Due to the high biotolerance, favourable mechanical properties, and osseointegration ability, titanium is the basic biomaterial used in maxillofacial surgery. The passive layer of titanium dioxide on the surface of the implant effectively provides anticorrosive properties, but it can be damaged, resulting in the release of titanium ions to the surrounding tissues. The aim of our work was to evaluate the influence of Ti6Al4V titanium alloy on redox balance and oxidative damage in the periosteum surrounding the titanium miniplates and screws as well as in plasma and erythrocytes of patients with mandibular fractures. The study included 31 previously implanted patients (aged 21–29) treated for mandibular fractures and 31 healthy controls. We have demonstrated increased activity/concentration of antioxidants both in the mandibular periosteum and plasma/erythrocytes of patients with titanium mandibular fixations. However, increased concentrations of the products of oxidative protein and lipid modifications were only observed in the periosteum of the study group patients. The correlation between the products of oxidative modification of the mandible and antioxidants in plasma/erythrocytes suggests a relationship between the increase of oxidative damage at the implantation site and central redox disorders in patients with titanium miniplates and screws.

Introduction: Nutrition is one of the most essential factors conditioning normal human growth and development. Nutritional errors can be the basis for the emergence and development of obesity, hypertension, atherosclerosis, osteoporosis or postural defects. Purpose: The study aimed to learn about the dietary habits of urban high-school youth. Materials and methods: The study was conducted using the original questionnaire in 2013 and covered 200 students of randomly selected high schools. Results: Among the subjects, 70.8% consumed 4 or 5 meals during the day. The boys have eaten five meals significantly more often during the day than girls. The first breakfast was consumed by 76.5% of students and the second breakfast with 69.7%. Of the subjects, 80% indicated the eating between meals. The girls preferred sweets, fruit, and sandwiches, and the boys had sandwiches, sweets, and dairy drinks. The highest percentage of the examined youth ate sweets 3-4 times a week (41.6% girls and 35.6% boys). The respondents who consumed fast food once a week constituted of 60.9% of girls and 48.7% of boys. The girls consumed sweetened drinks most often once a week, and boys 3-4 times a week. Conclusions: Nutritional errors of adolescents consisted of irregular consumption of meals, late time of the last meal before bedtime, consumption of a large number of sweet and spicy snacks and sweetened beverages were found. Wrong nutrition concerned both girls and boys