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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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 type of tissue is enamel?
Dens in dente - gemination - tubercle - and fusion
The ectoderm
Local or systemic or hereditary
Epithelial

2. What happens during the maturation stage?
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
The enamel organ - dental papilla - dental sac
Apposition of the cementum
Dental tissues fully mineralize to their mature levels.

3. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
Osteocytes
The enamel organ is compressed
The primordium of the pulp

4. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
The dental lamina
Imbrication lines of von Ebner
Enamel secreting cells (ameloblasts)

5. The stellate reticulum is located inner or outer?
Outer
Enamel
The basement membrane
Dental tissues fully mineralize to their mature levels.

6. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
The cementum - PDL - and alveolar bone
The dental lamina
Dentin secreting cells (odontoblats)

7. What are the formative cells for alveolar bone?
Dental tissues fully mineralize to their mature levels.
Lines of Retzuis
The basement membrane
Osteoblasts

8. 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
Enamel pearl - enamel dysplasia - and concresence
Induction
The ameloblasts

9. What is the time span for the bud stage?
8th week
Cementoblasts
Odontoblastic process
Imbrication lines of von Ebner

10. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
Tooth germ tries to divide
The permanent molars
Imbrication lines of von Ebner

11. What is another name for the dental sac?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Extra cusp due to effects on enamel organ
Dental follicle
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

12. What does the cervical loop consist of?
Enamel organ invaginates into the dental papilla
The bud stage
A bilayer rim that consists only IEE and OEE
Lines of Retzuis

13. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Outer
The outer enamel epithelium
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The outer cells of the dental papilla and the central cells of the dental papilla

14. What is the structure responsible for root development?
A bilayer rim that consists only IEE and OEE
Initiation stage
The cervical loop
Arrest and reversal lines

15. What are succedaneous teeth?
Compressed layer of flat to cuboidal cells
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Displacement of ameloblasts to root surface
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

16. What happens during initiation?
Displacement of ameloblasts to root surface
Cementocytes
Commonly involves permanent maxillary lateral incisor and 3rd 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

17. Tooth development
Only dentinal tubules with processes
Initiation
Preameloblasts
Odontogenesis

18. Passive eruption
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
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
Sphere of enamel on root
When the gingiva recedes and no actual tooth movement takes place

19. What are the etiological factors for supernumerary teeth?
Odontoblastic process
Hereditary
The outer cells of the dental papilla and the central cells of the dental papilla
Maturation

20. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Tall columnar cells
The outer enamel epithelium
11th to 12th weeks

21. What hard tissue is innervated by nerves?
Cementoblasts
Dentin and alveolar bone
Tooth germ tries to divide
During the cap stage

22. What are the formative cells for cementum?
Traumatic injury or crowding of teeth
Enamel secreting cells (ameloblasts)
Cementoblasts
The ectomesenchyme - which was influenced by the neural crest cells

23. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Tall columnar cells
The ameloblasts
The basement membrane
Osteocytes

24. What is the predominate process in the bell stage?
Differentiation
Arrest and reversal lines
The ectomesenchyme
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

25. What is dens in dente?
Enamel organ invaginates into the dental papilla
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The ectomesenchyme - which was influenced by the neural crest cells
Initiation stage

26. What is the function of the Hertwig's epithelial root sheath?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Odontoblasts
Induction
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

27. What are the clinical ramifications of dens in dente?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Hereditary
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Arrest and reversal lines

28. What processes are involved with the apposition stage?
Induction - proliferation
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Dental follicle
The dental lamina

29. The oral epithelium is induced by the ectomesenchyme to produce what?
Tall columnar cells
The dental lamina
Dentin and alveolar bone
Sphere of enamel on root

30. What do the odontoblasts do?
There are none - they are lost with eruption
Hereditary
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

31. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Odontoclasts
In the cap stage
Preameloblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

32. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Dental papilla
Initiation stage
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

33. What is the cap in the cap stage?
Proliferation
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Local or systemic or hereditary
The enamel organ

34. How many types of cells are found in the enamel organ in the bell stage?
There are none - they are lost with eruption
Compressed layer of flat to cuboidal cells
4 types
Differentiation

35. When does the tooth bud become a tooth germ?
The tooth germ
Oral epithelium
In the cap stage
Union of 2 adjacent tooth germs

36. What is microdontia?
Abnormally small teeth
Odontoblastic process
Future dentin and pulp tissue
Imbrication lines of von Ebner

37. Where is the enamal organ originally derived from?
Abnormally small teeth
The ectoderm
The bud stage
Common with permanent maxillary molars

38. What stage does the dental tissues subsequently fully mineralize
The ameloblasts place an acellular dental cuticle on the new enamel surface
Maturation
Hereditary
Initiation

39. Which layer in the bell stage has star shaped cells?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dental tissues fully mineralize to their mature levels.
The bud stage
The stellate reticulum

40. What is concrescence?
Extra cusp due to effects on enamel organ
Common on permanent molars or cingulum of anterior teeth
Union of root structure of two or more teeth by cementum
Dental tissues fully mineralize to their mature levels.

41. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Future dentin and pulp tissue
Initiation
Cementocytes

42. What are entrapped cementoblasts called?
The basement membrane
Proliferation - differentiation - morphogenesis
Cementocytes
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

43. What is the process involved in the maturation stage?
Initiation
Maturation
The enamel organ - dental papilla - dental sac
Odontoclasts

44. What is the primordium of the tooth?
The cervical loop
The apposition of the enamel matrix
The tooth germ
Tooth germ tries to divide

45. What happens when the reduced enamel epithelium is created?
Enamel organ
Dental papilla
Enamel organ invaginates into the dental papilla
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

46. What is macrodontia?
Abnormally large teeth
In the cap stage
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Development of one or more extra teeth

47. What hard tissue is can not have tissue formation after eruption?
Enamel
Osteocytes
Epithelial rests of Malassez
The enamel organ

48. What will the dental sac give rise to?
The ectomesenchyme - which was influenced by the neural crest cells
Union of root structure of two or more teeth by cementum
There is unequal growth in different parts of the tooth bud
The cementum - PDL - and alveolar bone

49. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
Ameloblasts
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 - proliferation - morphogenesis

50. What are the clinical ramifications?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The enamel organ
Common on permanent molars or cingulum of anterior teeth