A study of the distobuccal root canal orifice of the maxillary second
molars in Chinese individuals evaluated by cone-beam computed
tomography |
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Authors: | Xuan HAN Haibing YANG Guoju LI Lin YANG Cheng TIAN Yan WANG |
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Institution: | 1. DDS, Department of Endodontics, School of Stomatology, Shandong University; Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan, China.;2. PhD, DDS, Department of Endodontics, School of Stomatology, Shandong University; Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan, China. |
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Abstract: | As is commonly understood, the root canal morphology of the maxillary molars is
usually complex and variable. It is sometimes difficult to detect the distobuccal
root canal orifice of a maxillary second molar with root canal treatment. No
literature related to the distobuccal root canals of the maxillary second molars has
been published.ObjectiveTo investigate the position of the distobuccal root canal orifice of the maxillary
second molars in a Chinese population using cone-beam computed tomography (CBCT).
Material and methodsIn total, 816 maxillary second molars from 408 patients were selected from a
Chinese population and scanned using CBCT. The following information was recorded:
(1) the number of root canals per tooth, (2) the distance between the mesiobuccal
and distobuccal root canal orifice (DM), (3) the distance between the palatal and
distobuccal root canal orifice (DP), (4) the angle formed by the mesiobuccal,
distobuccal and palatal root canal orifices (∠ PDM). DM, DP and ∠
PDM of the teeth with three or four root canals were analyzed and evaluated. ResultsIn total, 763 (93.51%) of 816 maxillary second molars had three or four root
canals. The distance between the mesiobuccal and distobuccal orifice was 0.7 to
4.8 mm. 621 (81.39%) of 763 teeth were distributed within 1.5-3.0 mm. The distance
between the palatal and distobuccal orifice ranged from 0.8 mm to 6.7 mm; 585
(76.67%) and were distributed within 3.0-5.0 mm. The angle (∠ PDM) ranged
from 69. 4º to 174.7º in 708 samples (92.80%), the angle ranged from 90º to 140º.
ConclusionsThe position of the distobuccal root canal orifice of the maxillary second molars
with 3 or 4 root canals in a Chinese population was complex and variable.
Clinicians should have a thorough knowledge of the anatomy of the maxillary second
molars. |
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Keywords: | Cone-beam computed tomography Distobuccal root canal Maxillary second molar Root and canal anatomy |
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