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.