ABSTRACT
<p><b>OBJECTIVE</b>To investigate whether periodontal infection is a risk factor for lower respiratory infection patients receiving oral and maxillofacial tumor surgery.</p><p><b>METHODS</b>Patients undergoing oral and maxillofacial surgery for tumors with concurrent periodontal disease between January, 2012 and December, 2016 were randomized into periodontal intervention group and control group (treated with gargle solution containing chlorhexidine gluconate). The one-time periodontal intervention was completed within 24 h in the intervention group and two-week mouthwash was prescribed in the control group before oral and maxillofacial tumor surgery. Five periodontal indexes were examined at baseline and at 6 weeks after the treatment. The clinical symptoms and incidence of lower respiratory infections were compared between the two groups at 6 weeks.</p><p><b>RESULTS</b>The PLI, BOP, PPD, and CAL were significantly lower and GR was higher in the intervention group than in the control group (P<0.01). The periodontal status was significantly improved in the intervention group. The incidence of lower respiratory infection was significantly lower in the intervention group than in the control group (2.22% vs 7.11%, P<0.01). The incidences of cough and expectoration in the intervention group were significantly lower than those in control group (P<0.01).</p><p><b>CONCLUSIONS</b>Periodontal infection is one of the risk factors for lower respiratory infection after oral and maxillofacial tumor surgery. The periodontal status can be effectively controlled and improved by periodontal intervention. Compared with mouthwash, periodontal intervention can significantly reduce the incidences of cough and expectoration and lower the incidence of lower respiratory infections.</p>