Evaluation of upper lip hypoesthesia with a trigeminal somatosensory-evoked potential following Le Fort I osteotomy in combination with mandibular osteotomy

Abstract

Purpose: The purpose of this study was to objectively evaluate hypoesthesia of the 1 upper lip following Le Fort I osteotomy in combination with mandibular osteotomy with trigeminal somatosensory-evoked potential (TSEP). Subjects and Methods

Assessment of bone healing and hypoesthesia in the upper lip after Le Fort I osteotomy with self-setting α-tricalcium phosphate and absorbable plates

“…Various fixation techniques have been used for maxillary stabilization including trans-osseous and suspension wires, intraoral skeletal fixation appliances, and bone plating (Ueki et al, 2007;Marşan et al, 2009;Mavili et al, 2009;Kretschmer et al, 2010). Post-operatively, the maxilla appears to be healed and in a stable position on clinical assessment.…”

“…The presence of remnant Biopex® after 1 year also suggested that the resorption of the TSEP, a somatosensory evoked potential of the peripheral nerves has been used previously to investigate the causal factors of trigeminal sensory hypoesthesia that occurs after SSRO (Nakagawa et al, 1997;Nakagawa et al, 2001;Nakagawa et al, 2003;Hashiba et al, 2007;Hashiba et al, 2008). This method is highly objective and reliable as the potential changes of cerebral origin can be detected on the scalp in human subjects following electrical stimulation of the peripheral nerves.…”

“…When alternative materials are used at the area between the maxillary segments, it is unclear whether use of such material can affect the recovery period of upper lip hypoesthesia (Ueki et al, 2007;Ueki et al, 2008).…”

“…One year postoperatively a partial to total recovery of sensation of the affected area has been reported (Nelson et al, 1977;de Jongh et al, 1986;Kahnberg and Emgströn, 1987). The previous study objectively showed that hypoesthesia occurs in the upper lip following Le Fort I osteotomy with (trigeminal somatosensory-evoked potential) TSEP (Ueki et al, 2007). When the alternative materials are used at the area between the maxillary segments, it is unclear whether the recovery period of the upper lip hypoesthesia can be delayed.…”

Trigeminal somatosensory evoked potential test as an evaluation tool for infraorbital nerve damage

“…N1 represents the start of an evoked potential (check point of latency) and indicates axonal conduction. P1 represents the check point of amplitude at post central gyrus of parietal lobe and is the most reproducible measurement in this test [7,8]. N2 is the end point of an evoked potential.…”