Which position is achieved entirely by soft tissue, without guidance from teeth?

Which position is achieved entirely by soft tissue, without guidance from teeth?

a. Postural (physiologic rest) 
b. Centric occlusion
c. Centric relation 
d. Protruded contact

Ans. A. In postural rest position, the mandible stays a comfortable distance from the maxilla, with the teeth slightly separated.

The freeway space between the teeth is often 2-5 mm. There is no tooth contact, and the position is determined and maintained by the muscles of occlusion and related tendons and ligaments. Centric occlusion involves full tooth contact.

Centric relation is normally a few millimeters distal to centric occlusion and is achieved by moving distal from centric occlusion. This procedure involves tooth contact. Protruded contact involves contacting guidance of the maxillary and mandibular teeth during protrusion.