Guarnieri R, Cavallini C, Vernucci R, Vichi M, Leonardi R, Barbato E
"Sapienza" University of Rome, Via Caserta 6, 00161 Rome, Italy,
Med Oral Patol Oral Cir Bucal. 2016 Nov 1;21(6):e743-e750. doi: 10.4317/medoral.21337.
The prevalence of impacted maxillary canine is reported to be between 1% and 3%. The lack of monitoring and the delay in the treatment of the impacted canine can cause different complications such as: displacement of adjacent teeth, loss of vitality of neighbouring teeth, shortening of the dental arch, follicular cysts, canine ankylosis, recurrent infections, recurrent pain, internal resorption of the canine and the adjacent teeth, external resorption of the canine and the adjacent teeth, combination of these factors. An appropriate diagnosis, accurate predictive analysis and early intervention are likely to prevent such undesirable effects. The objective is to evaluate, by means of a retrospective observational study, the possibility of carrying out a predictive analysis of root resorption adjacent to the impacted canines by means of orthopantomographs, so as to limit the prescription of additional 3D radiography.
120 subjects with unilateral or bilateral maxillary impacted canine were examined and 50 patients with 69 impacted maxillary canine (22 male, 28 female; mean age: 11.7 years) satisfied the inclusion criteria of the study. These patients were subjected to a basic clinical and radiographic investigation (orthopantomographs and computerized tomography). All panoramic films were viewed under standardized conditions for the evaluation of two main variables: maxillary canine angulations (a, b, g angles) and the overlapping between the impacted teeth and the lateral incisor (Analysis of Lindauer). Binary logistic regression was used to estimate the likelihood of resorbed lateral incisors depending on sector location and angle measurements.
Results indicated that b angle has the greatest influence on the prediction of root resorption (predictive value of b angle = 76%). If β angle <18° and Lindauer = I, the probability of resorption is 0.06.
Evaluation of b angle and superimposition lateral incisor/impacted canine analysed on orthopantomographs could be one of the evaluation criteria for prescribing second level examination (CT and CTCB) and for detecting root resorption of impacted maxillary canine adjacent teeth.
据报道，上颌阻生尖牙的患病率在1%至3%之间。对阻生尖牙缺乏监测以及治疗延迟会导致不同的并发症，如：邻牙移位、邻牙活力丧失、牙弓缩短、滤泡囊肿、尖牙 ankylosis、反复感染、反复疼痛、尖牙及邻牙的内部吸收、尖牙及邻牙的外部吸收，以及这些因素的组合。适当的诊断、准确的预测分析和早期干预可能会预防此类不良影响。目的是通过一项回顾性观察研究，评估利用曲面断层片对阻生尖牙相邻牙根吸收进行预测分析的可能性，以限制额外的三维放射摄影的开具。
检查了120名单侧或双侧上颌阻生尖牙的受试者，50名患有69颗上颌阻生尖牙的患者（22名男性，28名女性；平均年龄：11.7岁）符合研究的纳入标准。这些患者接受了基本的临床和放射学检查（曲面断层片和计算机断层扫描）。所有全景片均在标准化条件下进行观察，以评估两个主要变量：上颌尖牙角度（a、b、g角）以及阻生牙与侧切牙之间的重叠情况（Lindauer分析）。采用二元逻辑回归来估计侧切牙吸收的可能性，该可能性取决于扇形位置和角度测量。
结果表明，b角对牙根吸收的预测影响最大（b角的预测值 = 76%）。如果β角<18°且Lindauer = I，则吸收的概率为0.06。
在曲面断层片上分析b角以及侧切牙/阻生尖牙的重叠情况，可能是开具二级检查（CT和CTCB）以及检测上颌阻生尖牙相邻牙根吸收的评估标准之一。
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