Dinensional Changes Of Dental Arch Flashcards
Dental arch define.
The measurement through the contact point of teeth
Define the alveolar arch.
The measurement of the arch of the alveolar process
Affected by orthodontic movement
Teeth cannot move beyond limits of bone
Basal arch
The measurement of apical base arch
when does the Late mesial shift occur?
Occurs 11-14 years
what is the most important dimension
Arch perimeter
Arch depth (length)
Little clinical significance
Reflects circumferential changes
To measure it used the Midline between central incisors tangent distal of primary 2nd molars or premolars
intercanine width is increased how
it is slightly increase due to distal tipping of primary canines into primate space while mandibular permanent incisors erupt
overbite is correlated to
vertical facial dimensions
overjet influenced by
lip , tongue function and digit habits
overjet correlated to
anterio posterior skeletal relationship
Late lower incisor crowding (tertiary crowding)
One of the most common problems
occurs both in adolescence& post adolescence
High relapse Rate
What is the consequences if tertiary crowding is not treated?
Increase crowding
Width and length decrease
what are the 3 theories of Late lower incisor (teirtiary)
Lack of “ normal attrition “ in the modern diet
pressure from 3rd molar
Late Mandibular growth:
displaces lower incisors lingually
Why does root resorption happen during orthodontic treatment
Movement of teeth back and forth by orthodontic appliances
Duration of treatment
Correction of impacted cuspid
Ectopic teeth
teeth that erupt away from their normal position
