Upper Lip Strain in Bimaxillary Proclination

The purpose of this study was to determine the upper lip by Holdaway’s method in individuals with bimaxillary proclination and to find out correlations of skeletal convexity at point A & maxillary incisor inclination with upper lip inclination and upper lip strain. Lateral cephalograms of 100 patients (50 males and 50 females) exhibiting bimaxillary dental proclination were exposed in closed lip position. Cephalometric radiographs were traced manually and the database was developed in SPSS 10.0 for windows. The results showed a significant positive correlation with upper lip strain measured by Holdaway’s method. Holdaway’s method reveals lip strain in the sample. No statistical significant correlations of skeletal convexity at point A and maxillary incisor inclination with upper lip inclination were found. A-FP distance revealed a significant negative correlation with upper lip strain recorded by Holdaway’s method. I-FH and I-SN plane angles are significantly positively correlated with upper lip inclination and upper lip strain measured by Holdaway’s method.