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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 etiological factors for fusion?
Cementocytes
Pressure on the area
Oral epithelium
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

2. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Commonly involves permanent maxillary lateral incisor and 3rd molars
Enamel organ invaginates into the dental papilla
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

3. Where is the enamel matrix secreted from by the ameloblasts?

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4. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
The dental lamina
The stellate reticulum
Cementoblasts

5. What are the formative cells for alveolar bone?
Dental papilla
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Osteoblasts
When the gingiva recedes and no actual tooth movement takes place

6. What is the cementum matrix called?
Displacement of ameloblasts to root surface
Cementoid
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Dental follicle

7. What is dens in dente?
The basement membrane
Enamel organ invaginates into the dental papilla
Common on permanent molars or cingulum of anterior 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

8. In the cap stage the tooth bud does not grow - what happens?
In the cap stage
The enamel - dentin - and cementum are secreted in successive layers
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
There is unequal growth in different parts of the tooth bud

9. 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
The ectoderm
Displacement of ameloblasts to root surface

10. What will the dental sac give rise to?
Trauma - pressure or metabolic disease
Tooth germ
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The cementum - PDL - and alveolar bone

11. Do odontoblasts start their secretion of matrix before the ameloblasts?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Lines of Retzuis
Dens in dente - gemination - tubercle - and fusion
Proliferation

12. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
When the gingiva recedes and no actual tooth movement takes place
The tooth germ
Preameloblasts
Odontoblasts

13. What kind of cells occur in the inner enamel epithelium?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Connective
Tall columnar cells
The dental lamina

14. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Cementoid
Maturation
Osteocytes

15. What are the major components of the tooth germ?
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.
The enamel organ - dental papilla - dental sac
Tooth germ tries to divide
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

16. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Osteocytes
A mineralized cylinder - the dentinal tubule
Dental tissues secreted as matrix in successive layers.

17. What hard tissue is innervated by nerves?
Common with permanent maxillary molars
Dentin and alveolar bone
Maturation
Dentin secreting cells (odontoblats)

18. When does dens in dente occur?
9th to 10th weeks
It disintegrates as the developing oral mucosa comes to line the oral cavity
Bud stage
During the cap stage

19. What processes are involved in the bell stage?
The cervical loop
Absence of single or multiple teeth
Arrest and reversal lines
Differentiation - proliferation - morphogenesis

20. What are the formative cells for dentin?
Odontoblasts
Enamel
Cementoblasts
Trauma - pressure or metabolic disease

21. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Dental papilla
Enamel organ invaginates into the dental papilla
Odontoblastic process
4 types

22. What is the predominate process of the cap stage?
Extra cusp due to effects on enamel organ
Dens in dente - gemination - tubercle - and fusion
The outer enamel epithelium
Morphogenesis

23. What is the process involved in the maturation stage?
The actual vertical movement of the tooth
The dental lamina
Proliferation
Maturation

24. Where is the dental papilla originally derived from?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Odontogenesis
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The ectomesenchyme - which was influenced by the neural crest cells

25. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Abnormally large teeth
A mineralized cylinder - the dentinal tubule
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 ameloblasts place an acellular dental cuticle on the new enamel surface

26. How many types of cells are found in the enamel organ in the bell stage?
Oral epithelium
Maturation
4 types
Dental tissues fully mineralize to their mature levels.

27. What is enamel dysplasia?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
There are none - they are lost with eruption
Enamel organ
Faulty development of enamel from interference involving ameloblasts

28. What are the etiological factors for anodontia?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Lines of Retzuis
The enamel organ is compressed

29. What are the incremental lines for dentin?
Cuboidal cells
Imbrication lines of von Ebner
Dentin and alveolar bone
Union of 2 adjacent tooth germs

30. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Induction - proliferation
Cementoblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The bud stage

31. What is tubercle?
Extra cusp due to effects on enamel organ
Dentin and alveolar bone
Dental tissues fully mineralize to their mature levels.
6th to 7th weeks

32. Tooth development
Odontogenesis
Cementocytes
A mineralized cylinder - the dentinal tubule
Tall columnar cells

33. What else undergoes proliferation in the bud stage besides the dental lamina?
The ectomesenchyme
Common with permanent maxillary molars
The cementum - PDL - and alveolar bone
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

34. What are the clinical ramifications of supernumerary 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
Epithelial
Abnormally small teeth
The cementum - PDL - and alveolar bone

35. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Cementocytes
Imbrication lines of von Ebner
The actual vertical movement of the tooth

36. What are the incremental lines for enamel?
Cementoblasts
Imbrication lines of von Ebner
Lines of Retzuis
Cuboidal cells

37. What is cementogenisis?
Apposition of the cementum
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
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
Cementocytes

38. What is another name for the dental sac?
Ameloblasts
Local or systemic or hereditary
Dental follicle
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

39. What happens during the cap stage?
Traumatic injury or crowding of teeth
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.
Odontoblastic process
Abnormally large teeth

40. What is the structure responsible for root development?
Imbrication lines of von Ebner
Epithelial
The cervical loop
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

41. What are entrapped cementoblasts called?
Cementocytes
Arrest and reversal lines
Hereditary
Dens in dente - gemination - tubercle - and fusion

42. What are the formative cells for cementum?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Future dentin and pulp tissue
Cementoblasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

43. How is the dentinocemental junction formed?
Development of one or more extra teeth
The ectomesenchyme
As a result of the apposition of cementum over dentin
Common with permanent maxillary molars

44. What are the clinical ramifications of gemination?

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45. What are the etiological factors for supernumerary teeth?
Only dentinal tubules with processes
Maturation
Hereditary
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

46. When does macro/microdontia occur?
Induction
Bud stage
The ameloblasts
Odontoblastic process

47. What are the incremental lines for cementum and alveolar bone?
Alveolar bone
Ameloblasts
Arrest and reversal lines
It disintegrates as the developing oral mucosa comes to line the oral cavity

48. What layer serves as protection for the enamel organ?
The outer enamel epithelium
Hereditary in localized form. endocrine dysfunction is complete
A mineralized cylinder - the dentinal tubule
Dental follicle

49. What is the cap in the cap stage?
The basement membrane
A bilayer rim that consists only IEE and OEE
The enamel organ
Dental follicle

50. Where is the enamal organ originally derived from?
The ectoderm
Maturation
Tooth germ
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants