Steiner proposed the appraisal of various parts of the skull separately Skeletal Dental Soft tissue
Skeletal Entails relating the upper and the lower jaw to the skull and to each other
Dental Entails relating the upper and lower incisor teeth to their respective jaw and to each other
Soft tissues Provide the means of assessing the balance and harmony of lower facial profile
Skeletal Analysis Used anterior cranial base (sella-nasion) as a reference line The advantage is the two midline points moved minimal amount when the head deviate from the true profile position
maxilla Point A is not an ideal reference point SNA noted to determine maxilla is positioned anteriorly or posteriorly to the cranial base
Mandible To determine is whether mandible is protrusive or recessive related to cranial base the SNB angle is noted.
Relationship of Maxilla andMandible According to steiner his major concern is the ANB angle ANB angle provide a general idea of the anteroposterior discrepancy of the maxillary to the mandibular apical bases
Occlusal Plane Drawn through the region of the overlapping cusps of the first premolars and first molars.
Mandibular Plane The mandibular plane is drawn between gonion (GO) and gnathion (Gn). Relating to anterior cranial base.
Maxillary Incisor position Axial inclinationis related to to N-A line
Mandibular Incisor Position Axial inclinationis related to to N-B line
Interincisal Angle Relates the relative position of the upper incisor to that the lower incisor.
Lower Incisor to chin
Soft-Tissue Analysis Is a graphic record of visual observation of clinical examination of patients S-line reference lips should touch a line extending from the soft tissue contour of the chin to the middle of the lower boarder of the nose
Acceptable Compromises Cephalometry must not be regarded as a numbers game in which the measured parameters of the tracing must approximate those of normal occlusion or the dentofacial skeletal pattern