Applicability Of Pont’s Index In Orthodontics
Pont’s Index
Pont, in 1909, presented a system in which, by the measurement of the four maxillary anterior, the width of the arch in the premolar and molar region was established automatically.
Pont’S Index In Orthodontic Treatment Planning
Pont’s Analysis Helps in:
- Determining whether the dental arch is narrow or normal.
- Determining the need for lateral arch expansion.
- Determining how much expansion is possible at the premolar and molar regions.
Pont’S Index Calculation Guide
Determination of Sum of Incisors (SI)
SI = Mesiodistal width of all four maxillary anterior (incisors).
Determination of Measured Premolar Value (MPV)
Width of dental arch in premolar region from distal pit of fist premolar of one side to distal pit of 1st premolar of opposite side.
Pont’S Index Ethnic Variations
Determination of Measured Molar Value (MMV)
Width of dental arch in molar region from mesial pit of 1st molar on one side to other side.
Determination of Calculated Premolar Value (CPV)
\(\mathrm{CPV}=\frac{\mathrm{SI} \times 100}{80}\)
Pont’S Index In Digital Orthodontics
Determination of Calculated Molar Value (CPV):
\(\frac{S I \times 100}{64}\)
Inference
- If the measured value is less than the calculated value, it indicates the need for extraction.
- Thus, it is possible to determine how much expansion is needed in the molar and the premolar regions.
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