Comparison of panoramic radiography and CBCT to identify maxillary posterior roots invading the maxillary sinus.
OBJECTIVE
Given the limitations of panoramic radiography for assessing topographic relationship of maxillary teeth with sinus floor, the purpose of this study was to assess signs on panoramic radiography that could predict root protrusion into the sinus.


METHODS
A total of 46 individuals (330 maxillary posterior teeth) who underwent panoramic radiography and CBCT were enrolled. The relationship between the posterior teeth and the maxillary sinus and panoramic radiography signs (projection of the root apices, interruption of the maxillary sinus floor, lamina dura, darkening in the root apices, and superiorly curving sinus floor enveloping the associated tooth root) associated with protrusion of root apices into the sinus were evaluated.


RESULTS
There were differences between the imaging modalities about the positioning of the root apices regarding the sinus (p < 0.05). Only the projecting of the root apices and the interruption of the sinus floor on panoramic radiography were predictors for the root protrusion (p < 0.05). No significant association was observed for the other panoramic radiography signs (p > 0.05).


CONCLUSIONS
The root projection into the sinus and the interruption of the sinus floor are indicative signs of root protrusion into the sinus on CBCT.
Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, São Paulo, Brazil.
Luciana J
LJ
Lopes
Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, São Paulo, Brazil.
Thiago O
TO
Gamba
Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, São Paulo, Brazil.
João V J
JV
Bertinato
Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, São Paulo, Brazil.
Deborah Q
DQ
Freitas
D001641:Bicuspid / Q000000981:diagnostic imaging; D054893:Cone-Beam Computed Tomography / Q000706:statistics & numerical data*; D006801:Humans; D008443:Maxillary Sinus / Q000000981:diagnostic imaging*; D008963:Molar / Q000000981:diagnostic imaging; D008964:Molar, Third / Q000000981:diagnostic imaging; D011237:Predictive Value of Tests; D019252:Radiography, Dental, Digital / Q000706:statistics & numerical data; D011862:Radiography, Panoramic / Q000706:statistics & numerical data*; D019227:Tooth Apex / Q000000981:diagnostic imaging*; D014092:Tooth Root / Q000000981:diagnostic imaging
CBCT; maxillary sinus; molar; panoramic radiography; tooth apex