Identification of apical and cervical curvature radius of human molars
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Data
2015
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Resumo
To determine the frequency of apical and cervical curvatures in human molars using the
radius method and cone-beam computed tomography (CBCT) images. Four hundred images
of mandibular and maxillary first and second molars were selected from a database of CBCT
exams. The radius of curvature of curved root canals was measured using a circumcenter
based on three mathematical points. Radii were classified according to the following
scores: 0 - straight line; 1 - large radius (r>8 mm, mild curvature); 2 - intermediate radius
(r>4 and r<8 mm, moderate curvature); and 3 - small radius (r≤4 mm, severe curvature).
The frequency of curved root canals was analyzed according to root canal, root thirds,
and coronal and sagittal planes, and assessed using the chi-square test (significance at
α=0.05). Of the 1,200 evaluated root canals, 92.75% presented curved root canals in
the apical third and 73.25% in the cervical third on coronal plane images; sagittal plane
analysis yielded 89.75% of curved canals in the apical third and 77% in the cervical third.
Root canals with a large radius were significantly more frequent when compared with
the other categories, regardless of root third or plane. Most root canals of maxillary and
mandibular first and second molars showed some degree of curvature in the apical and
cervical thirds, regardless of the analyzed plane (coronal or sagittal).
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Palavras-chave
Root canal anatomy, Cone-beam computed tomography, Curvature radius, Root canal preparation, Root canal curvature
Citação
ESTRELA, Carlos et al. Identification of apical and cervical curvature radius of human molars. Brazilian Dental Journal, Ribeirão Preto, v. 26, n. 4, p. 351-356, 2015.