Đánh giá chỉ số độ khó nhổ răng khôn hàm dưới có chỉ định mở xương theo pederson cải tiến tại viện Đào tạo Răng Hàm Mặt năm 2023-2024

Analysis of the difficulty in extracting lower wisdom teeth with bone exposure indicated at School of Dentistry, Hanoi Medical University in 2023-2024. Subjects and methods: Descriptive study based on case serie. Patients with impacted or partially or fully erupted lower wisdom teeth, indicated for extraction with bone exposure, were assessed through clinical examination and Cone Beam CT. Evaluation criteria included wisdom tooth position (angulation, degree of impaction, type), root morphology (number, shape), the angle between the second molar and the lower wisdom tooth, bone width distal to the second molar, mesiodistal dimensions of the lower wisdom tooth, extent of bone resorption (if present) on the distal aspect of the second molar, relation of the inferior alveolar nerve canal to the wisdom tooth roots, and the bone density around the lower wisdom tooth roots. Results: The average age of patients was 19.9. The highest proportion of lower wisdom teeth were in a near-vertical position, at 51.5%. The most common root morphology was the tapered two-root type, at 56.2%. The majority of wisdom teeth were classified as type A2 in depth, at 65.6%. The most common horizontal classification was type II, at 56.2%. Most lower wisdom tooth roots did not contact the inferior alveolar nerve canal, at 62.5%. Bone density was predominantly type DI, at 87.6%. Most lower wisdom teeth had a widened periapical radiolucency, at 59.4%. In terms of extraction difficulty, 71.9% were of moderate difficulty and 28.1% were very difficult. Conclusion: Lower wisdom teeth are classified as moderately difficult in 71.9% of cases, 28.1% are considered very difficult.