Jaw abnormality sagittally divides the face into five equal parts: It is insufficient to derive at a diagnosis of jaw deformity solely based on the clinical examination. Hence, additional information is gathered from diagnostic tests, which may include dental model analyses and radiographic imaging studies. Mandibular micrognathia is the condition when lower jaw is smaller than normal. Failure of the ramus to develop will give rise to micrognathia.<ref name="Elsevier/Churchill Livingstone"></ref> Micrognathia can be classified as either congenital or acquired. Clinical appearance of some patients with congenital type of mandibular micrognathia can have a severe retrusion of the chin but by actual measurements,
Jaw Shaw-kong party's refusal to support him, Jaw won a record number of votes. He later became a member of the New Kuomintang Alliance and the Breakfast Club, set up in opposition to party chairman Lee Teng-hui. In August 1993, he co-founded the New Party. The next year, Jaw contested the Taipei City mayoralty, and lost to Chen Shui-bian. Jaw announced his intention to retire from politics in July 1996. He was named an adviser to Kuomintang candidates during the 2010 election cycle. In 2017, Jaw stated that he was an independent. Soon after ending his political career, Jaw founded UFO Radio.