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Questions and Answers
What are crown elevations and how do they form?
Crown elevations are the basic elevations found on the crowns of human teeth. They form from four or more growth centers or primary centers of calcification called lobes.
How do the anterior teeth, upper first and second premolars, and lower first premolar develop?
They develop from four lobes, which include 3 labial or buccal lobes and 1 lingual lobe.
How is the lower second premolar formed, and how many lobes does it have?
The lower second premolar is formed of the same number and arrangement of lobes as the anterior teeth and upper premolars if it has just two cusps. However, if it has three cusps (three cusp type), it is formed of 5 lobes (3 buccal and 2 lingual).
What are the representations of the lobes in teeth?
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What is a cusp, and where is it found?
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Study Notes
Tooth Development and Morphology
- Crown elevations are the bumps or ridges on the surface of a tooth that form during development
- Anterior teeth, including incisors and canines, develop from a single lingual lobe and a labial lobe that fuse together
- Upper first and second premolars develop from five lobes: three buccal and two palatal lobes that fuse together
- Lower first premolar develops from five lobes: four buccal and one lingual lobe that fuse together
- Lower second premolar develops from five lobes: four buccal and one lingual lobe that fuse together, and typically has four or five cusps
- Lobes of a tooth are represented by the cusps and grooves on its surface
- A cusp is a raised point or projection on the surface of a tooth, usually found at the tips of the lobes
- The number and arrangement of cusps and lobes determine the shape and function of a tooth
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Description
Learn about the surface anatomy of human teeth and the basic elevations and depressions found on their crowns. This quiz covers the definition and anatomical description of landmarks found on the crowns of different human teeth.
