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BACKGROUND: The preparation and cleaning of severely curved root canal is the difficult point of root canal treatment. A large number of smear layer will be produced in the process of root canal preparation. Removing effectively these debris and smear layer will be conducive to improving the success rate and longterm effect of severely curved root canal treatment. OBJECTIVE: To explore the cleaning efficacy of Twisted File and ProTaper file combined with chemical preparation on smear layer of severely curved root canal by scanning electron microscope. METHODS: Twenty clinically extracted mandibular molars with severely curved root canals were collected and randomly divided into two groups: Twisted File group and ProTaper group. The root canals were prepared by Twisted file and ProTaper Ni-Ti file, respectively. They were prepared by chemical method with 3% NaClO and 17% EDTA. After preparation, the root canals were split longitudinally and the cleaning efficacy of smear layer of coronal, middle and apical thirds was observed by scanning electron microscope. RESULTS AND CONCLUSION: (1) The images of scanning electron microscope showed that the dentinal tubules of root canal coronal thirds in the ProTaper group and Twisted file group were completely open, almost without smear layer. Dentinal tubules of middle thirds were also open, and simply part of them were covered by smear layer. However, dentinal tubules of apical thirds had few and no obvious opening, and was covered by a large number of smear layer. (2) In Twisted file group, the scores of smear layer at root canal apical thirds were higher than coronal and middle thirds (P 0.05). (3) The results showed that the chemo-mechanical preparation with Twisted File and ProTaper could remove effectively the debris and smear layer in the root canal walls of coronal and middle thirds of the severely curved crown, but the removal effect on apical thirds and dentin tubules was not good.
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Objective To understand the cleaning quality of dental handpieces in Suzhou City, analyze the relevant factors that influencing cleaning effect.Methods A cross-sectional study was performed with the proportional system sampling method, questionnaires were adopted to investigate the cleaning location, cleaning method and process of dental handpieces, the ATP fluorescence detection method was conducted to detect cleaning quality.Results In 10 administrative regions of this city, a total of 72 medical institutions were selected, 25 were public medical oral diagnosis and treatment institutions, 47 were private clinics.Cleaning effect of automatic handpiece cleaning machine was better than traditional manual cleaning (unqualified rate :3.95% vs 11.96%, P0.05).The quality of cleaning of handpieces could be improved if waiting time of cleaning ≤30 minutes, enzymes were used during cleaning, and purified water was used at the end rinse(all P<0.05);whether there was drying process and used lubricant, difference were both not significant.Conclusion Using automatic handpiece cleaning machine, cleaning personnel with adequate knowledge, cleaning waiting time ≤30 minutes, enzyme use during the cleaning process, and purified water use at the end rinse can improve the quality of cleaning of dental handpieces.
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Objective To compare the cleaning effect of before and after improvement of P′750 type endoscopic infusion pump sensing infusion. Methods 240 cases of urinary calculi patients were divided into experimental group (120 cases) and control group (120 cases) according to the random number table method. Experimental group made improvements on P′750 type endoscopic infusion pump sensing infusion, Took latex transmission pipe, sampling module, metal fittings and parenteral nutrition infusion bags, disposable connecting pipe connection, and surgery using improved sensing infusion. The control group used unimproved sensing infusion. Results Visual inspection of cleaning pass rate before and after improvement sensing infusion were 85.83% (103/120), 99.17% (119/120), 5 times with light magnifier inspection were 78.33%(94/120), 97.50% (117/120), tampons method inspection were 75.83% (91/120), 95.83% (115/120), ATP bioluminescence monitoring were 70.83% (85/120), 91.67% (110/120), dry pass rate were 90.83%(109/120), 100.00% (120/120), cleaning and drying pass rate were significantly improved (χ2=18.296, 29.159, 32.986, 40.976, 11.528, all P<0.01). Cleaning time before and after improvement sensing infusion were (1 020.40±8.22) s, (539.30±8.70) s. Dry time were (1 199.35±26.70) s, (61.50±5.79) s. Cleaning and drying time were significantly shortened (t=440.340, 456.206, all P<0.01). Conclusion Improvement sensing infusion increased the quality of cleaning and drying, shortened the cleaning and drying time, ensured the quality of surgery using equipment, improved work efficiency, and provided a guarantee for the safe and smooth implementation of the surgery.
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Objective To observe the urine analysis test paper evaluation method for the determination of the sensitivity of medical equipment cleaning effect,for cleaning quality evaluation method.Methods To perform standard manual processing equipment in the experiments,the first use of ATP monitoring method and the analysis of urine test paper test mid experiment data,calculate its whether there is relationship and ATP test method,and can instruct the cleaning quality results;Second use visual method,ATP bioluminescence method and the analysis of urine test paper test the end of the experiment data,the analysis to determine the urine test paper measurement indicator cleaning qualified evaluation threshold.Results The ATP test paper method and urine analysis had showed positive correlation,0.30 ≤r≤0.75,and to complete the standard cleaning process 300 pieces of department of gynaecology attractor visual analysis method,ATP bioluminescence method and the analysis of urine test paper measurement inspection group (the -),cleaning the percent of pass was 95.67％(287/300),86.33％(259/300) and 83.37％(251/300) respectively,therefore,urine analysis test paper assay to detect the - was the cleaning threshold quality qualification evaluation,urine analysis test paper test the percent of pass was 14.46％ lower than the visual observation,x2=63.35,P＜0.05.Conclusions Urine analysis test paper test results,test method is simple,low cost,and can be widely used in medical equipment cleaning quality evaluation method of semi-quantitative daily monitoring.
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Objective:To me affiliated hospitals are currently using Shimadzu CL8000 Hitachi 7180 automatic biochemical analyzer comparison study on Shimadzu CL8000 Hitachi 7180 automatic biochemical analyzer cleaning effect for clinical obtain accurate test results provide a reliable basis. Methods:Patients with the same blood samples TG, TBA testing, using different instruments, different sequence of tests in order to determine Hitachi 7180 automatic biochemical analyzer and Shimadzu CL8000 automatic biochemical analyzer test results whether they carry the previous reagents, according to the detection results to determine two kinds of automatic biochemical analyzer after cleaning effect. Results:A group of TBA measurements were significantly higher than in group B, C group, D group(x2=4.091, P<0.05), comparing the results with statistical significance;B group, C group, D group compared TBA measurements no significant difference, the difference was not statistically significant. Conclusion:Shimadzu CL8000 automatic biochemical analyzer cleaning better than Hitachi 7180 automatic biochemical analyzer, its stable performance, excellent cleaning effect, clinicians can provide accurate diagnosis and treatment basis, improve patient outcomes, quality of life and protect their life safety, may be of clinical use.
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Objective As there are difficult problems in surgical puncture needle cleaning and cleaning effect monitoring,we are aiming at finding some reliable solutions through relevant comparative tests. Methods Lumbar puncture needle,bone puncture needle and anesthe-sia spinal needle after clinical use,80 of each kind,were randomly collected and equally divided into the experimental group and the control group. The control group was given traditional lumen surgical instruments cleaning procedure,and the experimental group was given newly cre-ated small lumen instruments manual cleaning procedures. Magnifying glass,self-made instruments monitoring and ATP bioluminescence mo-nitoring were respectively used to verify the cleaning effect. Results All needles were monitored with magnifying glass,self-made instruments monitoring and ATP bioluminescence monitoring after cleaning,and the qualified rate were 98. 33%,97. 00% and 93. 33% respectively in the experimental group while 95. 00%,83. 33% and 78. 33% respectively in the control group. Results of self-made instruments monitoring and ATP bioluminescence monitoring showed that there was no difference between the two kinds of detection methods. Conclusion Newly created small lumen instruments manual cleaning procedures and self-made instruments monitoring were of reliable effect and strong operabili-ty in terms of puncture needle cleaning and cleaning effect monitoring,and they were worthy of further research and application.
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OBJECTIVE To probe cleaning methods of reusable puncture needles and improve the quality of cleaning. METHODS The 200 sets of puncture needles with blood were divided into two groups (groups A and B). Ultrasonic cleaning was used in two groups,but in group A was with 3% hydrogen peroxide solution and in group B with 1∶150 low foam multi-enzyme cleaning liquid for 20 minutes,after rinsing,the group A used 95% ethanol 2 ml/piece for dry,but the Group B used 90 ℃ 30 min,and then the bacterial endo toxins and 3% hydrogen peroxide tests,the cost of cleaning was compared. RESULTS The positive rates of the bacterial endo toxins and 3% hydrogen peroxide test in group A were conducted,at last were 6% and 5%,while group B all were negative (?2=6.19,5.13,P
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OBJECTIVE To evaluate the medical instrument′s cleaning effect and bacterial elimination result by using multi-enzyme cleaning agent.METHODS The total 229 pieces of moderate contaminated medical instrument were randomly divided into 2 groups:control group and experiment group.The effects after routine water immersion and processing of multi-enzyme cleaning(including hand cleaning and machineone were observed and the bacteriological examination in the sample was checked.RESULTS 96% of the medical instruments in experiment group were cleaned,while only 35% of them in control group were cleaned.It was showed the cleaning effect of multi-enzyme was better than routine water immersion.In the experiment group,the contaminated rates of blood pincers and tweezers after hand cleaning with multi-enzyme were 33.7% and 25.5%,respectively,while the contaminated rates of blood pincers and tweezers after machine cleaning with multi-enzyme were 0.It indicated that the bacterial eliminate rate of machine cleaning with multi-enzyme was higher than hand cleaning with multi-enzyme.CONCLUSIONS Multi-enzyme agents are better for medical instrument cleaning.
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OBJECTIVE：To test and verify the piping cleaning effect in infusion solution productive process.METHODS:Targets of final washing water of pipe were determined.RESULTS:Targets of final washing water of pipe were that electrical conductivity of entrance of pipe was equal to that of exit of pipe essentially,limitation of bacteria and endotoxin were as follows:＜50CFU/ml,＜0.25EU/ml.CONCLUSIONS:According to the clean rules laid down by pharmaceutical Factory of Shanquan,Jinan,The desired cleaning effect of the pipe of infusion solution can be achieved.
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Objective To know the air supply quality of central air-conditioning ventilation system in building before and after cleaning.Methods Three sets of central air-conditioning ventilation systems were selected from a building randomly and 3 air supply ways were selected in each system for the determination of inhalable particulate matter(PM10) and microorganisms in air before and after cleaning.Results After cleaning,the unqualified rate of air quality increased from 11.1%(before cleaning) to 77.8%.The mean value of PM10 increased from 0.051 mg/m3(before cleaning) to 0.083 mg/m3,the median of total account of bacteria and fungus increased from 150 cfu/m3 and 13 cfu/m2(before cleaning) to 570 cfu/m3 and 110 cfu/m3 respectively.Conclusion The air supply quality of central air-conditioning ventilation system in building may be damaged by cleaning if the operation is not in the right way.