Seattle Science Foundation, Seattle, Washington.
Dental and Oral Medical Center, Kurume University School of Medicine, Fukuoka, Japan.
Clin Anat. 2020 Mar;33(2):223-231. doi: 10.1002/ca.23456. Epub 2019 Sep 8.
Our goal was to clarify the relationship between the superior wall of the mandibular canal and the presence of teeth. We also sought to study the structural changes of the mandibular canal after tooth loss. Twenty sides from 10 dry mandibles derived from six males and four females were used for this study. The age of the specimens at the time of death ranged from 57 to 91 years. The mandibles were cut in the midline resulting in 20 hemi-mandibles. The presence of teeth (from the second premolar to the third molar) was recorded for each hemi-mandible. The mandibular canal in the body of the mandible was divided into four areas, that is, Areas 1-4. The superior wall of the mandibular canal and a cancellous bone pattern above the mandibular canal were observed. Next, the mandibular canal was horizontally cut at its center and the superior wall of the mandibular canal observed inferiorly. A total of 75 areas (20 dentulous areas and 55 edentulous areas) were produced. The distal view was classified into three groups, Type I (trabecular pattern), Type II (osteoporotic pattern), and Type III (dense/irregular pattern). The Type I pattern was found in 60.0% (12/20) of the dentulous areas and 32.7% of the edentulous areas. While the Type II pattern was found in 15.0% (23/55) of the dentulous areas and 41.8% of the edentulous areas. The inferior view was classified into four groups depending on the surface of the superior wall of the mandibular canal, that is, Class I (trabecular pattern), Class II (osteoporotic pattern), Class III (dense/irregular pattern), and Class IV (smooth).The Class I pattern was seen most frequently (55.0%) in dentulous areas and the Class IV pattern (45.5%) most frequently in edentulous areas. Based on these results, we conclude that the superior wall of the mandibular canal could change following tooth loss. Clin. Anat. 33:223-231, 2020. © 2019 Wiley Periodicals, Inc.
我们的目标是阐明下颌管的上壁与牙齿存在之间的关系。我们还试图研究牙齿缺失后下颌管的结构变化。本研究使用了来自 6 名男性和 4 名女性的 10 个干下颌骨的 20 侧。标本死亡时的年龄范围为 57 至 91 岁。将下颌骨从中线切开，得到 20 个半下颌骨。记录每个半下颌骨的牙齿存在情况（从第二前磨牙到第三磨牙）。下颌管在下颌体部分为四个区域，即区域 1-4。观察下颌管的上壁和下颌管上方的松质骨模式。然后，在下颌管的中心水平切开下颌管，并观察其下壁。总共产生了 75 个区域（20 个有牙区和 55 个无牙区）。远视图分为三组，I 型（小梁模式）、II 型（骨质疏松症模式）和 III 型（致密/不规则模式）。I 型模式在 60.0%（20/20）的有牙区和 32.7%的无牙区中发现。而 II 型模式在 15.0%（23/55）的有牙区和 41.8%的无牙区中发现。下视图根据下颌管上壁的表面分为四组，即 I 类（小梁模式）、II 类（骨质疏松症模式）、III 类（致密/不规则模式）和 IV 类（光滑模式）。I 类模式在有牙区最常见（55.0%），而 IV 类模式（45.5%）在无牙区最常见。基于这些结果，我们得出结论，下颌管的上壁可能会在牙齿缺失后发生变化。临床解剖学 33:223-231,2020。© 2019 威利父子公司
