Mixed Dentition Analysis

Moyer’s Analysis In Mixed Dentition

Mixed dentition analysis measures the amount of space available in an arch for the eruption of permanent canines and premolars.

During the mixed dentition stage, the permanent teeth are not fully erupted, so for the estimation of unerupted permanent teeth, mixed dentition analysis is carried out.
Mixed dentition analysis aims to compare the space available for unerupted permanent canines and premolars with the space needed, the difference between both provides the orthodontist with the amount of spacing and crowding that is expected.

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Following is the mixed dentition analysis, i.e.
- Moyer’s mixed dentition analysis
- Tanaka-Johnston analysis
- Staley and Kerber’s analysis
- Radiographic method.

Mixed Dentition Analysis Techniques

Moyer’s mixed analysis calculates the amount of space available in the arch for succedaneous permanent teeth as well as necessary occlusal adjustments.
Tanaka-Johnston’s analysis evaluates the width of unerupted canines and premolars, which is based on the sum of the width of mandibular incisors.
As the name determines the radiographic method, radiographs are used. This radiograph evaluates the size of the unerupted tooth by using the following formula:

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Mixed Dentition Analysis Tools

⇒ \(\frac{\mathrm{Y} 1=\mathrm{X}_1 \times \mathrm{Y} 2}{\mathrm{X} 2}\)

Here,

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Hixon-Oldfather Prediction Method

Y1 is the width of the unerupted tooth whose measurement is to be determined.

Y2 is the width of the unerupted tooth on the radiograph.

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Mixed Dentition Space Analysis

X1 is the width of the erupted tooth, which is measured on the cast.

X2 is the width of the erupted tooth, which is measured on the radiograph.

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