An 11-year-old boy, Ronald, has an overjet and is being treated by an orthodontist. At a routine appointment, Ronald mentions that he feels some pressure in the area of his maxillary anterior incisors and asks if this is unusual. The orthodontist examines Ronald, makes some adjustments to his appliance, and reviews his radiographs. He informs Ronald that he is pleased with the movement of his teeth and that he may feel occasional pressure throughout treatment. In Ronald's case, each of the following radiographic findings is considered normal during orthodontic treatment EXCEPT one. Which one is the EXCEPTION?
A) Bone remodeling
B) Widening of the PDL
C) Bone resorption
D) Root resorption

Question

Quizplus · Accepted Answer

Radiographic indication of root resorption is not considered a normal occurrence during orthodontic treatment. Root resorption, an irreversible occurrence, is indicative of extreme pressure and force. Bone remodeling is a term used to describe both the breakdown of bone by osteoclasts, which enables teeth to move, as well as the formation of new bone by osteoblasts. During this process the periodontal ligament (PDL) widens in response to pressure as it also undergoes a remodeling process.

An 11-Year-Old Boy, Ronald, Has an Overjet and Is Being