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,
Lin Bih-jaw Lin Bih-jaw Lin Bih-jaw () is a Taiwanese politician who served as the Secretary-General to the President from May to October 2016. Lin obtained his bachelor's degree in diplomacy from National Chengchi University in 1970, master's degree in politics from University of Manchester in the United Kingdom (UK) in 1974 and doctoral degree in international politics from University of Wales in the UK in 1981. He later became the vice president of National Chengchi University. Lin was appointed Secretary-General to the President in April 2016, and served under Tsai Ing-wen until 20 October 2016, a day after he had tendered