ĐẶC ĐIỂM LÂM SÀNG VÀ CẬN LÂM SÀNG BỆNH NHÂN MẤT RĂNG CỐI LỚN THỨ NHẤT HÀM DƯỚI CÓ CHỈ ĐỊNH PHỤC HỒI BẰNG PHƯƠNG PHÁP ĐẶT IMPLANT DƯỚI MÀO XƯƠNG

Abstract

Background: The mandibular first molar is often lost early due to its position as the first permanent tooth to erupt in the dental arch. Evaluating clinical and radiographic characteristics aids in prognosis and treatment planning for implant rehabilitation. Objective: To assess the clinical and radiographic features of patients with missing mandibular first molars indicated for subcrestal implant placement at the University of Medicine and Pharmacy Hospital, Can Tho. Materials and Methods: A cross-sectional descriptive study was conducted on 23 patients with a total of 28 single missing mandibular first molars indicated for subcrestal implant placement at the University of Medicine and Pharmacy Hospital, Can Tho, from March 2023 to March 2025. Results: The average age was 29.52 ± 11.02 (20–49 years old). The duration of tooth loss was <5 years, accounting for 63.64%. The proportion of women was 52.17%, and that of men was 47.83%. The main cause was tooth decay/pulp disease (86.36%), commonly occurring in the 18–39 year old group. Unilateral loss of tooth number 6 was predominant. The average thickness of the alveolar ridge cortical bone was 1.04 mm. The bone density of D3 was 46.43%, and D1 was the lowest (7.14%). The average bone length was 16.6 mm; the width was 6–9 mm, accounting for 78.57%. Conclusion: Loss of the mandibular first molar frequently occurs in young adults, primarily due to caries or endodontic pathology, with unilateral loss being predominant. D3 bone density was most prevalent, and the cortical bone was thin, with bone width favorable for subcrestal implant placement.