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. What is the time span for initiation?
Enamel organ invaginates into the dental papilla
Dentin and alveolar bone
6th to 7th weeks
Cementocytes

2. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Odontogenesis
The basement membrane
Development of one or more extra teeth

3. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Hereditary
Outer
Cementocytes

4. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The basement membrane
Dentin and alveolar bone
Dental follicle

5. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
Dens in dente - gemination - tubercle - and fusion
4 types
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

6. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Imbrication lines of von Ebner
Ameloblasts
Common with permanent maxillary molars
The basement membrane

7. What are the odontoblastic processes is contained in what?
Oral epithelium
Maturation
A mineralized cylinder - the dentinal tubule
Into odontoblasts

8. 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
The enamel organ - dental papilla - dental sac
Tooth germ
Maturation

9. What processes are involved with the apposition stage?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Induction - proliferation
Bud stage
Development of one or more extra teeth

10. What are supernumerary teeth?
Sphere of enamel on root
Epithelial
The enamel organ is compressed
Development of one or more extra teeth

11. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Dental papilla
Hereditary in localized form. endocrine dysfunction is complete
Dentin and alveolar bone

12. What is the primordium of the tooth?
Union of 2 adjacent tooth germs
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The primordium of the pulp
The tooth germ

13. What is the embryological background for enamel?
The permanent molars
Enamel organ
Cementocytes
Bud stage

14. What are the etiological factors for supernumerary teeth?
Odontoclasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The ameloblasts place an acellular dental cuticle on the new enamel surface
Hereditary

15. What do the odontoblasts do?
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
Lines of Retzuis
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

16. What are the formative cells for cementum?
A mineralized cylinder - the dentinal tubule
Cementoblasts
Odontoblastic process
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

17. What type of tissue is dentin - cementum - and alveolar bone?
4 types
Abnormally large teeth
Connective
Only dentinal tubules with processes

18. What happens during the bell stage?
The outer enamel epithelium
Dental papilla
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
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

19. What are the etiological factors for dens in dente and gemination?
Hereditary
4 types
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dentin secreting cells (odontoblats)

20. Do odontoblasts start their secretion of matrix before the ameloblasts?
Absence of single or multiple teeth
Induction
Epithelial
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

21. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Traumatic injury or crowding of teeth
The bud stage
Cuboidal cells

22. What processes are involved in the bell stage?
Dental papilla
Differentiation - proliferation - morphogenesis
The ectoderm
Connective

23. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Cementoblasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Dentin secreting cells (odontoblats)

24. What is another name for the dental sac?
Dental follicle
May be confused as calculus deposit on root
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
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

25. What is macrodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
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
Abnormally large teeth
Maturation

26. What is the main process involved in the bud stage?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Abnormally small teeth
Proliferation
Enamel secreting cells (ameloblasts)

27. What are the clinical ramifications of supernumerary teeth?
Traumatic injury or crowding of 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
Tall columnar cells
Common on permanent molars or cingulum of anterior teeth

28. What is the time span for the bud stage?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The primordium of the pulp
The basement membrane
8th week

29. When does dens in dente occur?
The basement membrane
During the cap stage
Dental follicle
Tall columnar cells

30. What is the time span for the bell 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
11th to 12th weeks
Abnormally large teeth
Enamel

31. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The enamel organ
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The ameloblasts
The ectomesenchyme - which was influenced by the neural crest cells

32. What wll the inner enamel epithelium differentiate into?
As a result of the apposition of cementum over dentin
Enamel secreting cells (ameloblasts)
Induction - proliferation
Absence of single or multiple teeth

33. What are the mature cells for cementum?
Cementocytes
Osteocytes
Lines of Retzuis
Local or systemic or hereditary

34. What are the formative cells for enamel?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The dental lamina
Alveolar bone
Ameloblasts

35. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
Hereditary
A mineralized cylinder - the dentinal tubule
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

36. What are the clinical ramifications of concrescence?
Hereditary in localized form. endocrine dysfunction is complete
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Common with permanent maxillary molars
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

37. What is the structure responsible for root development?
The cervical loop
Odontoblastic process
Preameloblasts
The stellate reticulum

38. What is the predominate process of the cap stage?
Morphogenesis
Trauma - pressure or metabolic disease
Dentin and alveolar bone
Odontogenesis

39. What are the etiological factors of enamel dysplasia?
Displacement of ameloblasts to root surface
Dental tissues fully mineralize to their mature levels.
The actual vertical movement of the tooth
Local or systemic or hereditary

40. The oral epithelium is induced by the ectomesenchyme to produce what?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Enamel
Cementoblasts
The dental lamina

41. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Morphogenesis
Dental tissues fully mineralize to their mature levels.
The dental lamina

42. Active eruption
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The actual vertical movement of the tooth
Maturation
When the gingiva recedes and no actual tooth movement takes place

43. What are the mature cells for alveolar bone?
Osteocytes
Enamel organ invaginates into the dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

44. What are the mature cells for enamel?
There are none - they are lost with eruption
9th to 10th weeks
Dental papilla
6th to 7th weeks

45. What are the incremental lines for cementum and alveolar bone?
Common with permanent maxillary molars
Common on permanent molars or cingulum of anterior teeth
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Arrest and reversal lines

46. What is the embryological background for dentin - cementum and alveolar bone?
Epithelial
Differentiation
Dental tissues fully mineralize to their mature levels.
Dental papilla

47. What stage does anodontia occur?
The cervical loop
Initiation stage
In the cap stage
The enamel organ

48. What will the dental papilla eventually form?
The cementum - PDL - and alveolar bone
Dentin secreting cells (odontoblats)
Only dentinal tubules with processes
Future dentin and pulp tissue

49. Which teeth are nonsuccedaneous?
Tooth germ
Dental papilla
The permanent molars
Absence of single or multiple teeth

50. What is concrescence?
A bilayer rim that consists only IEE and OEE
Imbrication lines of von Ebner
Union of root structure of two or more teeth by cementum
The tooth germ