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Air turbine used in a dental handpiece Correlation between rotational speed and torque Correlation between rotational speed and turbine output power. The turbine is powered by compressed air between 35 and 61 pounds per square inch (~2,4 to 4,2 bar), [1] [2] which passes up the centre of the instrument and rotates a Pelton wheel in the head of the handpiece.
The size is imprinted on the spanners in millimeter values or inch sizes with intermediate sizes in fractions (older British and current US spanners). The two systems are in general not compatible, which can result in rounding of nuts and bolts (i.e. using a 13 mm (0.51 in) spanner in place of a 1 ⁄ 2 inch (12.70 mm)).
Separation of nickel titanium rotary files happens due to torsional failure, cyclic fatigue, or the combination of both in clinical practice. [2]Torsional failure – Torsional failure happens when the tip of a file is locked but its shank is being rotated either manually or by a handpiece to the point that exceeds the elastic limit of the alloy.
Moyer's mixed dentition analysis was created in 1971 by Robert Moyers.This an analysis that is used in dentistry to predict the size of the permanent premolars and canines by measuring the width of the permanent incisors.
Periodontal scalers are dental instruments used in the prophylactic and periodontal care of teeth (most often human teeth), including scaling and root planing. The working ends come in a variety of shapes and sizes, but they are always narrow at the tip, so as to allow for access to narrow embrasure spaces between teeth.
The handles of the ISO instruments are colour coded and are available in three different lengths of 21mm, 25mm and 31mm where the extra length is non-cutting shaft. This extra length is particularly useful for posterior teeth where access and visibility is impaired. ISO files are made of stainless steel.
The process of preparation usually involves cutting the tooth with a rotary dental handpiece and dental burrs, a dental laser, or through air abrasion (or in the case of atraumatic restorative treatment, hand instruments), to make space for the planned restorative materials and to remove any dental decay or portions of the tooth that are ...
Coupland's elevators (also known as chisels) [1] [2] are instruments commonly used for dental extraction. They are used in sets of three each of increasing size and are used to split multi-rooted teeth and are inserted between the bone and tooth roots and rotated to elevate them out of the sockets. [ 3 ]
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