BONE GROWTH
 Don’t confuse bone growth with bone formation above
 Growth of bone is by apposition — layer by layer deposition
 Whereas cartilage growth is by two ways one is appositional and other is interstitial method, which is how mandibular condyle grows.
 Mandible growth starts at 6th wk of IUL & completes at 12-13 years
 Individual — 1st bone to ossify — clavicle— entire body
 1st bone to ossify in head — mandible -2nd bone to ossify overall
 Maxilla growth starts after mandible but completes earlier than mandible

Start (6th wk of IUL)----- (MANDIBLE) --------------finish (12-13 years)

-----------------START -------------------FINISH-------------------------

-------------------------------MAXILLA-----------------------------------


MANDIBLE
 Primary cartilage of mandible — Meckel’s cartilage
but it does not individually induce or contribute to
mandibles growth
 Secondary cartilage — condylar cartilage
 This cartilage contributes to its growth*
 Direction of growth — anterior and inferiorly
 Direction of apposition @ condylar — posteriorly and superiorly
 V shape principle- is shown by the mandibular growth

MAXILLA
 Formed entirely by intramembranous ossification
 Growth is by apposition at sutures and surface remodelling
 Direction of growth/migration – downward and forward
 Direction of apposition – downward at alveolar area and at tuberosity area

 MAXILLA IN A NUTSHELL:
o Increases in height by continuous growth at alveolar bone
o Increases in width by mid-palatine suture
o Increases in depth by apposition at anterior region and tuberosity