Jung Ji-Song, Lim Ho-Kyung, Lee You-Sun, Jung Seok-Ki
Department of Orthodontics, Graduate School of Clinical Dentistry, Korea University, Seoul 02841, Republic of Korea.
Department of Oral and Maxillofacial Surgery, Korea University Guro Hospital, Seoul 08308, Republic of Korea.
Diagnostics (Basel). 2024 Dec 6;14(23):2747. doi: 10.3390/diagnostics14232747.
To assess the incidence of and risk factors for black triangles between the central incisors after orthodontic treatment; Methods: Ninety-seven post-treatment patients (29 men and 68 women; mean age, 22.7 years) were retrospectively divided into two groups based on the presence or absence of black triangles, using intraoral photographs. Based on the Jemt Index, the black triangle occurrence group was further classified into mild, moderate, and severe groups. Parameters from periapical radio graphs, lateral cephalograms, and study models were compared between the occurrence and the non-occurrence groups by using independent -tests. Logistic regression analysis was performed to identify the risk factors for black triangles; Results: The incidence of black triangles between the central incisors was 51% and 64% in the maxilla and in the mandible, respectively. The factors significantly associated with the occurrence of black triangles were age, treatment duration, the lingual inclination of the maxillary incisors in the maxilla, and age in the mandible ( < 0.05); Conclusions: This study showed the diverse risk factors associated with black triangles between central incisors after orthodontic treatment and revealed that the formation of black triangles is relatively common. Considering these risk factors during orthodontic diagnosis and treatment planning can help minimize the occurrence of black triangles.
评估正畸治疗后中切牙间黑三角的发生率及危险因素；方法：回顾性选取97例正畸治疗后的患者（29例男性，68例女性；平均年龄22.7岁），根据口内照片中是否存在黑三角将其分为两组。根据耶姆特指数，黑三角出现组进一步分为轻度、中度和重度组。采用独立样本t检验比较根尖片、头颅侧位片和研究模型在黑三角出现组和未出现组之间的参数。进行Logistic回归分析以确定黑三角的危险因素；结果：上颌和下颌中切牙间黑三角的发生率分别为51%和64%。与黑三角发生显著相关的因素有年龄、治疗时间、上颌中切牙在上颌的舌倾度以及下颌的年龄（P<0.05）；结论：本研究显示了正畸治疗后中切牙间黑三角相关的多种危险因素，并表明黑三角的形成相对常见。在正畸诊断和治疗计划中考虑这些危险因素有助于减少黑三角的发生。
