ABO ABO Orthodontic Appliances and Mechanics

Question 1

Which bracket prescription is characterized by built-in torque, tip, and in-out values to reduce the need for wire bending?

Accepted Answer

Preadjusted edgewise bracket

Answer

Begg bracket

Answer

Edgewise bracket

Answer

Ribbon arch bracket

Question 2

What is the primary purpose of a transpalatal arch (TPA) in orthodontic treatment?

Accepted Answer

To maintain molar width and prevent molar rotation

Answer

To advance the mandible

Answer

To expand the maxillary arch

Answer

To intrude the upper incisors

Question 3

In the Tip-Edge bracket system, teeth are allowed to tip freely in which phase?

Accepted Answer

Initial leveling phase

Answer

Finishing phase

Answer

Detailing phase

Answer

Retention phase

Question 4

Which type of headgear produces the greatest restriction of maxillary forward growth?

Accepted Answer

High-pull headgear

Answer

Cervical-pull headgear

Answer

Straight-pull headgear

Answer

Reverse-pull (facemask) headgear

Question 5

What is the function of a Nance holding arch?

Accepted Answer

To prevent mesial drift of upper molars after premolar extraction

Answer

To distalize upper molars

Answer

To correct a posterior crossbite

Answer

To retract the upper anterior teeth

Question 6

Which auxiliary is most commonly used on an edgewise appliance to produce root torque in the upper incisor region?

Accepted Answer

Utility arch

Answer

Lingual arch

Answer

Torquing auxiliary

Answer

Reverse curve of Spee wire