Cone-beam computed tomography observation of maxillary first premolar canal shapes

Abstract

A variety of shapes has been reported for the roots and root canals of maxillary first premolars. The purposes of the present study were to determine branching and shapes of the roots of maxillary first premolars, as well as age-related changes using slice images obtained with cone-beam computed tomography (CBCT) for dental use. CBCT-reconstructed images of 125 cases that included maxillary first premolars were used as subjects. Slice images at the cervical one-third, center, and apical one-third positions of the root were prepared. Root branching and number of root canals was determined at each measurement position in the images. The subjects were divided into three groups: younger than 30 years, 30 to 50 years, and over 50 years. The root canal morphology was compared among these age groups. Single-rooted premolars were the most frequent. As for number of root canals, a single-canal premolar was observed at the position of the cervical one-third in 33.6%, at the center in 35.2%, and at the apical one-third in 56.0%. Thereafter the subjects were divided into groups by age, namely, younger than 30 years, 30 to 50 years, and over 50 years old, and it was revealed that the ratio of the two-canal type increased with age. In regard to tooth morphology, it was confirmed that the two-canal type shows more frequent occurrence with aging in maxillary first premolar. Based on our findings, we consider that CBCT can be useful for determining the root canal morphology with complicated shapes.

Observation of mandibular second molar roots and root canal morphology using dental cone-beam computed tomography

“…CBCT images were obtained with scanning performed for 18 seconds at 80 kV and 5 mA. Inclusion criteria for the analyzed samples were as follows [ 17 ]:…”

“…For studies of root morphology and internal anatomical structures of teeth, extracted teeth have been used [1][2][3][4][5][6][7], as well as transparent root canal models [1][2][3][4][5] and molding samples [6] when examining the number of root canals. Recently, dental cone-beam computed tomography (CBCT) has come to be frequently used in clinical settings to determine the number of root canals as well as morphology, with several reports of morphologic observation findings of hard tissues using CBCT presented [8][9][10][11][12][13][14][15][16][17].…”

Accuracy verification of dental cone-beam computed tomography of mandibular incisor root canals and assessment of its morphology and aging-related changes

“…Cone beam computed tomography (CBCT) has recently been employed in dental diagnosis, aiding observation of the internal struc-Original Article https://doi.org/10.5115/acb. 22.247 pISSN 2093-3665 eISSN 2093-3673 ture of hard tissues [2][3][4][5][6][8][9][10][11][12][13][14]. Further, the effective dose of CBCT is lower than that of multislice CT [15].…”

“…Although, micro-computed tomography (micro-CT) provides accurate, high-resolution images, it is mostly used for in vitro studies considering the cumulative radiation [ 7 ]. Cone beam computed tomography (CBCT) has recently been employed in dental diagnosis, aiding observation of the internal structure of hard tissues [ 2 - 6 , 8 - 14 ]. Further, the effective dose of CBCT is lower than that of multislice CT [ 15 ].…”

Dental characteristics on panoramic radiographs as parameters for non-invasive age estimation: a pilot study

“…Attrition degree methods are typically non-invasive and can be applied to living individuals [ 9 - 12 ]. The degree of secondary dentine deposition can be indirectly evaluated by measuring the volume reduction of the pulp chamber and canal observed on radiographs [ 13 , 14 ]. Kvaal’s method [ 15 ] is widely known and used, and modified versions of Kvaal’s method, such as Paewinsky et al’s [ 16 ] and Roh et al’s [ 17 ] methods, are also frequently used in forensic practice.…”