Clinical Observation on the Disinfection of Turbine Water System to Minimize Postoperative Complications of Minimally Invasive Tooth Extraction

With the development of minimally invasive tooth extraction, the incidence rate of iatrogenic cross infection is increasing. Hence, the present study was carried out in order to a) develop a new, feasible disinfection strategy to be used in high-speed turbine and 3-function sprayer water systems and b) assess the clinical significance of newly developed disinfection strategy. A total of 178 patients who had minimally invasive tooth extraction in Stomatological Hospital of Xuzhou, China from June 2013 to 2014 were selected prospectively. The patients were divided into two groups namely control and observation each consisted of 89 patients. The sterile distilled water was used in control whereas mixture of 0.5% chlorhexidine and 95% ethanol was used in observation group to rinse turbine water system during tooth extraction. This study was approved by Ethics Committee of the hospital and informed consent was obtained from patients or their family members. Lidocaine was used as local anaesthetic and a specialized turbine drill, which was disinfected as described (1) before use. In brief, about 6 ml of disinfectant solution (0.5% chlorhexidine and 95% ethanol) was poured into the water storage tanks of turbines (YK-4A high-speed turbine dental engine , Beijing Surgical Instrument Factory, No.691). Water storage tanks were shaken so that the disinfectant could bestrew the inside. The same procedure described above was adopted for patients of control group, but instead of disinfectant sterile distilled water was used. In total, 6 ml of liquid from three discharges each with 2 ml were collected in a sterile tube. Then, they were serially diluted in 0.9% NaCl and cultured on nutrient agar. VITEK automatic microbial identification system was used to identify the microorganisms grown on the nutrient agar. The results were analyzed by SPSS 19.0