Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, 200011, China.
Stomatology Special Consultation Clinic, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, 200011, China.
Clin Implant Dent Relat Res. 2017 Jun;19(3):530-538. doi: 10.1111/cid.12474. Epub 2017 Feb 3.
Cone-beam computed tomography can accurately show anatomic structure of intrabony nerve canals in mandibular interforaminal region.
The aim was to evaluate the characteristics of intrabony nerve canals in mandibular interforaminal region by using cone-beam computed tomography (CBCT) and determine a safe zone for implant and bone harvesting.
Hemimandibles (824) CBCT images were obtained. The length of the anterior loop (AL), the length and diameter of the mandibular incisive canal (MIC) and its spatial distance in various landmarks were measured.
The prevalence of the AL was 93.57%, and the MIC was 97.33%. The mean lengths of the anterior extension of the anterior loop (aAL), caudal extension of the anterior loop (cAL) and the MIC were 2.53 ± 1.27 mm, 6.04 ± 1.66 mm, 9.97 ± 5.15 mm, respectively. The MIC was closer to buccal border and inferior margin of mandible. The length of the AL and diameter of the MIC varied with gender.
The safe zone recommended for implant surgery is 4 mm anterior and 8 mm inferior to the mental foramen, and 10 mm above the inferior margin of mandible. The chin bone should be harvested at least 10 mm below the tooth apices along with a limited depth of 4 mm.
锥形束 CT 能准确显示下颌骨间区骨内神经管的解剖结构。
本研究旨在利用锥形束 CT（CBCT）评估下颌骨间区骨内神经管的特征，并确定种植体和骨采集的安全区。
获取半下颌骨（824 例）CBCT 图像。测量前环的长度（AL）、下颌切牙管（MIC）的长度和直径及其在不同标志点的空间距离。
AL 的发生率为 93.57%，MIC 的发生率为 97.33%。前环前伸（aAL）、后伸（cAL）和 MIC 的平均长度分别为 2.53±1.27mm、6.04±1.66mm、9.97±5.15mm。MIC 更靠近颊侧和下颌骨下缘。AL 的长度和 MIC 的直径随性别而变化。
建议种植手术的安全区为颏孔前 4mm、下 8mm，下颌骨下缘上 10mm。颏部应在下颌牙尖下方至少 10mm 处采集，深度限制在 4mm 以内。
