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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 will the inner cells of the dental lamina differentiates into?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The primordium of the pulp
Induction
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

2. Passive eruption
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
When the gingiva recedes and no actual tooth movement takes place
Hereditary
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

3. What are the formative cells for dentin?
Future dentin and pulp tissue
The cementum - PDL - and alveolar bone
Odontoblasts
Enamel pearl - enamel dysplasia - and concresence

4. What is dens in dente?
The ameloblasts
The outer cells of the dental papilla and the central cells of the dental papilla
Into odontoblasts
Enamel organ invaginates into the dental papilla

5. What is the site for the future dentioenamel junction?
Local or systemic or hereditary
Osteoblasts
The basement membrane that seperates the enamel organ and dental papilla
A bilayer rim that consists only IEE and OEE

6. What is gemination?
Inner
Tooth germ tries to divide
Future dentin and pulp tissue
Hereditary

7. What are the clinical ramifications of enamel pearl?
Enamel organ
May be confused as calculus deposit on root
Trauma - pressure or metabolic disease
The basement membrane that seperates the enamel organ and dental papilla

8. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Bud stage
Tooth germ
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

9. What layer serves as protection for the enamel organ?
The tooth germ
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The outer enamel epithelium

10. What is the cementum matrix called?
Enamel organ invaginates into the dental papilla
Displacement of ameloblasts to root surface
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Cementoid

11. The stellate reticulum is located inner or outer?
Cementocytes
Outer
Lines of Retzuis
Hereditary in localized form. endocrine dysfunction is complete

12. Active eruption
Local or systemic or hereditary
Abnormally large 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.
The actual vertical movement of the tooth

13. What are the mature cells for cementum?
Cementocytes
In the cap stage
Lines of Retzuis
May be confused as calculus deposit on root

14. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
Commonly involves permanent maxillary lateral incisor and 3rd molars
Local or systemic or hereditary
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

15. What are the processes involved in the cap stage?
The stellate reticulum
Arrest and reversal lines
Common on permanent molars or cingulum of anterior teeth
Proliferation - differentiation - morphogenesis

16. What are the development disturbances of the apposition and maturation stages?
Into odontoblasts
During the cap stage
The primordium of the pulp
Enamel pearl - enamel dysplasia - and concresence

17. What happens during the maturation stage?
The basement membrane
Dental tissues fully mineralize to their mature levels.
Epithelial rests of Malassez
Absence of single or multiple teeth

18. What are the formative cells for alveolar bone?
Development of one or more extra teeth
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The dental lamina
Osteoblasts

19. What are the clinical ramifications of concrescence?
Ameloblasts
As a result of the apposition of cementum over dentin
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Common with permanent maxillary molars

20. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
Commonly involves permanent maxillary lateral incisor and 3rd molars
Enamel organ invaginates into the dental papilla
Dentin and alveolar bone

21. What do the odontoblasts do?
Dental papilla
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Common on permanent molars or cingulum of anterior teeth
A bilayer rim that consists only IEE and OEE

22. In the cap stage the tooth bud does not grow - what happens?
Cementocytes
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
There is unequal growth in different parts of the tooth bud
The permanent molars

23. What happens during initiation?
The permanent 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
The bud stage
Osteocytes

24. When does the process of root development take place?
Preameloblasts
Outer
The outer cells of the dental papilla and the central cells of the dental papilla
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

25. What stage does anodontia occur?
Enamel
Initiation stage
Displacement of ameloblasts to root surface
Common with permanent maxillary molars

26. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dens in dente - gemination - tubercle - and fusion
Epithelial rests of Malassez
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

27. What stage does the dental tissues subsequently fully mineralize
Connective
Maturation
Commonly involves permanent maxillary lateral incisor and 3rd molars
There are none - they are lost with eruption

28. What are the mature cells for alveolar bone?
Osteocytes
Trauma - pressure or metabolic disease
Union of root structure of two or more teeth by cementum
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

29. What else undergoes proliferation in the bud stage besides the dental lamina?
The ectomesenchyme
Apposition of the cementum
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

30. When does dens in dente occur?
The dental lamina
During the cap stage
Dental follicle
Cementoblasts

31. The stratum intermediate is located inner or outer?
Connective
Tall columnar cells
The ameloblasts
Inner

32. Where is the enamal organ originally derived from?
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
The basement membrane that seperates the enamel organ and dental papilla
The ectoderm
In the cap stage

33. What will the outer cells of the dental lamina differentiate into?
Enamel secreting cells (ameloblasts)
Bud stage
Dentin secreting cells (odontoblats)
The bud stage

34. What are the clinical ramifications of supernumerary teeth?
11th to 12th weeks
Dental papilla
Arrest and reversal lines
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

35. What happens when the reduced enamel epithelium is created?
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 ectomesenchyme - which was influenced by the neural crest cells
Odontoclasts
Epithelial rests of Malassez

36. What are the etiological factors for fusion?
Pressure on the area
Lines of Retzuis
As a result of the apposition of cementum over dentin
Cuboidal cells

37. What is the main process involved in the bud stage?
Maturation
The enamel - dentin - and cementum are secreted in successive layers
Proliferation
Cementoblasts

38. What are the clinical ramifications of anodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The outer cells of the dental papilla and the central cells of the dental papilla
When the gingiva recedes and no actual tooth movement takes place
Pressure on the area

39. What is the predominate process of the cap stage?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Morphogenesis
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
There are none - they are lost with eruption

40. What are the etiological factors of tubercle?
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
Trauma - pressure or metabolic disease
A bilayer rim that consists only IEE and OEE

41. What is the time span for the bell stage?
Cuboidal cells
Enamel secreting cells (ameloblasts)
11th to 12th weeks
Union of 2 adjacent tooth germs

42. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Cementoblasts
Traumatic injury or crowding of teeth
Dental tissues fully mineralize to their mature levels.

43. What are the incremental lines for dentin?
11th to 12th weeks
Imbrication lines of von Ebner
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The enamel organ is compressed

44. What is cementogenisis?
Outer
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The enamel - dentin - and cementum are secreted in successive layers
Apposition of the cementum

45. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
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
The ectomesenchyme
Development of one or more extra teeth

46. What are the clinical ramifications of micro/macrodontia?
Abnormally large teeth
It disintegrates as the developing oral mucosa comes to line the oral cavity
Commonly involves permanent maxillary lateral incisor and 3rd molars
Preameloblasts

47. What is the time span for the cap stage?
Sphere of enamel on root
4 types
9th to 10th weeks
As a result of the apposition of cementum over dentin

48. What are the incremental lines for cementum and alveolar bone?
The ectomesenchyme - which was influenced by the neural crest cells
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The primordium of the pulp
Arrest and reversal lines

49. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Maturation
Enamel organ
The ameloblasts
Faulty development of enamel from interference involving ameloblasts

50. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Apposition of the cementum
The basement membrane
Differentiation
Lines of Retzuis