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Root canals in one‐rooted maxillary second molars
Author(s) -
Carlsen Ole,
Alexandersen Verner,
Heitmann Thomas,
Jakobsen Parly
Publication year - 1992
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.1992.tb01067.x
Subject(s) - root canal , molar , coronal plane , dentistry , stereo microscope , orthodontics , medicine , anatomy
The Royal Dental College, Copenhagen, houses an extensive collection of human teeth extracted in Denmark. The collection currently contains 104 one‐rooted, permanent maxillary second molars. The root complex on these teeth was sectioned at the junction between the coronal and the apical halves, i.e. mid‐root, and at the junction between the middle and the apical thirds, i.e. apically. Using a stereomicroscope we then registered, mid‐root and apically, the following variables: canal number, canal position, and canal cross‐section. Mid‐root there was 1 centrally located root canal in 25.96% of the teeth examined; 2 canals were observed either mesially and distofacially, mesiofacially and distally, or facially and lingually in 34.62%; 3 canals positioned mesiofacially, distofacially, and lingually were found in 39.42%. At the same level 63.51% of the canal cross‐sections were non‐circular, whereas 36.49% of the canals had a circular cross‐section image. The non‐circular canal cross‐sections could more specifically be characterized as C‐shaped, Y‐shaped, hourglass‐shaped or the root canal had a greater faciolingual than mesiodistal extension or, respectively, a greater mesiodistal than faciolingual extension. Apically there was 1 centrally located root canal in 35.58%; 2 canals were observed with a position either mesially and distofacially, mesiofacially and distally, or facially and lingually in 37.49%; 3 canals located mesiofacially, distofacially, and lingually were found in 26.92%. At the apical level, 64.32%. of the root canal cross‐sections were non‐circular, whereas 35.68% of the canals showed a circular cross‐section. The results presented here are aimed at: clinical dentists, endodontists, and dental morphologists.