Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Ortodontia (Bauru/SP, Brazil).
Universidade Federal do Rio Grande do Sul, Faculdade de Odontologia, Departamento de Ortodontia (Porto Alegre/RS, Brazil).
Dental Press J Orthod. 2020 Nov-Dec;25(6):33-42. doi: 10.1590/2177-6709.25.6.033-042.oar.
Controversial reports suggest a relationship between growth pattern and cortical alveolar bone thickness, and its effect in the use of mini-implants.
The main purpose of this study was to assess the influence of the growth pattern on the cortical alveolar bone thickness and on the stability and success rate of mini-implants.
Fifty-six mini-implants were inserted in the buccal region of the maxilla of 30 patients. These patients were allocated into two groups, based on their growth pattern (horizontal group [HG] and vertical group [VG]). Cortical thickness was measured using Cone Beam Computed Tomography. Stability of mini-implants, soft tissue in the insertion site, sensitivity during loading and plaque around the mini-implants were evaluated once a month. Intergroup comparisons were performed using t tests, Mann-Whitney tests, and Fisher exact tests. Correlations were evaluated with Pearson's correlation coefficient.
The cortical bone thickness was significantly greater in the HG at the maxillary labial anterior region and at the mandibular buccal posterior and labial anterior regions. There was a significant negative correlation between Frankfort-mandibular plane angle (FMA) and the labial cortical thickness of the maxilla, and with the labial and lingual cortical bone thicknesses of the mandible. No significant intergroup difference was found for mini-implant mobility and success rate. No associated factor influenced stability of the mini-implants.
Growth pattern affects the alveolar bone cortical thickness in specific areas of the maxilla and mandible, with horizontal patients presenting greater cortical bone thickness. However, this fact may have no influence on the stability and success rate of mini-implants in the maxillary buccal posterior region.
有争议的报告表明，生长模式与皮质牙槽骨厚度之间存在关系，并且其对微型种植体的使用有影响。
本研究的主要目的是评估生长模式对皮质牙槽骨厚度以及微型种植体稳定性和成功率的影响。
将 56 个微型种植体插入 30 名患者上颌骨的颊侧区域。这些患者根据其生长模式（水平组[HG]和垂直组[VG]）分为两组。使用锥形束计算机断层扫描测量皮质厚度。每月评估一次微型种植体的稳定性、植入部位的软组织、加载时的敏感性以及微型种植体周围的菌斑。使用 t 检验、Mann-Whitney 检验和 Fisher 确切检验进行组间比较。使用 Pearson 相关系数评估相关性。
HG 在上颌唇侧前区和下颌颊侧后区和唇侧前区的皮质骨厚度明显更大。法兰克福-下颌平面角（FMA）与上颌唇侧皮质厚度呈显著负相关，与下颌唇侧和舌侧皮质骨厚度呈显著负相关。微型种植体的移动性和成功率在组间无显著差异。没有任何相关因素影响微型种植体的稳定性。
生长模式会影响上颌和下颌特定区域的牙槽骨皮质厚度，水平生长的患者皮质骨厚度更大。然而，这一事实可能对上颌颊侧后区微型种植体的稳定性和成功率没有影响。
