cavitation

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cavitation

 [kav″ĭ-ta´shun]
1. cavity.
2. the formation of cavities.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

cav·i·ta·tion

(kav'i-tā'shŭn),
1. Formation of a cavity, as in the lung in tuberculosis or with development of a bacterial lung abscess.
2. The production of small vapor-containing bubbles or cavities in a liquid or tissue by ultrasound.
Farlex Partner Medical Dictionary © Farlex 2012

cavitation

(kăv′ĭ-tā′shən)
n.
1. The sudden formation and collapse of low-pressure bubbles in liquids by means of mechanical forces, such as those resulting from rotation of a marine propeller.
2. The pitting of a solid surface.
3. Medicine The formation of cavities in a body tissue or an organ, especially those formed in the lung as a result of tuberculosis.

cav′i·tate′ v.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

cav·i·ta·tion

(kav-i-tā'shŭn)
1. Formation of a cavity, as in the lung in tuberculosis.
2. The production of small, vapor-containing bubbles or cavities in a liquid by ultrasound.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

cav·i·ta·tion

(kav-i-tā'shŭn)
1. Formation of tiny bubbles in water exiting tip of an electronic instrument; when collapsing, these bubbles produce bactericidal shock waves that act by tearing bacterial cell walls.
2. Formation of a cavity.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about cavitation

Q. What are the effects of alcoholism on the oral cavity? I have to make a presentation on this topic, and I would like to know what are the main pathological effects of chronic alcoholism on the oral cavity, I know that it is a carcinogen, but it mainly acts as a promoter, is there any cancer that is caused by alcohol abuse?

A. alcohol can interact harmfully with several medications commonly used in dental treatment. Alcohol intensifies the depressant effect of barbituates and tranquilizers creating a higher risk of deep sedation and unconsciousness. Following treatment, the ability to drive may be impaired. Medications used to control high blood pressure and angina have a dilating effect on the blood vessels which is intensified by alcohol.

The result is a higher likelihood of low blood pressure and fainting. Even the action of aspirin is intensified by alcohol, causing excessive bleeding by disrupting clot formation

Q. what happens if a dentist fills a cavity with some caries left on the tooth? the cavity was deep ,close to the nerve. Didn’t make nerve exposure.?

A. If it wasn’t removed properly – you will have what they call – “recurrent cries”. It’ll continue growing without you seeing it until you’ll come back to the dentist again because of the pain. I suggest you’ll save the pain part and go now.

Q. what happens if a dentist fills a cavity with some caries left on the tooth? the cavity was deep ,close to the nerve. Didn’t make nerve exposure.?

A. If that is so, then you will need to have him remove all the decay, the refill. If it is too close to the nerves then they may have to do a root canal. That means take out the filling, the tooth pulp and fill it up.

More discussions about cavitation
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References in periodicals archive ?
The center of top surface of the disk-shaped cavitator on head of supercavitating vehicle is taken as the origin of coordinate system.
Select various combinations of parameters from <r e [0.02620, 0.02973], k [member of] [7.387,14.325], namely, the region interwoven by stable, periodic, and divergent states; the sections of basins of attraction on [z.sub.0]-[[theta].sub.0] plane are shown in Figure 6 and basins of attraction are approximate to a parallelogram, when launching depth [z.sub.0] and launching pitch [[theta].sub.0] are selected from green region in the figure; the lift of cavitator and fin is equal to the weight of supercavitating vehicle, which make supercavitating vehicle move stably under the parameters.
Parameter Description Value g Acceleration of gravity 9.81 m/[s.sup.2] m Density ratio ([[rho].sub.m]/[rho]) 2 n Tail efficiency 0.5 [R.sub.n] Radius of cavitator 0.0191m R Radius of vehicle 0.0508 m L Length of vehicle 1.8 m [sigma] Cavitation number [0.01980,0.03680] [C.sub.x0] Coefficient of lift 0.82 Table 2: Coexisting attractors at different combinations of parameters.
For ventilated supercavitating vehicles, hydrodynamic forces only act on wetted parts including the cavitator, the partial hull surface (planing zones), and the vertical rudders.
Forces on Cavitator. The cavitator is employed as a head rudder.
Thus, no additional lift or moment on the cavitator is produced by [[omega].sub.z].
Cavitator not only creates and sustains supercavitation but also controls the hydrodynamic forces around the nose as control surface.
where [R.sub.n] is cavitator radius, [[alpha].sub.c] = w/V + [[delta].sub.c], [[delta].sub.c] is cavitator deflection angle, and drag coefficient is [C.sub.x] = [C.sub.x0](1 + [sigma]),being [C.sub.x0] = 0.82.
The resulting Diehl Defence Barracuda has a solid propellant rocket, an autopilot, an inertial measuring unit and an articulated conical cavitator that also provides pitch and yaw control.
If a blunt-nosed cavitator can be made strong enough, and it is moving fast enough, then (maybe) it can generate a cavity by vaporising the target material.
[23], in the geometries with an edge, such as blunt and conical cylinders and disk cavitator, cavity starts from the fracture point (forehead edge), and in the smooth bodies, such as hemispherical cylinder, cavity starts from the separation point of the flow.
The relevant algorithm for this solution is as follows: once the ellipse aspect ratio, the ratio of the larger diameter to the smaller one, is determined, the elliptical head of the cavitator is segmented and, for each segment, axisymmetric BEM is implemented and converged as mentioned above.