Negative space with respect to buccal corridors is an indication for

 # Negative space with respect to buccal corridors is an indication for:

A. Intrusion of maxilla

B. Distalization of molar

C. Expansion of arches

D. Constriction of arches

The correct answer is C. Expansion of arches.

Buccal corridor space is defined as visible maxillary dentition width/ Oral aperture width. The buccal corridor is measured from the mesial line angle of the maxillary first premolars to the interior portion of the commissure of the lips. So negative buccal corridor space indicated mesial-distal width of teeth is less or oral aperture is wide; so arch needs expansion.