Shahidi Shoaleh, Zamiri Barbad, Abolvardi Masoud, Akhlaghian Marzieh, Paknahad Maryam
Dept. of Oral and Maxillofacial Radiology, Biomaterials Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Dept. of Oral and Maxillofacial Surgery, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
J Dent (Shiraz). 2018 Jun;19(2):83-91.
Accurate measurement of the available bone height is an essential step in the pre-surgical phase of dental implantation. Panoramic radiography is a unique technique in the pre-surgical phase of dental implantations because of its low cost, relatively low-dose, and availability.
This article aimed to assess the reliability of dental panoramic radiographs in the accurate measurement of the vertical bone height with respect to the horizontal location of the alveolar crest.
132 cone-beam computed tomography (CBCT) of the edentulous mandibular molar area and dental panoramic radiograph of 508 patients were selected. Exclusion criteria were bone abnormalities and detectable ideal information on each modality. The alveolar ridge morphology was categorized into 7 types according to the relative horizontal location of the alveolar crest to the mandibular canal based on CBCT findings. The available bone height (ABH) was defined as the distance between the upper border of the mandibular canal and alveolar crest. One oral radiologist and one oral surgeon measured the available bone height twice on each modality with a 7-dayinterval.
We found a significant correlation between dental panoramic radiographs and cone-beam computed tomography values (ICC=0.992, < 0.001). A positive correlation between the horizontal distance of the alveolar crest to the mandibular canal and measured differences between two radiographic modalities had been found (r=0.755, < 0.001). For each single unit of increase in the horizontal distance of the alveolar crest to the mandibular canal, dental panoramic radiographs showed 0.87 unit of overestimation (< 0.001).
Dental panoramic radiographs can be employed safely in the pre-surgical phase of dental implantation in posterior alveolus of mandible, especially in routine and simple cases.
准确测量可用骨高度是牙种植术前阶段的关键步骤。全景放射摄影术在牙种植术前阶段是一种独特的技术，因其成本低、剂量相对较低且易于获得。
本文旨在评估牙全景放射片在准确测量垂直骨高度方面相对于牙槽嵴水平位置的可靠性。
选取508例患者的无牙下颌磨牙区的132张锥形束计算机断层扫描（CBCT）图像和牙全景放射片。排除标准为骨异常以及每种检查方式中可检测到的理想信息。根据CBCT结果，根据牙槽嵴相对于下颌管的相对水平位置，将牙槽嵴形态分为7种类型。可用骨高度（ABH）定义为下颌管上缘与牙槽嵴之间的距离。一名口腔放射科医生和一名口腔外科医生在每种检查方式上间隔7天测量两次可用骨高度。
我们发现牙全景放射片与锥形束计算机断层扫描值之间存在显著相关性（ICC = 0.992，<0.001）。已发现牙槽嵴到下颌管的水平距离与两种放射检查方式之间的测量差异呈正相关（r = 0.755，<0.001）。牙槽嵴到下颌管的水平距离每增加一个单位，牙全景放射片显示高估0.87个单位（<0.001）。
牙全景放射片可安全用于下颌后牙区牙种植的术前阶段，尤其是在常规和简单病例中。
