Model Analysis
Question 1. Write a short note on Nance’s analysis.
Answer.
“Steps to explain different types of orthodontic model analysis: Manual vs digital: Q&A guide”
- Carey’s analysis helps in determining the extent of the discrepancy.
- Many malocclusions occur as a result of a discrepancy between arch length and tooth material.
- It is performed on a lower cast.
- If the space required is less than the space available, spacing occurs.
- If the space required is more than the space available, crowding occurs.
So, it is important to determine the total amount of crowding in patients with malaligned teeth.
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Determination of Arch Length
- Arch length anterior to the first permanent molar is measured using a soft brass wire.
- The wire is placed contacting the mesial surface of the first molar (permanent) of one side and passed over the buccal cusps of the premolars and along the anterior and is continued on the opposite side in the same way up to the mesial surface of the opposite fist permanent molar.
- If interiors are proclined, the wire is passed along the cingulum of the anterior teeth.
- If the anterior is reclined, the wire in the anterior segment passes labial to the teeth.
- If the anterior teeth are well aligned, the wire passes over the incisal edge of the anterior.
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Determination of Tooth Material
The mesiodistal width of the teeth anterior to the first molars (from 2nd premolar to 2nd premolar) is measured separately and summed up.
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Determination of Discrepancy
Discrepancy = arch length-tooth material.
Carey’s Analysis Inference
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