Introduction: Orthodontic procedures involving dental extractions cause nasolabial angle change after retraction of the anterior segment in patients with Angle Class II malocclusion division 1 in skeletal class II patients. Aim: To evaluate the nasolabial angle changes in orthodontically treated skeletal class II patients from the Indian population with premolar extraction, using Facad ortho tracing software. Materials and methods: This was a retrospective study involving 60 patients, divided into two groups: group A – pre-treatment and group B – post-treatment, whose lateral cephalogram records were analyzed using Facad ortho tracing software. We bisected the nasolabial angle by putting a point in the subnasale, nose’s midpoint, and a tangent line from the upper lip to the subnasale. Statistical analysis was performed for comparing the pre- and post-treatment groups, and the paired t test was used to find out statistical significance – p value below 0.05. Results and discussion: According to the nasolabial angle shift with pre-treatment, the paired t test shows statistically insignificant (p>0.05) results for post-treatment records, with a mean of 1.67 and 1.80 for pre- and post-treatment, respectively. Conclusions: 50% of the class II malocclusion patients were found to have acute nasolabial angle before treatment, 30% of them resulting from acute to average nasolabial angle after completion of orthodontic treatment due to incisor retraction, which indicates a satisfactory improvement in the facial profile after the treatment.
Keywords:- facad ortho tracing software
- incisor retraction
- skeletal class II malocclusion