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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 are the mature cells for dentin?
Only dentinal tubules with processes
Alveolar bone
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Hereditary in localized form. endocrine dysfunction is complete

2. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The ameloblasts place an acellular dental cuticle on the new enamel surface
Enamel organ
Abnormally large teeth

3. What do the odontoblasts do?
The basement membrane
The bud stage
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

4. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The outer cells of the dental papilla and the central cells of the dental papilla
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
In the cap stage

5. How many types of cells are found in the enamel organ in the bell stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Hereditary
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
4 types

6. What will the dental papilla eventually form?
Future dentin and pulp tissue
8th week
Displacement of ameloblasts to root surface
Alveolar bone

7. What is the time span for the cap stage?
9th to 10th weeks
The basement membrane
Alveolar bone
Oral epithelium

8. What is the cap in the cap stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Outer
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The enamel organ

9. What is another name for the dental sac?
Dental follicle
The basement membrane
Cuboidal cells
Odontoblastic process

10. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
11th to 12th weeks
Commonly involves permanent maxillary lateral incisor and 3rd molars
Enamel pearl - enamel dysplasia - and concresence
The basement membrane

11. What are the etiological factors for dens in dente and gemination?
The enamel organ is compressed
Enamel organ invaginates into the dental papilla
Hereditary
Dental tissues fully mineralize to their mature levels.

12. What are the odontoblastic processes is contained in what?
Induction
A mineralized cylinder - the dentinal tubule
The actual vertical movement of the tooth
Oral epithelium

13. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Induction
11th to 12th weeks
Tooth germ

14. 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
9th to 10th weeks
Cementoid
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

15. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Odontogenesis
The dental lamina
The basement membrane

16. What are the clinical ramifications of concrescence?
Extra cusp due to effects on enamel organ
Odontoclasts
Sphere of enamel on root
Common with permanent maxillary molars

17. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Displacement of ameloblasts to root surface
Dental papilla
Alveolar bone
Induction - proliferation

18. What are the etiological factors for anodontia?
Cuboidal cells
May be confused as calculus deposit on root
Extra cusp due to effects on enamel organ
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

19. Passive eruption
Union of root structure of two or more teeth by cementum
When the gingiva recedes and no actual tooth movement takes place
6th to 7th weeks
Induction

20. When does the tooth bud become a tooth germ?
Epithelial rests of Malassez
The ameloblasts
In the cap stage
It disintegrates as the developing oral mucosa comes to line the oral cavity

21. What happens when the reduced enamel epithelium is created?
Union of 2 adjacent tooth germs
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
Alveolar bone
Tooth germ tries to divide

22. What is the function of the Hertwig's epithelial root sheath?
Initiation
Bud stage
8th week
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

23. Where is the dental sac originally derived from?
The permanent molars
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The ectomesenchyme
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

24. What are the incremental lines for cementum and alveolar bone?
Maturation
Arrest and reversal lines
Dental follicle
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

25. What are the incremental lines for dentin?
Dens in dente - gemination - tubercle - and fusion
May be confused as calculus deposit on root
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Imbrication lines of von Ebner

26. What is the time span for the bell stage?
Dentin secreting cells (odontoblats)
Odontoblastic process
Future dentin and pulp tissue
11th to 12th weeks

27. What is the embryological background for dentin - cementum and alveolar bone?
Maturation
Odontoclasts
Dental tissues secreted as matrix in successive layers.
Dental papilla

28. What is an enamel pearl?
Sphere of enamel on root
Common with permanent maxillary molars
11th to 12th weeks
Preameloblasts

29. What are the mature cells for cementum?
Enamel secreting cells (ameloblasts)
Epithelial rests of Malassez
Cementocytes
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

30. What stage does supernumerary teeth occur?
Initiation
Dental tissues secreted as matrix in successive layers.
Lines of Retzuis
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

31. The preameloblasts induce dental papilla cells to differentiate into what?
Dentin secreting cells (odontoblats)
Into odontoblasts
Extra cusp due to effects on enamel organ
The ameloblasts

32. What are the formative cells for cementum?
Dentin and alveolar bone
Cementoblasts
During the cap stage
Bud stage

33. The stratum intermediate is located inner or outer?
Odontoblastic process
Cementocytes
Inner
Faulty development of enamel from interference involving ameloblasts

34. What happens during initiation?
Traumatic injury or crowding of teeth
The ameloblasts place an acellular dental cuticle on the new enamel surface
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
Induction

35. The stellate reticulum is located inner or outer?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The stellate reticulum
Outer
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

36. What are the incremental lines for enamel?
As a result of the apposition of cementum over dentin
Tall columnar cells
Odontoclasts
Lines of Retzuis

37. What is macrodontia?
Local or systemic or hereditary
Abnormally large teeth
Dental tissues fully mineralize to their mature levels.
Preameloblasts

38. What is matrix?
Maturation
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dens in dente - gemination - tubercle - and fusion
The ameloblasts

39. What are the etiological factors for fusion?
Enamel
Pressure on the area
Cementoblasts
Apposition of the cementum

40. What are the etiological factors for supernumerary teeth?
Initiation
Extra cusp due to effects on enamel organ
Hereditary
Sphere of enamel on root

41. What are the clinical ramifications?
Dental tissues secreted as matrix in successive layers.
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Common on permanent molars or cingulum of anterior teeth
Tall columnar cells

42. What are the clinical ramifications of fusion?
Common on permanent molars or cingulum of anterior teeth
When the gingiva recedes and no actual tooth movement takes place
Lines of Retzuis
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

43. What hard tissue is can not have tissue formation after eruption?
Enamel organ
Enamel
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Enamel secreting cells (ameloblasts)

44. What are the major components of the tooth germ?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Morphogenesis
The enamel organ - dental papilla - dental sac
Cementoblasts

45. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Connective
Odontogenesis
Hereditary
Preameloblasts

46. What is tubercle?
The enamel organ - dental papilla - dental sac
The ectoderm
Extra cusp due to effects on enamel organ
Tall columnar cells

47. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The cementum - PDL - and alveolar bone
The permanent molars
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

48. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Induction - proliferation
Cementoid

49. What are the clinical ramifications of anodontia?
Future dentin and pulp tissue
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
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
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

50. What is the structure responsible for root development?
The cervical loop
Compressed layer of flat to cuboidal cells
Future dentin and pulp tissue
Sphere of enamel on root

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Dentistry Tooth Development And Eruption

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