Department of Dentistry and School of Dentistry, National Taiwan University Hospital and National Taiwan University Medical College, Taipei, Taiwan.
Chang Gung University of Science and Technology, Kwei-Shan, Taoyuan City, Taiwan; Department of Dentistry, Chang Gung Memorial Hospital, Taiwan.
J Endod. 2017 May;43(5):687-693. doi: 10.1016/j.joen.2016.12.009. Epub 2017 Mar 11.
A vertical root fracture (VRF) is a root fracture extending along the longitudinal axis of roots and is often noted in endodontically treated teeth. However, the clinical and radiographic characteristics of VRFs are not completely known.
A total of 65 teeth with 68 vertical fractured roots in 58 Chinese patients were investigated. The clinical examination records and radiographic images were reviewed in detail.
A total of 24 male (41.38%) and 34 female (58.62%) patients aged 25-90 years (average = 57 years) were included; 51 (87.93%) and 7 (12.07%) patients exhibited 1 tooth and 2 teeth with VRFs, respectively, in the dentition. VRFs occurred mainly in the mesial root (20 roots, 57.14%) of the mandibular molars (29 teeth, 44.62%). Clinically, teeth with VRFs usually presented a periodontal probing depth >5 mm (44 teeth, 91.67%, P < .001) with a prosthesis (55 teeth, 84.62%, P < .001) and a relatively intact dentition (42 patients exhibited <4 missing teeth in the dentition, 77.78%, P < .001). Most of the nonendodontically treated VRFs exhibited attrited occlusal surfaces. Radiographic characteristics of the teeth with VRFs were typically associated with prior root canal treatment (56 teeth, 86.15%, P < .001), periodontal bone loss (62 teeth, 95.38%, P < .001), apical bone loss (52 teeth, 80.00%, P < .001), and periodontal ligament widening (61 teeth, 93.85%, P < .001). The mesial roots of the mandibular molars were most susceptible to VRFs in both endodontically and nonendodontically treated teeth.
These results elucidated some clinical and radiographic and diagnostic features that facilitate VRF identification.
垂直根折（VRF）是一种沿着牙根长轴延伸的根折，通常发生在根管治疗过的牙齿中。然而，VRF 的临床和影像学特征并不完全清楚。
共调查了 58 名中国患者的 65 颗有 68 个垂直裂根的牙齿。详细回顾了临床检查记录和影像学图像。
共纳入 24 名男性（41.38%）和 34 名女性（58.62%），年龄 25-90 岁（平均 57 岁）；51 名（87.93%）和 7 名（12.07%）患者的牙列中分别有 1 颗和 2 颗 VRF 牙。VRF 主要发生在下颌磨牙的近中根（20 根，57.14%），共 29 颗（44.62%）。临床上，VRF 牙通常表现为牙周探诊深度>5mm（44 颗，91.67%，P<.001），有修复体（55 颗，84.62%，P<.001）和相对完整的牙列（42 名患者牙列缺失<4 颗牙，77.78%，P<.001）。大多数未经根管治疗的 VRF 牙表现为磨损的咬合面。有 VRF 牙的影像学特征通常与先前的根管治疗（56 颗，86.15%，P<.001）、牙周骨丧失（62 颗，95.38%，P<.001）、根尖骨丧失（52 颗，80.00%，P<.001）和牙周韧带增宽（61 颗，93.85%，P<.001）有关。下颌磨牙的近中根在根管治疗和非根管治疗的牙齿中最容易发生 VRF。
这些结果阐明了一些有助于识别 VRF 的临床、影像学和诊断特征。
