A patient presents with a jaw opening measurement of 45 mm. What can be concluded about their laterotrusion motion?

To assess laterotrusion—the side-to-side movement of the jaw—it is important to consider the relationship between the amount of jaw opening and the expected range of motion. A jaw opening measurement of 45 mm is within the normal range for maximum interincisal opening, which typically spans from 40 mm to 60 mm for most individuals. However, normal interincisal opening does not directly indicate that laterotrusion is also normal.

Laterotrusion motion, when measured, usually should adhere to certain normative values, which indicate that a normal range for this motion is generally around 10 to 15 mm in each direction. If a patient's opening is less than what is clinically typical for laterotrusion—meaning that their ability to move the jaw side-to-side is restricted—it suggests that their lateral movement could be limited. Factors such as muscle tightness, joint issues, or structural abnormalities can contribute to this limitation.

Therefore, concluding that laterotrusion is limited is appropriate given this patient context. A measurement of 45 mm for jaw opening does not specifically indicate any excess or insufficient laterotrusion but highlights the possibility of restricted side-to-side movement, warranting further evaluation.