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An analysis of the correlativity between seven cephalometric indexes of SN. FH and OP systems indicates that none of the systems possesses the index which can rule out the effects of other factors to evaluate objectively the sagittal relation between the jaws. In these three systems, owing to more factors affecting indexes of SN system, we suggest to use AXB or A-B/ /FH and Wit’s appraisal in comprehensive analysis of the sagittal relation of the jaws, instead of the indexes of SN system. Using indexes of FH or OP system alone in evaluation of not advocated.
An analysis of the correlativity between seven cephalometric indexes of SN. FH and OP systems indicates that none of the systems possesses the index which can rule out the effects of other factors to evaluate objectively the sagittal relation between the jaws. In these three systems, to more factors affecting indexes of SN system, we suggest to use AXB or AB / / FH and Wit’s appraisal in comprehensive analysis of the sagittal relation of the jaws, instead of the indexes of SN system. Using indexes of FH or OP system alone in evaluation of not advocated.