评估全景片上的放射影像学征象来判断下颌第三磨牙与下牙槽神经管之间的关系的可靠性。
Assessment of the reliability of radiographic signs on panoramic radiographs to determine the relationship between mandibular third molars and the inferior alveolar canal.
机构信息
Assistant Professor, University of Health Sciences, Faculty of Dentistry, Department of Dentomaxillofacial Radiology, Istanbul, Turkey; Instructor, Eastern Mediterranean University, Faculty of Dentistry, Department of Dentomaxillofacial Radiology, Famagusta, North Cyprus.
Professor, Department of Dentomaxillofacial Radiology, Ondokuz Mayıs University, Faculty of Dentistry, Samsun, Turkey.
出版信息
Oral Surg Oral Med Oral Pathol Oral Radiol. 2020 Mar;129(3):260-271. doi: 10.1016/j.oooo.2019.09.008. Epub 2019 Sep 17.
OBJECTIVE
To assess the reliability of radiographic signs of the relationship between impacted mandibular third molars (IMTMs) and the inferior alveolar canal (IAC), and the vertical relationship between IMTM and IAC on panoramic radiographs (PRs) as risk indicators for IAC exposure during extraction.
STUDY DESIGN
Seven radiographic signs regarding the appearance of roots and the IAC were assessed as present or absent on PRs. The vertical relationship between IMTM and the IAC was divided into 3 levels. The correlation between radiographic data and IAC exposure during extraction was analyzed by using χ statistics and logistic regression analysis.
RESULTS
In total, 198 IMTMs were examined. In 46 cases (23.2%), the IAC was exposed during extraction. Four radiographic signs-darkening of the root, narrowing of the root, narrowing of the IAC, and diversion of the IAC-were associated with IAC exposure (P < .05). Concurrence of 2 or more of 7 radiographic signs increased the risk of IAC exposure (P < .001). The vertical relationship between IMTM and the IAC was found to be a risk indicator for IAC exposure (P < .001). No significant correlation was found between IAC exposure and inferior alveolar nerve damage (P = .148).
CONCLUSIONS
Panoramic radiography is useful for assessing the risk of IAC exposure during IMTM extraction.
目的
评估下颌阻生第三磨牙（IMTM）与下牙槽神经管（IAC）之间关系的放射学征象，以及在全景片（PR）上 IMTM 与 IAC 之间垂直关系作为提取过程中 IAC 暴露的风险指标的可靠性。
研究设计
在 PR 上评估了 7 个关于根外观和 IAC 的放射学征象是否存在。IMTM 与 IAC 之间的垂直关系分为 3 个水平。通过 χ 统计和逻辑回归分析，分析了放射学数据与提取过程中 IAC 暴露之间的相关性。
结果
共检查了 198 颗 IMTM。在 46 例（23.2%）中，在提取过程中暴露了 IAC。4 个放射学征象——根变暗、根变窄、IAC 变窄和 IAC 分流——与 IAC 暴露相关（P <.05）。同时存在 7 个放射学征象中的 2 个或更多增加了 IAC 暴露的风险（P <.001）。IMTM 与 IAC 之间的垂直关系被发现是 IAC 暴露的风险指标（P <.001）。未发现 IAC 暴露与下牙槽神经损伤之间存在显著相关性（P = .148）。
结论
全景片有助于评估 IMTM 提取过程中 IAC 暴露的风险。
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