Podcast
Questions and Answers
What is the shape of the crown of the mandibular first molar?
What is the shape of the crown of the mandibular first molar?
- Circular
- Trapezoidal (correct)
- Triangular
- Rectangular
Which cusp is the widest mesiodistally on the lingual aspect?
Which cusp is the widest mesiodistally on the lingual aspect?
- Distolingual cusp
- Mesiobuccal cusp
- Distobuccal cusp
- Mesiolingual cusp (correct)
How does the mesial root of the mandibular first molar curve?
How does the mesial root of the mandibular first molar curve?
- Distally from the cervical line to the apex
- Mesially from the cervical line to the apical third, then distally to the apex
- Mesially from the cervical line to the middle third, then distally to the apex (correct)
- The mesial root does not curve
What is the approximate distance between the cervical line and the point of bifurcation of the two roots?
What is the approximate distance between the cervical line and the point of bifurcation of the two roots?
Which of the following accurately describes the cervical line of the mandibular first molar?
Which of the following accurately describes the cervical line of the mandibular first molar?
How do the roots of the mandibular first molar appear from the lingual aspect compared to the buccal aspect?
How do the roots of the mandibular first molar appear from the lingual aspect compared to the buccal aspect?
Flashcards
What shape is the mandibular first molar crown?
What shape is the mandibular first molar crown?
The shape of the crown, like a trapezoid.
Which cusp is widest on the lingual side?
Which cusp is widest on the lingual side?
It is the widest cusp on the lingual side when looking mesiodistally.
How does the mesial root of the mandibular first molar curve?
How does the mesial root of the mandibular first molar curve?
The mesial root curves in the direction of the midline from the neck to the middle section, and then curves away from the midline towards the tip.
What is the distance from the neck to the root bifurcation of the mandibular first molar?
What is the distance from the neck to the root bifurcation of the mandibular first molar?
Signup and view all the flashcards
Describe the cervical line of the mandibular first molar.
Describe the cervical line of the mandibular first molar.
Signup and view all the flashcards
How do the roots of the mandibular first molar appear from lingual vs. buccal?
How do the roots of the mandibular first molar appear from lingual vs. buccal?
Signup and view all the flashcards
Study Notes
Crown of Mandibular First Molar
- The crown is roughly trapezoidal in shape
- All five cusps are visible from the buccal aspect
- The mesiobuccal, distobuccal, and distal cusps are relatively flat
- The mesial outline of the crown is concave at the cervical third, then convex at the contact area
- The distal outline of the crown is straight above the cervical line, then convex at the distal contact
- The surface of the buccal portion of the crown is smoothly convex
Cusp Portions and Developmental Groove
- The cusp portions have a developmental groove between them
Cervical Line and Root Formation
- The cervical line is regular
- The point of bifurcation of the two roots is approximately 3 mm below the cervical line
- The mesial root curves mesially from a point shortly below the cervical line, then distally to the tapered apex
- The distal root is less curved, with some curvature possible at its apical third
- The apex is usually more pointed than that of the mesial root
Lingual Aspect
- The two lingual cusps are pointed and separated by the lingual groove
- The mesiolingual cusp is the widest mesiodistally, with its cusp tip higher than the distolingual cusp
- The cervical line lingually is irregular
- The roots of the mandibular first molar appear 1 mm longer lingually than buccally
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
