Podcast
Questions and Answers
How many cusps does the mandibular first molar have?
How many cusps does the mandibular first molar have?
Which surface of the mandibular first molar is described as bulky and lingually inclined?
Which surface of the mandibular first molar is described as bulky and lingually inclined?
What shape does the occlusal outline of the mandibular first molar resemble?
What shape does the occlusal outline of the mandibular first molar resemble?
What is the position of the mesial contact area in relation to the cervical line?
What is the position of the mesial contact area in relation to the cervical line?
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Which cusp is described as slightly wider than the disto-buccal cusp?
Which cusp is described as slightly wider than the disto-buccal cusp?
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What aspect of the mandibular first molar is characterized by pointed cusps forming obtuse angles?
What aspect of the mandibular first molar is characterized by pointed cusps forming obtuse angles?
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Where is the point of bifurcation of the two roots located in relation to the cervical line?
Where is the point of bifurcation of the two roots located in relation to the cervical line?
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Which developmental groove is shorter between the mesio-buccal and the disto-buccal grooves?
Which developmental groove is shorter between the mesio-buccal and the disto-buccal grooves?
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What is the shape of the crown from the occlusal aspect?
What is the shape of the crown from the occlusal aspect?
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Which cusp is the largest in size according to the occlusal aspect?
Which cusp is the largest in size according to the occlusal aspect?
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Where is the mesial marginal ridge located relative to the cusp tips?
Where is the mesial marginal ridge located relative to the cusp tips?
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What feature describes the lingual outline of the crown?
What feature describes the lingual outline of the crown?
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What is the position of the distal cusp in relation to the tooth's long axis?
What is the position of the distal cusp in relation to the tooth's long axis?
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What describes the cervical line from the mesial aspect?
What describes the cervical line from the mesial aspect?
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Which groove divides the Mesio-buccal and Disto-buccal cusp?
Which groove divides the Mesio-buccal and Disto-buccal cusp?
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What distinguishes the distal root compared to the mesial root?
What distinguishes the distal root compared to the mesial root?
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Study Notes
Principal Identifying Features of the Mandibular First Molar
- Comprises five cusps: two buccal, two lingual, and one distal.
- Bulkier buccal surface is inclined lingually, featuring two developmental grooves.
- Mesio-distal width exceeds bucco-lingual width.
- Occlusal outline is rectangular.
- Contains two well-developed roots: one mesial and one distal.
Buccal Aspect
- Mesial contact area locates at the junction of the occlusal and middle thirds.
- Lower distal contact area compared to the mesial contact area.
- Regular cervical line curves apically.
- Two developmental grooves present between buccal cusps; the mesio-buccal groove is shorter than the disto-buccal groove.
- Visible cusps include mesio-buccal, disto-buccal, and distal; tips of mesio-lingual and disto-lingual cusps are also noticeable.
- Mesio-buccal cusp is wider than the disto-buccal cusp; together they account for 80% of the mesio-distal width.
- Buccal cusps are flat on top, while the distal cusp is rounded.
- Bifurcation point of roots is approximately 3 mm below the cervical line.
Lingual Aspect
- Displays three cusps: mesio-lingual, disto-lingual, and the lingual portion of the distal cusp.
- Mesio-lingual cusp is the widest and tallest; distal cusp is the shortest.
- Lingual developmental groove descends about one-third of crown length, separating the lingual cusps.
Mesial Aspect
- Crown has a rhomboidal shape with a lingual tilt of the buccal outline.
- Buccal outline is convex at the cervical-middle junction, then straightens to cusp tip.
- Lingual outline is less convex; the crest of curvature is at the middle third center.
- Irregular cervical line is positioned higher on the lingual side than the buccal side.
- Buccal cusp is flat while the lingual cusp is sharp and taller.
- Mesial marginal ridge is about 1 mm below cusp tips.
Distal Aspect
- Crown height is shorter distally, revealing more buccal, lingual, and occlusal surfaces.
- Distal cusp is located buccal to the tooth's long axis.
- Distal marginal ridge is short and curves cervically, forming an obtuse angle.
- Cervical line appears irregular.
- Distal root is narrower compared to the mesial root.
Occlusal Aspect
- Crown shape is rectangular, mesio-distally longer by 1 mm than bucco-lingually.
- Greater bucco-lingual measurement on the mesial than on the distal side.
- Mesio-distal measurement on the buccal side exceeds that on the lingual side.
- More of the buccal surface is visible than the lingual surface.
- Features five cusps, with sizes ranked as: mesio-buccal (largest), mesio-lingual, disto-lingual, disto-buccal, and distal (smallest).
- Distal contact area is located on the distal cusp.
- Contains four developmental grooves: central, mesio-buccal (dividing mesio-buccal and disto-buccal), disto-buccal (dividing disto-buccal and distal), and lingual (separating mesio-lingual and disto-lingual).
- Three fossa present: central fossa.
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Description
Explore the intricate features of the mandibular first molar in this quiz. You'll learn about its unique cusps, root structure, and overall crown dimensions. Test your knowledge on the distinguishing characteristics that define this important tooth.
