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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 is the cementum matrix called?
Tooth germ tries to divide
Faulty development of enamel from interference involving ameloblasts
Abnormally large teeth
Cementoid

2. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

3. What are the etiological factors for micro/macrodontia?
Development of one or more extra teeth
Hereditary in localized form. endocrine dysfunction is complete
The outer cells of the dental papilla and the central cells of the dental papilla
The ectomesenchyme

4. What are supernumerary teeth?
Extra cusp due to effects on enamel organ
Development of one or more extra teeth
Osteocytes
Alveolar bone

5. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
Dentin and alveolar bone
Cementocytes
The apposition of the enamel matrix

6. What happens during initiation?
Enamel pearl - enamel dysplasia - and concresence
Future dentin and pulp tissue
Epithelial rests of Malassez
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

7. Where is the enamal organ originally derived from?
Induction
The cementum - PDL - and alveolar bone
Cementoblasts
The ectoderm

8. What are the etiological factors of enamel dysplasia?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Local or systemic or hereditary
When the gingiva recedes and no actual tooth movement takes place
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.

9. What are succedaneous teeth?
The actual vertical movement of the tooth
Initiation stage
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The bud stage

10. Passive eruption
Alveolar bone
The ameloblasts place an acellular dental cuticle on the new enamel surface
There is unequal growth in different parts of the tooth bud
When the gingiva recedes and no actual tooth movement takes place

11. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The bud stage
Dental papilla
Sphere of enamel on root
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

12. What does the cervical loop consist of?
The ectomesenchyme
The dental sac
A bilayer rim that consists only IEE and OEE
4 types

13. What is cementogenisis?
Connective
The tooth germ
Apposition of the cementum
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

14. What are the clinical ramifications of enamel pearl?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Enamel organ
May be confused as calculus deposit on root
The enamel organ

15. What are entrapped cementoblasts called?
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
Tooth germ tries to divide
The enamel organ - dental papilla - dental sac
Cementocytes

16. What type of tissue is enamel?
Abnormally large teeth
Epithelial
Extra cusp due to effects on enamel organ
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

17. How many types of cells are found in the enamel organ in the bell stage?
Odontogenesis
Differentiation - proliferation - morphogenesis
4 types
Cementoblasts

18. What are the etiological factors for anodontia?
Union of 2 adjacent tooth germs
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Tall columnar cells
The enamel - dentin - and cementum are secreted in successive layers

19. What are the mature cells for cementum?
Cuboidal cells
Absence of single or multiple teeth
Cementocytes
Morphogenesis

20. What stage does supernumerary teeth occur?
Initiation
Epithelial
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Cuboidal cells

21. What is concrescence?
The basement membrane
Initiation
Outer
Union of root structure of two or more teeth by cementum

22. What will the outer cells of the dental lamina differentiate into?
A bilayer rim that consists only IEE and OEE
The ectoderm
Dentin secreting cells (odontoblats)
Commonly involves permanent maxillary lateral incisor and 3rd molars

23. What are the mature cells for alveolar bone?
The outer enamel epithelium
Osteocytes
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dental papilla

24. What hard tissue is can not have tissue formation after eruption?
Cementoblasts
Abnormally small teeth
Enamel
The enamel - dentin - and cementum are secreted in successive layers

25. What is the predominate process of the cap stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
6th to 7th weeks
Morphogenesis
Osteoblasts

26. What stage does anodontia occur?
Initiation stage
Connective
Imbrication lines of von Ebner
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

27. What stage does the dental tissues subsequently fully mineralize
Maturation
The ectomesenchyme
The tooth germ
Tooth germ tries to divide

28. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Differentiation
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 basement membrane

29. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
As a result of the apposition of cementum over dentin
The basement membrane
Trauma - pressure or metabolic disease
The ameloblasts

30. What is the outer portion of the ectoderm in the initiation stage?
Displacement of ameloblasts to root surface
Cuboidal cells
8th week
Oral epithelium

31. What are the etiological factors for fusion?
Faulty development of enamel from interference involving ameloblasts
Pressure on the area
Arrest and reversal lines
6th to 7th weeks

32. What processes are involved in the bell stage?
The bud stage
Into odontoblasts
Differentiation - proliferation - morphogenesis
Odontoblasts

33. Tooth development
Odontogenesis
Cementoid
The enamel organ - dental papilla - dental sac
6th to 7th weeks

34. What will the dental papilla eventually form?
In the cap stage
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Future dentin and pulp tissue
Sphere of enamel on root

35. What is the time span for the bell stage?
11th to 12th weeks
Cementoid
9th to 10th weeks
The dental sac

36. What are the clinical ramifications of enamel dysplasia?
The cervical loop
The enamel organ - dental papilla - dental sac
The ectomesenchyme
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

37. What hard tissue has vascularity?
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
Alveolar bone
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

38. What are the incremental lines for dentin?
The enamel - dentin - and cementum are secreted in successive layers
9th to 10th weeks
Induction
Imbrication lines of von Ebner

39. What is the process involved in the maturation stage?
Connective
Maturation
6th to 7th weeks
Cementoblasts

40. What is an enamel pearl?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Sphere of enamel on root
The enamel - dentin - and cementum are secreted in successive layers
Induction

41. What are the clinical ramifications of concrescence?
The enamel organ is compressed
Cementoblasts
The stellate reticulum
Common with permanent maxillary molars

42. What is gemination?
Tooth germ tries to divide
Osteoblasts
The cementum - PDL - and alveolar bone
Abnormally large teeth

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

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44. Which layer in the bell stage has star shaped cells?
The primordium of the pulp
Dentin secreting cells (odontoblats)
The stellate reticulum
Pressure on the area

45. What is tubercle?
Dens in dente - gemination - tubercle - and fusion
Morphogenesis
Future dentin and pulp tissue
Extra cusp due to effects on enamel organ

46. The preameloblasts induce dental papilla cells to differentiate into what?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Cementoblasts
Traumatic injury or crowding of teeth
Into odontoblasts

47. What are the clinical ramifications of gemination?

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48. What is the site for the future dentioenamel junction?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The basement membrane that seperates the enamel organ and dental papilla
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The basement membrane

49. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Development of one or more extra teeth
Differentiation
The permanent molars
The basement membrane

50. What happens during the cap stage?
There are none - they are lost with eruption
4 types
In the cap stage
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.