The characteristic feature of Brader arch form is:

 # The characteristic feature of Brader arch form is:

A. Resembles metal chain hanging from two ends

B. Expanded in second molar region

C. Constricted in second molar region

D. Offsets in premolar region are present

The correct answer is C. Constricted in the second molar region.

Brader arch form: 

• Based on a trifocal ellipse 

• Trifocal ellipse almost the same wide as the catenary curve anterior segment 

• It has a somewhat wider premolar segment than the catenary curve 

• In the posterior segment trifocal ellipse constricts gradually while catenary curve does not 

• This arch form is more constricted or closely approximate at 2nd & 3rd molars