切牙咬合影响中年成年人的面部轮廓形状变异。
Incisor Occlusion Affects Profile Shape Variation in Middle-Aged Adults.
作者信息
Kanavakis Georgios, Silvola Anna-Sofia, Halazonetis Demetrios, Lähdesmäki Raija, Pirttiniemi Pertti
机构信息
Department of Pediatric Oral Health and Orthodontics, UZB-University Center for Dental Medicine, University of Basel, Mattenstrasse 40, CH-4058 Basel, Switzerland.
Department of Orthodontics and Dentofacial Orthopedics, Tufts University School of Dental Medicine, Boston, MA 02111, USA.
出版信息
J Clin Med. 2021 Feb 17;10(4):800. doi: 10.3390/jcm10040800.
BACKGROUND
The aim of this study was to assess the effect of overjet and overbite on profile shape in middle-aged individuals.
METHODS
The study population comprised 1754 46-year-old individuals, members of the 1966 Northern Finland Birth Cohort. Their profile images were digitized using 48 landmarks and semi-landmarks. The subsequent landmark coordinates were then transformed to shape coordinates through Procrustes Superimposition, and final data were reduced into Principal Components (PCs) of shape. Overjet and overbite values were measured manually, during a clinical examination. A multivariate regression model was developed to evaluate the effect of overjet and overbite on profile shape.
RESULTS
The first nine PCs described more than 90% of profile shape variation in the sample and were used as the shape variables in all subsequent analyses. Overjet predicted 21.3% of profile shape in the entire sample (ηoverjet = 0.213; < 0.001), while the effect of overbite was weaker (ηoverbite = 0.138; < 0.001). In males, the equivalent effects were 22.6% for overjet and 14% for overbite, and in females, 25.5% and 13.5%, respectively.
CONCLUSION
Incisor occlusion has a noteworthy effect on profile shape in middle-aged adults. Its impact becomes more significant taking into consideration the large variety of genetic and environmental factors affecting soft tissue profile.
背景
本研究旨在评估中年人群中覆盖和覆合对侧貌形态的影响。
方法
研究人群包括1754名46岁个体，他们是1966年芬兰北部出生队列的成员。使用48个标志点和半标志点将他们的侧貌图像数字化。随后，通过普氏叠加将标志点坐标转换为形状坐标，并将最终数据简化为形状的主成分（PCs）。在临床检查期间手动测量覆盖和覆合值。建立多元回归模型以评估覆盖和覆合对侧貌形态的影响。
结果
前九个主成分描述了样本中超过90%的侧貌形态变化，并在所有后续分析中用作形状变量。覆盖预测了整个样本中21.3%的侧貌形态（η覆盖 = 0.213；< 0.001），而覆合的影响较弱（η覆合 = 0.138；< 0.001）。在男性中，覆盖和覆合的等效效应分别为22.6%和14%，在女性中分别为25.5%和13.5%。
结论
切牙咬合对中年成年人的侧貌形态有显著影响。考虑到影响软组织侧貌的多种遗传和环境因素，其影响变得更加显著。
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