Proximity of the Mandibular Canal to Teeth and Cortical Bone

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• 作者：Yusuke Kawashima ; DDS^&lowast ; ; ^&dagger ; ; ^{yusukekawashima05@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Osamu Sakai ; MD ; PhD^&Dagger ; ; ^§ ; ; Dhurata Shosho ; MD ; MA^‖ ; Takashi Kaneda ; DDS ; PhD^&dagger ; ; Anita Gohel ; BDS ; PhD^‖
• 关键词：Inferior alveolar nerve ; mandibular canal ; mandibular cortex ; mandibular second molar
• 刊名：Journal of Endodontics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：42
• 期：2
• 页码：221-224
• 全文大小：218 K

文摘

The proximity of the inferior alveolar canal to the mandibular molar roots may pose a risk of injury during various dental surgeries. The purpose of this study was to evaluate age-related and gender-related changes by using cone-beam computed tomography images between the roots of the second molars, mandibular cortex, and the inferior alveolar canal.

<h4 id="absSec_2">Methodsh4>

One hundred fifty-five patients (68 men, 87 women), 20 years and older, who had previous cone-beam computed tomography scans were enrolled in this study. The patients were subcategorized by gender and age (group I, <21 years; group II, 21&ndash;40 years; and group III, >40 years). Distance between the mandibular canal (MC) and the second molar distal root apex as well as the 3 mandibular cortical regions (inferior cortex, buccal cortex, and lingual cortex) were measured.

<h4 id="absSec_3">Resultsh4>

In men, the second molar root apex to the MC distance was significantly shorter in group I than in group III (P < .01). In women, the second molar root apex to the MC distance was significantly shorter in group I than in group II and group III (P < .05). In both men and women, the buccal cortex of the mandible to the MC distance was significantly shorter on the right side compared with the left side (P < .01).

<h4 id="absSec_4">Conclusionsh4>

Our study shows that age, gender, and region have an influence on the location of the MC in the second molar area.