To assess the anatomy of the mandibular buccal shelf (MBS) with cone-beam computed tomography (CBCT) and to identify the region of miniscrew implantation for the distalization of mandibular dentition. The MBS was assessed in 80 patients at four regions as follows: (i) between the buccal root of the mandibular second premolar and the mesiobuccal root of the first molar (L5b–L6mb), (ii) between the mesiodistal root of the first molar (L6mb–L6db), (iii) between the distobuccal root of the first molar and the mesiobuccal root of the second molar (L6db–L7mb), and (iv) between the mesiodistal roots of the second molar (L7mb–L7db). The buccal alveolar bone thickness, the narrowest inter-radicular space at the buccal side of the roots, and the distance between the implantation site and the mandibular neural tube were measured at horizontal planes of 3, 5, 7, and 9 mm from the alveolar crest. The buccal alveolar bone thickness increased from the premolar to the molar and from the crest edge to the mandibular roots. The L7mb–L7db region had the thickest buccal alveolar bone of 7.61 mm at a plane of 9 mm. The buccal inter-radicular spaces were smallest in the L7mb–L7db region and greatest in the L6db–L7mb region. The distances from the implantation site to the mandibular neural tube at planes of 3, 5, 7, and 9 mm were all > 13 mm from the L6 region to the L7 region. The L6db–L7mb region should be the first choice for miniscrew implantation in the MBS for the distalization of mandibular dentition.

中文翻译：

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使用CBCT进行下颌牙列远侧化的微螺钉植入的安全区域

用锥束计算机断层扫描（CBCT）评估下颌颊支架（MBS）的解剖结构，并确定用于下颌牙列远侧化的微螺钉植入区域。在以下四个区域的80例患者中评估了MBS：（i）下颌第二前磨牙的颊齿根与第一磨牙的近颊舌根（L5b–L6mb）之间；（ii）第一磨牙的近颌骨根之间（L6mb–L6db），（iii）第一磨牙的臼齿根与第二磨牙的近颊舌根之间（L6db–L7mb），以及（iv）第二磨牙的近中颌牙根之间（L7mb–L7db）。在3、5、5、5、5、5、5、5、5、5、5、5、5、5、5、5、5、5、5、5、5、5、6、5、5、5、5、5、5、5、5、6、5、5、5、5、5、5、6、5、5、6、5、5、5、5、5、6、5有的水平面都测定了牙槽骨的厚度，根的颊侧最窄的根际间隙，植入部位与下颌神经管的距离。7，距牙槽9毫米。从前磨牙到磨牙，从牙顶边缘到下颌根，颊齿槽骨厚度增加。L7mb–L7db区域在9 mm平面上具有7.61 mm的最厚颊泡齿骨。颊部根际间隙在L7mb–L7db区域最小，在L6db–L7mb区域最大。从L6区域到L7区域，在3、5、7和9 mm平面上从植入部位到下颌神经管的距离均> 13 mm。L6db–L7mb区域应该是MBS中微螺钉植入术的下颌牙列远侧化的首选。L7mb–L7db区域在9 mm平面上具有7.61 mm的最厚颊泡齿骨。颊部根际间隙在L7mb–L7db区域最小，在L6db–L7mb区域最大。从L6区域到L7区域，在3、5、7和9 mm平面上从植入部位到下颌神经管的距离均> 13 mm。L6db–L7mb区域应该是MBS中微螺钉植入术的下颌牙列远侧化的首选。L7mb–L7db区域在9 mm平面上具有7.61 mm的最厚颊泡齿骨。颊部根际间隙在L7mb–L7db区域最小，在L6db–L7mb区域最大。从L6区域到L7区域，在3、5、7和9 mm平面上从植入部位到下颌神经管的距离均> 13 mm。L6db–L7mb区域应该是MBS中微螺钉植入术的下颌牙列远侧化的首选。