Nghiên cứu đặc điểm lâm sàng và X - quang của bệnh nhân sai khớp cắn loại II tại khoa răng, Bệnh viện Quân y 103

Abstract

bjectives: To describe some clinical characteristics and study some craniofacial indices on Cephalometric radiographs and plaster models of Class II malocclusion patients.
Materials and Methods: A descriptive cross-sectional study was conducted on 69 patients with skeletal Class II at Dental department, 103 Military Hospital.
Results: 78.26% females and 21.74% males, and an average age of 24.5 (range 14-53). Extraoral clinical features showed 100% of patients had a convex facial profile, 78.3% had lip incompetence at rest, and 46.7% had bad habits. A tendency towards vertical growth pattern (decreased lower facial height in 43.2% of patients) was observed. The oval arch form was the most prevalent (70.3%). The mean pre-treatment PAR index was 34.45±10.95, with 69.6% classified as severe malocclusion (PAR>30). Skeletal characteristics included a mean ANB of 6.61±1.71°, SNA of 83.91±9.89°, and SNB of 78.37±3.62°. The mean GoGn-SN angle was 34.86±5.78°. Dental measurements indicated maxillary incisor proclination with U1-SN at 112.77±8.88°, and an interincisal angle (U1-L1) of 111.54±9.17°. Soft tissue analysis showed a nasolabial angle of 90.41±13.49°, and both upper and lower lips were protruded relative to the E-line (Ls-E 2.11±1.86mm, Li-E 4.18±2.15mm).
Conclusion: Patients with Class II malocclusion at the Dental Department, 103 Military Hospital exhibited complex clinical and radiographic characteristics, including a high rate of severe malocclusion, convex facial profiles, bimaxillary incisor proclination, and significant anteroposterior and vertical skeletal discrepancies.