16 Questions
How does the occlusal outline of a three-cusp type premolar differ from the first premolar?
It has a square outline.
Which cusp is the largest in a three-cusp type premolar?
The buccal cusp
Where are the contact areas in the occlusal aspect of a three-cusp type premolar?
Broad and flat
What is the location of developmental grooves in a three-cusp type premolar?
Meet at the central pit
Which characteristic is true about the distal aspect of the three-cusp type premolar?
All three cusps are visible
Which cusp is larger in the three cusps type of the mandibular second premolar?
Mesio-lingual cusp
Which of the following differentiates the mesial aspect of the mandibular second premolar from the mandibular first premolar?
The mesial marginal ridge is higher.
In the two cusps type of the mandibular second premolar, which characteristic is correct?
A large cusp of the same height as in the three cusps type
What is absent on the mesial surface of the crown in the mandibular second premolar?
Mesio-lingual developmental groove
Which aspect of the mandibular second premolar has more developed lingual cusps?
Lingual aspect
Which of the following is a principle identifying feature of the mandibular second premolar?
It is larger than the mandibular first premolar.
What is the most common form of the mandibular second premolar?
One buccal cusp and two lingual cusps
Which characteristic does not belong to the buccal aspect of the mandibular second premolar?
The mesial and distal contact areas are at different levels.
In the two-cusp type of the mandibular second premolar, which cusps are present?
One buccal cusp and one lingual cusp
Which of the following is true regarding the root of the mandibular second premolar compared to the mandibular first premolar?
It is longer and broader mesio-distally.
Which aspect of the mandibular second premolar shows no mesio-lingual developmental groove?
Occlusal
Study Notes
Mandibular Second Premolar
- Located fifth from the median line in the mandible
- Two forms: three-cusp type and two-cusp type
Characteristics
- Larger than the mandibular first premolar
- Cusps are more equal in size with less pointed tips
- Occlusal outline is almost square in appearance
- No mesio-lingual developmental groove
- Longer and larger root than the mandibular first premolar
Buccal Aspect
- Buccal cusp is shorter and less pointed than the mandibular first premolar
- Mesial and distal contact areas are broad and at the same level
- Root is longer and broader mesio-distally than that of mandibular first premolar
- Outline is similar to the mandibular first premolar
Lingual Aspect
- Lingual cusps are more developed
- Three-cusp type: two lingual cusps (mesio-lingual and disto-lingual) divided by lingual developmental groove
- Two-cusp type: one large lingual cusp of the same height as in the three-cusp type
Mesial Aspect
- Crown and root are wider bucco-lingually than the mandibular first premolar
- Buccal cusp is not nearly the center of the root and is shorter
- Length of the lingual cusp is much near the length of the buccal cusp
- No mesio-lingual developmental groove on the mesial surface of the crown
- Mesial marginal ridge is higher
Distal Aspect
- All three cusps can be seen from this aspect
- Distal marginal ridge is lower than in the mesial aspect
Occlusal Aspect
- Square outline in the three-cusp type
- Three cusps: buccal (largest), mesio-lingual, and disto-lingual
- Each cusp has a well-formed triangular ridge separated by developmental groove, forming a Y-shape on the occlusal surface
- Contact areas are broad and flat
- Three developmental grooves: mesial, distal, and lingual, which meet at the central pit located slightly distally
Learn about the characteristics of the mandibular second premolar, including its forms and identifying features.
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