Abstract: Objective: To improve the cleaning and disinfection effect of dental bender, the handpiece disassembly cleaning method was applied in our hospital and the effect was observed. Methods: After periodontal scaling, NSK slow bending machine was randomly cleaned and detected 150 times per group. The patients were divided into the experimental group(manual+handpiece disassembly+ultrasonic cleaning group/manual+handpiece disassembly+thermal mechanical cleaning group) and the control group(manual+ultrasonic cleaning group). Results: There was no significant difference in the cleaning and disinfection effect between the two groups(P>0.05), and the cleaning and disinfection effect was significantly better than the control group(P<0.05). Conclusion: The slow bending machine for dentistry is a precision instrument with complicated structure.The application of manual initial washing, ultrasonic shock enzymatic washing/thermal mechanical cleaning, head assembly, oiling, curing, packaging and sterilization process after disassembly of the bending machine can get a satisfactory cleaning qualification rate of the bending machine, which is an ideal and effective method.

Key words: handpiece disassembly cleaning method, slow bending machine, cleaning quality