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Interaction effect of tegmen tympani and superior semicircular canal statuses on the thickness of the roof of the glenoid fossa: a cross-sectional descriptive study

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Abstract

Purpose

Homogeneous development of temporal bone structures is explained by their ontogenic origin; tegmen tympani (TT) and superior semicircular canal (SSC) are related with the glenoid fossa at the temporomandibular joint (TMJ). Therefore, our objective was to determine a possible relationship between TT status (dehiscence or integrity) and the roof of the glenoid fossa (RGF) thickness; SSC status has also been considered.

Methods

This cross-sectional descriptive study was conducted in two tertiary hospitals on 95 patients (109 ears) presenting hypoacusia, facial palsy, vertigo, tinnitus, and other single or combined symptoms, and submitted to a thin-section multidetector-row computed axial tomography (CT) scan.

Results

A significant interaction effect of TT × SSC statuses on RGF thickness was found (p = 0.049). A significant difference in RGF thickness was found only for SSC integrity status between TT integrity and TT dehiscence (p = 0.004). The TT dehiscence increased the risk for RGF dehiscence 12.047 times (p = 0.002).

Conclusions

There is an interaction effect of the statuses of both TT and SSC on the thickness of the RGF, instead of an independent effect of the TT status. When RGF dehiscence is found, TT and SSC statuses should be assessed, to discard associated dehiscences.

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Authors and Affiliations

Authors

Contributions

Protocol/project development: JW, AIC, MAC. Data collection and management: JW, JJF, MAC, RC, AW, LVM. Data analysis: JW, MTT. Manuscript writing/edition: JW, AIC, JJF, AW,RC, LVM, MAC, MTT.

Corresponding author

Correspondence to María Teresa Tejedor.

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The authors declare that they have no conflict of interest.

Research involving human participants

The present study was performed following the guidelines of the Helsinki Declaration of 1983. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committees.

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A signed informed consent was obtained from every participating patient, and patients were completely anonymized by researchers. All authors ensure that submissions are HIPAA-compliant. Researchers followed every mandatory (health and safety) procedures.

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Whyte, J., Cisneros, A.I., Fraile, J.J. et al. Interaction effect of tegmen tympani and superior semicircular canal statuses on the thickness of the roof of the glenoid fossa: a cross-sectional descriptive study. Surg Radiol Anat 42, 75–80 (2020). https://doi.org/10.1007/s00276-019-02358-w

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  • DOI: https://doi.org/10.1007/s00276-019-02358-w

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