Anatomy of Molars

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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.

False Signup and view all the answers

The distobuccal cusp tip is duller than the mesiobuccal cusp tip.

False Signup and view all the answers

What is the shape of the cervical line on the distal surface?

Straight Signup and view all the answers

How does the buccal outline of the distal surface compare to the mesial aspect?

It is similar, with no concavity Signup and view all the answers

How does the distal marginal ridge compare to the mesial marginal ridge?

It is shorter and less prominent Signup and view all the answers

What is the location of the tip of the distal cusp?

Toward the buccal, occlusal to the contact area Signup and view all the answers

How does the occlusal outline of the distal surface compare to the mesial surface?

It is shorter and less concave Signup and view all the answers

What is the shape of the distal surface compared to the mesial surface?

Narrower buccolingually and shorter occlusogingivally Signup and view all the answers

What can be seen more of on the distal surface compared to the mesial surface?

The occlusal surface Signup and view all the answers

What is the most prominent feature of the distal surface?

The distal cusp Signup and view all the answers

What is the general shape of the distal surface?

Similar in outline to the mesial surface Signup and view all the answers

How does the cervical line curve on the distal surface?

It curves occlusally to a slight degree Signup and view all the answers

Why is the height of the distal marginal ridge variable?

Because of its relation to the distal cusp Signup and view all the answers

What is the location of the distal marginal groove?

To the lingual of center Signup and view all the answers

What is visible on the distal surface that is not visible on the mesial surface?

More of the buccal surface Signup and view all the answers

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.