Incidence of Middle Mesial Canals Based on Distance between Mesial Canal Orifices in Mandibular Molars: A Clinical and Cone-beam Computed Tomographic Analysis

Weinberg, Eric M; Pereda, Alejandro E; Khurana, Sonam; Lotlikar, Priti P; Falcon, Carla; Hirschberg, Craig

doi:10.1016/j.joen.2019.10.017

Cited by 22 publications

(24 citation statements)

References 6 publications

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“…Some studies report that middle mesial canals are located equidistant to both the main canals, whereas other studies report that these canals are closer to one of the main canals. The results of this study also revealed no marked difference in the distance between the mesiobuccal-middle mesial ori ces and the mesiolingual-middle mesial ori ces based on the above classi cations, and a previous study reported similar results [31]. This measurement might help clinicians locate the MMC position.…”

Section: Discussionsupporting

confidence: 79%

Classification and morphology of middle mesial canals of mandibular first molars in a Southern Chinese subpopulation: a cone-beam computed tomographic study

Yang

Chen

Zeng

et al. 2020

Preprint

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Background: Cone-beam computed tomography (CBCT) was employed to study the morphology and curvature of middle mesial canals (MMCs) of mandibular first molars (MFMs).Methods: CBCT scanning was performed on MFMs of 1100 patients. Patients' images that met the inclusion criteria were divided into group A (<40 years old) and group B (≥40 years old) for further study. The images were used to study the incidence of MMCs at different ages, measure the curvature of MMCs in the mesiodistal and buccolingual directions using the Schneider method, and observe the anatomical morphology of the mesial root canal system.Results: In 875 patients, 1750 MFM images met the inclusion criteria. Among these cases, 158 MFMs contained an MMC, yielding an incidence rate of 9.03%. The incidence rate of MMCs was 11.22% in group A and 6.61% in group B, and this difference was statistically significant (P<0.05). The curvature in the mesiodistal direction was 29.39±8.53º in group A and 26.06±8.50º in group B, and this difference was also significant (P<0.05). The curved regions in groups A and B were often located in the middle 1/3 of canal. No significant difference in the distance between MMC orifices and mesiobuccal canal orifices or mesiolingual canal orifices was noted (P>0.05). The most common mesial root canal morphological type was type II (3-2) (53.80%). Conclusion: The incidence of MMCs in MFMs declined as age increased. The canal systems of MMCs were varied and complex, mainly exhibiting an obvious mesiodistal curve. CBCT is an outstanding method to help guide root canal therapy.

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Section: Discussionsupporting

confidence: 79%

Classification and morphology of middle mesial canals of mandibular first molars in a Southern Chinese subpopulation: a cone-beam computed tomographic study

Yang

Chen

Zeng

et al. 2020

Preprint

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“…Some research articles report the middle mesial canals to be located equidistant to both the main canals, while others report it to be closer to one of the main canals. The results of this study also showed that there were no marked difference in the distance between the mesiobuccal -middle mesial orifices and the mesiolingual -middle mesial orifices from the above classifications, the result is same of the previous study [31]. This measurement might help clinicians in locating the MMCs position.…”

Section: Tablesupporting

confidence: 72%

Classification and morphology of middle mesial canals of mandibular first molars in a Southern Chinese subpopulation: a cone-beam computed tomographic study

Yang

Chen

Zeng

et al. 2020

Preprint

View full text Add to dashboard Cite

Background：Cone-beam computed tomography (CBCT) was used to study the morphology and curvature of the middle mesial canals (MMCs) of the mandibular first molars (MFMs).Methods：CBCT scanning was performed on the MFMs of 1100 patients. The pa tients' images which met the inclusion criteria were divided into group A (<40 years old) and group B (≥40 years old) for further study. To study the incidence of the MMCs at different ages, to measure the curvature of MMCs of mesiodistal and buccolingual direction by Schneider method, and to observe the anatomical morphology of the mesial root canal system.Results：In 875 patients, 1750 MFM images met the inclusion criteria, among which 158 MFMs contained a MMC, with an incidence rate of 9.03%. The incidence rate of MMCs was 11.22% in group A and 6.61% in group B, with statistically significant differences (P<0.05). The curvature in group A was 29.39±8.53° in mesiodistal direction while group B was 26.06±8.50 °, with statistical differences (P＜0.05). It has been shown that curved regions in group A and B were often found out in the middle 1/3. There is no significant difference in the distance between MMC orifices and mesiobuccal canal orifices or mesiolingual canal orifices (P>0.05). The most common mesial root canal morphology type was type II (3-2) (53.80%). Conclusion：The incidence of MMCs in MFMs was showed to decline along with the increase of age. The canal system of MMCs was varied and complex, mostly with mesiodistal curve obviously. CBCT is an outstanding assistant examination to the root canal therapy.

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“…These distances were obviously longer than those detected by Versiani et al [13], who found that the average distances were 1.35 mm and 1.34 mm, respectively. In addition, Akbarzadeh et al [42] showed that in molars with MMC, the mean distance between the MBC and MLC orifice was 3.1 mm, while the distance was 3.7 mm in those without MMC; But in a most recent study, [43] that the mean distance between the mesial canals was 3.643 mm in teeth with MMC, and 3.818 mm in teeth without MMC, and Weinberg et al suggested that there is no significant difference between above-mentioned distance in molars with or without MMC. But these distances are also apparently shorter than those detected in our study.…”

Section: Discussionmentioning

confidence: 95%

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

et al. 2020

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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 prevalence of threerooted mandibular first molars was higher in males than in females, while the prevalence 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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Incidence of Middle Mesial Canals Based on Distance between Mesial Canal Orifices in Mandibular Molars: A Clinical and Cone-beam Computed Tomographic Analysis

Cited by 22 publications

References 6 publications

Classification and morphology of middle mesial canals of mandibular first molars in a Southern Chinese subpopulation: a cone-beam computed tomographic study

Classification and morphology of middle mesial canals of mandibular first molars in a Southern Chinese subpopulation: a cone-beam computed tomographic study

Classification and morphology of middle mesial canals of mandibular first molars in a Southern Chinese subpopulation: a cone-beam computed tomographic study

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

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