Department of Oral Medicine and Radiology, Nair Hospital Dental College, Mumbai, Maharashtra, India.
Indian J Dent Res. 2020 Nov-Dec;31(6):911-915. doi: 10.4103/ijdr.IJDR_871_18.
The purpose of the study is to assess the vertical and horizontal relationship between the roots of maxillary posterior teeth and neighboring structures like the floor of the maxillary sinus and cortical plates using cone-beam computed tomography (CBCT).
100 CBCT scans of the patients from the Indian population were analyzed. Vertical and horizontal relationship between the roots of maxillary posterior teeth and the floor of the maxillary sinus was divided into 4 types and 3 types, respectively. Distances between the root apices and the floor of the maxillary sinus and cortical plate was measured for each root and results were formulated.
In total 365 teeth were assessed, 185 first molar and 180 second molar. It was found that the roots of first molar and second molar usually had type 2 (root apices in close contact with the floor of maxillary sinus) and type 3 (roots projecting laterally into the sinus, but its apices are outside the sinus border) vertical relationship respectively with the floor of maxillary sinus. The deepest portion of the floor of the maxillary sinus was most commonly seen projecting between buccal and palatal roots. The mean distance between the cortical plate and root was highest for the distobuccal root of second molar i.e., 1.20 mm SD = 0.97.
The distobuccal root of the first molar and mesiobuccal root of the second molar are closest to the sinus floor, hence clinician should be extra cautious while working on these roots during endodontic or surgical procedures in the Indian population.
本研究旨在使用锥形束 CT（CBCT）评估上颌后牙的根部与上颌窦底和骨皮质等邻近结构的垂直和水平关系。
分析了来自印度人群的 100 例 CBCT 扫描。上颌后牙根部与上颌窦底之间的垂直和水平关系分别分为 4 型和 3 型。测量每个牙根的根尖与上颌窦底和骨皮质板之间的距离，并制定结果。
共评估了 365 颗牙齿，其中第一磨牙 185 颗，第二磨牙 180 颗。结果发现，第一磨牙和第二磨牙的根部通常分别具有与上颌窦底的 2 型（根尖与上颌窦底紧密接触）和 3 型（根部向窦侧突出，但根尖在窦骨边缘之外）垂直关系。上颌窦底的最深部分最常见于颊根和腭根之间突出。第二磨牙远颊根与皮质板之间的平均距离最高，为 1.20 毫米，标准差为 0.97。
第一磨牙的远颊根和第二磨牙的近中颊根最接近窦底，因此在印度人群中进行根管或手术治疗这些牙根时，临床医生应格外小心。
