EXAM exam
- Advantages of Tanaka and Johnston method
- requires no radiographs
- requires no lengthy prediction tables, graphs or equations
- can be used in both arches
- reasonably accurate
- Assumptions in the Tanaka and Johnston method
- There is a correlation between the size of the erupted mandibular sizes and the unerupted succedaneous teeth
- the prediction tables were valid for your patient
- arch dimensions do not change appreciably during growth (incisors stable)
- The amount of mesial shift is predictable
- all succedaneous teeth are developing normally
Lower incisors
For predictions for lower OR upper arch always use the lower incisors they are the best reference point and the most stable
Bolton analysis charts exam
- you’re not expected to memorize the table just know the 77.2%
- know that it brings the mismatch of hte tooth size between the upper and lower arch, and based on this ratio you can see clinically if you have an excess or not
Arch form exam
- Constricted, Narrow or V shaped
- different arch form types:
- tapered
- square
- ovoid
Cast analysis exam Anterior-posterior relatoinships exam Transverse Relationships exam
- Relative arch widths
- narrow (constricted)
- normal
- wide
- Crossbites
- Buccal
- lingual
- Bilateral or unilateral Vertical relationships exam non-exam:
- Boley gauge
Leeway space: 0 the size differential between the primary posterior teeth (get picture from ZAK)