scholarly journals Effect of the Lubrication on the Autoclaving of the Dental Air-Turbine Hand-Piece

2014 ◽  
Vol 84 (6) ◽  
pp. 621-628
Author(s):  
Kaoru Tamazawa ◽  
Yoshinori Tamazawa ◽  
Hidetoshi Shimauchi
Keyword(s):  
Air Turbine ◽  
Hand Piece

scholarly journals Vibration Exposure and Transmissibility on Dentist’s Anatomy: A Study of Micro Motors and Air-Turbines

2021 ◽  
Vol 18 (8) ◽  
pp. 4084
Author(s):  
Harish Kumar Banga ◽  
Pankaj Goel ◽  
Raman Kumar ◽  
Vikas Kumar ◽  
Parveen Kalra ◽  
...  
Keyword(s):  
Research Work ◽  
High Amplitude ◽  
Vibration Exposure ◽  
Body Parts ◽  
Descriptive Research ◽  
Air Turbine ◽  
Test Of Homogeneity ◽  
Hand Piece ◽  
Vibration Transmissibility ◽  
Levene Test

The use of dental hand pieces endanger dentists to vibration exposure as they are subjected to very high amplitude and vibration frequency. This paper has envisaged a comparative analysis of vibration amplitudes and transmissibility during idling and drilling with micro motor (MM) and air-turbine (AT) hand pieces. The study aims to identify the mean difference in vibration amplitudes during idling, explore different grasp forces while drilling with irrigant injection by the dentist, and various vibration transmission of these hand pieces. The study utilized 22 separate frequency resonances on two new and eight used MMs and two new and eight used ATs of different brands by observing the investigator at 16 different dentist clinics. The study adopted a descriptive research design with non–probability sampling techniques for selecting dentists and hand pieces. Statistical methods like Levene Test of Homogeneity, Welch ANOVA, independent t-test, and Games–Howell test were utilized with SPSS version 22 and MS-Excel. The results reveal that vibration amplitudes and vibration transmissibility when measured at position 2 are higher than in another position 1. Vibrations during idling for used MMs are more than AT hand pieces, and the used MM (MUD) and used AT (AUA) hand pieces differ due to their obsolescence and over-usage. Vibration amplitudes increase every time with the tightening of grasping of the hand piece. Vibration amplitudes for each grasping style of MM hand piece differ from all other grasping styles of AT hand pieces. Routine exposure to consistent vibrations has ill physical, mental, and psychological effects on dentists. The used hand pieces more hazardous as compared to newer ones. The study suggests that these hand pieces must be replaced periodically, sufficient to break between two operations, especially after every hand piece usage. Hence, the present research work can be further extended by creating some control groups among dentists and then studying the vibration amplitude exposure of various dental hand pieces and subsequent transmissibility to their body parts.

scholarly journals Dental mitigation strategies to reduce aerosolization of SARS-CoV-2

2021 ◽  
Author(s):  
Jon J Vernon ◽  
Emma V.I. Black ◽  
Thomas Dennis ◽  
Deirdre A Devine ◽  
Louise Fletcher ◽  
...  
Keyword(s):  
Pseudomonas Syringae ◽  
Artificial Saliva ◽  
High Volume ◽  
Mitigation Strategies ◽  
Particle Analysis ◽  
Worst Case ◽  
Dental Surgery ◽  
Rubber Dam ◽  
Air Turbine ◽  
Hand Piece

Limiting infection transmission is central to the safety of all in dentistry, particularly during the current SARS-CoV-2 pandemic. Aerosol-generating procedures (AGPs) are crucial to the practise of dentistry; it is imperative to understand the inherent risks of viral dispersion associated with AGPs and the efficacy of available mitigation strategies. In a dental surgery setting, crown preparation and root canal access procedures were performed with an air turbine or electric speed-controlled hand-piece, with mitigation via rubber dam or high-volume aspiration and a no mitigation control. A phantom head was used with a 1.5 mL flow of artificial saliva infected with Φ6 bacteriophage (a surrogate virus for SARS-CoV-2) at ~108 plaque forming units mL-1, reflecting the upper limits of reported salivary SARS-CoV-2 levels. Bioaerosol dispersal was measured using agar settle plates lawned with the bacteriophage's host, Pseudomonas syringae. Viral air concentrations were assessed using MicroBio MB2 air sampling, and particle quantities using Kanomax 3889 GEOα particle counters. Compared to an air turbine, the electric hand-piece reduced settled bioaerosols by 99.72%, 100.00% and 100.00% for no mitigation, aspiration and rubber dam, respectively. Bacteriophage concentrations in the air were reduced by 99.98%, 100.00% and 100.00%, with the same mitigation strategies. Use of the electric hand-piece with high-volume aspiration, resulted in no detectable bacteriophage, both on settle plates and in air samples taken 6-10-minutes post-procedure. To our knowledge, this study is the first to report the aerosolization of active virus as a marker for risk determination in the dental setting. Whilst this model represents a worst-case scenario for possible SARS-CoV-2 dispersal, these data showed that the use of electric hand-pieces can vastly reduce the risk of viral aerosolization, and therefore remove the need for clinic fallow time. Furthermore, our findings indicate that the use of particle analysis alone cannot provide sufficient insight to understand bioaerosol infection risk.

Development of an Electromagnetic Brake for Stabilizing the Ram Air Turbine Rotation Frequency

2020 ◽  
Vol 8 (8) ◽  
pp. 37-43
Author(s):  
Anton A. SHIROKOV ◽  
◽  
Dmitriy S. DEZHIN ◽  
Marina V. ZDOROVA ◽  
◽  
...  
Keyword(s):  
Rotation Frequency ◽  
Electromagnetic Brake ◽  
Air Turbine

scholarly journals Research on aerodynamic characteristics of two-stage axial micro air turbine spindle for small parts machining

2020 ◽  
Vol 12 (12) ◽  
pp. 168781402098437
Author(s):  
Liu Jiang ◽  
Guo Zhiping ◽  
Miao Shujing ◽  
He Xiangxin ◽  
Zhu Xinyu
Keyword(s):  
High Speed ◽  
Aerodynamic Characteristics ◽  
Maximum Efficiency ◽  
Two Stage ◽  
Output Torque ◽  
Air Turbine ◽  
Solid Foundation ◽  
Computational Fluid Dynamics Cfd ◽  
Micro Machine ◽  
Small Parts

In order to meet the requirements of output torque, efficiency and compact shape of micro-spindles for small parts machining, a two-stage axial micro air turbine spindle with an axial inlet and outlet is proposed. Based on the k-ω turbulence model of SST, the flow field and operation characteristics of the two-stage axial micro air turbine spindle were studied using computational fluid dynamics (CFD) combined with an experimental study. We obtained the air turbine spindle under different working conditions of the loss and torque characteristics. When the inlet pressure was 300 KPa, the output speed of the two-stage turbine was 100,000 rpm, 9% higher than that of a single-stage turbine output torque. The total torque reached 6.39 N·mm, and the maximum efficiency of the turbine and the spindle were 42.2% and 32.3%, respectively. Through the research on the innovative structure of the two-stage axial micro air turbine spindle, the overall performance of the principle prototype has been significantly improved and the problems of insufficient output torque and low working efficiency in high-speed micro-machining can be solved practically, which laid a solid foundation for improving the machining efficiency of small parts and reducing the size of micro machine tool.

scholarly journals Optimum Design of the Dental Air-Turbine Handpiece System Using the Design of Experiment Method

2020 ◽  
Vol 21 (2) ◽  
pp. 265-272 ◽  
Author(s):  
Makhsuda Juraeva ◽  
Dong Joo Song ◽  
Dong Jin Kang
Keyword(s):  
Optimum Design ◽  
Design Of Experiment ◽  
Air Turbine ◽  
Experiment Method

Failure Analysis of an Air Turbine Starter

2010 ◽  
Vol 10 (4) ◽  
pp. 259-263 ◽  
Author(s):  
Swati Biswas ◽  
M. D. Ganeshachar ◽  
B. R. Sridhar ◽  
S. Ramachandra
Keyword(s):  
Failure Analysis ◽  
Air Turbine

Observations on the use of the ultra high-speed air turbine handpiece

1959 ◽  
Vol 9 (2) ◽  
pp. 302-303 ◽  
Author(s):  
Robert W. Fischer
Keyword(s):  
High Speed ◽  
Ultra High Speed ◽  
Air Turbine

Basic study on vibrations of tooth preparations caused by air turbine, quintuple speed handpiece, and Er:YAG Laser

2003 ◽  
Vol 1248 ◽  
pp. 227-230 ◽  
Author(s):  
Kazunori Takamori ◽  
Hirohiko Furukawa ◽  
Tadashi Katayama ◽  
Shigeru Watanabe
Keyword(s):  
Er:Yag Laser ◽  
Basic Study ◽  
Air Turbine

scholarly journals High Speed Air Turbine of Small Capacity : Continued : the 1st

1952 ◽  
Vol 18 (67) ◽  
pp. 92-94
Author(s):  
Hiroshi AOKI
Keyword(s):  
High Speed ◽  
Air Turbine ◽  
Small Capacity
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