Tian Xiao-Mei, Qian Liang, Xin Xian-Zhen, Wei Bin, Gong Yao
Department of Prosthodontics, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China.
Stomatology Special Consultation Clinic, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China.
J Endod. 2016 Mar;42(3):371-7. doi: 10.1016/j.joen.2015.10.017. Epub 2015 Dec 19.
It is known that the level of the maxillary sinus floor varies with age. Because few studies have investigated whether the position of the posterior roots relative to the maxillary sinus varied with the variation of the sinus floor or not, the present study assessed the position according to age.
Cone-beam computed tomographic images of 848 patients were reconstructed to evaluate the position of the posterior roots relative to the sinus floor, which were divided into 3 types, and quantify the distances between posterior root apexes and the adjacent border of the sinus floor. Measurements were taken for each root, and data were correlated with age, which was divided into 4 groups (≤20 years, 21-40 years, 41-60 years, and >60 years).
A total of 3063 premolars and 3095 molars were evaluated. The mean distances from the root tips to the border of the maxillary sinus floor increased with increasing age. From the first and second premolar roots, the mean distances ranged from 3.6 ± 4.1 mm to 8.9 ± 4.6 mm and from 0.7 ± 3.3 mm to 5.3 ± 3.9 mm, respectively. From the mesiobuccal, distobuccal, and palatinal roots of the first molars, the mean distances were -0.4 ± 2.8 mm to 4.6 ± 4.0 mm, -0.3 ± 2.4 mm to 4.4 ± 3.8 mm, and -0.4 ± 3.5 mm to 3.9 ± 4.1 mm, respectively. From the mesiobuccal, distobuccal, and palatinal roots of the second molars, the mean distances were -0.5 ± 2.2 mm to 3.4 ± 3.5 mm, 0.3 ± 2.2 mm to 3.9 ± 3.7 mm, and 1.1 ± 3.2 mm to 4.6 ± 4.5 mm, respectively. The frequency of type IS decreased with increasing age. It was very low in first premolars (0%-8.13%) and higher in second premolars (0%-25.68%), first molars (0%-44.75%), and second molars (0%-32.89%). Age significantly influenced the mean distances to the sinus floor and the frequencies of type IS (inside).
Cone-beam computed tomographic imaging is an effective method to study the position of the posterior roots to the maxillary sinus floor. Variation in proximity measurements was found by age, with those under the age of 40 showing a greater likelihood of the position of maxillary roots above/inside the sinus floor.
已知上颌窦底的水平随年龄变化。由于很少有研究调查后牙根相对于上颌窦的位置是否随窦底的变化而变化，因此本研究根据年龄评估了该位置。
重建848例患者的锥束计算机断层扫描图像，以评估后牙根相对于窦底的位置，将其分为3种类型，并量化后牙根尖与窦底相邻边界之间的距离。对每颗牙根进行测量，并将数据与年龄相关联，年龄分为4组（≤20岁、21 - 40岁、41 - 60岁和>60岁）。
共评估了3063颗前磨牙和3095颗磨牙。从根尖到上颌窦底边界的平均距离随年龄增加而增加。对于第一和第二前磨牙根，平均距离分别为3.6±4.1毫米至8.9±4.6毫米和0.7±3.3毫米至5.3±3.9毫米。对于第一磨牙的近中颊根、远中颊根和腭根，平均距离分别为 - 0.4±2.8毫米至4.6±4.0毫米、 - 0.3±2.4毫米至4.4±3.8毫米和 - 0.4±3.5毫米至3.9±4.1毫米。对于第二磨牙的近中颊根、远中颊根和腭根，平均距离分别为 - 0.5±2.2毫米至3.4±3.5毫米、0.3±2.2毫米至3.9±3.7毫米和1.1±3.2毫米至4.6±4.5毫米。IS型的频率随年龄增加而降低。在第一前磨牙中非常低（%0 - 8.13），在第二前磨牙中较高（%0 - 25.68），在第一磨牙中（%0 - 44.75），在第二磨牙中（%0 - 32.89）。年龄显著影响到窦底的平均距离和IS型（内部）的频率。
锥束计算机断层扫描成像是研究后牙根相对于上颌窦底位置的有效方法。发现接近度测量值随年龄变化，40岁以下者上颌牙根位于窦底上方/内部的可能性更大。
