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Research Article

Detecting the Second Mesiobuccal Canal in Maxillary Molars in a Saudi Arabian Population: A Micro-CT Study

Table 2

Distribution (percentage) of the extracanal observation level, canal configuration, and presence of isthmus in the mesiobuccal root of maxillary first and second molars.

Extracanal detectionCanal ConfigurationPresence of isthmus
0 mm1 mm2 mm>2 mmIndependentConfluentFinOverallCoronalMiddleApical

First molar ()24 (70)5 (15)1 (3)4 (12)10 (29.4)21 (61.8)3 (8.8)33/34 (97)32/34 (94)27/34 (79)14/34 (41)
Second molar ()17 (61)5 (18)5 (18)1 (3)8 (28.6)18 (64.2)2 (7.2)28/28 (100)22/28 (79)14/28 (50)6/28 (21)