Department of Otolaryngology, Xiamen Branch, Zhongshan Hospital, Fudan University.
Xiamen Medical College.
Ophthalmic Plast Reconstr Surg. 2021;37(5):439-443. doi: 10.1097/IOP.0000000000001892.
To investigate the anatomical structure characteristics of the frontal process of the maxilla in the medial wall of the lacrimal drainage system for endoscopic dacryocystorhinostomy based on the cone-beam computed tomography images.
One hundred eight sides of orbits were retrospectively evaluated in this study. The angulation and thickness of the frontal process of the maxilla in the medial wall of the lacrimal drainage system were measured and compared at 2 different levels: lacrimal sac level and nasolacrimal duct level. The vertical height between the 2 measurement levels was also measured. Data were compared between males and females.
The average angulation and thickness of the frontal process of the maxilla were found significantly larger at the lacrimal sac level than at the nasolacrimal duct level (83.1 ± 11.3° vs. 61.7 ± 10.9° and 2.7 ± 0.9 mm vs. 1.1 ± 0.4 mm) (p < 0.001). The vertical height between the 2 levels was significantly higher in males than in females (8.6 ± 1.8 mm vs. 7.8 ± 1.7 mm) (p = 0.015).
We found the angulation and thickness of the frontal process of the maxilla in the medial wall of the lacrimal drainage system decreased from the upper to the lower level. Starting the osteotomy during endoscopic dacryocystorhinostomy might be easier and safer at the midpoint level of the maxillary line.
基于锥形束 CT 图像，研究鼻内窥镜下泪囊鼻腔吻合术中泪液排出系统内侧壁上颌骨额突的解剖结构特征。
本研究回顾性评估了 108 侧眼眶。在泪囊水平和鼻泪管水平两个不同水平测量并比较了泪液排出系统内侧壁上颌骨额突的倾斜角和厚度，测量了两个测量水平之间的垂直高度。比较了男性和女性之间的数据。
上颌骨额突的平均倾斜角和厚度在泪囊水平显著大于鼻泪管水平（83.1±11.3°比 61.7±10.9°和 2.7±0.9 mm 比 1.1±0.4 mm）（p<0.001）。两个水平之间的垂直高度男性显著高于女性（8.6±1.8 mm 比 7.8±1.7 mm）（p=0.015）。
我们发现泪液排出系统内侧壁上颌骨额突的倾斜角和厚度从上到下逐渐减小。在鼻内窥镜下泪囊鼻腔吻合术中，从上颌线中点水平开始截骨可能更容易、更安全。
