NBDE part 2- Endodontics Exam 2025 Questions and Answers

NBDE part 2- Endodontics Exam
2025 Questions and Answers


maxillary central incisor average length is ______. Shape of access opening should be

___________ - ANSWER✔✔-22-23mm


Oval-triangular


Maxillary central, lateral, and canine roots have ________ axial inclination -

ANSWER✔✔-distal


Shape of access opening for maxillary lateral incisor - ANSWER✔✔-oval


Maxillary canine average length is ___________ and the shape of access opening should

be _________ - ANSWER✔✔-26-27mm


oval


Mandibular central incisor- most common # of canals and foramen - 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 - ANSWER✔✔-1 canal, 1

foramen (56%)


2 canals, 2 foramina (30%)


2 canals, 1 foramen (14%)


___% of mandibular laterals have 2 canals - ANSWER✔✔-44%


Mandibular canines- most common # of canals/foramen - ANSWER✔✔-1 canal (94%)


2 canals 2 foramina (6%)


Maxillary first premolar- most common # of canals/foramen - 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 __________ -

ANSWER✔✔-Mesial


Mesial concavity


Maxillary second molar- most common # of canals/foramen - 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 -

ANSWER✔✔-maxillary second premolars


(60%)


Mandibular first premolar- most common # of canals/foramen - ANSWER✔✔-1 canal,

1 foramen (73%)


2 canals, 2 foramina (20%)


2 canals, 1 foramen (7%)


_____% of mandibular first premolars have 2 canals - ANSWER✔✔-27%

, Mandibular second premolar- most common # of canals/foramen - ANSWER✔✔-1

canal, 1 foramen (86%)


2 canals, 2 foramina (12%)


2 canals, 1 foramen (2%)


Maxillary first molar-most common # of canals/foramen - ANSWER✔✔-4 canals, 3

foramina (56%)


3 canals, 3 foramina (42%)


5 canals, 3 foramina (2%)


______________________ has the highest endodontic failure rate - ANSWER✔✔-

maxillary 1st molar


The DB orifice is found _________________ to the MB orifice - ANSWER✔✔-2-3mm

distal and slightly palatal aspect


Maxillary second molar-most common # of canals/foramen - ANSWER✔✔-3 roots

(54%), 3 foramen


Mandibular first molar- most common # of canals/foramen - ANSWER✔✔-Trapezoidal

outline


2 roots 3 canals


2 roots (98%), 3 roots (2%)