iDENTical The Development of Upper & Lower Jaw Models

iDENTical The Development of Upper & Lower Jaw Models

• Maxilla is a membranous bone and development/growth of maxilla is completed early & when compared to mandible.
• Maxilla (width) follows closely neural growth curve more than the general growth curve in scammon’s curve

GROWTH OF MAXILLA ALONG WITH NASOMAXILLARY COMPLEX:

• Displacement
• Growth at sutures
• Surface remodelling

2 Basic growth movements:

Combination of simulatneous deposition and resorption resulting in a growth movements towards the depositing surface which has been described as cortical drift Enlow

Primary displacement (translation):

is the movement of bone due to its bone growth.

This results in the whole maxilla being carried anteriorly as the bone is displaced by its own enlargement

Passive or Secondary displacement occurs in a downward or forward direction as the cranial base grows

GROWTH SITE OF MANDIBLE:

• The mandible,at Birth is small, with short ramus,large gonial angle, and flat
• mandibular fossa with no articular eminence.The condyles are at the level of the occlusal plane.
• It appears as if mandibular growth is forward and downwards, and as such one could suppose that the mandible enlarges by growth at the anterior end