Cephalometric Angles
According to the Steiner's analysis: ANB (A point, Nasion, B point)- indicates whether the skeletal relationship between the maxilla and mandible is a normal (skeletal class I relationship (+ 2 degrees), a skeletal Class II (+4 degrees or more), or skeletal class III (0 or negative). SNA (sella, Nasion, A point)- indicates whether or not the maxilla is normal, prognathic, or retrognathic. SNB (sella, Nasion, B point)- indicates whether or not the mandible is normal, prognathic, or retrognathic. SNA and SNB is important to determine what type of intervention (on maxilla, mandible or both) is appropriate. These angles, however are influenced also by the vertical height of the face and a possible abnormal positioning of Nasion.
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