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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

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Answer 50 questions in 15 minutes.
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1. What type of tissue is dentin - cementum - and alveolar bone?
May be confused as calculus deposit on root
Maturation
Connective
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

2. What are the clinical ramifications of concrescence?
Common with permanent maxillary 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 basement membrane
Hereditary in localized form. endocrine dysfunction is complete

3. What stage does supernumerary teeth occur?
Cementocytes
There is unequal growth in different parts of the tooth bud
Epithelial rests of Malassez
Initiation

4. What are the clinical ramifications of enamel pearl?
The dental lamina
May be confused as calculus deposit on root
Dental follicle
Dental tissues secreted as matrix in successive layers.

5. Where is the enamal organ originally derived from?
The ectoderm
Dens in dente - gemination - tubercle - and fusion
Union of root structure of two or more teeth by cementum
Dental papilla

6. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Proliferation - differentiation - morphogenesis
The ameloblasts
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

7. Which layer in the bell stage has star shaped cells?
Epithelial
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The stellate reticulum
Odontoblastic process

8. What happens during the bell stage?
Differentiation - proliferation - morphogenesis
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Traumatic injury or crowding of teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

9. Tooth development
Extra cusp due to effects on enamel organ
Odontogenesis
A mineralized cylinder - the dentinal tubule
Dentin and alveolar bone

10. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Osteocytes
Union of root structure of two or more teeth by cementum
Displacement of ameloblasts to root surface

11. What are the development disturbances of the apposition and maturation stages?
Imbrication lines of von Ebner
Preameloblasts
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Enamel pearl - enamel dysplasia - and concresence

12. What are the etiological factors of concrescence?
Pressure on the area
There are none - they are lost with eruption
Traumatic injury or crowding of teeth
Trauma - pressure or metabolic disease

13. What are the formative cells for enamel?
Induction
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Ameloblasts
Faulty development of enamel from interference involving ameloblasts

14. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Union of root structure of two or more teeth by cementum
Displacement of ameloblasts to root surface
Preameloblasts

15. What are the clinical ramifications of gemination?

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16. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
May be confused as calculus deposit on root
Odontoblastic process
A bilayer rim that consists only IEE and OEE
Outer

17. What will the outer cells of the dental lamina differentiate into?
Enamel organ
A mineralized cylinder - the dentinal tubule
Dentin secreting cells (odontoblats)
The stellate reticulum

18. What hard tissue is can not have tissue formation after eruption?
The stellate reticulum
Ameloblasts
The ectomesenchyme
Enamel

19. What do the odontoblasts do?
Enamel
Dental tissues secreted as matrix in successive layers.
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
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

20. In the cap stage the tooth bud does not grow - what happens?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Differentiation - proliferation - morphogenesis
Into odontoblasts
There is unequal growth in different parts of the tooth bud

21. What is the cap in the cap stage?
When the gingiva recedes and no actual tooth movement takes place
The enamel organ
Abnormally large teeth
Hereditary

22. What are the cell layers found in the enamel organ in the bell stage?
Lines of Retzuis
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
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.
Enamel pearl - enamel dysplasia - and concresence

23. What are the formative cells for dentin?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Odontoblasts
The actual vertical movement of the tooth

24. What are the etiological factors for enamel pearl?
Dental papilla
Displacement of ameloblasts to root surface
The ameloblasts
Dental tissues fully mineralize to their mature levels.

25. What stage does anodontia occur?
Osteocytes
6th to 7th weeks
Dental follicle
Initiation stage

26. What are the etiological factors of tubercle?
The cementum - PDL - and alveolar bone
Trauma - pressure or metabolic disease
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
A mineralized cylinder - the dentinal tubule

27. What is tubercle?
Extra cusp due to effects on enamel organ
The bud stage
Maturation
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

28. What is the cementum matrix called?
The stellate reticulum
Cementoid
The dental sac
May be confused as calculus deposit on root

29. What are the etiological factors for fusion?
Cementoid
Abnormally small teeth
Tooth germ tries to divide
Pressure on the area

30. What processes are involved with the apposition stage?
Induction - proliferation
Enamel
A mineralized cylinder - the dentinal tubule
Enamel secreting cells (ameloblasts)

31. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Preameloblasts
There are none - they are lost with eruption
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

32. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The dental sac
The outer cells of the dental papilla and the central cells of the dental papilla

33. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
When the gingiva recedes and no actual tooth movement takes place
9th to 10th weeks
Hereditary in localized form. endocrine dysfunction is complete

34. What are the clinical ramifications of dens in dente?
4 types
Outer
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Union of root structure of two or more teeth by cementum

35. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Dens in dente - gemination - tubercle - and fusion
The basement membrane
Dental papilla
Enamel secreting cells (ameloblasts)

36. When does the tooth bud become a tooth germ?
In the cap stage
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
Compressed layer of flat to cuboidal cells
The ameloblasts place an acellular dental cuticle on the new enamel surface

37. The preameloblasts induce dental papilla cells to differentiate into what?
Odontogenesis
There is unequal growth in different parts of the tooth bud
Epithelial
Into odontoblasts

38. What is cementogenisis?
Epithelial rests of Malassez
Absence of single or multiple teeth
Cementoblasts
Apposition of the cementum

39. What is an enamel pearl?
Maturation
Sphere of enamel on root
The basement membrane that seperates the enamel organ and dental papilla
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

40. What is gemination?
The cervical loop
Tooth germ tries to divide
The tooth germ
Odontoclasts

41. What hard tissue is innervated by nerves?
The tooth germ
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Differentiation - proliferation - morphogenesis
Dentin and alveolar bone

42. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Union of 2 adjacent tooth germs
Dental tissues fully mineralize to their mature levels.

43. What is the outer portion of the ectoderm in the initiation stage?
Odontogenesis
Oral epithelium
The basement membrane that seperates the enamel organ and dental papilla
Hereditary

44. What is the function of the Hertwig's epithelial root sheath?
The enamel organ - dental papilla - dental sac
Induction
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Compressed layer of flat to cuboidal cells

45. 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
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Abnormally small teeth

46. What are the clinical ramifications?
Union of root structure of two or more teeth by cementum
Common on permanent molars or cingulum of anterior teeth
The primordium of the pulp
Osteoblasts

47. What processes are involved in the bell stage?
The outer enamel epithelium
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.
Enamel pearl - enamel dysplasia - and concresence
Differentiation - proliferation - morphogenesis

48. What will the dental papilla eventually form?
Union of 2 adjacent tooth germs
The enamel organ
Connective
Future dentin and pulp tissue

49. What are the incremental lines for enamel?
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.
Lines of Retzuis
11th to 12th weeks
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

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

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