The Influence of the Upper Incisor Position on Soft Tissue Facial Profile

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Abstract
Facial proportions are important from an aesthetic point of view in that to be harmonious the upper, middle and lower face need to be of approximately equal size. The object of this study is to determine changes in hard and soft tissue profile which occur in patients having a Class II, Division 1 type incisor relationship as a result of overjet reduction. Thirty-three patients were studied cephalometrically there being an average overjet of 6·99 mm at commencement of treatment which reduced to an average of 3·5 mm on final analysis. Clinical appraisal suggests that there was an improvement of facial appearance following treatment. Cephalometric analysis shows that subnasale, labrale superius and labrale inferius moved nearer to the facial Plane as a result of re-modelling of the hard tissues resulting from orthodontic treatment. The female patients showed a relationship between retraction of the upper incisors and reduction in prominence of the lower lip and in those having a Class I dental base relationship, prominence of the upper lip. The male patients showed no correlation between upper incisor position and lip position. Continuing mandibular growth in the male could have a bearing on these findings.

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