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Bolton Analysis

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Page 1: Bolton Analysis

Bolton Analysis

Page 2: Bolton Analysis

The Bolton Analysis

• Determines the ratio of the mesiodistal widths of the maxillary versus the mandibular teeth (i.e., tooth size discrepancy)

• On account of the importance for the canine relation as well as for overbite and overjet relationship

Page 3: Bolton Analysis

Overall Ratio

• The relationship of the 12 mandibular teeth to the 12 maxillary teeth is assessed

• Second and third molars are exclude

Overall ratio = Sum mand 12 (m-d) x 100Sum max 12 (m-d)

Page 4: Bolton Analysis

• If the calculated ratio is greater than 91,3 %, the mandibular teeth are too wide compared to the maxillary teeth

• If the ratio is reduced, the maxillary teeth are relatively too large

Page 5: Bolton Analysis

Anterior Ratio

• Further analysis is performed to evaluate the ratio between the six upper and lower anterior teeth

Anterior ratio = Sum mand 6 (m-d) x 100Sum max 6 (m-d)

Page 6: Bolton Analysis

• If the ratio is greater than 77,2% the total width of the lower six anterior teeth is relatively too large

• If the index value is reduced, the discrepancy is due to an excess in maxillary tooth material

Page 7: Bolton Analysis

• It is postulated that the relatively smaller tooth material is the correct one

• Disharmony between the width of upper and lower teeth can be improved by1. extractions2. interdental stripping3. in extreme cases, by increasing the mesiodistal tooth size

Page 8: Bolton Analysis

Bolton Table

Page 9: Bolton Analysis