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Questions and Answers
What is the primary anatomical feature defined as the imaginary line running between the pupils of the eyes?
Which line is essential for establishing the posterior occlusal plane of artificial teeth in a denture?
Which of the following structures is identified as a sulcus that deepens with aging and tooth loss?
The horizontal imaginary line drawn from the outer canthus of the eye to the superior border of the tragus is referred to as which line?
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The transitional epithelium located between the lip's mucous membrane and skin is known as what?
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What condition may result from the loss of teeth and resorption of the labial alveolar bone affecting the structures of the mouth?
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Which imaginary line is used to orient the maxillary occlusal plane in denture construction?
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What is an important function of proper positioning of artificial anterior teeth in a denture?
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Study Notes
Extraoral Landmarks
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Inter-pupillary Line: An imaginary line connecting the pupils of the eyes when the patient looks straight ahead. Used to orient the maxillary anterior occlusal plane.
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Ala-tragus Line: An imaginary line from the bottom of the nose wing to the top of the ear's tragus. Used to determine the posterior occlusal plane.
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Canthus-tragus Line: An imaginary line from the outer eye corner to the top of the ear's tragus. Helps locate the approximate position of the condyles.
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Naso-labial Sulcus: A depression extending from the nose wing downwards to the corner of the mouth. Deepens with age and tooth loss. A properly positioned denture can restore its normal contour. This can be achieved through:
- Correct placement of the denture's front teeth.
- Correct vertical dimension of occlusion.
- Proper shaping of the upper labial flange.
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Vermillion Border: The transitional tissue between the lip's mucous membrane and the skin.
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Description
This quiz focuses on essential extraoral landmarks used in dentistry. It covers important orientation lines, their purposes, and how they relate to dental prosthetics. Understanding these landmarks is crucial for proper denture placement and facial aesthetics.
