Question 119 · LDEK · Clinical examination
Find proper characteristics concerning the physiological lip position which are assessed during extraoral examination:
1) approximately 2 mm of upper incisors' incisal edges should be displayed from underneath the upper lip at rest and on smiling;
2) at rest the lower lip should cover approximately 3/4 of the incisal part of the upper incisors' labial crown surface;
3) lip step according to Korkhaus should be positive;
4) the value of the nasolabial angle is approximately 109.8º and does not depend on age or gender;
5) in physiological conditions the subnasale-stomion distance makes 1/3 of the maxillary segment and the stomion-gnathion distance makes 2/3 of the maxillary segment height.
The correct answer is:
2) at rest the lower lip should cover approximately 3/4 of the incisal part of the upper incisors' labial crown surface;
3) lip step according to Korkhaus should be positive;
4) the value of the nasolabial angle is approximately 109.8º and does not depend on age or gender;
5) in physiological conditions the subnasale-stomion distance makes 1/3 of the maxillary segment and the stomion-gnathion distance makes 2/3 of the maxillary segment height.
The correct answer is:
- A. 1,3.
- B. 1,4,5.
- C. 1,2,4,5.
- D. 2,3,5.
- E. 1,4.
Hint
Check each lip feature against normal values: incisor display, lower lip coverage, the Korkhaus lip step, nasolabial angle and lower face proportions.
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