Orthodontic Assistant Practice Exam

When ligating with a tie wire, the wire should be bent at what angle?

1. 90-degree angle

2. 45-degree angle

3. 30-degree angle

4. 60-degree angle

The correct answer is: 45-degree angle

Bending the tie wire at a 45-degree angle during the ligation process is ideal because it helps in achieving proper engagement of the wire with the brackets. This angle allows the wire to effectively interact with the bracket slots, providing sufficient force to hold the archwire in place while accommodating the movement of teeth. The 45-degree angle optimizes both stability and flexibility, ensuring that the wire remains securely tied without excessive pressure that could either dislodge the bracket or cause discomfort to the patient. Other angles, such as 90 degrees, would create a sharper turn that could compromise the engagement with the bracket, while angles like 30 degrees or 60 degrees might not provide adequate grip or might apply uneven force, potentially leading to suboptimal treatment outcomes.