Diéguez-Pérez Montserrat, de Nova-García M Joaquín, Mourelle-Martínez Mª Rosa, González-Aranda Cristina
Departamento de Odontopediatría, Profilaxis y Ortodoncia. Facultad de Odontología Universidad Complutense de Madrid, Plaza Ramón y Cajal, 3 - Ciudad Universitaria, 28040 Madrid.
J Clin Exp Dent. 2017 Sep 1;9(9):e1115-e1120. doi: 10.4317/jced.54110. eCollection 2017 Sep.
All authors agree that posterior crossbite is a malocclusion that affects mandibular growth and may lead to skeletal asymmetry but there are few data on which age these modifications are easily quantifiable.
For this study, the researchers used x-ray records of 217 children between 6 and 9 years of age, in the mixed dentition stage and with unilateral posterior crossbite. All the horizontal variables were traced and evaluated by the principal researcher, using the tpsDig version 2 computer program. Subsequently, a descriptive and statistical analysis was carried out, using the SPSS 17.0 for Windows program.
After analysing the vertical mandibular traces on the x-rays, the researchers found, in all cases, quantifiable differences between the crossbite side and the non-crossbite side. The differences between horizontal variables were statistically significant (<0.005) for the entire sample (H3-H4), in the group of boys (H3-H4) and in the 7-year old age group (H1-H2 and H3-H4). Differences were observed in the size of the horizontal measures between the crossbite side and the non-crossbite side. Some of these differences were significant as a function of the sex and age of the study sample. Crossbite, Mandibular asymmetry, Panoramic.
所有作者都认为后牙反合是一种影响下颌生长并可能导致骨骼不对称的错牙合畸形，但关于在哪个年龄段这些改变易于量化的数据很少。
在本研究中，研究人员使用了217名6至9岁处于混合牙列期且患有单侧后牙反合的儿童的X线记录。所有水平变量均由首席研究员使用tpsDig版本2计算机程序进行追踪和评估。随后，使用适用于Windows的SPSS 17.0程序进行描述性和统计分析。
在分析了X线片上的下颌垂直轨迹后，研究人员发现，在所有病例中，反合侧与非反合侧之间存在可量化的差异。对于整个样本（H3-H4）、男孩组（H3-H4）以及7岁年龄组（H1-H2和H3-H4），水平变量之间的差异具有统计学意义（<0.005）。观察到反合侧与非反合侧之间水平测量值大小的差异。其中一些差异根据研究样本的性别和年龄具有显著性。反合、下颌不对称、全景片。
