BACKGROUND: Inflammatory fibrous hyperplasia associated with the use of removable dental prosthesis (IFH) is an adaptive lesion caused by long-term trauma exerted by a poorly adapted removable prosthesis on the oral mucosa, usually in the vestibular sulcus. Its diagnosis and treatment is imperative, due to its potential to cause discomfort to the patient, altering aesthetics, phonectics and chewing. CASE REPORTS: A 41-year-old denture wearer woman was referred due to discomfort in the right lower vestibular sulcus, the clinical examination showed a bilobed enlargement with an invagination where the edge of the prosthesis fits, the patient has worn the prosthesis for 15 years. EVOLUTION: Resection with scalpel (conventional technique) was performed. The histopathological examination reported inflammatory fibrous hyperplasia and a new total removable bimaxillary prosthesis was made for the patient. CONCLUSIONS: HFI is one of the main oral lesions in older adults denture wearers and it causes aesthetic and functional alterations; it is produced by the constant irritation caused by the settlement of the prosthesis borders on the mucovestibular sulcus as a consequence of alveolar resorption. Treatment is meant to eliminate the injury and its etiology; the absence of lesions on the mucosa and the bottom of the sulcus is completely necessary.

BACKGROUND: The set of pathological changes in the stomatognathic system in the presence of a total maxillary prosthesis and a removable partial mandibular prosthesis has been described as the Combi-nation Syndrome. The main purpose of this study was to determine its prevalence and if features such as age, sex or type of mandibular edentulism are associated with the syndrome in the patients of the Odon-tologic Clinic of the of Faculty of Dentistry, Universidad de Cuenca during the academic period 2015-2016. METhODS: Cuantitative, cross sectional descriptive and correlational study. The sample consisted of 312 edentulous patients. The diagnosis of the syndrome in this study was determined by the presence of a minimum of three associated signs. We determine the prevalence of combiantion syndrome and the association between sex, age and edentulism type and combination syndrome. RESUlTS: The prevalence of combination syndrome is 21.8%. Adults 60 years or older (1.8 times higher probability) and patients who suffer from Kennedy class I partial edentulism (3.6 times higher probability than other types of edentulism), have a higher probability for developing the syndrome. CONClUSiON: The prevalence of CS was 21.8%, age and suffering from Kennedy class I partial edentulism should be considered as risk factors for developing the syndrome. KEYWORDS: PARTIAL DENTURE, COMPLETE DENTURE, PREVALENCE, EDENTULOUS JAW.