The maxillary sinus or antrum is the largest of the paranasal sinuses. It is located in the maxillary bone and has a proximity to the apexes of upper molars and premolars, which allows it to form a direct link between the sinus and the oral cavity. Dislocation of a foreign body or tooth to the interior of a paranasal sinus is a situation that can occur as a result of car accidents, firearm attacks, or iatrogenic in surgical procedures. Therefore, it is necessary to know how to treat this kind of situation. This study's objective is to report the case of a 23-year-old female patient, leucoderma, who sought treatment from the Surgical Unit at the Dental Faculty of the Federal University of Sergipe. She had a history of pain and edema in the right side of the genian region and two failed attempts at removing dental unit (DU) 18. The extraoral clinical exam revealed intense edema of the left hemiface with signs of infection, excoriation of the labial commissure, hematoma, a body temperature of 39°C, and a limited ability to open her mouth. The patient was medicated and treated surgically. The tooth was removed from the maxillary sinus with caution, as should have been done initially.

ResumoIntrodução: Uma infecção crônica nos tecidos periapicais pode desencadear uma lesão periapical em função da estimulação e da proliferação dos restos epiteliais de Malassez. Ao estudo microscópico, é possível detectar a presença de fendas de cristais de colesterol no interior de cistos e granulomas. De acordo com alguns estudos, a origem do colesterol no interior de lesões no periápice pode ser, parcialmente, por causa da condensação e da cristalização de colesterol dentro da parede do cisto. Outros estudos afirmam que a presença de colesterol pode ser derivada de produtos metabólicos locais ou da circulação vascular. Objetivo: O presente estudo teve por objetivo analisar a relação entre as fendas de cristais de colesterol encontradas nas lesões periapicais e os níveis de colesterol sérico. Material e método: Estudo observacional de natureza descritiva, que incluiu 70 pacientes portadores de lesões periapicais, de acordo com exame radiográfico, atendidos no Departamento de Odontologia da Universidade Federal de Sergipe. Esses pacientes foram submetidos à exodontia da unidade dentária acometida e à remoção da lesão periapical, sendo esta peça encaminhada para exame anatomopatológico. Na mesma consulta, era solicitado um lipidograma para avaliação das taxas de colesterol sérico dos pacientes. Resultado: Fendas de cristais de colesterol estavam presentes apenas em cistos grandes (maiores que 1,5 cm de diâmetro, aproximadamente) e, portanto, mais antigos. Conclusão: A presença de cristais de colesterol é rara nas lesões periapicais. O estudo sugere uma relação entre a presença dos cristais de colesterol e o índice de colesterol sérico elevado, em lesões grandes e antigas.Descritores: Cisto radicular; granuloma periapical; colesterol. AbstractIntroduction: A chronic infection in periapical tissue can trigger a periapical lesion due to stimulation and proliferation of epithelial rests of Malassez. On microscopic study, it is possible to detect the presence of clefts of cholesterol crystals within cysts and granulomas. According to some studies, the source of cholesterol inside the periapice lesions may be partially due to the condensation and crystallization of cholesterol in the cyst wall. Yet another part, can be derived metabolic products local or vascular circulation. Objective: This study aimed to analyze the relationship between the clefts of cholesterol crystals found in periapical lesions and cholesterol levels in the blood circulation. Material and method: An observational study of a descriptive nature that included 70 patients with periapical lesions (according to radiographic examination) at the Department of Dentistry, Federal University of Sergipe. These patients underwent extraction of the affected tooth unit and removal of the periapical lesion, and this number sent for pathological examination. At the same query was asked a lipid profile to assess rates of serum cholesterol of patients. Result: Clefts of cholesterol crystals were present only in cysts (larger than 1.5 cm in diameter, approximately...