Original Article
Correlation between tongue and mandibular morphology in skeletal Class Ⅱ adolescents of different vertical skeletal patterns
Wang Ziyi, Zhong Xintong, Su Mengmeng, Yuan Yijiao, Ye Jiameng, Zhao Yanhong
Published 2022-06-20
Cite as Chin J Orthod, 2022, 29(2): 70-74. DOI: 10.3760/cma.j.cn115797-20211025-22203
Abstract
ObjectiveTo explore the relationship between the shape and position of the tongue and the shape of the mandible in adolescents with skeletal Class Ⅱ different vertical skeletal facial types.
MethodsSixty cases of skeletal Class Ⅱ adolescents were selected, and they were divided into three groups according to the mandibular plane angle: 17 cases with high angle, 22 cases with average angle, and 21 cases with low angle. Cone beam CT was taken, The tongue and mandibular indexes were reconstructed and measured by using Invivo 5 software, and the characteristics of the tongue and mandible among the three groups were compared by one-way ANOVA analysis of variance, and the correlation between tongue and mandibular morphology was analyzed by Pearson correlation coefficient.
ResultsThe tongue height, tongue area, total area and the D2-D5 distance of the high-angle group are greater than those of the low-angle[(37.06±3.35) mm vs (33.26±3.27) mm, (2002.63±300.84) mm2 vs (1739.88±248.38) mm2, (2599.39±355.73) mm2 vs (2273.65±208.23) mm2, (24.99±3.17)mm vs (21.94±3.82)mm, (22.77±3.82) mm vs (18.87±4.19) mm, (21.42±4.25)mm vs (16.92±3.71) mm, (20.69±3.97)mm vs (16.42±3.41) mm; P<0.05]; the mandible length is less than that of the average-angle and the low-angle group[(63.24±3.92) mm, (67.43±4.95) mm and (67.18±4.21) mm, relatively; P<0.05]. The length and the width of the mandible is positively correlated with the tongue volume, the position of the tip and the back of the tongue. The concaveness of the fossa mentalis is positively correlated with the total area, the volume, and the position of the tip and the back of the tongue. The mandibular angle is positively correlated with tongue length, tongue height, tongue body area, tongue base area and D1-D4 distance.
ConclusionsCompared with low angle, skeletal Class Ⅱ adolescents with a high angle have a shorter mandible and a higher tongue position. Patients with longer and wider mandible and a more pronounced bony chin tend to have larger and lower tongue.
Key words:
Tongue; Skeletal Class Ⅱ malocclusion; Mandible; Cone beam CT
Contributor Information
Wang Ziyi
Department of Orthodontics, Stomatological Hospital, Tianjin Medical University 300070, China
Zhong Xintong
Department of Orthodontics, Stomatological Hospital, Tianjin Medical University 300070, China
Su Mengmeng
Department of Orthodontics, Stomatological Hospital, Tianjin Medical University 300070, China
Yuan Yijiao
Department of Orthodontics, Stomatological Hospital, Tianjin Medical University 300070, China
Ye Jiameng
Department of Orthodontics, Stomatological Hospital, Tianjin Medical University 300070, China
Zhao Yanhong
Department of Orthodontics, Stomatological Hospital, Tianjin Medical University 300070, China
是常见的一类错
畸形，多数表现为下颌骨发育不足，而非上颌骨发育过度。舌通过舌肌等结构与下颌骨特异性连接，二者各自独立但互相影响[1]。随着锥形束CT(cone-beam computed-tomography，CBCT)被广泛用于研究舌及下颌骨结构，既往学者发现与骨性Ⅰ类和Ⅲ类人群相比，成人骨性Ⅱ类有着较小的舌体，较低的舌位[2]和较短的下颌骨长度[3]，但骨性Ⅱ类不同垂直骨面型中二者之间的相关关系尚未见明确的报道。且目前研究对象多为成人，有关青少年的研究不足。因此，本研究选择骨性Ⅱ类青少年为样本，利用锥形束CT三维重建技术分析不同垂直骨面型中舌与下颌骨的特征，并探究二者的相关性，丰富舌与下颌骨形态关系的理论，为临床制订重视软组织的正畸诊疗提供参考。
