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. 2020 Jun 3;48(6):0300060520926896. doi: 10.1177/0300060520926896

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© The Author(s) 2020

Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 3. — Schematics and cone-beam computed tomography views of four types of relationships in coronal and sagittal planes. Yellow line indicates measurement of distance from molar to sinus floor. Type I, absence of root contact with the sinus border and presence of maxillary sinus cross-section above the root apex; type II, absence of root contact with the sinus border, with lateral projection on the sinus cavity accompanied by an inferiorly curving sinus floor; type III, root apex contact with the maxillary sinus (touching or tangentially); and type IV, root apex intrusion into the maxillary sinus.