Ortho 1_Su23 Flashcards
Space available is…
mesial of permanent 1st molar to mesial of contralateral permanent 1st molar taken in 4 measurement segments
Space required is…
Mesiodistal width of all teeth 2nd premolar to contralateral 2nd premolar
Effect of leveling curve of spee
Reduction of crowding and reduction of overjet
How to estimate crowding/spacing for unerupted teeth?
Measurement of teeth on radiographs, estimation from proportionality tables, combination
Moyers
Measure total width of permanent mandibular incisors, use table to prdict witdth of permanent canines and premolars
Tanaka/Johnston- unfinished
1/2 width of permanent mandibular incisors + 10.5mm (estimated width of mandibular canines and premolars in 1 quad); 1/2 width of lower incisors +11 is estimated size of maxillary canines and premolars for 1 quad (x2 = space needed for all the canines and premolars in the arch + width of incisors = all the permanent teeth mesial to 1st molars)
Permanent dentition
Measure 4 segmented mesial of 1st molar to 1st molar, then measure mesiodistal width of each tooth, compare for length discrepancy
Management of skeletal malocclusions
growth modification, camouflage, orthognathic surgery, distraction osteogenesis
Skeletal malocclusion
Mx or Md or both are not in the right position
Most common skeletal malocclusion
Class II
Vertical discrepancies lead to…
Open or deep bite
Transverse malocclusions
very common
Mx too narrow
Why is profile analysis harder in kids?
Challenging because children are still growing
Rapid palatal expansion- components
0.5mm/day in 2-3wks
Equal skeletal and dental expansion
Get a space btw central incisors
3 mo retention
Slow palatal expansion
Less than 2mm/week
Equivalent long term results
