PRDS Quiz Flashcards
At what age does the permanent first mandibular molar erupt?
6-7 Years
TRUE OR FALSE: Root formation of the permanent first molar is usually complete when the maxillary first premolar starts to erupt.
True
How many cusps does the permanent second mandibular molar usually have?
Four cusps
Which of the following statements about the permanent second mandibular molar is correct?
Has characteristically 2 roots, mesial root has 2 canals, Mesiobuccal cusp is most prominent cusp, pulp chamber has 4 horns.
Which primary tooth is exfoliated when the mandibular first permanent molar erupts?
None.
When comparing the anatomy of the mandibular third molar to that of other mandibular molars, the mandibular third molar is more likely to exhibit:
a more irregular CEJ
Which of the following statements is correct with regard to the mandibular third molar?
(All of the above): tooth tapers dramatically from proximal contacts to root apex, root system may be fused, coronal outline is quite rounded in form.
From the occlusal view of the mandibular third molar:
the occlusal groove pattern varies considerably.
Which of the following is correct regarding the root system of the mandibular third molar?
(All of the above): root system is more compact in form, root system curves towards the distal, the internal and external root morphology varies considerably.
Which of the following characteristics of the mandibular third molar is most likely to be similar to the mandibular second molar?
Number of cusps.
From the facial view of the mandibular second molar
lingual cusps appear taller and sharper than facial cusps
From the facial view of the mandibular second molar (2)
(All of the above): mesial outline of the crown is straighter than the distal outline of the crown, the mesial contact is located at junction of the occlusal and middle thirds of the crown, the distal contact is located in the middle third of the crown
From the mesial view of mandibular second molar
The mesiofacial cusp is shorter and more blunt than the mesiolingual cusp
From the mesial view of the mandibular second molar (2)
the facial height of contour is near the cervical 1/3 of the crown
From the distal view of the mandibular second molar:
(All of the above) All four cusps are visible, more occlusal surface is visible than from the mesial view, the distal cusps are further apart faciolingually than are the mesial cusps
From the occlusal view of the mandibular second molar:
(All of the above): the central developmental groove is the longest groove, there are more supplemental grooves than are seen on the first mandibular molar, both proximal contacts are centered faciolingually
When comparing the mandibular first and second molars, which of the following features is common to both teeth:
A large central fossa and two triangular fossae
When examining the occlusal view of the mandibular first and second molars, which of the following features is common to both teeth?
None of the above. (Eliminates faciolingual position of distal contact, number of cusps, occlusal outline form of the crown)
Which of the following developmental grooves is not located on the occlusal surface of the mandibular second molar?
distofacial developmental groove
Which of the following statements is correct when examining the cervical cross section of the mandibular second molar?
(All of the above) The root is wider mesiodistally than faciolingually, depressions are usually located on the facial and lingual surfaces of the root, occasionally there may only be one C-shaped canal
From the facial view of the mandibular first molar, the root bifurcation is:
distal to the mesiofacial developmental groove
From the mesial view of the mandibular first molar, the contact area is:
centered faciolingually
From the lingual view of the mandibular first molar
(All of the above) The lingual cusps are taller than the facial cusps, the distal cusp forms the distal height of contour, the roots appear longer than from the facial view
When examining the distal view of the mandibular first molar
the contact area is located facial to center on the crown
The cusps of the mandibular first molar are ranked in size from largest to smallest
mesiofacial, mesiolingual, distolingual, distofacial, distal
on the mandibular first molar
the central developmental groove is the longest developmental groove
on the mandibular first molar (2)
the root trunk has a facial and lingual developmental depression
on the mandibular first molar (3)
the central fossa is the largest fossa
From the distal view of the mandibular first molar
(All of the above) distal root is narrower faciolingually than the mesial root, the distal marginal ridge is shorter faciolingually than the mesial marginal ridge, the facial surface tapers more to the distal than the lingual surface
At what age do the mandibular 1 molars’ enamel complete?
2.5 years
At what age do mandibular 2nd molar enamel complete?
7-8 years
At what age do mandibular 2nd molars complete eruption
11-13 years
at what age do mandibular 1 molar roots complete
9-10 years
at what age do mandibular 2nd molar roots complete
14-15
