在下颌第三磨牙手术中用来避免舌神经损伤的方法是有争论的。曾经使用 Howarth氏骨膜分离器牵开舌侧组织瓣来保护舌神经 ,或用牙挺置于牙槽壁与舌侧组织之间的骨膜下以保护神经免受直接损伤。然而 ,一些专家认为保护舌神经的装置是不必要的。Howarth氏骨膜分离器由于位置不稳固 The method used to prevent the damage of the lingual nerve in the third mandibular third molar surgery is controversial. The Howarth's periosteum separator has been used to retract the lingual tissue flap to protect the lingual nerve or placed under the periosteum between the alveolar wall and the lingual tissue with teeth to protect the nerve from direct damage. However, some experts believe that the device to protect the lingual nerve is unnecessary. Howarth's periosteal separator is unstable because of its location