Variation of the sella-nasion plane and its effect on SNA and SNB.
The sella-nasion plane is one of the basic planes used in the cephalometric evaluation of candidates for orthognathic surgery. The relationship between SN and the Frankfort horizontal plane was studied. It was shown that as the angle between FH and SN increases, the SNA and SNB angles decrease in the normal individual. Compensation can be made for this variation by using the values presented.
D002508:Cephalometry; D002648:Child; D002680:Chin / Q000033:anatomy & histology; D006801:Humans; D008437:Maxilla / Q000033:anatomy & histology; D009666:Nose / Q000033:anatomy & histology*; D012658:Sella Turcica / Q000033:anatomy & histology*; D012886:Skull / Q000033:anatomy & histology