Abstract
This study aimed to examine the prevalence of molar roots protruding into the maxillary
sinus and to determine the panoramic radiographic signs as correlated with cone beam
computed tomography (CBCT). CBCT images of 354 roots were assessed and classified
into three types, according to the relationship between the root and maxillary sinus.
The prevalence of root protrusion into the maxillary sinus was calculated then the
panoramic images assessed. After excluding some unidentified roots on the panoramic
images, 200 were investigated for panoramic signs, including (i) projection of the
root apex into the sinus cavity, (ii) interruption of the maxillary sinus floor’s
cortex, (iii) absence of periodontal ligament space, (iv) darkening of the involved
root region, and (v) upward curving of the sinus floor. The respective correlation
between the panoramic signs and CBCT types was assessed. Forty-six percent of roots
showed protrusion into the sinus with the palatal root of the first molar having the
greatest prevalence (33/200 roots). The panoramic signs ‘projection of the root apex
in the sinus cavity’ and ‘darkening of the involved root apical region’ both strongly
indicated root protrusion into the maxillary sinus (P < 0.05).
Key words
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Article info
Publication history
Published online: June 21, 2019
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© 2019 International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.
