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. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
The dental lamina
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
Hereditary in localized form. endocrine dysfunction is complete

2. What is the predominate process of the cap stage?
Common on permanent molars or cingulum of anterior teeth
Absence of single or multiple teeth
Hereditary
Morphogenesis

3. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
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
Tooth germ

4. What are the clinical ramifications of gemination?

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

5. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Odontoclasts
Arrest and reversal lines
Odontogenesis
Epithelial rests of Malassez

6. What is the main process involved in initiation?
Differentiation
Proliferation - differentiation - morphogenesis
Preameloblasts
Induction

7. What are the etiological factors for fusion?
Initiation
Pressure on the area
Cementoblasts
Common on permanent molars or cingulum of anterior teeth

8. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The basement membrane
The cementum - PDL - and alveolar bone
Initiation stage
The bud stage

9. What hard tissue is innervated by nerves?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dentin and alveolar bone
The ameloblasts place an acellular dental cuticle on the new enamel surface
Enamel

10. What is the time span for the cap stage?
Faulty development of enamel from interference involving ameloblasts
9th to 10th weeks
The enamel - dentin - and cementum are secreted in successive layers
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

11. What are the formative cells for cementum?
9th to 10th weeks
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Cementoblasts
Proliferation

12. What is enamel dysplasia?
Enamel
Faulty development of enamel from interference involving ameloblasts
Union of 2 adjacent tooth germs
Tall columnar cells

13. What type of tissue is dentin - cementum - and alveolar bone?
Connective
A mineralized cylinder - the dentinal tubule
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
Dental papilla

14. What are the formative cells for dentin?
Odontoclasts
Commonly involves permanent maxillary lateral incisor and 3rd molars
The ectomesenchyme - which was influenced by the neural crest cells
Odontoblasts

15. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ectomesenchyme - which was influenced by the neural crest cells
The ameloblasts place an acellular dental cuticle on the new enamel surface
Trauma - pressure or metabolic disease
Differentiation - proliferation - morphogenesis

16. What hard tissue is can not have tissue formation after eruption?
Enamel
Dentin and alveolar bone
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Union of root structure of two or more teeth by cementum

17. What are the clinical ramifications of dens in dente?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Preameloblasts
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

18. What will the inner cells of the dental lamina differentiates into?
Pressure on the area
It disintegrates as the developing oral mucosa comes to line the oral cavity
The primordium of the pulp
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

19. What is the main process involved in the bud stage?
Proliferation
Preameloblasts
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 basement membrane

20. What is concrescence?
In the cap stage
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Union of root structure of two or more teeth by cementum
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

21. What kind of cells occur in the inner enamel epithelium?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The basement membrane
Tall columnar cells

22. Tooth development
Dental papilla
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Pressure on the area
Odontogenesis

23. What is the site for the future dentioenamel junction?
When the gingiva recedes and no actual tooth movement takes place
The basement membrane that seperates the enamel organ and dental papilla
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The enamel organ

24. What is amelogenisis?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The apposition of the enamel matrix
11th to 12th weeks
The ameloblasts place an acellular dental cuticle on the new enamel surface

25. What is the time span for initiation?
6th to 7th weeks
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Maturation
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

26. What kind of cells occur in the outer enamel epithelium in the bell stage?
Cuboidal cells
Connective
Osteoblasts
There is unequal growth in different parts of the tooth bud

27. What do the odontoblasts do?
There is unequal growth in different parts of the tooth bud
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Abnormally large teeth
The ectomesenchyme - which was influenced by the neural crest cells

28. What processes are involved with the apposition stage?
Only dentinal tubules with processes
Induction - proliferation
The ectomesenchyme - which was influenced by the neural crest cells
The ectomesenchyme

29. What else undergoes proliferation in the bud stage besides the dental lamina?
Into odontoblasts
The ectomesenchyme
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Tall columnar cells

30. What is matrix?
Induction
Odontogenesis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The ectomesenchyme

31. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Commonly involves permanent maxillary lateral incisor and 3rd molars
Epithelial rests of Malassez

32. What are supernumerary teeth?
Development of one or more extra teeth
Common on permanent molars or cingulum of anterior teeth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Induction - proliferation

33. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
During the cap stage
The outer cells of the dental papilla and the central cells of the dental papilla
Union of 2 adjacent tooth germs
Tooth germ tries to divide

34. Where is the enamal organ originally derived from?
11th to 12th weeks
The ectoderm
Tall columnar cells
Compressed layer of flat to cuboidal cells

35. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The enamel organ - dental papilla - dental sac
The outer enamel epithelium
Dentin and alveolar bone

36. Where does the primordium of the permanent dentition develop?
The ectomesenchyme
The dental lamina
Hereditary
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

37. How many types of cells are found in the enamel organ in the bell stage?
Absence of single or multiple teeth
Osteocytes
Morphogenesis
4 types

38. What stage does supernumerary teeth occur?
Initiation
Into odontoblasts
4 types
During the cap stage

39. What happens during the apposition stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dental tissues secreted as matrix in successive layers.
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Induction - proliferation

40. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Local or systemic or hereditary
Epithelial rests of Malassez
Maturation
In the cap stage

41. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Local or systemic or hereditary
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Odontoblastic process
Trauma - pressure or metabolic disease

42. What is the embryological background for enamel?
Dentin secreting cells (odontoblats)
Maturation
The ectomesenchyme - which was influenced by the neural crest cells
Enamel organ

43. What is macrodontia?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Local or systemic or hereditary
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
Abnormally large teeth

44. What are entrapped cementoblasts called?
Common with permanent maxillary molars
Cementocytes
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The ameloblasts

45. What are the etiological factors for supernumerary teeth?
Hereditary
The primordium of the pulp
Hereditary in localized form. endocrine dysfunction is complete
Odontoblasts

46. What is gemination?
Ameloblasts
Absence of single or multiple teeth
Tooth germ tries to divide
Cementocytes

47. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
The dental lamina
There is unequal growth in different parts of the tooth bud
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

48. 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
Imbrication lines of von Ebner
Connective
May be confused as calculus deposit on root

49. What is the time span for the bell stage?
The permanent molars
The ameloblasts
11th to 12th weeks
The dental lamina

50. What are the clinical ramifications of anodontia?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The dental sac
An extracellular substance that is partially calcified - yet serves as a framework for later calcification