Scholarlink

Background <p>The purpose of this study was to obtain measurements of the anatomical structures of the mandibular buccal shelf (MBS) using cone-beam computed tomography (CBCT) for the safe insertion of orthodontic mini-implants.</p> Methods <p>The sample consisted of the CBCT records of 100 subjects. The scans were imported into a reconstruction program. Measurements were taken in the coronal plane for three different roots: the mandibular first molar distal root (6D), second molar mesial root (7&#xa0;M), and second molar distal root (7D). The inferior alveolar nerve canal (IANC) was used as a reference to determine the safe insertion depth. The roots of the mandibular molars were used as a reference to determine the maximum safe insertion angle. Analysis of variance with post hoc analysis and Kruskal-Wallis H test with post hoc analysis were used for data analysis.</p> Results <p>For the 6Ds, the average bone depth was 20.33 ± 3.6&#xa0;mm, the average depth above the IANC plane was 9.55 ± 2.97&#xa0;mm, and the average maximum safe insertion angle was 47.47 ± 18.94°. For the 7Ms, the average bone depth was 22.06 ± 2.85&#xa0;mm, the average depth above the IANC plane was 10.71 ± 2.67&#xa0;mm, and the average maximum safe insertion angle was 43.14 ± 15.26°. For the 7Ds, the average bone depth was 23.75 ± 2.86&#xa0;mm, the average depth above the IANC plane was 12.12 ± 2.61&#xa0;mm, and the average maximum safe insertion angle was 28.39 ± 10.96°. From anterior to posterior, the buccal bone depth and depth above the IANC gradually increased (<i>P</i> &lt; 0.01), there was no significant difference in the maximum safe insertion angle between the 6Ds and 7Ms (<i>P</i> = 1.000), but the significant difference was observed between 6Ds and 7Ds, 7Ms and 7Ds (<i>P</i> &lt; 0.000).</p> Conclusions <p>The optimal implantation site for mini-implant in the MBS is at the buccal site corresponding to the second molar. A maximum insertion length of ≤ 12&#xa0;mm and a maximum insertion angle which respects the long axial of the tooth root of ≤ 28° are recommended for the safe insertion of mini-implants in the MBS.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Measurements of the anatomical structures of the mandibular buccal shelf for the safe insertion of mini-implants: a cone-beam computed tomography retrospective study

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月14日

查看全文
  • Xing Fan,
  • Lixian Yuan,
  • Zhiwei Wang,
  • Ke Liu,
  • Baiting Luan,
  • Yi Wen,
  • Xin Liu

摘要

Background

The purpose of this study was to obtain measurements of the anatomical structures of the mandibular buccal shelf (MBS) using cone-beam computed tomography (CBCT) for the safe insertion of orthodontic mini-implants.

Methods

The sample consisted of the CBCT records of 100 subjects. The scans were imported into a reconstruction program. Measurements were taken in the coronal plane for three different roots: the mandibular first molar distal root (6D), second molar mesial root (7 M), and second molar distal root (7D). The inferior alveolar nerve canal (IANC) was used as a reference to determine the safe insertion depth. The roots of the mandibular molars were used as a reference to determine the maximum safe insertion angle. Analysis of variance with post hoc analysis and Kruskal-Wallis H test with post hoc analysis were used for data analysis.

Results

For the 6Ds, the average bone depth was 20.33 ± 3.6 mm, the average depth above the IANC plane was 9.55 ± 2.97 mm, and the average maximum safe insertion angle was 47.47 ± 18.94°. For the 7Ms, the average bone depth was 22.06 ± 2.85 mm, the average depth above the IANC plane was 10.71 ± 2.67 mm, and the average maximum safe insertion angle was 43.14 ± 15.26°. For the 7Ds, the average bone depth was 23.75 ± 2.86 mm, the average depth above the IANC plane was 12.12 ± 2.61 mm, and the average maximum safe insertion angle was 28.39 ± 10.96°. From anterior to posterior, the buccal bone depth and depth above the IANC gradually increased (P < 0.01), there was no significant difference in the maximum safe insertion angle between the 6Ds and 7Ms (P = 1.000), but the significant difference was observed between 6Ds and 7Ds, 7Ms and 7Ds (P < 0.000).

Conclusions

The optimal implantation site for mini-implant in the MBS is at the buccal site corresponding to the second molar. A maximum insertion length of ≤ 12 mm and a maximum insertion angle which respects the long axial of the tooth root of ≤ 28° are recommended for the safe insertion of mini-implants in the MBS.