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Questions and Answers
What does the Nasolabial Sulcus extend from?
The ala of the nose to the corners of the mouth.
What does the curvature of the Mentolabial Sulcus indicate?
What is the normal angle of the Nasolabial Angle in profile view?
Approximately 90 degrees.
The ___ is a diamond-shaped area at the center of the upper lip and base of the nose.
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What is the transitional epithelium between the mucous membrane of the lips and the skin called?
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What condition can result from a lack of proper support of the upper lip at the angle of the mouth?
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Where is the Modiolus located?
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What does the Interpupillary line aid in?
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Study Notes
Extra Oral Landmarks
- The nasolabial sulcus is a crease that extends from the ala of the nose to the corners of the mouth.
- Its prominence increases with age.
- This landmark is important for proper positioning of anterior teeth, establishing occlusal vertical dimensions, and determining the thickness of the denture flange.
- The mentolabial sulcus is a horizontal crease between the lower lip and the chin.
- Its curvature indicates the type of maxillomandibular relationship.
- Obtuse in Class I occlusion.
- Acute in Class II occlusion.
- Flat in Class III occlusion.
- Its curvature indicates the type of maxillomandibular relationship.
- The nasolabial angle is the angle between the columella of the nose and the philtrum of the lip.
- It is typically around 90 degrees when viewed in profile.
- The philtrum is a diamond-shaped area at the center of the upper lip.
- It is located at the base of the nose.
- It is affected by the positioning of anterior teeth, denture flange thickness, and the loss of teeth and alveolar bone, which can lead to flattening of the area.
- The vermillion border is the transition between the lip's mucous membrane and the skin.
- It is affected by the positioning of anterior teeth and the presence of the orbicularis oris muscle.
- Loss of teeth and alveolar bone resorption causes the orbicularis oris muscle to lose support resulting in a palatal drop, and thus diminished vermillion border.
- The angle of the mouth is the point where the upper and lower lips meet.
- Dentures should provide support to the angle of the mouth.
- Lack of support can lead to angular cheilitis, an inflammation and fissuring at the angle of the mouth.
- The modiolus is the meeting point of the buccinator and other facial muscles near the corner of the mouth.
- Loss of teeth can displace the modiolus, leading to a sunken cheek appearance.
- The buccal surface of the lower denture must be thin to avoid lifting the denture.
- The interpupillary line is an imaginary line connecting the pupils of the eyes when looking straight forward.
- It aids in orienting the anterior occlusal plane of artificial teeth.
- Parallelism allows vertical force transmission across the dentition.
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Description
Explore key extra oral landmarks important for dental professionals, including the nasolabial sulcus, mentolabial sulcus, nasolabial angle, and philtrum. Understanding these landmarks is crucial for proper dental positioning and relationship assessments in occlusion. This quiz will test your knowledge and understanding of these anatomical features.
