Great variation has been found in sagittal condylar inclination (SCI) values among individuals with different skeletal structures. Therefore, average value articulators cannot fully represent the physiological characteristics of the mandible, or reproduce its sagittal movements. The purpose of this study was to measure the SCI value of skeletal Class II patients by two different three-dimensional assessments, and to evaluate the correlation and consistency between the two methods. A total of 23 patients (aged 15–65 years) diagnosed with skeletal Class II malocclusion were recruited from the Stomatological Center of Shunde Hospital, Southern Medical University. Subjects were divided into three groups based on different A point–nasion–B point angle (ANB), and angle between the upper central incisor and Frankfort horizontal plane (U1-FH). Bilateral SCI values were measured using computer-aided diagnosis axiography (CADIAX) and cone-beam computed tomography (CBCT). Statistical analysis showed that the SCI value measured by CADIAX was significantly higher than that measured by CBCT. Significant differences were found among different ANB and U1-FH groups, and the average value of the 6∘<ANB≤8∘ group was the highest. Our findings indicate that the measurement of SCI by CADIAX cannot be replaced by CBCT, and it is recommended that personalized measurements of SCI values in skeletal class II patients be carried out. Individual SCI measurement can help coordinate the physiological characteristics of patients in dental treatment, benefit the health of temporomandibular joint and improve the long-term outcome. Our results suggest that the SCI values obtained by CBCT is different from the real SCI values of patients, and we will look for a simpler and more accurate clinical method to measure SCI value in future research.

中文翻译：

---

基于计算机辅助诊断轴测图和锥形束计算机断层扫描的骨骼Ⅱ类患者矢状髁倾角的三维评估

在具有不同骨骼结构的个体中，矢状髁倾角 (SCI) 值存在很大差异。因此，平均值咬合架不能完全代表下颌骨的生理特征，或再现其矢状面运动。本研究的目的是通过两种不同的三维评估测量骨骼II类患者的SCI值，并评估两种方法之间的相关性和一致性。南方医科大学顺德医院口腔科共招募了23名被诊断为骨骼II类错牙合的患者（年龄15-65岁）。根据不同的A点-鼻根-B点角度（ANB）以及上中切牙与法兰克福水平面（U1-FH）之间的角度将受试者分为三组。使用计算机辅助诊断轴测成像 (CADIAX) 和锥形束计算机断层扫描 (CBCT) 测量双侧 SCI 值。统计分析表明，CADIAX测得的SCI值明显高于CBCT测得的SCI值。不同 ANB 和 U1-FH 组之间存在显着差异，平均6∘<ANB≤8∘组是最高的。我们的研究结果表明，CADIAX 对 SCI 的测量不能被 CBCT 替代，建议对骨骼 II 类患者的 SCI 值进行个性化测量。个体化 SCI 测量有助于协调患者在牙科治疗中的生理特征，有利于颞下颌关节的健康，改善远期疗效。我们的研究结果表明，CBCT得到的SCI值与患者真实的SCI值存在差异，我们将在未来的研究中寻找更简单、更准确的临床方法来测量SCI值。