Advanced Dental Admission Test (ADAT)

What condition is defined by an abnormal lateral movement of the mandible resulting from contact on the working side?

1. Normal occlusion

2. Laterotrusive motion

3. Mediotrusive movement

4. Maxillary occlusion

The correct answer is: Laterotrusive motion

The condition defined by an abnormal lateral movement of the mandible resulting from contact on the working side is known as laterotrusive motion. In dental terminology, laterotrusive movement refers to the movement of the mandible toward the side of the working condyle during excursions. In this motion, the working side is the side where the jaw is moving toward, and any abnormality in this lateral movement can indicate issues such as malocclusion or temporomandibular joint (TMJ) dysfunction. Understanding laterotrusive motion is important in assessing how the teeth and jaw interact during lateral movements. When there are contacts on the working side that disrupt the normal pathway of movement, it can lead to abnormal wear on the teeth, discomfort, or pain, and could signify a need for further evaluation or treatment. In contrast, the other choices refer to different concepts. Normal occlusion describes a situation where teeth align properly in relation to one another and the jaw, without any abnormal movements. Mediotrusive movement involves the lateral movement of the mandible toward the non-working side, which is distinct from the laterotrusive motion that focuses on the working side. Maxillary occlusion typically refers to the positioning of the upper jaw in relation