| ABSTRACTBackground: The aim of this study was to evaluate and analyze the effect and behavior of the upper and lower lipsin class I Iraqi subjects.Material and methods: True lateral cephalometric radiograph of the sample that comprises 60 females and 50 malesaged18-25 years and they possess class I skeletally and dentally. All the data have been analyzed by mean ofAutoCAD computer programs where 9 cephalometric angles have been analyzed.Results: In males the mean value of lower lip inclination, the upper lip inclination, and interlabial angle have nosignificant difference with that in females, so the mean values are 81.03, 84.2, and 158 respectively. The lower lip iscorrelated with F. man., upper lip inclination, interlabial angle, interincisal angle, upper and lower incisor inclination.The upper lip inclination is correlated with SGn. FH., F. man., interlabial angle, interincisal angle and lower lipinclination. Interlabial angle is correlated with upper lip inclination, interincisal angle, lower lip inclination, and uppercentral incisor inclination.Kewords: upper and lower lip inclination, interlabial angle, soft tissue cephalometric. (J Bagh Coll Dentistry2011;23(3): 156-159). |