ABO Orthodontic Appliances and Mechanics Flashcards
6 cards from real ABO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 ABO Orthodontic Appliances and Mechanics flashcards as text
Which bracket prescription is characterized by built-in torque, tip, and in-out values to reduce the need for wire bending?
Answer: Preadjusted edgewise bracket
The preadjusted edgewise (straight-wire) bracket incorporates built-in torque, tip, and in-out compensations to minimize wire adjustments.
What is the primary purpose of a transpalatal arch (TPA) in orthodontic treatment?
Answer: To maintain molar width and prevent molar rotation
A transpalatal arch connects the upper molars across the palate to maintain their transverse position and prevent unwanted rotation.
In the Tip-Edge bracket system, teeth are allowed to tip freely in which phase?
Answer: Initial leveling phase
During the initial leveling phase of Tip-Edge mechanics, teeth tip freely to correct vertical and horizontal discrepancies before torquing.
Which type of headgear produces the greatest restriction of maxillary forward growth?
Answer: High-pull headgear
High-pull headgear directs force superiorly and posteriorly, providing the greatest restriction on forward maxillary growth.
What is the function of a Nance holding arch?
Answer: To prevent mesial drift of upper molars after premolar extraction
The Nance holding arch uses a palatal button to resist mesial movement of upper molars, preserving space after premolar extraction.
Which auxiliary is most commonly used on an edgewise appliance to produce root torque in the upper incisor region?
Answer: Utility arch
A utility arch bypasses the premolars and canines to apply intrusion and torque forces directly to the incisors.