mandibular growth

Question 1

how does the ramus undergo drift? what does this allow for?

Answer 1

apposition at the posterior portion and resorbtion at the anterior
allows for the eruption of the molars as we grow (6, 12, 18)

Question 2

mandibular displacement from the cranium

Answer 2

occurs in an inferior anterior direction

Question 3

which demenison grows the most on the mandible?

Answer 3

mainly vertical

Question 4

mandibular process from which BA?

Answer 4

first BA

Question 5

meckels cartilage

Answer 5

from PA1

hyaline cartilage formed in the first BA of vertebrates, gives rise to mandible (and more)

Question 6

meckels cartialge elongation direction

Answer 6

occurs in a posterior direction

Question 7

initial site of osteogenesis for mandible

Answer 7

occurs at the site of the mental nn

will allow for apposition of bone to from jawline and growth in the dentoalveolar directions

Question 8

Mandibular Alveolar process growth

Answer 8

• Tied to dental eruption: cancellous bone forms btwn teeth
• Significant vertical development.
• Takes place above the mandibular canal

Question 9

growth patterns seen in the mandible

Answer 9

• Cartilage growth (Condyles)
• Alveolar growth (dental eruption)
• Remodeling by bone apposition and resorption

Question 10

Cartilage growth (Condyles) responsive to?

Answer 10

genetically driven, may respond to environmental factors

Question 11

Alveolar growth (dental eruption)

Answer 11

responsive to the eruption of teeth in both 1 and 2 dentition
will form the occlusal plane with the maxilla
responsible for vertical growth

Question 12

resorbtion and apposition in the mandible

Answer 12

seen at the ramus, anterior will resorb and posterior apposition for eruption of molars

Question 13

where does mandible elongation mainly occur?

Answer 13

condyles

Question 14

can we predict size of mandible at age of 12?

Answer 14

NO, Weak correlation form the size of mandible at 12 and the final size ( too much variation) . Same for the shape of the face.
usually large growth of mandible from 11-14

Question 15

Elongation of the mandible

Answer 15

• Apposition and Displacement occur to elongate the mandible so it can “catch up”, at birth we are retrognathic
A/R>1, so more apposition for growth

Question 16

Mandibular lengthening, condyles displaced in which direction?

Answer 16

condyles are displaced towards the posterior

Question 17

Vertical and transverse

growth of the ramus

Answer 17

• V of Enlow
• The vertical growth is the “result” of the vertical displacement of the maxilla.
• Occurs at the same time and must be timed with tooth eruption.

Question 18

Vertical Displacement of the rami, direction/amount?

influences?

Answer 18

variable direction and amount which will influence the final position in X-Y and facial form

Question 19

transverse displacement of the rami

Answer 19

due to enlow’s v

Question 20

Condyles as a cornucopia

tension/compression?

Answer 20

Regional field of growth which can be mechanically stimulated unlike long bones

tension: will enhance growth
compression: stunts growth

Question 21

Condylar growth mechanisms

Answer 21

•Endochondral growth is present but only at the articular surface of the condyle because of compressive load: genetically determined

functional stimulations could influence condylar growth in areas outside this

Question 22

condylar growth rate variations

Answer 22

rates of growth can vary greatly from year to year, should not assume an average rate of growth