Cranial-base morphology in adults with skeletal Class III malocclusion
Cranial-base morphology in adults with skeletal Class III malocclusion
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DOI：
10.1016/j.ajodo.2014.04.014
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发表时间：
2014-07-01
影响因子：
3
通讯作者：
Nakamura, Yoshiki
中科院分区：
文献类型：
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作者：
Sanggarnjanavanich, Seetala;Sekiya, Toshiko;Nakamura, Yoshiki
简介：本研究的目的是阐明成人骨性III类错牙合的颅底形态特征，并探讨与骨性III类错牙合建立相关的因素。方法：对女性患者进行头颅侧位片检查。ANB角为0度至4度、正常覆盖和覆牙合、I类磨牙关系的受试者被归类为I类（n = 86）。ANB角小于-1度、Wits评估小于2 mm、负覆盖和III类磨牙关系的患者在本研究中为III类组（n = 86）。进行了角度、线性和坐标测量。采用多元方差分析和Student t检验分析两组间的显著性差异。判别分析，逻辑回归分析，决策分析，以确定颅底和上下颌变量影响建立骨性III类错？结果：III类组的NSBa、SeSBa、FH-SSe和FH-SBa值较小。蝶突和颅底比I类组更靠下和靠前。两组之间的前后颅底长度没有差异。较大的下颌骨长度是III类组的第一个主要特征，其次是较小的SeSBa和NSBa值。结论：成人骨性III类错牙合的颅底形态不同于骨性I类错牙合。较小的颅底角、较陡的后颅底、更靠前的蝶骨位置和更靠前的颅底位置是骨性III类错牙合的主要特征。这些特征在骨性III类错牙合的建立中起着重要作用。
Introduction: The objectives of this study were to clarify the characteristics of cranial-base morphology in adults with skeletal Class III malocclusion and investigate factors relating to the establishment of a skeletal Class III malocclusion. Methods: Initial lateral cephalograms of women were examined. Subjects with an ANB angle of 0 degrees to 4 degrees, normal overjet and overbite, and a Class I molar relationship were classified as Class I (n = 86). Those with an ANB angle less than -1 degrees, a Wits appraisal less than 2 mm, a negative overjet, and a Class III molar relationship were the Class III group (n = 86) in this study. Angular, linear, and coordinate measurements were made. Multivariate analysis of variance and the Student t test were used to analyze significant differences between the 2 groups. Discriminant analysis, logistic regression analysis, and decision analysis were used to identify which cranial-base and maxillomandibular variables influenced the establishment of a skeletal Class III malocclusion. Results: The Class III group had smaller values for NSBa, SeSBa, FH-SSe, and FH-SBa. Sphenoidale and basion were more inferior and anterior than those of the Class I group. There was no difference in the anterior and posterior cranial-base lengths between the groups. Greater mandibular length was the first major characteristic in the Class III group, followed by smaller values for SeSBa and NSBa. Conclusions: Cranial-base morphology in adults with a skeletal Class III malocclusion is different from that in a skeletal Class I malocclusion. Smaller cranial-base angles, steeper posterior cranial bases, more inferiorly positioned sphenoidale, and more anteriorly positioned basion are major characteristics of skeletal Class III malocclusions. These characteristics play important roles in the establishment of a skeletal Class III malocclusion.