Mandibular 2nd and 3rd Molars Flashcards
Eruption time for mandibular 2nd molar
11-13 yrs
Shape of mandibular 2nd molar crown from the buccal
trapezoidal
Does the mandibular 2nd molar have a DB groove
no
T/F: All four cusp on the mandibular 2nd molar can be the same size
t
(mandibular 2nd molar/ mandibular 1st molar) has longer roots
mandibular 2nd molar
Buccal HOC for mandibular 2nd molar
Cervical third
Lingual HOC for mandibular 2nd molar
Junction of middle and occlusal thirds
(mandibular 2nd molar/ mandibular 1st molar) has more divergent roots
mandibular 1st molar
Crown shape of the mandibular 2nd molar from the lingual
trapezoidal
Mesial contact for mandibular 2nd molar
Junction of middle and occlusal thirds
Distal contact for mandibular 2nd molar
middle third
The CEJ of the mandibular 2nd molar is more (occlusal/cervical) on the lingual verses the buccal
occlusal
Shapes of the mesial and distal crown of mandibular 2nd molar
rhomboidal
Which root is wider on the mandibular 2nd molar
mesial
Shape of the occlusal table for mandibular 2nd molar
rectangle
Range the cusp sizes of the mandibular 2nd molar from smallest to largest
DL-ML-DB-MB
How many transverse ridges does the mandibular 2nd molar have
2
What are the cusps involved in the transverse ridges for the mandibular 2nd molar
- MB/ML
- DB/DL
How many fossae does the mandibular 2nd molar have? Names?
3– same names as Mandibular 1st molar (central, mesial triangular, and distal triangular)
T/F the BL(M) dimension of the mandibular 2nd molar is larger than the BL(D) dimension
T
T/F: The MD(B) dimension is smaller than the MD (L) dimension
F other way around
What is the occlusal pattern for the mandibular 2nd molar in the central groove
+4
T/F: The central groove in the mandibular 2nd molar is relatively straight
t
Eruption time for mandibular 3rd molar
17-18 yrs
T/F: The mandibular 3rd molar can be the largest molar in the mandibular arch
t– but most often it is the smallest
Type 1 mandibular 3rd molar resembles
permanent mandibular 2nd molar
Type 1 mandibular 3rd molar has… cusps
4
Type II mandibular 3rd molar resembles….
Permanent mandibular 1st molar
Type II mandibular 3rd molar has…cusps
5
Type (I/II) is the most common form of mandibular 3rd molars
I
Type I mandibular 3rd molar typically has… roots
fused
Type II typically have…. roots
separate mesial and distal roots