Department of Orthodontics and Dentofacial Orthopaedics, Noorul Islam College of Dental Sciences, NIMS Medicity, Thiruvananthapuram, Kerala, India, Phone: +91 7406620420, +91 9400674565, e-mail:
Department of Orthodontics and Dentofacial Orthopaedics, College of Dental Science, Davangere, Karnataka, India.
J Contemp Dent Pract. 2023 Apr 1;24(4):244-249. doi: 10.5005/jp-journals-10024-3503.
The aim of the study was to assess the influence of cranial base length (CBL) and Flexure on facial parameters in Hypodivergent, Normodivergent, and Hyperdivergent patients.
Around 60 standardized cephalograms were divided into Hypodivergent, Normodivergent, and Hyperdivergent groups (20 each) based on the FMA angle. The CBL, cranial flexure (CF), and various facial parameters were measured for each case. The results were analyzed for the correlation between Cranial and facial parameters in each of the three study groups.
Comparison and Pairwise Comparison of variables between study groups were done using ANOVA and Tukey's Test. Cranial base length, mandibular body length, LAFH, N-Me-Go angle ( <0.001), and Jarabak's ratio were found to be significantly different between the groups. Pearson's Correlation showed that most of the facial parameters had a significant correlation with CBL in Hypodivergent groups.
The CBL is more closely related to facial parameters in vertical dysplasia individuals than CF. The CBL is positively correlated to facial variables, especially in Hypodivergent individuals. The N-Me-Go Angle introduced in the study was significantly different in all three vertical facial types studied; hence, it cannot be used as a valuable diagnostic tool.
Changes in the length and flexure of the cranial base influence the anteroposterior position of jaw bases. The influence of the cranial base on the development of vertical dysplasias is not studied much, hence the present study aims at resolving this lacuna in literature.
本研究旨在评估颅底长度（CBL）和弯曲度（Flexure）对低角、均角和高角患者面部参数的影响。
根据 FMA 角，将大约 60 张标准化头颅侧位片分为低角、均角和高角组（每组 20 张）。测量每个病例的 CBL、颅弯曲度（CF）和各种面部参数。分析三组研究中颅面参数之间的相关性。
使用方差分析和 Tukey 检验对研究组之间的变量进行比较和两两比较。颅底长度、下颌体长、LAFH、N-Me-Go 角（<0.001）和 Jarabak 比值在组间存在显著差异。Pearson 相关性分析表明，在低角组中，大多数面部参数与 CBL 有显著相关性。
与 CF 相比，CBL 与垂直发育不良个体的面部参数更密切相关。CBL 与面部变量呈正相关，尤其是在低角个体中。本研究中引入的 N-Me-Go 角在三种垂直面型中均有显著差异，因此不能作为有价值的诊断工具。
颅底长度和弯曲度的变化会影响颌骨基骨的前后位置。颅底对垂直发育不良的影响尚未得到充分研究，因此本研究旨在填补该文献空白。
