Main objective of Tweed's analysis:
The main objective of Tweed's analysis includes the determination of the position of lower incisor and evaluation of the prognosis of a case. The angles in Tweed's analysis are FMIA, IMPA and FMPA.
Incisor mandibular plane angle (IMPA) is the angle between long axis of lower incisor with the mandibular plane. The mean value is 90°. It indicates the inclination of lower incisor.
Determination of the position of lower incisors and evaluation of prognosis of a case.
Profile of an individual
Relationship between maxillary central and mandibular central incisors
The position of maxilla and mandible to each other