Measurement of retromolar space dimensions using dental pantomograms for intubation feasibility

Background The purpose of this study was to measure the dimensions of the retromolar space of a patient population. If the dimensions were found to exceed the outside diameters of commonly used tracheal tubes, the results could increase use of the retromolar approach for oral intubation in patients with trismus. Methods We reviewed 311 dental pantomograms. Retromolar space height was measured from the lowest point of the maxillary tuberosity to the mandibular alveolar ridge. Width was measured from the last mandibular molar to the junction of the anterior border of the ramus with the body of the mandible. Results Mean height and width were 17.87 mm and 17.48 mm for the right space and 18.07 mm and 16.51 mm for the left. Conclusion These dimensions were usually larger than the outside diameters of commonly used tracheal tubes. The retromolar approach can be considered an option for flexible fiberoptic intubation in patients with trismus.