Surgical Risk Factors and Maxillary Nerve Function After Le Fort I Osteotomy

Thygesen, Torben H.; Bardow, Allan; Norholt, Sven Erik; Jensen, John; Svensson, Peter

doi:10.1016/j.joms.2008.07.004

« Previous Next »Journal of Oral and Maxillofacial Surgery
Volume 67, Issue 3 , Pages 528-536, March 2009

Surgical Risk Factors and Maxillary Nerve Function After Le Fort I Osteotomy

Torben H. Thygesen, DDS, PhD
- Assistant Professor, Department of Oral and Maxillofacial Surgery, Aarhus University Hospital, and Department of Clinical Oral Physiology, School of Dentistry, University of Aarhus, Aarhus, Denmark
- Address correspondence and reprint requests to Dr Thygesen: Department of Oral and Maxillofacial Surgery, Odense University Hospital, Soender Boulevard 29, 5000 Odense C, Denmark
Allan Bardow, DDS, PhD
- Associate Professor, Department of Oral Medicine, School of Dentistry, University of Copenhagen, Copenhagen, Denmark
Sven Erik Norholt, DDS, PhD
- Associate Professor, Department of Oral and Maxillofacial Surgery, Aarhus University Hospital, Aarhus, Denmark
John Jensen, DDS, PhD
- Associate Professor, Department of Oral and Maxillofacial Surgery, Aarhus University Hospital, Denmark
Peter Svensson, DDS, PhD, Dr Odont
- Professor and Chairman, Department of Clinical Oral Physiology, School of Dentistry, University of Aarhus, Aarhus, Denmark

Purpose

Data on intraoperative risk factors for long-term postoperative complications after Le Fort I osteotomy (LFO) are limited. The aim of this study was to describe prospectively the overall postoperative changes in maxillary nerve function after LFO, and to correlate these changes with a number of possible intraoperative risk factors.

Patients and Methods

Twelve men and 13 women (mean ± standard deviation: aged 25 ± 10 years) participated in 4 sessions: 1 before LFO (baseline), and the rest at 3, 6, and 12 months after LFO. At each session, somatosensory sensitivity was assessed for the skin, oral mucosa, and teeth, using quantitative sensory tests at either 1 cutaneous point or on a 5 × 5 point matrix reproduced on the skin. In addition, all patients were asked to report their perceived differences in somatosensory sensitivity and their overall satisfaction with the LFO.

Results

The thresholds of tactile stimuli on the gingiva and palate were increased 12 months after LFO (P < .001). Significant increases in 2-point discrimination detection thresholds (P < .01) and increased sensitivity to heat (P < .01) and cold (P < .001) in the infraorbital region were also recorded 12 months after LFO. Correspondingly, self-reported complaints of changed sensation under the eyes (P < .01), upper lip (P < .01), gingiva (P < .001), palate (P < .01), and teeth (P < .01) were reported during the entire postoperative period. Intraoperative risk factors were identified and correlated with postoperative changes in somatosensory sensitivity. Segmentation of the maxilla was associated with an increase in tactile thresholds at the palate and gingiva (P < .05), as were self-reported complaints involving the palate and gingiva (P < .001), whereas maxillary impaction was related to lower-tooth pulp pain thresholds when compared with maxillary lowering (P < .01). All patients expressed satisfaction with LFO, despite signs of somatosensory disturbances in up to 64% of patients.

Conclusion

Numerous changes in postoperative somatosensory function are to be expected after LFO. In most patients, these changes are minor, and some are dependent on intraoperative procedures. Nonetheless, all patients reported satisfaction with the surgical results, and would recommend the procedure to others.