No clinical activity is carried out on Saturday and Sunday.Almost all the injuries happened from 9.00AM to 13.00AM (95%), divided into equal numbers from 9.00AM to 11.00AM (n = 29) and from NSC 125973 11.00 AM to 13.00 AM (n = 31).The highest number of injuries was clinical (45 of 63, 71 %), 18 (29%) were not clinical and took place prevalently during instrument setting (12 of 18, 67%), only one was in laboratory and during cleaning procedures (0.05%) and 4 during other activities (22%).As for the relationship between activity and type of operator, the 33% of the clinical injuries involves students and such percentage goes up to 50% for the clinical injuries (chi-square = 66.91, p = 0.0001). The instrument more frequently connected to the accident was the needle for local anaesthesia (23 of 63, 36.

5%) (Figure 3).Figure 3Instruments causing accidents, as percentages.No statistically significant association was observed between the instrument involved and professional profile of operator or type of activity.The injuries involved the hands for 78%, 11% the eyes and 2% the head (Table 1); no significant differences appears among right- and left-hand sites.Table 1Parts of body affected by accident.A significant association is observed between the cause of injury and the part of body involved (p = 0.0001); right thumb is injured by carpule (23%), the other fingers of the right hand by carpule (31%) and curette or scalpel blade (50%), the eyes by blood or noun (100%), and the left thumb by peripress needle (29%).

Since 2002, date of its institution, endodontic division presented the highest number of injuries (15 of 62, 24%), respectively followed by the teaching section (12 of 62, 19%), periodontology and implantology (11 of 62, 18%), oral surgery (10 of 62, 16%), and microbiology and other services (both 1 of 62, 2%). No significant association was found between section and number of injuries or instruments involved. The 22% of patients involved in the injury event, regularly submitted to a serologic examination, resulted positive to HVB or HVC Anacetrapib or HIV (1 HBV positive, 10 HCV positives, and 3 HIV positives); however no seroconversion happened within 6 months from the injury neither in students nor in staff.4. DiscussionWithin the DS all the laws that rule the health departments for the prevention of occupational injuries were activated [2]. Particularly guidelines aimed to avoid needle or sharp instrument or contamination injury occurring during patient treatment or instrument reordering were adopted. [8, 9].Faculty and staff members are instructed to follow the security guidelines in workplace; also the students follow specific lessons before the beginning of the clinical activity.