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Questions and Answers
The buccal groove divides the occlusal margin into three parts.
False
The outline of the distobuccal cusp is wider than the mesiobuccal cusp.
False
The mesiolingual cusp tip is not visible between the buccal cusps.
False
The two buccal cusps are of different heights.
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The distobuccal cusp tip is duller than the mesiobuccal cusp tip.
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What is the shape of the cervical line on the distal surface?
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How does the buccal outline of the distal surface compare to the mesial aspect?
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How does the distal marginal ridge compare to the mesial marginal ridge?
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What is the location of the tip of the distal cusp?
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How does the occlusal outline of the distal surface compare to the mesial surface?
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What is the shape of the distal surface compared to the mesial surface?
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What can be seen more of on the distal surface compared to the mesial surface?
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What is the most prominent feature of the distal surface?
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What is the general shape of the distal surface?
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How does the cervical line curve on the distal surface?
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Why is the height of the distal marginal ridge variable?
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What is the location of the distal marginal groove?
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What is visible on the distal surface that is not visible on the mesial surface?
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Study Notes
Tooth Structure
- The buccal groove divides the occlusal margin into two parts: mesiobuccal cusp and distobuccal cusp.
- The mesiobuccal cusp has a wider outline.
- The distobuccal cusp has a sharper tip.
- The two buccal cusps are approximately the same height.
- The mesiolingual cusp tip is visible between the buccal cusps.
Distal Surface of Tooth
- Distal surface is similar in outline to the mesial surface, but smaller in size, especially in the buccolingual dimension.
- The buccal margin is similar to the mesial aspect, but the concavity in the middle third is less evident.
- The lingual outline is comparable to the mesial aspect.
Cervical Outline
- The cervical line is relatively straight, with a slight curvature occlusally.
- The cervical line is located at a more cervical level at the buccal extremity than at the lingual.
Occlusal Outline
- The occlusal outline is shorter than the mesial surface, but similarly concave.
- The distal marginal ridge is notched by the distal marginal groove, which is shorter than the mesial marginal groove and located to the lingual of center.
- The height of the distal marginal ridge is dependent on the prominence of the distal cusp.
- The distal marginal ridge is located at a more cervical level than the mesial, but its height is more variable.
Other Characteristics
- The distal surface is shorter occlusogingivally than the mesial surface, making more of the occlusal surface visible.
- The distal cusp is the most prominent feature of this view, with portions of all five cusps visible.
- The buccal surface is visible, converging towards the distal, resulting in a narrower buccolingual dimension.
- The distobuccal groove is visible from this aspect due to the convergence of the buccal surface.
- The distal contact area is larger than the mesial contact area, with an ovoid outline, wider buccolingually than occlusocervically.
Distal Surface of Tooth
- Distal surface is similar in outline to the mesial surface, but smaller in size, especially in the buccolingual dimension.
- The buccal margin is similar to the mesial aspect, but the concavity in the middle third is less evident.
- The lingual outline is comparable to the mesial aspect.
Cervical Outline
- The cervical line is relatively straight, with a slight curvature occlusally.
- The cervical line is located at a more cervical level at the buccal extremity than at the lingual.
Occlusal Outline
- The occlusal outline is shorter than the mesial surface, but similarly concave.
- The distal marginal ridge is notched by the distal marginal groove, which is shorter than the mesial marginal groove and located to the lingual of center.
- The height of the distal marginal ridge is dependent on the prominence of the distal cusp.
- The distal marginal ridge is located at a more cervical level than the mesial, but its height is more variable.
Other Characteristics
- The distal surface is shorter occlusogingivally than the mesial surface, making more of the occlusal surface visible.
- The distal cusp is the most prominent feature of this view, with portions of all five cusps visible.
- The buccal surface is visible, converging towards the distal, resulting in a narrower buccolingual dimension.
- The distobuccal groove is visible from this aspect due to the convergence of the buccal surface.
- The distal contact area is larger than the mesial contact area, with an ovoid outline, wider buccolingually than occlusocervically.
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Description
This quiz covers the structure and features of molars, including the buccal groove and cusps. Identify the characteristics of the mesiobuccal and distobuccal cusps, and learn about the outline and height of these dental features.
