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Coronal root canal morphology of permanent two-rooted mandibular first molars with novel 3D measurements.

Abstract

AIM

To measure the coronal root canal morphology of permanent mandibular first molars using 3D coordinates for more precise conservative endodontic cavity preparation.

METHODOLOGY

In total, 57 cone beam computed tomography (CBCT) images of sound mandibular molars with fully formed apices without previous endodontic treatment were taken from 33 patients aged 16 to 75 years. The CBCT machine (MCT-1[EX-2F], J. Morita Manufacturing Corp, Kyoto, Japan) provided 14-bit greyscale images with the voxel size of 0.125 mm. All images were taken at 80 kV and 5.0 mA, with a 17-s exposure time, which were then reconstructed in 3D models and viewed by an endodontist. The gender of the patients and the tooth position, and number of root canals, were recorded. The landmarks of coronal root canals were determined, then the distribution of landmarks, maximum curvature in the axial direction and curvature directions in the horizontal direction of coronal root canals were measured. Distributions of landmarks were analysed using a spatial statistics method. Data about curvature were compared using a t test.

RESULTS

Overall, the distribution of root canal orifices and the centre of the canal primary curve were more centralized than other landmarks. The landmarks were located more mesiobuccally to the centre of the occlusal plane of mandibular first molars. Specifically, the measurements of the maximum curvature of coronal root canals in the axial direction were as follows: in 3-canal teeth, the average angles of curvatures were 22°,23°,15° for mesiobuccal (MB), mesiolingual (ML) and distobuccal (DB) canals, respectively; in 4-canal teeth, the average angles of curvatures were 24°,26°,15°,22°for MB, ML, DB and distolingual (DL) canals, respectively. The degrees of coronal root canal curvatures in the horizontal direction were as follows: in 3-canal teeth, the average angles of curvatures were -8°,47°,-2° for MB, ML and DB canals, respectively; in 4-canals teeth, the average angles were -11°,50°,-28°,45° for MB, ML, DB and DL canals, respectively. Statistically, there was no reliable side or sex difference in any of the measurements (P > 0.05).

CONCLUSIONS

In permanent two-rooted mandibular first molars, the coronal canals clustered in the direction of the mesiobuccal side of the occlusal surface of the teeth.

Authors+Show Affiliations

State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Cariology and Endodontics West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan Province, China.State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Cariology and Endodontics West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan Province, China.State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Cariology and Endodontics West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan Province, China.State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Cariology and Endodontics West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan Province, China.State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Cariology and Endodontics West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan Province, China.State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Cariology and Endodontics West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan Province, China.State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Cariology and Endodontics West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan Province, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31519062

Citation

Fu, Y, et al. "Coronal Root Canal Morphology of Permanent Two-rooted Mandibular First Molars With Novel 3D Measurements." International Endodontic Journal, 2019.
Fu Y, Deng Q, Xie Z, et al. Coronal root canal morphology of permanent two-rooted mandibular first molars with novel 3D measurements. Int Endod J. 2019.
Fu, Y., Deng, Q., Xie, Z., Sun, J., Song, D., Gao, Y., & Huang, D. (2019). Coronal root canal morphology of permanent two-rooted mandibular first molars with novel 3D measurements. International Endodontic Journal, doi:10.1111/iej.13220.
Fu Y, et al. Coronal Root Canal Morphology of Permanent Two-rooted Mandibular First Molars With Novel 3D Measurements. Int Endod J. 2019 Sep 13; PubMed PMID: 31519062.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Coronal root canal morphology of permanent two-rooted mandibular first molars with novel 3D measurements. AU - Fu,Y, AU - Deng,Q, AU - Xie,Z, AU - Sun,J, AU - Song,D, AU - Gao,Y, AU - Huang,D, Y1 - 2019/09/13/ PY - 2019/05/13/received PY - 2019/09/09/accepted PY - 2019/9/14/pubmed PY - 2019/9/14/medline PY - 2019/9/14/entrez KW - canal curvature KW - cone beam computed tomography KW - mandibular first molar KW - modern endodontic access KW - root and canal anatomy KW - three-dimensional reconstruction JF - International endodontic journal JO - Int Endod J N2 - AIM: To measure the coronal root canal morphology of permanent mandibular first molars using 3D coordinates for more precise conservative endodontic cavity preparation. METHODOLOGY: In total, 57 cone beam computed tomography (CBCT) images of sound mandibular molars with fully formed apices without previous endodontic treatment were taken from 33 patients aged 16 to 75 years. The CBCT machine (MCT-1[EX-2F], J. Morita Manufacturing Corp, Kyoto, Japan) provided 14-bit greyscale images with the voxel size of 0.125 mm. All images were taken at 80 kV and 5.0 mA, with a 17-s exposure time, which were then reconstructed in 3D models and viewed by an endodontist. The gender of the patients and the tooth position, and number of root canals, were recorded. The landmarks of coronal root canals were determined, then the distribution of landmarks, maximum curvature in the axial direction and curvature directions in the horizontal direction of coronal root canals were measured. Distributions of landmarks were analysed using a spatial statistics method. Data about curvature were compared using a t test. RESULTS: Overall, the distribution of root canal orifices and the centre of the canal primary curve were more centralized than other landmarks. The landmarks were located more mesiobuccally to the centre of the occlusal plane of mandibular first molars. Specifically, the measurements of the maximum curvature of coronal root canals in the axial direction were as follows: in 3-canal teeth, the average angles of curvatures were 22°,23°,15° for mesiobuccal (MB), mesiolingual (ML) and distobuccal (DB) canals, respectively; in 4-canal teeth, the average angles of curvatures were 24°,26°,15°,22°for MB, ML, DB and distolingual (DL) canals, respectively. The degrees of coronal root canal curvatures in the horizontal direction were as follows: in 3-canal teeth, the average angles of curvatures were -8°,47°,-2° for MB, ML and DB canals, respectively; in 4-canals teeth, the average angles were -11°,50°,-28°,45° for MB, ML, DB and DL canals, respectively. Statistically, there was no reliable side or sex difference in any of the measurements (P > 0.05). CONCLUSIONS: In permanent two-rooted mandibular first molars, the coronal canals clustered in the direction of the mesiobuccal side of the occlusal surface of the teeth. SN - 1365-2591 UR - https://www.unboundmedicine.com/medline/citation/31519062/Coronal_Root_Canal_Morphology_of_Permanent_Two-rooted_Mandibular_First_Molars_with_Novel_3D_Measurements L2 - https://doi.org/10.1111/iej.13220 DB - PRIME DP - Unbound Medicine ER -