Australian Dental Council (ADC) Practice Test

The mylohyoid muscle plays a crucial role in the movement and stabilization of the lower denture, particularly in relation to the disto-lingual contour. Located in the floor of the mouth, this muscle forms a thin sheet that supports the tongue and helps with the positioning of the denture. When the mylohyoid contracts, it assists in elevating the floor of the mouth and creates a vacuum effect that holds the denture in place.

Its anatomical position allows it to influence how the lower denture interacts with the surrounding tissues, particularly in the area of the lingual aspect. This action is vital for ensuring proper fit and stability of the denture, especially when considering the contours that are less accessible and may require more muscular control.

The other muscles listed do not primarily function to aid in the stabilization or manipulation of lower dentures in the same manner. The mentalis, while responsible for the movement of the chin and lower lip, does not significantly affect denture stability. The masseter is primarily involved in the elevation of the mandible during chewing, lacking direct action on the denture. The buccinator functions mainly to compress the cheeks against the teeth, which does not specifically target the disto-lingual contour of the