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Evaluation of the maxillary third molar position and its relationship with the maxillary sinus: a CBCT study

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Abstract

Objectives

The present study investigated the position and relationship of the maxillary third molars to the maxillary sinus. These molars were detected to have a close relationship with the maxillary sinus based on panoramic images, using cone-beam computed tomography (CBCT).

Methods

This retrospective study evaluated 162 impacted third molars from 100 patients that showed a superimposed relationship between the maxillary sinus and third molars on panoramic images obtained from CBCT. CBCT images were used to assess the horizontal (buccopalatal) and vertical positions of the maxillary sinus relative to the maxillary third molars, proximity of the roots to the sinus, and angulation and depth of the third molars. The associations among the angulation, depth of third molars, and horizontal and vertical positions of the maxillary sinus relative to the third molar findings were examined using Chi square tests.

Results

Based on the winter classification, the most frequent tooth position was vertical (59.9 %), followed by mesioangular (14.2 %), distoangular (9.9 %), and others. Most impacted teeth were at the level between the occlusal and cervical levels of the adjacent second molar. Regarding the relationships of the maxillary third molars with the maxillary sinus examined on CBCT, vertical type III (buccal root related with maxillary sinus) (34 %) and horizontal type 2 (maxillary sinus located between roots) (64.8 %) were seen most frequently.

Conclusions

The relationship between the maxillary sinus and third molar roots should be considered during extraction. When a risk of sinus perforation is predicted in an extraction, a presurgical CBCT examination could be valuable.

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Authors and Affiliations

  1. Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Izmir Katip Çelebi University, 35640, Izmir, Turkey

    Omer Demirtas

  2. Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Atatürk University, Erzurum, Turkey

    Abubekir Harorli

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  1. Omer Demirtas
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Correspondence to Omer Demirtas.

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Omer Demirtas and Abubekir Harorli declare that they have no conflict of interest.

Human rights statements and informed consent

All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions. Informed consent was obtained from all patients for being included in the study.

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Demirtas, O., Harorli, A. Evaluation of the maxillary third molar position and its relationship with the maxillary sinus: a CBCT study. Oral Radiol 32, 173–179 (2016). https://doi.org/10.1007/s11282-015-0228-2

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  • DOI: https://doi.org/10.1007/s11282-015-0228-2

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