GROWTH OF MANDIBLE

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INDIAN DENTAL ACADEMY
Leader in continuing dental education
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GROWTH OF MANDIBLE

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PRE NATAL GROWTH OF
MANDIBLE
 EMBRYONAL

 FETAL

PERIOD

PERIOD

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FETAL PERIOD
The alveolar plate lengthens more rapidly than does the
ramus
 The ratio of the alveolar plate length to tot...
STRUCTURES RELATED TO
DEVELOPING MANDIBLE
 INFERIOR

DENTAL NERVE

 MECKEL’S
 TOOTH

CARTILAGE

GERMS

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DEVELOPMENTAL ELEMENTS
RELATED TO THE MANDIBLE
 NEURAL
 ALVEOLAR
 RAMAL
 MUSCULAR
 CARTILAGENOUS

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DEVELOPMENT OF THE
MANDIBLE

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ANATOMY OF THE MANDIBLE

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MEDIAL ASPECT

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LINGUAL VIEW

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SKELETAL UNITS

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TEMPORALIS MUSCLE

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MUSCLES OF THE TMJ

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PRIMARY &SECONDARY
CARTILAGE

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Variation in tissue arrangement
adjacent to endochondral bone
formation

a.bone
b.prechondroblasts
c.chondroblasts
d.resti...
CONDYLAR CARTILAGE
a.
b.

c.
d.

Capsular layer(densely
fibrous)
Layer of
prechondroblastic cellscellular proliferation
Ne...
CONDYLAR REMODELLING







PERIOSTEAL
RESORPION
ENDOSTEAL
DEPOSITION
CONDYLE MOVES IN A
SUPEROPOSTERIOR
COURSE
NECK ...
ENLOW’S “V” PRINCIPLE

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CONDYLAR RESECTION IN RHESUS
MONKEY










Facial height is less in A than
in B
Accentuation of anti gonial
notch
...
OSTEOCHONDRAL RIB
TRANSPLANT




Each precursor chondroblast
divides 35-50 times
Each progenitor chondroblast
divides 8-...


The chondroblasts issuing
from a progenitor
chondroblast produce a
pyramid-like structure that
is a component of the
pr...
RIB TRANSPLANT EXPERIMENT
OBSERVATIONS

Intracellular concentrations of Na+ tended to decrease
 Intracellular concentrati...
Differentiation rate of the precursor chondroblast
into progenitor chondroblast is submitted not only
to the command repre...
Sectioning of mandible into parts for study

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TRANSVERSE SECTION OF CONDYLAR
NECK
Lingual surface A has received
periosteal deposits
 B is composed of endosteal
compac...
Remodelling Process

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Coronoid Process & Ramus

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Remodelling at the lingual tuberosity

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The posterior growth of the
tuberosity is accomplised
by continued new deposits
of bone on its posteriorfacing exposure.
P...
LOGARITHMIC CURVE FOR
MANDIBULAR GROWTH

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CONCLUSION
The spatial movements of the mandible, and of the mental
foramen, related to the “rotation” of this logarithmic...
RAT INCISORS

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Logarithmic spiral applied to rat
incisors

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OSTEOCLAST

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

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AGE CHANGES IN THE MANDIBLE

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Thank you
www.indiandentalacademy.com
Leader in continuing dental education

www.indiandentalacademy.com
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Growth of mandible /certified fixed orthodontic courses by Indian dental academy

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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.


Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
00919248678078

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Growth of mandible /certified fixed orthodontic courses by Indian dental academy

  1. 1. GROWTH OF MANDIBLE www.indiandentalacademy.com
  2. 2. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  3. 3. GROWTH OF MANDIBLE www.indiandentalacademy.com
  4. 4. PRE NATAL GROWTH OF MANDIBLE  EMBRYONAL  FETAL PERIOD PERIOD www.indiandentalacademy.com
  5. 5. FETAL PERIOD The alveolar plate lengthens more rapidly than does the ramus  The ratio of the alveolar plate length to total mandibular length is reasonably constant  The width of the alveolar plate shows a more rapid increase than does total width  The ratio of the width between the mandibular angle to total width is relatively constant during fetal life  www.indiandentalacademy.com
  6. 6. STRUCTURES RELATED TO DEVELOPING MANDIBLE  INFERIOR DENTAL NERVE  MECKEL’S  TOOTH CARTILAGE GERMS www.indiandentalacademy.com
  7. 7. DEVELOPMENTAL ELEMENTS RELATED TO THE MANDIBLE  NEURAL  ALVEOLAR  RAMAL  MUSCULAR  CARTILAGENOUS www.indiandentalacademy.com
  8. 8. DEVELOPMENT OF THE MANDIBLE www.indiandentalacademy.com
  9. 9. www.indiandentalacademy.com
  10. 10. www.indiandentalacademy.com
  11. 11. ANATOMY OF THE MANDIBLE www.indiandentalacademy.com
  12. 12. MEDIAL ASPECT www.indiandentalacademy.com
  13. 13. LINGUAL VIEW www.indiandentalacademy.com
  14. 14. www.indiandentalacademy.com
  15. 15. www.indiandentalacademy.com
  16. 16. SKELETAL UNITS www.indiandentalacademy.com
  17. 17. TEMPORALIS MUSCLE www.indiandentalacademy.com
  18. 18. www.indiandentalacademy.com
  19. 19. www.indiandentalacademy.com
  20. 20. www.indiandentalacademy.com
  21. 21. www.indiandentalacademy.com
  22. 22. www.indiandentalacademy.com
  23. 23. www.indiandentalacademy.com
  24. 24. MUSCLES OF THE TMJ www.indiandentalacademy.com
  25. 25. www.indiandentalacademy.com
  26. 26. www.indiandentalacademy.com
  27. 27. www.indiandentalacademy.com
  28. 28. PRIMARY &SECONDARY CARTILAGE www.indiandentalacademy.com
  29. 29. Variation in tissue arrangement adjacent to endochondral bone formation a.bone b.prechondroblasts c.chondroblasts d.resting cartilage e.mature cartilage f.transitional zone g.dense fibrous connective tissue h.bone & marrow of epiphysis i. Articular cartilage www.indiandentalacademy.com
  30. 30. CONDYLAR CARTILAGE a. b. c. d. Capsular layer(densely fibrous) Layer of prechondroblastic cellscellular proliferation New developing cartilage Continually forming endochondral bone www.indiandentalacademy.com
  31. 31. CONDYLAR REMODELLING      PERIOSTEAL RESORPION ENDOSTEAL DEPOSITION CONDYLE MOVES IN A SUPEROPOSTERIOR COURSE NECK IS NARROWED DOWN NECK IS LOCATED IN POSITION OF CONDYLE www.indiandentalacademy.com
  32. 32. ENLOW’S “V” PRINCIPLE www.indiandentalacademy.com
  33. 33. CONDYLAR RESECTION IN RHESUS MONKEY      Facial height is less in A than in B Accentuation of anti gonial notch Shorter,wide anteriorly positioned ramus Larger and heavier coronoid process Reduced facial height on operated side www.indiandentalacademy.com
  34. 34. OSTEOCHONDRAL RIB TRANSPLANT   Each precursor chondroblast divides 35-50 times Each progenitor chondroblast divides 8-11 times www.indiandentalacademy.com
  35. 35.  The chondroblasts issuing from a progenitor chondroblast produce a pyramid-like structure that is a component of the primary growth cartilage of the rib www.indiandentalacademy.com
  36. 36. RIB TRANSPLANT EXPERIMENT OBSERVATIONS Intracellular concentrations of Na+ tended to decrease  Intracellular concentrations of Ca++ & H+ ions tended to increase  Intracellular pH was lowered  Na+ & K+ -ATPase activity was intensified  Ca++, Mg++ - ATPase ,and H+ - ATPase activities were diminished  The numbers of cell divisions declined slightly and demonstrated a significant slowing of growth rate  Similar variations were observed in condylar cartilage of rats and humans www.indiandentalacademy.com 
  37. 37. Differentiation rate of the precursor chondroblast into progenitor chondroblast is submitted not only to the command represented by genetic,hormonal, humoral factors but also to epigenetic biomechanic factors Also autologous osteochondral rib transplant is preferable in treatment of TMJ ankylosis than metatarsal cartilage transplant www.indiandentalacademy.com
  38. 38. Sectioning of mandible into parts for study www.indiandentalacademy.com
  39. 39. TRANSVERSE SECTION OF CONDYLAR NECK Lingual surface A has received periosteal deposits  B is composed of endosteal compacted cancellous bone produced during condylar neck reduction  C has received periosteal depositsas post.border of neck grows in post.direction  D buccal area growing in endosteal direction lller to B  E is undergoing resorption as ant.part of neck grows in a www.indiandentalacademy.com cephalic direction towards side A 
  40. 40. Remodelling Process www.indiandentalacademy.com
  41. 41. Coronoid Process & Ramus www.indiandentalacademy.com
  42. 42. Remodelling at the lingual tuberosity www.indiandentalacademy.com
  43. 43. The posterior growth of the tuberosity is accomplised by continued new deposits of bone on its posteriorfacing exposure. Part of the ramus just behind the tuberosity remodels medially www.indiandentalacademy.com
  44. 44. LOGARITHMIC CURVE FOR MANDIBULAR GROWTH www.indiandentalacademy.com
  45. 45. CONCLUSION The spatial movements of the mandible, and of the mental foramen, related to the “rotation” of this logarithmic spiral are clear indications of the passive translation of the macro-skeletal unit within the expanding oro-facial capsule,which is a response to the primary morphogenetic enlargement of the oro-nasal functioning spaces. The posterior and upward movements of the mandibular foramen ,on the other hand, accurately reflect the active transformative growth changes of the several mandibular microskeletal units due to deposition and resorption of bone brought about www.indiandentalacademy.com periosteal matrices by the action of
  46. 46. RAT INCISORS www.indiandentalacademy.com
  47. 47. Logarithmic spiral applied to rat incisors www.indiandentalacademy.com
  48. 48. OSTEOCLAST www.indiandentalacademy.com
  49. 49. www.indiandentalacademy.com
  50. 50. www.indiandentalacademy.com
  51. 51. www.indiandentalacademy.com
  52. 52. www.indiandentalacademy.com
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  56. 56. www.indiandentalacademy.com
  57. 57.  www.indiandentalacademy.com
  58. 58. www.indiandentalacademy.com
  59. 59. www.indiandentalacademy.com
  60. 60. www.indiandentalacademy.com
  61. 61. AGE CHANGES IN THE MANDIBLE www.indiandentalacademy.com
  62. 62. Thank you www.indiandentalacademy.com Leader in continuing dental education www.indiandentalacademy.com

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