Gurrncy 于1947年首次论述采用口外切口矫正嚼肌肥大的手术方法。虽然,口外切口可以获得良好的手术途径,达嚼肌及下颌骨角部,但存在着明显的不足,即产生术后疤痕,并可能损伤面神经颊支、下颌缘支和腮腺导管。由此,作者采用口内切口方法矫正嚼肌肥大,取得了良好效果。方法沿下颌骨升支前缘向前下方切开,止于下颌第二磨牙前庭沟处,深及骨膜,把嚼肌连同内侧的骨膜完全从下颌骨升支外侧板上分离下来,解剖出嚼肌的前缘,取1只锐利的骨膜分离器插入嚼肌内外层之间,形成一个裂隙,向下达下颌下缘及下颌角部,向上抵颧弓平面,使嚼肌的内外层完全分离。取一把长而有力的动脉钳,尽量于下颌下缘、下颌角处,把内层嚼肌下端夹 Gurrncy in 1947 for the first time discusses the use of oral incision to correct the method of chewing muscle hypertrophy surgery. Although an extraoral incision provides good surgical access to the chewing muscles and the corners of the mandible, there are obvious deficiencies in creating postoperative scars that can damage facial buccal branches, mandibular marginal branches and parotid ducts. As a result, the author adopted the method of mouth incision to correct chewing muscle hypertrophy, and achieved good results. Methods The mandibular ascending anterior margin was dissected forward and downward, and was stopped at the vestibular groove of mandibular second molars, deep and periosteum. The chewing muscles and periosteum were separated completely from the lateral plate of mandibular ascending branch. The leading edge of the muscle, take a sharp periosteal separator inserted between the inner and outer layers of the chewing muscle to form a fracture, down to the mandibular lower edge and mandibular angle, up to the zygomatic arch plane, so that the inner and outer chewing muscles completely separated. Take a long and powerful arterial forceps, as far as the lower edge of the mandible, mandibular angle at the lower end of the medial layer of chewing muscles