Objective To develop an automated system that can accurately determine the relationship between the mandibular third molar and the mandibular nerve canal from panoramic images.Methods A dataset consisting of 600 panoramic images of the oral cavi-ty was selected,and the positions of the mandibular third molar and the mandibular nerve canal were accurately labeled.We compared the research designed TI-YOLOv5 with PANet,Faster R-CNN,Mask R-CNN,ResNeSt-101,and the original YOLOv5 in image seg-mentation tasks,with evaluation metrics of AP and AP50.Results TI-YOLOv5 achieved AP(average precision)54.0％and AP5094.9％,an increase of 4.9 and 6.7 percentage points respectively compared to the original YOLOv5(AP 49.1％,AP50 88.2％),and surpassed other SOTA methods such as Mask R-CNN(AP 45.1％,AP50 84.2％).Conclusion TI-YOLOv5 is significantly superior to mainstream networks in automatic positioning and relationship classification of mandibular wisdom teeth and neural tubes,with high de-tection accuracy and discrimination accuracy,and can provide reliable technical support for preoperative risk assessment of mandibular wisdom tooth extraction.

Objective To develop an automated system that can accurately determine the relationship between the mandibular third molar and the mandibular nerve canal from panoramic images.Methods A dataset consisting of 600 panoramic images of the oral cavi-ty was selected,and the positions of the mandibular third molar and the mandibular nerve canal were accurately labeled.We compared the research designed TI-YOLOv5 with PANet,Faster R-CNN,Mask R-CNN,ResNeSt-101,and the original YOLOv5 in image seg-mentation tasks,with evaluation metrics of AP and AP50.Results TI-YOLOv5 achieved AP(average precision)54.0％and AP5094.9％,an increase of 4.9 and 6.7 percentage points respectively compared to the original YOLOv5(AP 49.1％,AP50 88.2％),and surpassed other SOTA methods such as Mask R-CNN(AP 45.1％,AP50 84.2％).Conclusion TI-YOLOv5 is significantly superior to mainstream networks in automatic positioning and relationship classification of mandibular wisdom teeth and neural tubes,with high de-tection accuracy and discrimination accuracy,and can provide reliable technical support for preoperative risk assessment of mandibular wisdom tooth extraction.

Objective? To explore the disinfection effects of Cavi wipes and chlorine containing disinfectant on object surface touched frequently among multidrug resistance infection patients in intensive care unit. Methods? We selected 40 multidrug resistance infection patients with mechanical ventilation in general intensive care unit (GICU) and respiratory intensive care unit (RICU) at Liangxiang Hospital in Fangshan District from June 2016 to May 2018 by convenience sampling. All of the patients were randomly divided into control group (object surface disinfection by 500 mg/L chlorine containing disinfectant) and experimental group (object surface disinfection by Cavi wipes). We carried out sampling and bacterial culture in object surface touched by patients frequently both groups (right bed handrail, ventilator panel parameter key and infusion pump on/off key) before, 5 minutes, 6 hours and 8 hours after disinfection and monitored the target drug-resistance bacteria. Results? Before disinfection, there were no statistical differences in the bacterial culture results of object surface touched frequently in patients between two groups (P＞ 0.05). After disinfection, the bacterial colony counting of object surface touched frequently in patients between two groups was lower than that before with statistical differences (P＜0.01). The colony counting 8 hours after disinfection of experimental group were lower than those of control group with statistical differences (P＜0.05). Conclusions? Cavi wipes and 500 mg/L chlorine containing disinfectant all have good disinfection effects. Disinfection effects of Cavi wipes in bed and other object surface touched frequently are better than those of chlorine containing disinfectant which is convenient and is worthy of being widely used in clinical application.

The current situation of the CO2 laser treatment apparatus in hospital was evaluated through actual investigation and testing data in this paper. The existing problems have been analyzed and the solutions are proposed, which wil play a role in maintenance, testing and drafting standards for this kind of medical devices being used in hospital.

Grounding impedance measurement is a traditional proficiency testing programs, 2014 proficiency testing program on the basis of original ability to verify, combined with actual detection need, innovation introduced two verification point of the power input socket and metal plane testing. This paper analyzes and discusses the results of the ability verification in 2014, and puts forward the points of attention and the recommended method of metal plane test.
Laboratories ; standards ; Laboratory Proficiency Testing

Grounding impedance measurement is a traditional proficiency testing programs, 2014 proficiency testing program on the basis of original ability to verify, combined with actual detection need, innovation introduced two verification point of the power input socket and metal plane testing. This paper analyzes and discusses the results of the ability verification in 2014, and puts forward the points of attention and the recommended method of metal plane test.