A new approach determining the sagittal interjaw relationship: the bisecting plane analysis.
BACKGROUND
Assessment of the sagittal interjaw relationship has for long time been dependent upon the relative positions, either to reference lines outside the jaw itself or, in some cases, the position was dentally determined. The present study developed a line bisecting the upper and lower jaws for a better approach to the assessment of orthopedic sagittal interjaw relationships.


METHODS
One hundred and ten randomly selected samples were used to make a comparison between bisecting plane (BSP) and functional occlusal plane (FOP) in terms of their accuracy in determining sagittal interjaw relationships. The "gold standard" for comparison was obtained through clinical comprehensive classification (CCC).


RESULTS
The BSP method was found to provide a better assessment of the sagittal interjaw relationship than the FOP method. Tests of chance-expected correction proportions were taken for both methods with CCC. A higher kappa value for the BSP method (0.659) was obtained than for the FOP (0.477).


CONCLUSIONS
Bisecting (BS) plane is an alternative reference plane for judging a skeletal sagittal interjaw relationship. The compliance with the clinical evaluation makes it a possible option when the orthopedic interjaw relationship needs to be critically determined for jaw rotation cases.
Hsu
B S
BS
Faculty of Dentistry, National Yang-Ming University, Taipei, Taiwan, R.O.C.
Cangialosi
T J
TJ
D000293:Adolescent; D000328:Adult; D002508:Cephalometry / Q000379:methods*; D002648:Child; D003766:Dental Occlusion; D005260:Female; D006801:Humans; D007574:Jaw Relation Record; D008297:Male; D008334:Mandible / Q000033:anatomy & histology*; D008437:Maxilla / Q000033:anatomy & histology*