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Objective: To explore the occupational protective effect of different protective devices on the operators during manual cleaning and oiling of dental handpieces, and to provide a basis for the selection of appropriate protective methods. Methods: From November 2020 to December 2021, 20 high-speed dental handpieces of the same brand were selected and randomly divided into disposable protective bag group and small aerosol safety cabinet group by drawing lots, with 10 in each group. After recording the model, they were distributed to the clinical fixed consulting room for use, and were collected by specially-assigned personnel every day for manual cleaning under the protection of the two devices. By measuring the number of airborne colonies, the concentrations of particulate matter and the satisfaction of operators, the occupational protection effect of the two protective devices on operators was evaluated. Results: Under the protection of the two devices, the average number of airborne colonies after operation was less than 1 CFU/ml. When no protective device was used, the number concentration of particulate matter produced during operation was (21595.70±8164.26) pieces/cm(3). The number concentrations of particles produced by disposable protective bag group [ (6800.24±515.05) pieces/cm(3)] and small aerosol safety cabinet group [ (5797.15±790.50) pieces/cm(3)] were significantly lower than those without any protective device (P<0.001). The number concentration of particle matter of small aerosol safety cabinet group was significantly lower than that of disposable protective bag group (P<0.001). In the satisfaction evaluation of operators, small aerosol safety cabinet group [ (3.53±0.82) points] was significantly better than disposable protective bag group [ (2.23±1.10) points] (P<0.001) . Conclusion: The use of small aerosol safety cabinet during manual cleaning and oiling of dental handpieces has good protective effect, superior safety performance and strong clinical applicability, and has advantages in occupational protection of clinical operators.
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Aerosols , Particulate Matter , Protective DevicesABSTRACT
Objective To explore the application of high-speed dental handpiece and original luxator in the impacted wisdom tooth extraction. Methods Seventy patients with impacted wisdom teeth, who underwent impacted wisdom tooth extraction between Dec. 2016 and Dec. 2017, were selected. The patients were divided into control group (n=35) and minimally invasive group (n=35) according to the surgical options. The patients in the control group received conventional tooth extraction, and the patients in the minimally invasive group received tooth extraction using high-speed dental handpiece and original luxator. The surgical parameters (extraction integrity, mouth restriction, swelling and operation time), pain extent, complications and the quality of life after operation (psychological function, physiological function, physical pain, vitality) were compared between the two groups. Results The surgical parameters, including extraction integrity, mouth restriction, swelling and operation time, were significantly better in the minimally invasive group than those in the control group (all P0.05). After extraction, the VAS score was significantly lower in the minimally invasive group than that in the control group (P<0.05). The incidence of complications in the minimally invasive group was 11.43% (4/35), which was significantly lower than that in the control group (34.29% [12/35], P<0.05). At 3 months after extraction, the scores of psychological function and the other quality of life scores were significantly higher in the minimally invasive group than those in the control group (all P<0.05). Conclusion Application of high-speed dental handpiece and original luxator in impacted wisdom tooth extraction can significantly improve the treatment efficacy and reduce complication incidence.
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Objective To compare drying methods for dental handpiece,and to provide references and guidance for choosing appropriate handpiece drying methods.Methods Four groups were established according to different methods of drying:vacuum drying,compressed air dryer drying,entire automatic hot cleaner drying,and sterilizing machine drying.Four types (with 50 in each type)of handpieces with the same brand were selected:low-speed straight (EX-6C),low-speed bender (NAC-EC),high speed turbine fast handset,and high speed turbine four hole handset.After cleaning and disinfection,each handpiece was subjected to the aforementioned four drying methods,and the mass was recorded before and after drying.SPSS software was used to calculate and compare the drying rate among these drying methods by analysis of variance.Results There were significant differences in the drying rate among four drying methods(P＜0.01).The drying efficiency with vacuum drying was higher than the other three methods.The mean drying efficiency for four types of dentistry handset with vacuum drying method were as follows:low-speed straight(EX-6C)69.93％,low-speed bender(NAC-EC)93.21％,high speed turbine fast handset 92.70％,and high speed turbine four hole handset 94.27％.Conclusion The drying efficiency of vacuum drying method for handset is superior to the other three drying methods.
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Objective To explore the cleaning status and cleaning quality of dental handpieces in various types of medical institutions in Suzhou City.Methods On October 26-31, 2015, dental clinics in the whole city were sampled according to cross-sectional survey and proportional sampling method, the cleaning quality of dental handpieces in each clinic was detected by ATP bioluminescence assay.Results 72 medical institutions, 201 handpieces, 402 samples in 10 administrative regions of the city were sampled, 42 samples was unqualified, unqualified rate was 10.45％, unqualified rate of cleaning of dental handpiece surface was higher than waterline of dental handpiece(17.91％ vs 2.99％, P<0.05).Cleaning quality of dental handpieces in different grades of medical institutions was different(P<0.05), tertiary medical institutions were all ualified, medical institutions without grade was 14.45％.According to the classification based on name of different medical institutions, cleaning quality of handpieces was statistically significant(P<0.05), cleaning efficacy of dental handpieces in department of stomatology of public hospitals was best(unqualified rate was 4.31％), while private dental clinics had the worst cleaning efficacy(unqualified rate was 13.81％).Conclusion Education and training of dental handpieces cleaning in the whole city should be strengthened, especially the management of cleaning of dental handpieces in low grade and private dental clinics.
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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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Objetivos: Fue determinar el grado de conocimiento y el grado de actitud de los estudiantes de pre-grado de la Facultad de Estomatología de una universidad privada peruana, sobre la forma de esterilización de las piezas de mano dentales de alta y baja velocidad. Materiales y Métodos: Mediante una encuesta, se desarrolló un cuestionario de 24 preguntas que fue aplicada a un total de 144 estudiantes de tercer, cuarto y quinto año de dicha facultad que estuvieron estudiando los cursos de Clínica Integral del Adulto y Clínica Integral Pediátrica. El grado de conocimiento fue clasificado como alto, medio y bajo y el grado de actitud se clasificó como positivo, regular y negativo. Así mismo, se evaluó la relación entre el grado de conocimiento y actitud mediante la prueba de Chi cuadrado de Pearson. Resultados: El 43,8% de los estudiantes poseen un grado de conocimientos medio y el 61,8% mostró una actitud regular sobre la forma de esterilización de las piezas dentales de alta y baja velocidad. Conclusiones: No se encontró relación estadísticamente significativa entre el conocimiento y actitud de los estudiantes regulares; sin embargo, la relación entre la actitud y el llevar dos o más veces los cursos de clínica, si fue estadísticamente significativa.
Objectives: To determine the degree of knowledge and attitude of the students of the Faculty of Stomatology of a private peruvian university regarding the sterilization of high and low speed hand-pieces. Material and Methods: A questionnaire with 24 questions was applied to the students of third, fourth and fifth year who were taking the subjects of Integral Adult Clinic and Pediatric Clinic. The knowledge was classified as high, medium and low, and the attitude as positive, regular and negative. Chi-square test was used to evaluate the relation between knowledge and attitude. Results: 43.8% of the students had a medium level of knowledge, and 61.8% had a regular attitude regarding the sterilization of high and low hand-pieces. Conclusions: No statistically significance relationship between knowledge and attitude was found, however, the relationship between attitude and the fact if a student repeat a subject showed statistically significance.
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OBJECTIVE: The aim of this study was to investigate the ability of two NiTi rotary apical preparation techniques used with an electronic apex locator-integrated endodontic motor and a manual technique to create an apical stop at a predetermined level (0.5 mm short of the apical foramen) in teeth with disrupted apical constriction, and to evaluate microleakage following obturation in such prepared teeth. MATERIAL AND METHODS: 85 intact human mandibular permanent incisors with single root canal were accessed and the apical constriction was disrupted using a #25 K-file. The teeth were embedded in alginate and instrumented to #40 using rotary Lightspeed or S-Apex techniques or stainless-steel K-files. Distance between the apical foramen and the created apical stop was measured to an accuracy of 0.01 mm. In another set of instrumented teeth, root canals were obturated using gutta-percha and sealer, and leakage was tested at 1 week and 3 months using a fluid filtration device. RESULTS: All techniques performed slightly short of the predetermined level. Closest preparation to the predetermined level was with the manual technique and the farthest was with S-Apex. A significant difference was found between the performances of these two techniques (p<0.05). Lightspeed ranked in between. Leakage was similar for all techniques at either period. However, all groups leaked significantly more at 3 months compared to 1 week (p<0.05). CONCLUSIONS: Despite statistically significant differences found among the techniques, deviations from the predetermined level were small and clinically acceptable for all techniques. Leakage following obturation was comparable in all groups.
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Humans , Dental Instruments , Dental Leakage , Odontometry/instrumentation , Root Canal Obturation/instrumentation , Root Canal Preparation/instrumentation , Tooth Apex/anatomy & histology , Dental Alloys , Equipment Design , Materials Testing , Nickel , Reproducibility of Results , Root Canal Filling Materials/chemistry , Root Canal Obturation/methods , Root Canal Preparation/methods , Stainless Steel , Time Factors , TitaniumABSTRACT
OBJECTIVE To observe the effect of flushing dental handpieces to prevent suction-induced contamination and to lower the bacterial level in dental unit waterlines,and then to analyze the time-effect relationship of flushing.METHODS Twelve BienAir handpieces(group A) and 12 W&H TA-96 handpieces(group B) were employed in this study.The water samples from each handpiece′s outlet were immediately taken once when operations of de-caries,cavity-preparing and dental-drilling had been completed,and then taken once per 0.5 min while the handpieces were being flushed by running without work for 4 min.The bacterial colony formation of these water samples was counted on R2A agar plates.Colony forming units vs flushing time were then compared.RESULTS Alike in groups A and B,water bacterial levels were lowered the most significantly while flushing the handpieces for 0.5 min.BienAir or W&H TA-96 handpieces still showed decreased levels of water bacteria when being flushed for 3 or 2.5 min respectively.Afterwards,the flushing effect reached to a platform,that was,more flushing time didn′t bring the bacterial level down further.CONCLUSIONS Flushing handpieces by running without work can significantly reduce the level of bacterial contamination in the waterlines.Different types of handpieces may have different flushing time at which the most effect is reached.
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OBJECTIVE To provide an effective management mode of antisepsis for dental handpiece in dental(hospital) where a system called "one handpiece for one patient" is supposed to be found.METHODS Development and(running) mode of Antisepsis Center for Dental Handpiece were reviewed and function of the Center was(evaluated).(RESULTS) It was found that working process in the outpatient department could be simplified and much labor saved by maintain,antisepsis and refixation for dental handpiece in a wholesale mode.Furthermore,working efficiency and financial benefit of the dental hospital be greatly improved in this mode.CONCLUSIONS Antiseptic quality for dental handpiece is guaranteed by a standardized and programmed sterilization process in the Antisepsis Center for Dental(Handpiece).Management for handpiece in a wholesale mode is quite practicable and scientific.