To evaluate whether dental treatment may enhance oral antisepsis, thus preventing more effectively lower respiratory tract infections (LRTIs) among critically ill patientsDesign.Observer-blind randomized clinical trial.

General intensive care unit (ICU) for adult patients.

We analyzed data from 254 adult patients who stayed for at least 48 hours in the ICU.

Patients were randomized by means of rolling dice. The experimental group (n = 127) had access to dental care provided by a dental surgeon, 4–5 times a week. Besides routine oral hygiene, care also included teeth brushing, tongue scraping, removal of calculus, atraumatic restorative treatment of caries, and tooth extraction. The control group (n = 127) had access to routine oral hygiene only, which included the use of chlorhexidine as a mouth rinse, which was performed by the ICU nurse staff.

The primary study outcome was the LRTI incidence, which was 8.7% in the experimental group and 18.1% in the control group (adjusted relative risk [RR], 0.44 [95% confidence interval (CI), 0.20–0.96]; P = .04). Ventilator-associated pneumonia rates per 1,000 ventilator-days were 16.5 (95% CI, 9.8–29.5) in the control group and 7.6 (95% CI, 3.3–15.0) in the experimental group (P < .05). Mortality rates were similar between both study groups: 31.5% in the control group versus 29.1% in the experimental group (adjusted RR, 0.93 [95% CI, 0.52–1.65]; P = .796). No severe adverse events related to oral care were observed during the study.

Dental treatment was safe and effective in the prevention of LRTI among critically ill patients who were expected to stay at least 48 hours in the ICU.

Brazilian Clinical Trials Registry, affiliated with the World Health Organization’s International Clinical Trial Registry Platform: U1111-1152-2671.Infect Control Hosp Epidemiol 2014;35(11):1342–1348