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 are the mature cells for cementum?
Cementocytes
11th to 12th weeks
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

2. What is dens in dente?
Faulty development of enamel from interference involving ameloblasts
Enamel organ invaginates into the dental papilla
A mineralized cylinder - the dentinal tubule
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

3. What is the time span for the bell stage?
Compressed layer of flat to cuboidal cells
Displacement of ameloblasts to root surface
11th to 12th weeks
The outer enamel epithelium

4. What is the cementum matrix called?
The tooth germ
9th to 10th weeks
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Cementoid

5. What is cementogenisis?
Enamel secreting cells (ameloblasts)
Apposition of the cementum
The basement membrane that seperates the enamel organ and dental papilla
Proliferation

6. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Cuboidal cells
Apposition of the cementum
The ameloblasts place an acellular dental cuticle on the new enamel surface

7. Passive eruption
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
When the gingiva recedes and no actual tooth movement takes place
There is unequal growth in different parts of the tooth bud
Tooth germ

8. What stage does the dental tissues subsequently fully mineralize
Tooth germ tries to divide
Differentiation
Maturation
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

9. The stellate reticulum is located inner or outer?
Imbrication lines of von Ebner
The enamel - dentin - and cementum are secreted in successive layers
Outer
The basement membrane

10. What are the etiological factors of tubercle?
6th to 7th weeks
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
4 types
Trauma - pressure or metabolic disease

11. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Initiation
Into odontoblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

12. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Osteoblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The basement membrane

13. What do the odontoblasts do?
Dental tissues fully mineralize to their mature levels.
It disintegrates as the developing oral mucosa comes to line the oral cavity
When the gingiva recedes and no actual tooth movement takes place
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

14. Which teeth are nonsuccedaneous?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Connective
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The permanent molars

15. What are the formative cells for cementum?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Cementoblasts
The actual vertical movement of the tooth
Inner

16. What happens during the cap stage?
The actual vertical movement of the tooth
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 organ invaginates into the dental papilla
Initiation stage

17. When does dens in dente occur?
During the cap stage
Dentin and alveolar bone
Odontoblasts
Osteocytes

18. When does the tooth bud become a tooth germ?
The ameloblasts
The basement membrane
In the cap stage
The ectomesenchyme

19. What will the inner cells of the dental lamina differentiates into?
The dental lamina
The primordium of the pulp
The cementum - PDL - and alveolar bone
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

20. Which layer in the bell stage has star shaped cells?
The stellate reticulum
Into odontoblasts
The apposition of the enamel matrix
Epithelial rests of Malassez

21. What is the primordium of the tooth?
The ameloblasts
The tooth germ
The dental sac
Hereditary in localized form. endocrine dysfunction is complete

22. What are the incremental lines for enamel?
When the gingiva recedes and no actual tooth movement takes place
11th to 12th weeks
The enamel organ is compressed
Lines of Retzuis

23. What are the etiological factors of concrescence?
A bilayer rim that consists only IEE and OEE
Outer
Traumatic injury or crowding of teeth
Development of one or more extra teeth

24. What are the mature cells for alveolar bone?
Osteocytes
The basement membrane
Future dentin and pulp tissue
The apposition of the enamel matrix

25. What is microdontia?
Enamel pearl - enamel dysplasia - and concresence
Abnormally small teeth
9th to 10th weeks
Imbrication lines of von Ebner

26. Where does the primordium of the permanent dentition develop?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ameloblasts place an acellular dental cuticle on the new enamel surface
Common on permanent molars or cingulum of anterior teeth
The ectoderm

27. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Proliferation
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

28. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The apposition of the enamel matrix
Displacement of ameloblasts to root surface
Dental papilla
Differentiation - proliferation - morphogenesis

29. What wll the inner enamel epithelium differentiate into?
Abnormally large teeth
Dentin and alveolar bone
Union of root structure of two or more teeth by cementum
Enamel secreting cells (ameloblasts)

30. What are the clinical ramifications of micro/macrodontia?
Abnormally large teeth
Compressed layer of flat to cuboidal cells
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Commonly involves permanent maxillary lateral incisor and 3rd molars

31. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Outer
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Abnormally small teeth
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

32. What will the outer cells of the dental lamina differentiate into?
Faulty development of enamel from interference involving ameloblasts
Dentin secreting cells (odontoblats)
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
In the cap stage

33. What is tubercle?
The ectomesenchyme
Extra cusp due to effects on enamel organ
The ameloblasts place an acellular dental cuticle on the new enamel surface
Initiation stage

34. Where is the enamal organ originally derived from?
Only dentinal tubules with processes
The ectoderm
Hereditary
Traumatic injury or crowding of teeth

35. What are the etiological factors for fusion?
Enamel
Pressure on the area
The ectomesenchyme - which was influenced by the neural crest cells
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

36. What is the structure responsible for root development?
Alveolar bone
The cervical loop
Into odontoblasts
There are none - they are lost with eruption

37. What type of tissue is dentin - cementum - and alveolar bone?
Initiation
The basement membrane that seperates the enamel organ and dental papilla
Cuboidal cells
Connective

38. How many types of cells are found in the enamel organ in the bell stage?
May be confused as calculus deposit on root
Osteocytes
4 types
The ameloblasts

39. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
4 types
Cementocytes
Initiation

40. The preameloblasts induce dental papilla cells to differentiate into what?
Local or systemic or hereditary
Dens in dente - gemination - tubercle - and fusion
A mineralized cylinder - the dentinal tubule
Into odontoblasts

41. What happens when the reduced enamel epithelium is created?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ameloblasts
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
Odontoblasts

42. What is the embryological background for enamel?
Enamel organ
The enamel organ
There is unequal growth in different parts of the tooth bud
The ameloblasts

43. What is the main process involved in initiation?
Development of one or more extra teeth
Displacement of ameloblasts to root surface
Maturation
Induction

44. What is the cap in the cap stage?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The enamel organ
As a result of the apposition of cementum over dentin
Pressure on the area

45. What is the time span for the bud stage?
The ectomesenchyme
8th week
Arrest and reversal lines
Osteoblasts

46. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Epithelial rests of Malassez
The outer cells of the dental papilla and the central cells of the dental papilla
Common with permanent maxillary molars
Oral epithelium

47. What are the formative cells for alveolar bone?
Union of root structure of two or more teeth by cementum
Osteoblasts
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Into odontoblasts

48. What is the predominate process of the cap stage?
Displacement of ameloblasts to root surface
Differentiation
Morphogenesis
Dens in dente - gemination - tubercle - and fusion

49. What hard tissue has vascularity?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Alveolar bone
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Cementocytes

50. What are supernumerary teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Faulty development of enamel from interference involving ameloblasts
Development of one or more extra teeth
As a result of the apposition of cementum over dentin