Tavares Alana, Braga Emanuel, Neves Frederico Sampaio
Post-graduate Program in Dentistry and Health, School of Dentistry, Federal University of Bahia, Ufba, Brazil.
Department of Orthodontics, School of Dentistry, Federal University of Bahia, Ufba, Brazil.
Orthod Craniofac Res. 2023 May;26(2):224-230. doi: 10.1111/ocr.12604. Epub 2022 Sep 1.
The aim of the present study was to evaluate the thickness of the hard palate at the different angles formed by the palatal plane and the Frankfort horizontal line using computed tomography in patients with different facial patterns for planning the installation of MARPE.
The measurements were analysed in the hard palate of 106 patients. Four regions were selected passing through the mesial face, tangent at the level of the cemento-enamel junction of the premolars and molars. The bone thickness was measured from the floor of the nasal cavity to the cortical bone of the hard palate, 02 measurements with a distance of 05 mm between them (2.5 mm on each side starting from the midsagittal line) and 2 more with a distance of 7 mm between measurements (3.5 mm on each side starting from the midsagittal line). The palatal plane cant was determined based on the palatal plane and the Frankfort horizontal plane. The sagittal skeletal pattern was determined based on the ANB angle and the vertical skeletal pattern based on the SN.Go.Gn angle.
Palatal bone thickness was greater in males than in females. Regarding the sagittal skeletal pattern, patients with Class II were found to have a thinner hard palate than Class I and Class III patients. No difference in the vertical skeletal pattern was observed between groups. Regarding the palatal plane cant, bone thickness was greater in patients with clockwise rotation.
Careful planning should be considered in the case of female patients; patients with greater angles of the palatal plane cant and Class II patients have a smaller bone thickness.
本研究的目的是使用计算机断层扫描评估不同面型患者中，腭平面与法兰克福水平线形成的不同角度下硬腭的厚度，以便为MARPE的安装制定计划。
对106例患者的硬腭进行测量分析。选择四个区域，穿过近中面，在第一前磨牙和磨牙的牙骨质-釉质界水平相切。测量从鼻腔底部到硬腭皮质骨的骨厚度，进行两次测量，两次测量之间的距离为05毫米（从矢状中线开始，每侧2.5毫米），再进行两次测量，测量之间的距离为7毫米（从矢状中线开始，每侧3.5毫米）。根据腭平面和法兰克福水平面确定腭平面倾斜度。根据ANB角确定矢状骨骼型，根据SN.Go.Gn角确定垂直骨骼型。
男性的腭骨厚度大于女性。关于矢状骨骼型，发现II类患者的硬腭比I类和III类患者薄。各垂直骨骼型组间未观察到差异。关于腭平面倾斜度，顺时针旋转的患者骨厚度更大。
对于女性患者应考虑仔细规划；腭平面倾斜度较大的患者和II类患者的骨厚度较小。
