Tsugio Inokuchi

The Incidence of Neurosensory Disturbance after Sagittal Split RamusOsteotomy Depending on the Path of the Inferior Alveolar NeurovascularBundle

Both sagittal split ramus osteotomy (SSRO) and intraoral vertical ramus osteotomy (IVRO) are common surgical treatments for the mandible in patients with jaw deformities. Although SSRO has a wider indication than IVRO, SSRO has several disadvantages, including neurosensory disturbance (NSD) of the inferior alveolar nerve (IAN) [1,2]. While the incidence of NSD of the IAN after IVRO is 0 to 35% [1,3], that after SSRO is 9 to 85% [1,3,4]. In addition, several reports showed that the incidence of NSD of IAN was 99 to 100% immediately after SSRO [3,5,6], and 1 to 66% of the disturbances persisted permanently [5,7]. This permanent NSD not only irritates patients but also decreases patients’ quality of life (QOL) [8].

A case of oromandibular-digital hypogenesis syndrome

The oromandibular-digital hypogenesis syndrome is characterized by failure of development of the intraoral region and the distal extremities. A 12 year old female with an anomaly of the lingual fraenum, hypodontia of the lower incisors and defective fingers and toes was referred to our clinic. The aetiology of the disorder is still obscure. The author has reviewed the literature and discusses the morphological variation of the lingual fraenum.