Prevalence of middle mesial canal and radix entomolaris of mandibular first permanent molars in a western Chinese population: an in vivo cone-beam computed tomographic study

Abstract Background: The aim of this study was to investigate the prevalence of the middle mesial canal (MMC) and radix entomolaris (RE) in mandibular first permanent molars in a western Chinese population using cone-beam computed tomography (CBCT). Methods: A total of 1174 CBCT images of the mandibular first molars were collected from West China Hospital of Stomatology, Sichuan University. The following information was recorded and evaluated: the detection rate and location of the MMC and RE, the curvature of the RE, the canal configuration and bilateral symmetry. Results: The detection rates of the MMC and RE were 3.41% and 25.04%, respectively, as calculated by individuals, and 1.79% and 22.15%, respectively, as calculated by total teeth. The average curvature in the buccolingual (BL) orientation ( 40.63±14.3 9°) was significantly larger than that in the mesiodistal (MD)orientation ( 17.64±7.8 2°) (p<0.05). Of 587 patients, 71.72% (421/587) had bilateral symmetry according to the root canal morphology. The incidence of three-rooted mandibular first molars was higher in males than in females, while the incidence of two-rooted mandibular first molars was higher in females than in males. Conclusions: Our results showed that the RE could be detected in almost 1/4 of the western Chinese population; thus, RE detection requires special attention and careful assessment in endodontic treatment.

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Prevalence of middle mesial canal and radix entomolaris of mandibular first permanent molars in a western Chinese population: an in vivo cone-beam computed tomographic study

10.21203/rs.3.rs-25911/v3 ◽

2020 ◽

Author(s):

Xin Qiao ◽

Hualing Zhu ◽

Yujia Yan ◽

Jinglin Li ◽

Jiayin Ren ◽

...

Keyword(s):

Chinese Population ◽

Bilateral Symmetry ◽

Cone Beam ◽

Detection Rates ◽

Computed Tomographic ◽

Average Curvature ◽

Permanent Molars ◽

Root Canal Morphology ◽

First Permanent Molars

Abstract Background: The aim of this study was to investigate the prevalence of the middle mesial canal (MMC) and radix entomolaris (RE) in mandibular first permanent molars in a western Chinese population using cone-beam computed tomography (CBCT).Methods: A total of 1174 CBCT images of the mandibular first molars were collected from West China Hospital of Stomatology, Sichuan University. The following information was recorded and evaluated: the detection rate and location of the MMC and RE, the curvature of the RE, the canal configuration and bilateral symmetry.Results: The detection rates of the MMC and RE were 3.41% and 25.04%, respectively, as calculated by individuals, and 1.79% and 22.15%, respectively, as calculated by total teeth. The average curvature in the buccolingual (BL) orientation ( 40.63±14.3 9°) was significantly larger than that in the mesiodistal (MD)orientation ( 17.64±7.8 2°) (p<0.05). Of 587 patients, 71.72% (421/587) had bilateral symmetry according to the root canal morphology. The incidence of three-rooted mandibular first molars was higher in males than in females, while the incidence of two-rooted mandibular first molars was higher in females than in males.Conclusions: Our results showed that the RE could be detected in almost 1/4 of the western Chinese population; thus, RE detection requires special attention and careful assessment in endodontic treatment.

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Prevalence of Middle Mesial Canal and Radix Entomolaris of Mandibular First Permanent Molars in a Western Chinese Population: An In Vivo Cone-Beam Computed Tomographic Study

10.21203/rs.3.rs-25911/v1 ◽

2020 ◽

Author(s):

Xin Qiao ◽

Hualing Zhu ◽

Yujia Yan ◽

Jinglin Li ◽

Jiayin Ren ◽

...

Keyword(s):

Chinese Population ◽

Bilateral Symmetry ◽

Cone Beam ◽

Detection Rates ◽

Computed Tomographic ◽

Average Curvature ◽

Permanent Molars ◽

Root Canal Morphology ◽

First Permanent Molars

Abstract Background: The aim of this study was to investigate the prevalence of the middle mesial canal (MMC) and radix entomolaris (RE) in mandibular first permanent molars in a western Chinese population using cone-beam computed tomography (CBCT). Methods: A total of 1174 CBCT images of the mandibular first molars were collected from West China Hospital of Stomatology, Sichuan University. The following information was recorded and evaluated: the detection rate and location of the MMC and RE, the curvature of the RE, the canal configuration and bilateral symmetry. Results: The detection rates of the MMC and RE were 3.41% and 25.04%, respectively, as calculated by individuals, and 1.79% and 22.15%, respectively, as calculated by total teeth. The average curvature in the buccolingual (BL) orientation (40.63±14.39°) was significantly larger than that in the mesiodistal (MD)orientation (17.64±7.82°) (p<0.05). Of 587 patients, 71.72% (421/587) had bilateral symmetry according to the root canal morphology. The incidence of three-rooted mandibular first molars was higher in males than in females, while the incidence of two-rooted mandibular first molars was higher in females than in males. Conclusions: Our results showed that the RE could be detected in almost 1/4 of the western Chinese population; thus, RE detection requires special attention and careful assessment in endodontic treatment.

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Evaluation of the Root and Canal Morphology of Mandibular First Permanent Molars in a Western Chinese Population by Cone-Beam Computed Tomography

Journal of Endodontics ◽

10.1016/j.joen.2010.08.016 ◽

2010 ◽

Vol 36 (11) ◽

pp. 1786-1789 ◽

Cited By ~ 52

Author(s):

Yao Wang ◽

Qing-hua Zheng ◽

Xue-dong Zhou ◽

Lu Tang ◽

Qian Wang ◽

...

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Chinese Population ◽

Cone Beam ◽

Permanent Molars ◽

First Permanent Molars ◽

Canal Morphology

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Root Anatomy and Canal Configuration of Maxillary Molars in a Brazilian Subpopulation: A 125-μm Cone-Beam Computed Tomographic Study

European Journal of Dentistry ◽

10.1055/s-0039-1688736 ◽

2019 ◽

Vol 13 (01) ◽

pp. 082-087 ◽

Cited By ~ 3

Author(s):

Nelson Tsutomu Mohara ◽

Marcelo Santos Coelho ◽

Nathalia Valle de Queiroz ◽

Marcelle Louise Sposito Borreau ◽

Marko Massao Nishioka ◽

...

Keyword(s):

Anatomical Variations ◽

Root Anatomy ◽

Cone Beam ◽

Type I ◽

Tomographic Images ◽

Root Canals ◽

Computed Tomographic ◽

Maxillary Molars ◽

Permanent Molars

Abstract Objective Knowledge of internal anatomy of the teeth is of great importance in endodontics, leading to success in root canal therapy (RCT). The aim of this study was to assess the root anatomy and canal configuration of maxillary molars in a Brazilian subpopulation using tomographic images using a voxel size of 125 μm. Materials and Methods This in vivo retrospective study assessed 651 cone-beam computed tomographic scans from 328 maxillary first molars and 323 maxillary second molars. The images were assessed by two endodontists and an oral radiologist. Only permanent molars with fully developed roots and with no signs of RCT were included. Results Maxillary first and second molars presented three separated roots in 99.39 and 90.09% of the cases, respectively. The presence of mesiolingual canals in the mesiobuccal roots was 64.22% for maxillary first molars and 33.56% for maxillary second molars. Distobuccal canals in the maxillary first and second molars presented Vertucci's Type I configuration in 99.39 and 99.66%, respectively, and palatal canals in the maxillary first and second molars presented Vertucci's Type I configuration in 99.69 and 99.68%, respectively. Maxillary second molars were more subjected to anatomical variations than first molars. Female patients presented higher prevalence of mesiolingual canals in the maxillary second molars. Conclusions The most prevalent morphology in the maxillary first and second molars was three root canals. The presence of only one or two roots is more likely to occur in the maxillary second molars than in the maxillary first molars. Mesiolingual canals in mesiobuccal roots are more frequent in the maxillary first molars than in the maxillary second molars, and the occurrence of two distobuccal or two palatal canals is rare.

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