Morphology of Permanent Mandibular Molars Exam 2025 With 100% Correct Answers

Morphology of Permanent Mandibular
Molars Exam 2025 With 100% Correct
Answers

_________ widths make up 44% of the quadrant width. - CORRECT ANSWER✔✔Maxillary molar



________ widths make up 51% of the quadrant width. - CORRECT ANSWER✔✔Mandibular
molar



What are the functions of the molars? - CORRECT ANSWER✔✔1. Mastication (grinding)

2. Maintenance of vertical dimension of face

3. Maintenance of arch continuity for proper alignment

4. Support cheeks (esthetics)



What traits differentiate mandibular second molars from mandibular first molars from the
buccal view? - CORRECT ANSWER✔✔1. 1st Mand molar most often have 5 cusps, while 2nd
Mand PM has 4 cusps.



2. 1st Mand molar has two buccal grooves (mesiobuccal, distobuccal) while 2nd Mand molar
has one (buccal) groove.



3. More crown taper from distal contact to CEJ on 1sts than 2nds. Mesial contour on both teeth
is more straight than distal.



4. Root trunk is shorter on 1st than 2nd.

, 5. Roots more divergent toward apex on 1st than 2nd.



Both mandibular molars are normally wider _______ than _______ (more so on firsts--distal
cusp) - CORRECT ANSWER✔✔mesiodistally; occlusocervically



How many cusps does the 1st Mand molar have? Which is the largest? Which is the smallest? -
CORRECT ANSWER✔✔5 cusps:

-Three buccal: MB > DB > D



-Two lingual:

ML > DL



Largest: mesiobuccal



Smallest: distal cusp



_______% of mandibular first molars have five cusps. - CORRECT ANSWER✔✔80-85%



*The 5th cusp is the 3rd distal cusp on the buccal surface.



How many cusps does the 2nd Mand molar have? Which is the largest? Which is the smallest? -
CORRECT ANSWER✔✔4 cusps:

-Two buccal:

MB > DB



-Two lingual:

ML > DL