Lip Curve Changes in Patients with Premolar Extraction and Non-Extraction Treatment Nanda Smruti Bhusan1,*, Nayak Tusar Kanti2 1Professor & HOD, Dept. of Orthodontics. Institute of Dental Sciences, Siksha‘O’ Anusandhan. Bhubaneswar. Odisha. India 2Professor, Dept. of Orthodontics. Institute of Dental Sciences, Siksha‘O’ Anusandhan. Bhubaneswar. Odisha. India *Corresponding Author: Dr. Smruti Bhusan Nanda Professor & HOD, Dept. of Orthodontics, Institute of Dental Sciences, Siksha’O ’Anusandhan (Deemed to be University) Bhubaneswar-751030, Odisha, India
Online published on 2 February, 2019. Abstract Background & Objectives Most previous literature has given little consideration to the depth and regularity of the lip curves and their importance in the overall perception of the lateral facial profile. The present studies was undertaken to asses and compare the changes in lip curvature of upper and lower lips after the orthodontic treatment with or without bicuspid extraction in adult patients. Method A total of 26 subjects were included in this trial, which were divided into two main groups-extraction of upper 4 and lower 5 and non-extraction group. In order to access the soft tissue effects of treatment, the depths of upper and lower lip curves were measured on all pre and post treatment cephalograms, in relation to skeletally defined PM line as the principal reference line. Results The mean reduction in the depth of upper lip curvature in the 4/5 extraction group was 1.94 ± 1.84mm. In non-extraction group it was 0.33 ± 1.77mm The mean reduction of lower lip curve depth in the 4/5 extraction group was observed to be 1.66 ± 3.66mm. In the non-extraction group a mean increase of lower lip curve depth by 0.59 ± 2.97mm was observed. Interpretation & Conclusion The study concluded that lip curve depth changes in a particular direction are not entirely dependant on extraction or non extraction of bicuspids rather it is a resultant of a range of individual variable factors. Changes in the lower lip curve depth in response to orthodontic treatment, is comparatively more predictable than those in the upper lip. However, it should be interpreted with caution, given the small sample size. Top Keywords Premolar Extraction, non-extraction, lip curve changes, lateral cephalograms. Top |