Question 37 (part 2) · LDEK · Occlusion
Indicate true statements regarding the resting position of the mandible:
1) the mandible is positioned in the relaxed occlusion, adopted instinctively, and its middle is compatible with the medial body line;
2) protruding and retruding muscles, protruding and retruding the mandible are in balance;
3) it occurs as the result of bilateral equally minimal muscle spasm of muscles protruding and retruding the mandible;
4) heads of mandible in the joints are positioned symmetrically with slight shift towards the bottom and front from the central position;
5) joint heads are positioned symmetrically, in the most posterior position in articular surface;
6) teeth of lower and upper arch achieve first contacts in the area of their slopes;
7) in normal, physiological conditions multipoint contact of opposite teeth occurs;
8) at preserved occlusal height between the dental arches small space is observed.
Correct answer is:
2) protruding and retruding muscles, protruding and retruding the mandible are in balance;
3) it occurs as the result of bilateral equally minimal muscle spasm of muscles protruding and retruding the mandible;
4) heads of mandible in the joints are positioned symmetrically with slight shift towards the bottom and front from the central position;
5) joint heads are positioned symmetrically, in the most posterior position in articular surface;
6) teeth of lower and upper arch achieve first contacts in the area of their slopes;
7) in normal, physiological conditions multipoint contact of opposite teeth occurs;
8) at preserved occlusal height between the dental arches small space is observed.
Correct answer is:
- A. 1,2,7.
- B. 1,3,8.
- C. 5,6.
- D. 2,4,8.
- E. 1,4,7.
Hint
At physiological rest the teeth are apart and the muscles are in tonic balance; contrast this with centric relation and intercuspation.
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