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. Active eruption
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The actual vertical movement of the tooth
Enamel organ
The basement membrane that seperates the enamel organ and dental papilla

2. What happens during the maturation stage?
Enamel
The dental sac
Dental tissues fully mineralize to their mature levels.
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

3. What will the outer cells of the dental lamina differentiate into?
Absence of single or multiple teeth
May be confused as calculus deposit on root
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Dentin secreting cells (odontoblats)

4. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Epithelial rests of Malassez
Pressure on the area
The enamel organ is compressed
The ameloblasts place an acellular dental cuticle on the new enamel surface

5. What does the cervical loop consist of?
Dental tissues fully mineralize to their mature levels.
Commonly involves permanent maxillary lateral incisor and 3rd molars
Cementocytes
A bilayer rim that consists only IEE and OEE

6. The stellate reticulum is located inner or outer?
Apposition of the cementum
Odontoblasts
Induction - proliferation
Outer

7. What are succedaneous teeth?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The enamel organ - dental papilla - dental sac
Pressure on the area

8. What is anodontia?
Outer
Epithelial rests of Malassez
Pressure on the area
Absence of single or multiple teeth

9. What is the primordium of the tooth?
Cementocytes
Future dentin and pulp tissue
The tooth germ
8th week

10. What hard tissue has vascularity?
Apposition of the cementum
During the cap stage
Differentiation
Alveolar bone

11. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The basement membrane that seperates the enamel organ and dental papilla
Cementoblasts

12. What are the mature cells for cementum?
Cementocytes
Odontoclasts
Dens in dente - gemination - tubercle - and fusion
Enamel

13. What is matrix?
The basement membrane
Into odontoblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Enamel organ

14. Do odontoblasts start their secretion of matrix before the ameloblasts?
Epithelial rests of Malassez
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Cementoid
Enamel organ

15. What is an enamel pearl?
The outer cells of the dental papilla and the central cells of the dental papilla
Sphere of enamel on root
Tooth germ
The basement membrane

16. What type of tissue is enamel?
The dental lamina
Epithelial
Maturation
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

17. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Enamel organ invaginates into the dental papilla
Odontoblastic process
In the cap stage
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

18. What are the clinical ramifications of fusion?
Cementoblasts
Oral epithelium
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

19. What is another name for the dental sac?
The apposition of the enamel matrix
Dental follicle
Absence of single or multiple teeth
Enamel organ

20. What happens during the apposition stage?
Cementoid
Cementoblasts
Abnormally large teeth
Dental tissues secreted as matrix in successive layers.

21. What type of tissue is dentin - cementum - and alveolar bone?
11th to 12th weeks
The ectomesenchyme
Extra cusp due to effects on enamel organ
Connective

22. What are the incremental lines for cementum and alveolar bone?
Odontogenesis
Osteocytes
Arrest and reversal lines
Epithelial

23. What are supernumerary teeth?
Development of one or more extra teeth
Abnormally small teeth
A bilayer rim that consists only IEE and OEE
Initiation stage

24. What else undergoes proliferation in the bud stage besides the dental lamina?
Morphogenesis
6th to 7th weeks
The dental sac
The ectomesenchyme

25. What are the etiological factors for supernumerary teeth?
Hereditary
The bud stage
Dens in dente - gemination - tubercle - and fusion
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

26. What are the etiological factors of enamel dysplasia?
The apposition of the enamel matrix
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Local or systemic or hereditary
Oral epithelium

27. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Inner
There is unequal growth in different parts of the tooth bud
The bud stage
The stellate reticulum

28. What happens during the appositional stage?
Initiation stage
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The enamel - dentin - and cementum are secreted in successive layers
Dental follicle

29. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Odontogenesis

30. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Induction
Union of root structure of two or more teeth by cementum
Epithelial rests of Malassez
Imbrication lines of von Ebner

31. What stage does supernumerary teeth occur?
Initiation
Sphere of enamel on root
Union of 2 adjacent tooth germs
The basement membrane that seperates the enamel organ and dental papilla

32. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Tooth germ
The ectoderm
Epithelial

33. What is gemination?
Dentin and alveolar bone
Tooth germ tries to divide
Initiation stage
Hereditary

34. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The basement membrane
Common on permanent molars or cingulum of anterior teeth
Absence of single or multiple teeth

35. What are the mature cells for dentin?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Only dentinal tubules with processes
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.
During the cap stage

36. What is the function of the Hertwig's epithelial root sheath?
4 types
The outer enamel epithelium
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Lines of Retzuis

37. What is the predominate process in the bell stage?
Differentiation
The enamel organ is compressed
Hereditary
A mineralized cylinder - the dentinal tubule

38. What kind of cells reside in the stratum intermediate?
Tooth germ
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Compressed layer of flat to cuboidal cells
Differentiation

39. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Dental papilla
Maturation
Tooth germ
The ectomesenchyme - which was influenced by the neural crest cells

40. What kind of cells occur in the inner enamel epithelium?
Abnormally large teeth
Extra cusp due to effects on enamel organ
Tall columnar cells
There is unequal growth in different parts of the tooth bud

41. What is cementogenisis?
Trauma - pressure or metabolic disease
Maturation
Apposition of the cementum
Enamel organ invaginates into the dental papilla

42. What is enamel dysplasia?
The ectoderm
Faulty development of enamel from interference involving ameloblasts
Cementocytes
Connective

43. What is concrescence?
Union of root structure of two or more teeth by cementum
Development of one or more extra teeth
The ameloblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

44. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Tall columnar cells
Absence of single or multiple teeth
Preameloblasts
Only dentinal tubules with processes

45. The stratum intermediate is located inner or outer?
The enamel - dentin - and cementum are secreted in successive layers
Local or systemic or hereditary
Imbrication lines of von Ebner
Inner

46. What are the incremental lines for dentin?
Initiation
Imbrication lines of von Ebner
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The basement membrane

47. What are the etiological factors of tubercle?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The basement membrane
Trauma - pressure or metabolic disease
Lines of Retzuis

48. What is the outer portion of the ectoderm in the initiation stage?
Proliferation - differentiation - morphogenesis
Maturation
Faulty development of enamel from interference involving ameloblasts
Oral epithelium

49. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
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 disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Cuboidal cells

50. What are the clinical ramifications of supernumerary teeth?
Absence of single or multiple 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
Proliferation - differentiation - morphogenesis
The ectomesenchyme