NBDE part 2- Endodontics UPDATED
ACTUAL Exam Questions and CORRECT
Answers
maxillary central incisor average length is ______. Shape of access opening should be
___________ - CORRECT ANSWER - 22-23mm
Oval-triangular
Maxillary central, lateral, and canine roots have ________ axial inclination - CORRECT
ANSWER - distal
Shape of access opening for maxillary lateral incisor - CORRECT ANSWER - oval
Maxillary canine average length is ___________ and the shape of access opening should be
_________ - CORRECT ANSWER - 26-27mm
oval
Mandibular central incisor- most common # of canals and foramen - CORRECT ANSWER -
1 canal, 1 foramen (70%)
2 canals, 1 foramen (24%)
2 canals, 2 foramina (6%)
When theres 2 canals, the labial canal is the straighter one
Mandibular lateral incisor- most common # of canals/foramen - CORRECT ANSWER -1
canal, 1 foramen (56%)
2 canals, 2 foramina (30%)
2 canals, 1 foramen (14%)
___% of mandibular laterals have 2 canals - CORRECT ANSWER - 44%
,Mandibular canines- most common # of canals/foramen - CORRECT ANSWER - 1 canal
(94%)
2 canals 2 foramina (6%)
Maxillary first premolar- most common # of canals/foramen - CORRECT ANSWER - 2 roots
and 2 canals (72%)
2 roots (78%)- 2 roots usually equal in length from apex to cusp, lingual root and canal may be
wider
1 root (22%)
2 canals, 2 foramina (72%)
2 canals, 1 foramen (13%)
1 canal and 1 foramen (9%)
3 canals, 3 foramina (6%)
With maxillary first premolar, ______ perforation is common due to __________ - CORRECT
ANSWER - Mesial
Mesial concavity
Maxillary second molar- most common # of canals/foramen - CORRECT ANSWER - 1 canal
and 1 foramen (75%)
2 canals, 2 foramina (24%)
3 canals (1%)
maxillary first premolars/second premolars have higher incidence of accessory canals -
CORRECT ANSWER - maxillary second premolars
(60%)
, Mandibular first premolar- most common # of canals/foramen - CORRECT ANSWER -1
canal, 1 foramen (73%)
2 canals, 2 foramina (20%)
2 canals, 1 foramen (7%)
_____% of mandibular first premolars have 2 canals - CORRECT ANSWER - 27%
Mandibular second premolar- most common # of canals/foramen - CORRECT ANSWER -1
canal, 1 foramen (86%)
2 canals, 2 foramina (12%)
2 canals, 1 foramen (2%)
Maxillary first molar-most common # of canals/foramen - CORRECT ANSWER - 4 canals, 3
foramina (56%)
3 canals, 3 foramina (42%)
5 canals, 3 foramina (2%)
______________________ has the highest endodontic failure rate - CORRECT ANSWER -
maxillary 1st molar
The DB orifice is found _________________ to the MB orifice - CORRECT ANSWER - 2-
3mm distal and slightly palatal aspect
Maxillary second molar-most common # of canals/foramen - CORRECT ANSWER - 3 roots
(54%), 3 foramen
Mandibular first molar- most common # of canals/foramen - CORRECT ANSWER -
Trapezoidal outline
2 roots 3 canals
2 roots (98%), 3 roots (2%)
ACTUAL Exam Questions and CORRECT
Answers
maxillary central incisor average length is ______. Shape of access opening should be
___________ - CORRECT ANSWER - 22-23mm
Oval-triangular
Maxillary central, lateral, and canine roots have ________ axial inclination - CORRECT
ANSWER - distal
Shape of access opening for maxillary lateral incisor - CORRECT ANSWER - oval
Maxillary canine average length is ___________ and the shape of access opening should be
_________ - CORRECT ANSWER - 26-27mm
oval
Mandibular central incisor- most common # of canals and foramen - CORRECT ANSWER -
1 canal, 1 foramen (70%)
2 canals, 1 foramen (24%)
2 canals, 2 foramina (6%)
When theres 2 canals, the labial canal is the straighter one
Mandibular lateral incisor- most common # of canals/foramen - CORRECT ANSWER -1
canal, 1 foramen (56%)
2 canals, 2 foramina (30%)
2 canals, 1 foramen (14%)
___% of mandibular laterals have 2 canals - CORRECT ANSWER - 44%
,Mandibular canines- most common # of canals/foramen - CORRECT ANSWER - 1 canal
(94%)
2 canals 2 foramina (6%)
Maxillary first premolar- most common # of canals/foramen - CORRECT ANSWER - 2 roots
and 2 canals (72%)
2 roots (78%)- 2 roots usually equal in length from apex to cusp, lingual root and canal may be
wider
1 root (22%)
2 canals, 2 foramina (72%)
2 canals, 1 foramen (13%)
1 canal and 1 foramen (9%)
3 canals, 3 foramina (6%)
With maxillary first premolar, ______ perforation is common due to __________ - CORRECT
ANSWER - Mesial
Mesial concavity
Maxillary second molar- most common # of canals/foramen - CORRECT ANSWER - 1 canal
and 1 foramen (75%)
2 canals, 2 foramina (24%)
3 canals (1%)
maxillary first premolars/second premolars have higher incidence of accessory canals -
CORRECT ANSWER - maxillary second premolars
(60%)
, Mandibular first premolar- most common # of canals/foramen - CORRECT ANSWER -1
canal, 1 foramen (73%)
2 canals, 2 foramina (20%)
2 canals, 1 foramen (7%)
_____% of mandibular first premolars have 2 canals - CORRECT ANSWER - 27%
Mandibular second premolar- most common # of canals/foramen - CORRECT ANSWER -1
canal, 1 foramen (86%)
2 canals, 2 foramina (12%)
2 canals, 1 foramen (2%)
Maxillary first molar-most common # of canals/foramen - CORRECT ANSWER - 4 canals, 3
foramina (56%)
3 canals, 3 foramina (42%)
5 canals, 3 foramina (2%)
______________________ has the highest endodontic failure rate - CORRECT ANSWER -
maxillary 1st molar
The DB orifice is found _________________ to the MB orifice - CORRECT ANSWER - 2-
3mm distal and slightly palatal aspect
Maxillary second molar-most common # of canals/foramen - CORRECT ANSWER - 3 roots
(54%), 3 foramen
Mandibular first molar- most common # of canals/foramen - CORRECT ANSWER -
Trapezoidal outline
2 roots 3 canals
2 roots (98%), 3 roots (2%)
