COMPARISON OF INCISORS INCLINATION IN HYPERDIVERGENT AND HYPODIVERGENT PATIENTS
Aim of the present study was to compare the maxillary and mandibular incisor inclination in hyperdivergent and hypodivergent patients. This cross-sectional comparative study was carried out in department of Orthodontics, Margalla Institute of Health Sciences (MIHS) Rawalpindi from November 2017 to April 2018.
The study included pre-treatment lateral cephalograms of 80 patients (40 hyperdivergent, 40 hypodivergent) having skeletal class I with CVM stage 5 or 6. Mean age of the sample (56 females, 24 males) was 20 3.8 years. Facial divergence was determined by mandibular plane angle (SN-MP). Hyperdivergent patients had SN-MP > 36?, whereas hypodivergent patients had SN-MP < 28?. Maxillary incisor inclination was determined by UI-PP angle and mandibular incisor inclination was determined by IMPA.
In hyperdivergent group, mean inclination of maxillary incisor was 118.58? 7.19? whereas in hypodivergent group, it was 113.60? 5.03?. Mean inclination of mandibular incisor in hyperdivergent and hypodivergent groups was 98.38? 8.58? and 90.83? 6.11? respectively. Statistically significant difference was present in both maxillary incisor inclination (P=0.008) and mandibular incisor inclination (P=0.002) between hyperdivergent and hypodivergent groups.
It was concluded that vertical facial pattern has a significant impact on incisors inclination. Both maxillary and mandibular incisor inclination were greater in hyperdivergent patients as compared to hypodivergent patients.