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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?
Proliferation - differentiation - morphogenesis
Dental papilla
The cementum - PDL - and alveolar bone
Epithelial

2. What are the etiological factors for supernumerary teeth?
Hereditary
The permanent molars
Future dentin and pulp tissue
Extra cusp due to effects on enamel organ

3. What are the incremental lines for enamel?
The enamel - dentin - and cementum are secreted in successive layers
Development of one or more extra teeth
Lines of Retzuis
The outer cells of the dental papilla and the central cells of the dental papilla

4. Where is the dental sac originally derived from?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Differentiation - proliferation - morphogenesis
The ectomesenchyme
The cementum - PDL - and alveolar bone

5. Passive eruption
When the gingiva recedes and no actual tooth movement takes place
Maturation
Epithelial
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

6. What stage does anodontia occur?
Induction
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.
Initiation stage
Only dentinal tubules with processes

7. Which layer in the bell stage has star shaped cells?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dental papilla
The stellate reticulum
Trauma - pressure or metabolic disease

8. What is tubercle?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Traumatic injury or crowding of teeth
Extra cusp due to effects on enamel organ
8th week

9. What are the odontoblastic processes is contained in what?
Dens in dente - gemination - tubercle - and fusion
A mineralized cylinder - the dentinal tubule
9th to 10th weeks
The actual vertical movement of the tooth

10. What is the time span for the cap stage?
9th to 10th weeks
The outer enamel epithelium
The ectoderm
Dental papilla

11. What is another name for the dental sac?
Dental follicle
The enamel - dentin - and cementum are secreted in successive layers
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
It disintegrates as the developing oral mucosa comes to line the oral cavity

12. What is the time span for the bell stage?
11th to 12th weeks
Cementoblasts
Odontoclasts
A bilayer rim that consists only IEE and OEE

13. What is fusion?
Cementocytes
Union of 2 adjacent tooth germs
Pressure on the area
Faulty development of enamel from interference involving ameloblasts

14. What is macrodontia?
Abnormally large teeth
Extra cusp due to effects on enamel organ
Absence of single or multiple teeth
Cementocytes

15. What happens during the maturation stage?
A bilayer rim that consists only IEE and OEE
Union of 2 adjacent tooth germs
Dental tissues fully mineralize to their mature levels.
Odontoblasts

16. 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
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The basement membrane
Induction

17. What is the time span for the bud stage?
8th week
The bud stage
Dental follicle
Osteoblasts

18. What hard tissue has vascularity?
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
Induction
Alveolar bone
Cementocytes

19. What is the main process involved in initiation?
Cementocytes
The cementum - PDL - and alveolar bone
Common with permanent maxillary molars
Induction

20. Active eruption
Union of 2 adjacent tooth germs
The actual vertical movement of the tooth
Maturation
Enamel organ

21. What is cementogenisis?
Pressure on the area
Extra cusp due to effects on enamel organ
Cementoblasts
Apposition of the cementum

22. What are the mature cells for alveolar bone?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Inner
The ameloblasts place an acellular dental cuticle on the new enamel surface
Osteocytes

23. What happens during initiation?
The bud stage
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
Morphogenesis
Compressed layer of flat to cuboidal cells

24. The stellate reticulum is located inner or outer?
Outer
The enamel organ
When the gingiva recedes and no actual tooth movement takes place
11th to 12th weeks

25. What is the cap in the cap stage?
The enamel organ
Cementoblasts
In the cap stage
The tooth germ

26. What is the predominate process in the bell stage?
The basement membrane that seperates the enamel organ and dental papilla
Tooth germ tries to divide
The ectomesenchyme
Differentiation

27. What are the clinical ramifications of dens in dente?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The dental lamina
The enamel organ - dental papilla - dental sac
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

28. In the cap stage the tooth bud does not grow - what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dental papilla
There is unequal growth in different parts of the tooth bud
Faulty development of enamel from interference involving ameloblasts

29. What is the predominate process of the cap stage?
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
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Morphogenesis

30. What are the clinical ramifications of concrescence?
Bud stage
In the cap stage
Common with permanent maxillary molars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

31. What is the time span for initiation?
Bud stage
6th to 7th weeks
Apposition of the cementum
Epithelial rests of Malassez

32. What are the incremental lines for cementum and alveolar bone?
Induction - proliferation
The tooth germ
Into odontoblasts
Arrest and reversal lines

33. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Maturation
The bud stage
Abnormally small teeth
The dental lamina

34. What kind of cells occur in the inner enamel epithelium?
Enamel
Tall columnar cells
Union of root structure of two or more teeth by cementum
Future dentin and pulp tissue

35. What layer serves as protection for the enamel organ?
The outer enamel epithelium
Common with permanent maxillary molars
8th week
Tooth germ tries to divide

36. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
Abnormally small teeth
Absence of single or multiple teeth
8th week

37. What are the mature cells for enamel?
Dental follicle
The stellate reticulum
There is unequal growth in different parts of the tooth bud
There are none - they are lost with eruption

38. What are the cell layers found in the enamel organ in the bell stage?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The enamel organ is compressed
Cementoid
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

39. What are the clinical ramifications of fusion?
The basement membrane
Cuboidal cells
Oral epithelium
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

40. What are the incremental lines for dentin?
The enamel organ is compressed
Dentin and alveolar bone
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Imbrication lines of von Ebner

41. What is the main process involved in the bud stage?
Trauma - pressure or metabolic disease
Proliferation
Oral epithelium
Epithelial

42. What is enamel dysplasia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Faulty development of enamel from interference involving ameloblasts
Development of one or more extra teeth
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

43. What are the clinical ramifications of enamel pearl?
Imbrication lines of von Ebner
May be confused as calculus deposit on root
A bilayer rim that consists only IEE and OEE
Displacement of ameloblasts to root surface

44. Tooth development
Osteocytes
Enamel organ
Odontogenesis
It disintegrates as the developing oral mucosa comes to line the oral cavity

45. Where is the dental papilla originally derived from?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Cementoblasts
The actual vertical movement of the tooth
The ectomesenchyme - which was influenced by the neural crest cells

46. What else undergoes proliferation in the bud stage besides the dental lamina?
Dentin and alveolar bone
Trauma - pressure or metabolic disease
The ectomesenchyme
Connective

47. How is the dentinocemental junction formed?
Dental papilla
Hereditary in localized form. endocrine dysfunction is complete
As a result of the apposition of cementum over dentin
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

48. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Cementoblasts
The outer cells of the dental papilla and the central cells of the dental papilla
The enamel organ - dental papilla - dental sac
There is unequal growth in different parts of the tooth bud

49. What are supernumerary teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The dental lamina
Induction - proliferation
Development of one or more extra teeth

50. What wll the inner enamel epithelium differentiate into?
Apposition of the cementum
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The ameloblasts place an acellular dental cuticle on the new enamel surface
Enamel secreting cells (ameloblasts)