblasts
Induction

6. What are the clinical ramifications of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Development of one or more extra teeth
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Enamel

7. What are the formative cells for enamel?
Ameloblasts
The basement membrane
Tooth germ
Cementoblasts

8. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
The bud stage
Osteocytes
When the gingiva recedes and no actual tooth movement takes place

9. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The enamel organ
During the cap stage
Odontoblastic process
Differentiation

10. When does the process of root development take place?
Ameloblasts
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The bud stage
Dens in dente - gemination - tubercle - and fusion

11. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Union of 2 adjacent tooth germs
11th to 12th weeks
Cementoblasts
The ectoderm

12. What is the function of the Hertwig's epithelial root sheath?
The enamel organ
Traumatic injury or crowding of teeth
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

13. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Enamel organ
Apposition of the cementum
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Preameloblasts

14. What will the dental papilla eventually form?
A bilayer rim that consists only IEE and OEE
Faulty development of enamel from interference involving ameloblasts
Hereditary
Future dentin and pulp tissue

15. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The dental sac
Initiation stage
Cementocytes

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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

17. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Dental tissues secreted as matrix in successive layers.
Displacement of ameloblasts to root surface
Enamel secreting cells (ameloblasts)
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

18. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Union of 2 adjacent tooth germs
Initiation
Enamel pearl - enamel dysplasia - and concresence

19. What kind of cells occur in the inner enamel epithelium?
The ectomesenchyme - which was influenced by the neural crest cells
Tall columnar cells
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The basement membrane

20. What stage does supernumerary teeth occur?
Initiation
The primordium of the pulp
The apposition of the enamel matrix
As a result of the apposition of cementum over dentin

21. What is the time span for the cap stage?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Osteoblasts
Cementoblasts
9th to 10th weeks

22. What are the clinical ramifications of enamel pearl?
Cementocytes
Outer
May be confused as calculus deposit on root
Tooth germ tries to divide

23. What is concrescence?
Union of root structure of two or more teeth by cementum
Induction - proliferation
Outer
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

24. What hard tissue is can not have tissue formation after eruption?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The actual vertical movement of the tooth
Enamel

25. What is the embryological background for dentin - cementum and alveolar bone?
Odontogenesis
Dental papilla
Extra cusp due to effects on enamel organ
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

26. The stellate reticulum is located inner or outer?
Outer
6th to 7th weeks
Enamel pearl - enamel dysplasia - and concresence
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

27. What is the time span for the bell stage?
Cementoblasts
Dental papilla
Cementoblasts
11th to 12th weeks

28. What happens during the maturation stage?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Dental tissues fully mineralize to their mature levels.
The primordium of the pulp
Alveolar bone

29. What are the etiological factors for anodontia?
Initiation
Alveolar bone
Proliferation
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

30. What are the cell layers found in the enamel organ in the bell stage?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dens in dente - gemination - tubercle - and fusion
The ectomesenchyme - which was influenced by the neural crest cells

31. In the cap stage the tooth bud does not grow - what happens?
As a result of the apposition of cementum over dentin
The basement membrane
It disintegrates as the developing oral mucosa comes to line the oral cavity
There is unequal growth in different parts of the tooth bud

32. What hard tissue is innervated by nerves?
Induction - proliferation
Induction
Imbrication lines of von Ebner
Dentin and alveolar bone

33. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Differentiation
Odontoblastic process
Hereditary in localized form. endocrine dysfunction is complete

34. What are the development disturbances of the apposition and maturation stages?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Enamel pearl - enamel dysplasia - and concresence
During the cap stage

35. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Hereditary
The outer cells of the dental papilla and the central cells of the dental papilla
There are none - they are lost with eruption
Dental tissues secreted as matrix in successive layers.

36. What stage does the dental tissues subsequently fully mineralize
There are none - they are lost with eruption
Inner
As a result of the apposition of cementum over dentin
Maturation

37. What happens during the cap stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The ameloblasts place an acellular dental cuticle on the new enamel surface
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
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.

38. What is the main process involved in initiation?
Cementocytes
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Induction
Odontoblastic process

39. What will the dental sac give rise to?
There are none - they are lost with eruption
The cementum - PDL - and alveolar bone
Hereditary
Sphere of enamel on root

40. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
Enamel organ invaginates into the dental papilla
The cementum - PDL - and alveolar bone
The actual vertical movement of the tooth

41. What is the cementum matrix called?
Local or systemic or hereditary
The cementum - PDL - and alveolar bone
Cementocytes
Cementoid

42. What is tubercle?
Compressed layer of flat to cuboidal cells
Outer
Extra cusp due to effects on enamel organ
Initiation stage

43. What are the etiological factors of tubercle?
The permanent molars
Proliferation - differentiation - morphogenesis
Trauma - pressure or metabolic disease
Enamel secreting cells (ameloblasts)

44. What are entrapped cementoblasts called?
Apposition of the cementum
The enamel organ - dental papilla - dental sac
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
Cementocytes

45. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The basement membrane
Dental papilla
Cementoid

46. What are the mature cells for alveolar bone?
The ectomesenchyme
Epithelial rests of Malassez
Osteocytes
Hereditary

47. What are the clinical ramifications of micro/macrodontia?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Odontoclasts
Future dentin and pulp tissue
Commonly involves permanent maxillary lateral incisor and 3rd molars

48. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
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
The ameloblasts place an acellular dental cuticle on the new enamel surface
The actual vertical movement of the tooth

49. When does dens in dente occur?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
During the cap stage
Lines of Retzuis
Epithelial

50. Where is the dental papilla originally derived from?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Extra cusp due to effects on enamel organ
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 ectomesenchyme - which was influenced by the neural crest cells