Aim: The aim of the study was to identify the consequences of the use of fixed otrhodontic appliances (FOAs) on the morphological state of the tissues of the lower wall of the maxillary sinus, depending on the duration of their use.
Materials And Methods: The study involved 115 male and female patients aged 18 to 25 years. All patients were divided into 2 research groups depending on the period of wearing brace systems.