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Prevalence and features of distolingual roots in mandibular molars analyzed by cone-beam computed tomography.

Choi MR, Moon YM, Seo MS - Imaging Sci Dent (2015)

Bottom Line: Cone-beam computed tomographic images of 264 patients were screened and examined.Pearson's chi-square test, the paired t-test, one-way analysis of variance, and post-hoc analysis were performed.No correlation was found between the presence of a distolingual root in the mandibular first molar and the presence of a C-shaped canal in the mandibular second molar.

View Article: PubMed Central - PubMed

Affiliation: Department of Conservative Dentistry, Wonkang University Daejeon Dental Hospital, Daejeon, Korea.

ABSTRACT

Purpose: This study evaluated the prevalence of distolingual roots in mandibular molars among Koreans, the root canal system associated with distolingual roots, and the concurrent appearance of a distolingual root in the mandibular first molar and a C-shaped canal in the mandibular second molar.

Materials and methods: Cone-beam computed tomographic images of 264 patients were screened and examined. Axial sections of 1056 mandibular molars were evaluated to determine the number of roots. The interorifice distances from the distolingual canal to the distobuccal canal were also estimated. Using an image analysis program, the root canal curvature was calculated. Pearson's chi-square test, the paired t-test, one-way analysis of variance, and post-hoc analysis were performed.

Results: Distolingual roots were observed in 26.1% of the subjects. In cases where a distolingual root was observed in the mandibular molar, a significant difference was observed in the root canal curvature between the buccolingual and mesiodistal orientations. The maximum root canal curvature was most commonly observed in the mesiodistal orientation in the coronal portion, but in the apical portion, maximum root canal curvature was most often observed in the buccolingual orientation.

Conclusion: The canal curvature of distolingual roots was found to be very complex, with a different direction in each portion. No correlation was found between the presence of a distolingual root in the mandibular first molar and the presence of a C-shaped canal in the mandibular second molar.

No MeSH data available.


Mandibular molars with a distolingual root visible in the axial section. A. Bilateral occurrence, B. Unilateral occurrence.
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Figure 1: Mandibular molars with a distolingual root visible in the axial section. A. Bilateral occurrence, B. Unilateral occurrence.

Mentions: Digital Imaging and Communications in Medicine (DICOM) images with a 1-mm slice thickness were imported and prepared using the Asahivision software (Asahi Roentgen Co., Nagoya, Japan). The images were analyzed by two investigators in two sessions, with a one-month interval between the sessions. Teeth were classified as having a DL root if the DL root was clearly visible on serial axial CBCT images (Fig. 1).


Prevalence and features of distolingual roots in mandibular molars analyzed by cone-beam computed tomography.

Choi MR, Moon YM, Seo MS - Imaging Sci Dent (2015)

Mandibular molars with a distolingual root visible in the axial section. A. Bilateral occurrence, B. Unilateral occurrence.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4697006&req=5

Figure 1: Mandibular molars with a distolingual root visible in the axial section. A. Bilateral occurrence, B. Unilateral occurrence.
Mentions: Digital Imaging and Communications in Medicine (DICOM) images with a 1-mm slice thickness were imported and prepared using the Asahivision software (Asahi Roentgen Co., Nagoya, Japan). The images were analyzed by two investigators in two sessions, with a one-month interval between the sessions. Teeth were classified as having a DL root if the DL root was clearly visible on serial axial CBCT images (Fig. 1).

Bottom Line: Cone-beam computed tomographic images of 264 patients were screened and examined.Pearson's chi-square test, the paired t-test, one-way analysis of variance, and post-hoc analysis were performed.No correlation was found between the presence of a distolingual root in the mandibular first molar and the presence of a C-shaped canal in the mandibular second molar.

View Article: PubMed Central - PubMed

Affiliation: Department of Conservative Dentistry, Wonkang University Daejeon Dental Hospital, Daejeon, Korea.

ABSTRACT

Purpose: This study evaluated the prevalence of distolingual roots in mandibular molars among Koreans, the root canal system associated with distolingual roots, and the concurrent appearance of a distolingual root in the mandibular first molar and a C-shaped canal in the mandibular second molar.

Materials and methods: Cone-beam computed tomographic images of 264 patients were screened and examined. Axial sections of 1056 mandibular molars were evaluated to determine the number of roots. The interorifice distances from the distolingual canal to the distobuccal canal were also estimated. Using an image analysis program, the root canal curvature was calculated. Pearson's chi-square test, the paired t-test, one-way analysis of variance, and post-hoc analysis were performed.

Results: Distolingual roots were observed in 26.1% of the subjects. In cases where a distolingual root was observed in the mandibular molar, a significant difference was observed in the root canal curvature between the buccolingual and mesiodistal orientations. The maximum root canal curvature was most commonly observed in the mesiodistal orientation in the coronal portion, but in the apical portion, maximum root canal curvature was most often observed in the buccolingual orientation.

Conclusion: The canal curvature of distolingual roots was found to be very complex, with a different direction in each portion. No correlation was found between the presence of a distolingual root in the mandibular first molar and the presence of a C-shaped canal in the mandibular second molar.

No MeSH data available.