Objective：The aim of the study was to explore most effective way to control infection during implant treatment. Methods: The study was carried out in two implant operating surgeries (Surgery A, Surgery B), which were set up air disinfectant machine and ultraviolet disinfection respectively. For baseline measurements, the number of bacterials in the air of the two surgeries was counted at 5min, 15min, 30min, 45min and 60min before sanitizing. To compare sanitizing effect of static air disinfection, air samples from these surgeries were collected for bacterial cultivation after sanitizing for 5min, 15min, 30min, 45min and 60min, and the the sterilization rate was calculated. To compare dynamic air disinfection, the two surgeries were sterilized before implant surgery, and the air samples were collected at 5min, 15min, 30min, 45min, 60min after implant operation. Results: There were no significant differences between air disinfectant machine and ultraviolet disinfection in static air disinfection (p<0.05). However, air disinfectant machine was more effective in dynamic air disinfection. Conclusion：Air disinfectant machine is the most effective way for the prevention of nosocomial infections.

Objective:The aim of the article was to systematically evaluate a novel bone collector designed by authors for intraoral harvesting.Method: An electronic combined with a hand literature search was conducted and comparative analysis was performed focusing on the principle,quantity,decontamination and cost between author-designed collector and the one recommended in literature.Result: The collectors recommended in literature all are based on filter principle and contain different size of sieve for collecting bone debris which have the disadvantage of lower bone volumes,suction blocking easily and particularly susceptible to oral microbial contamination.While the bone collector designed by authors is based on dynamics principle and centrifugal separation principle and appeares to be higher efficient,effective decontamination in bone collection and low cost. Conclusion: The principle of the bone collector designed by authors was innovative and will have good application in ordinary native dental clinic for providing efficient osteogenesis,less trauma and less cost.

Objective The present study aimed to introduce the manufracture process of the suction tube special for the Piezoelectric surgery and explore its effect in the surgical extraction of impacted lower third molars. Methods The sample consisted of 114 patients undergoing surgical third molar removal. The special suction tube was periodically used during the whole process of Piezoelectric surgery. Results The suction tube can quickly clear the mouth, essentially vacuuming up the excess liquid, splatter particles and aerosol away from the area of concern, offering a clear surgical field for the dentists. Meanwhile, the tube can be used as a retractor to raise the mucoperiosteum flap, to expose the operation field more clearly. Conclusion The suction tube special for the Piezoelectric surgery can be a simple and practical tool for the Piezoelectric surgery.

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Cone beam computed tomography （CBCT） is an exciting development in dental and maxillofacial imaging. This article gives an report for evaluation the direction of dental implant in immediate implant using CBCT