Dental Anatomy: Mandibular Right First Molar

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Questions and Answers

What is the geometric shape of the occlusal aspect of a mandibular molar?

Triangular with equal sides

Hexagonal with unequal sides (correct)

Circular with unequal sides

Rectangular with equal sides

What is the order of size of the mandibular cusps?

Mesiobuccal, distobuccal, mesiolingual, distolingual, distal

Distobuccal, mesiolingual, distolingual, mesiobuccal, distal

Mesiobuccal, mesiolingual, distolingual, distal, distobuccal

Mesiobuccal, mesiolingual, distolingual, distobuccal, distal (correct)

What is the characteristic of the cusp ridges of the buccal cusps and distal cusp?

They are flattened (correct)

They are rounded

They are sharp and pointed

They are absent

What is the number of major and minor cusps on a mandibular molar?

4 major, 1 minor Signup and view all the answers

What is the shape of the central fossa?

Circular Signup and view all the answers

What is the mesiodistal measurement of the crown compared to the buccolingual measurement?

Greater than Signup and view all the answers

What is the shape of the lingual surface of the crown compared to the buccal surface?

Narrower Signup and view all the answers

What is the characteristic of the lingual cusps?

They are sharp with well-defined cusp ridges Signup and view all the answers

What is the base of the mesial triangular fossa?

Mesial marginal ridge Signup and view all the answers

How many pits are present in the occlusal aspect?

3 Signup and view all the answers

Where does the central developmental groove originate from?

Central pit Signup and view all the answers

What is the characteristic of the distal marginal ridge?

It is shorter and at a lower level than the mesial marginal ridge Signup and view all the answers

How many developmental grooves are present in the occlusal aspect?

4 Signup and view all the answers

What is the shape of the mesial aspect of the mandibular right first molar?

Rhomboidal Signup and view all the answers

Where does the distal course of the central developmental groove end?

Distal triangular fossa Signup and view all the answers

Where is the height of the buccal contour located?

Cervical third of the crown Signup and view all the answers

What is the shape of the lingual outline of the mesial aspect of the mandibular right first molar?

Convex Signup and view all the answers

Where is the height of the lingual contour located?

Middle third of the crown Signup and view all the answers

What is the relationship between the buccolingual measurement of the crown and root of the mandibular right first molar?

Greater mesially than distally Signup and view all the answers

Which cusps can be seen from the mesial aspect of the mandibular right first molar?

Both the mesiobuccal and mesiolingual cusps Signup and view all the answers

Where is the mesial contact area located?

At the junction of the occlusal and middle third of the crown Signup and view all the answers

What is the characteristic of the mesial surface of the mesial root?

Convex at the buccal and lingual borders Signup and view all the answers

What is the geometric shape of the distal aspect of the Mandibular right first molar?

Rhomboidal Signup and view all the answers

What is the characteristic of the buccal surface compared to the lingual surface in the distal aspect?

The buccal surface shows more convergence than the lingual surface Signup and view all the answers

What is the location of the distal contact area in the distal aspect?

More buccally Signup and view all the answers

What is the characteristic of the distal marginal ridge compared to the mesial marginal ridge?

It is shorter and at a lower level Signup and view all the answers

What is the characteristic of the distal root compared to the mesial root?

It is narrower buccolingually Signup and view all the answers

What is the shape of the surface of the crown of the mandibular right first molar?

Spherical Signup and view all the answers

What can be seen from the distal aspect of the Mandibular right first molar?

Most of the buccal surface and some part of the lingual surface Signup and view all the answers

What is the characteristic of the two lingual cusps of the mandibular right first molar?

They are sharper and longer than the buccal cusps. Signup and view all the answers

What is the shape of the cervical line in the distal aspect?

Straight Signup and view all the answers

What is the level of the mesiolingual cusp tip compared to the distolingual cusp tip?

Higher Signup and view all the answers

What is the characteristic of the distal cusp ridge and the distolingual cusp ridge?

They meet at an obtuse angle Signup and view all the answers

Why does the length of the roots seem more extreme lingually than buccally?

Because the cusp ridges and cervical line are at a higher level. Signup and view all the answers

What is the characteristic of the cervical line on the lingual surface?

It is curved apically and at a higher level than the buccal surface. Signup and view all the answers

What is the feature of the root trunk on the lingual surface?

A developmental depression is present on the root trunk. Signup and view all the answers

Where does the root bifurcation begin on the lingual surface?

About 4 mm below the cervical line Signup and view all the answers

What is the characteristic of the distal cusp on the lingual surface?

It is at a lower level than the mesiolingual cusp. Signup and view all the answers

Study Notes

Mandibular Right First Molar

Buccal Aspect

The buccal surface of the crown is smooth and spheroidal
The mesial and distal outlines are similar to the buccal aspect
MBDG (Mesiobuccal developmental groove) is present
CL (Cervical line) is present
MR (Mesial root) and DR (Distal root) are present
DBDG (Distobuccal developmental groove) is present
DC (Distal cusp), DLC (Distolingual cusp), and DBC (Distobuccal cusp) are present

Lingual Aspect

The surface of the crown is smooth and trapezoidal
The two lingual cusps are almost equal in width and are sharper and longer than the buccal cusps
The lingual developmental groove runs for a shorter distance on the lingual surface and is in line with the bifurcation of the root
The mesiolingual cusp tip is at a higher level than the distolingual cusp
The crown tapers lingually, making the lingual surface narrower than the buccal surface
The cervical line on the lingual surface is irregular and curved apically

Mesial Aspect

The geometric shape is rhomboidal
The buccal outline is more convex in the cervical third (the cervical ridge) then slightly convex to the mesiobuccal cusp tip
The height of the buccal contour is in the cervical third of the crown
The lingual outline is convex from the cervix to the mesiolingual cusp tip
The height of the lingual contour is at the center of the middle third
Only the mesiobuccal and mesiolingual cusps can be seen from this aspect
The mesiolingual cusp tip is sharp and at a higher level than the flattened mesiobuccal cusp tip

Distal Aspect

The geometric shape is rhomboidal
The buccal and lingual outlines are the same as the mesial aspect
The distal surface is shorter and narrower than the mesial surface
Most of the buccal surface and some part of the lingual surface can be seen from this aspect
The distal marginal ridge is shorter and at a lower level than the mesial marginal ridge
The distal contact area is placed more buccally
The cervical line is straight

Occlusal Aspect

The geometric shape is hexagonal with unequal sides
The mesiodistal measurement of the crown is greater than the buccolingual measurement
The crown is bulkier mesially than distally because the crown tapers in a distal direction
All mandibular molars have four major cusps (MB, DB, ML, DL) and one minor cusp (distal cusp)
The size of the mandibular cusps in decreasing order is: mesiobuccal cusp, mesiolingual and distolingual cusps, distobuccal cusp, and distal cusp
There is one major fossa (central fossa) and two minor fossae (mesial triangular fossa and distal triangular fossa)
The central fossa is bounded by the distal slope of the mesiobuccal cusp, the mesial and distal slopes of the distobuccal cusp, and the mesial slope of the distal cusp
The marginal ridges are: mesial marginal ridge, distal marginal ridge, and central developmental groove
There are three pits: central pit, mesial pit, and distal pit

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Description

Identify the different parts of the mandibular right first molar, including roots, cusps, and developmental grooves. Test your knowledge of dental anatomy!