A study on the correlationship of submentovertex view and lateral cephalogram measurements / 대한치과교정학회지

ABSTRACT

Cephalometric measureements have disadvantage of representing cranio-facial structures in two dimension only and therefore they pose limitations in describing three-dimentional structures of cranio-facial region. More interests have been put on the correlation between the two planes. This study evaluated correlations between facial type score, which allows effects on malocclusion, growth change prediction and establishment of treatment method and prognosis, and measurements from submentovertex view. Cephalometric view and submentovertex view were taken of skeletal Class I adults with optimal profile and correlations between them have been observed. Following results were obtained 1. To learn about factors that influence average condylar angulation, FACE, INT-CO-ANG, MN-CORPUS, CON-RATIO, GON-RATIO, MN-RATIO were used as variables and underwent multiple regression analysis. As a result, the following equation was obtained CON-AVE=.l73(FACE)-.322(INT-CO-ANG)+36.34(GON-RATIO) +.420(MN-CORPUS) (R2=.85451) 2. The following equation was obtained concerning facial type score. FACE= .050(CON-ANG)+.023(INT-CO-ANG)-.075(MN-CORPUS)(R2=.31547) 3. Among the submentovertex measurements, MN-CORPUS, CON-RATIO, GON-RATIO, MN-RATIO showed close correlations. (P<0.05) 4. Average condylar angualtions were 23.37degrees on the right and 20.71degrees on left. There was a difference between the two. FACE facial type soore. CON-ANG mean value of condylar angulation. CON-AVE mean value of Rt. Lt condylar angulation. INT-CO-ANG angle between Rt. Lt condylar axis. MN-CORPUS angle formed between RT. Lt gonion & pogonion. CON-RATIO lntercondylar distance/mandibular body length. GON-RATIO intergonion distanoe/mandibular body length. MN-RATIO lntermylohyoid distance/mandibular body length. MX-RATIO intermaxillary tuberosity distance/ANS-PNS distance.