Abstract：
OBJECTIVE: Mucous retention cysts (MRCs) of the maxillary sinuses are incidental findings in radiographs of the oral and maxillofacial structures. These cysts usually appear as rounded, dome-shaped, and soft-tissue masses, most often on the floor of the maxillary sinus. The aim of this study was to determine the prevalence of maxillary antral MRC and the effect of seasonal variation, sex and age in cone beam computed tomography (CBCT) images.
METHODS: In this simple, nonrandomized, cross-sectional study, CBCT images of patients were reviewed to evaluate the prevalence of MRCs and its location in the antrum, uni or bilateral, size, and season in which MRC occurred. The findings were analyzed using Statistical software SPSS and t-tests (P > 0.05).
RESULTS: A total of 765 CBCT images were evaluated (380 males and 385 females); 180 were suggestive of MRCs, 110 occurred in males (28.9%) while 70 (18.2%) occurred in females, which resulted in a prevalence of 23.5%. The peak prevalence of MRC was found in spring (41.6% of all radiographs), but there was no significant statistical difference between the occurrence of MRCs in different seasons (P > 0.05).
CONCLUSIONS: This study showed no significant difference between the occurrences of MRCs in different seasons. There was no significant difference between male and female and different decades of life. Furthermore, there was no significant difference between the involvement of right and left maxillary sinuses and different walls of the antrum.
METHODS: In this simple, nonrandomized, cross-sectional study, CBCT images of patients were reviewed to evaluate the prevalence of MRCs and its location in the antrum, uni or bilateral, size, and season in which MRC occurred. The findings were analyzed using Statistical software SPSS and t-tests (P > 0.05).
RESULTS: A total of 765 CBCT images were evaluated (380 males and 385 females); 180 were suggestive of MRCs, 110 occurred in males (28.9%) while 70 (18.2%) occurred in females, which resulted in a prevalence of 23.5%. The peak prevalence of MRC was found in spring (41.6% of all radiographs), but there was no significant statistical difference between the occurrence of MRCs in different seasons (P > 0.05).
CONCLUSIONS: This study showed no significant difference between the occurrences of MRCs in different seasons. There was no significant difference between male and female and different decades of life. Furthermore, there was no significant difference between the involvement of right and left maxillary sinuses and different walls of the antrum.
摘要：
目的：上颌窦的黏液滞留囊肿（MRC）是口腔颌面结构X线片上的偶然发现。这些囊肿通常表现为圆形，圆顶形,和软组织肿块，通常在上颌窦的底部。这项研究的目的是确定上颌窦MRC的患病率和季节性变化的影响，锥形束计算机断层扫描（CBCT）图像中的性别和年龄。
方法：在这个简单的，非随机化，横断面研究，回顾患者的CBCT图像以评估MRC的患病率及其在窦的位置，单一或双边，尺寸,以及MRC发生的季节。结果采用统计学软件SPSS和t检验(P>0.05)。
结果：共评估了765张CBCT图像（男性380张，女性385张）；180张提示MRC，110例发生在男性（28.9%），70例（18.2%）发生在女性，导致患病率为23.5%。MRC的流行高峰出现在春季(占所有射线照片的41.6%),但不同季节MRC发生率差异无统计学意义(P>0.05)。
结论：这项研究表明，不同季节MRC的发生没有显着差异。男性和女性之间以及不同的几十年生活之间没有显着差异。此外，左右上颌窦受累与不同胃壁之间无明显差异。
方法：在这个简单的，非随机化，横断面研究，回顾患者的CBCT图像以评估MRC的患病率及其在窦的位置，单一或双边，尺寸,以及MRC发生的季节。结果采用统计学软件SPSS和t检验(P>0.05)。
结果：共评估了765张CBCT图像（男性380张，女性385张）；180张提示MRC，110例发生在男性（28.9%），70例（18.2%）发生在女性，导致患病率为23.5%。MRC的流行高峰出现在春季(占所有射线照片的41.6%),但不同季节MRC发生率差异无统计学意义(P>0.05)。
结论：这项研究表明，不同季节MRC的发生没有显着差异。男性和女性之间以及不同的几十年生活之间没有显着差异。此外，左右上颌窦受累与不同胃壁之间无明显差异。
