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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 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 main components of a nickel titanium rotary file are tip size, taper, flutes, helix angle and measuring stop. There can be other features such as redial lands and measuring lines incorporated in some designs. Tip size – The tips size is the diameter of the tip of a file, which is in 100ths of a millimeter.
- The shank type and total length of the bur - The shape of the head - The size of the grit - The maximum diameter of the head For instance, a latch type, or right angle bur, is only used in the slow-speed handpiece with contra-angle attachment.
Measure widths of each of four permanent incisors of the lower jaw (mandibular central incisor and mandibular lateral incisor). The total Mesio-Distal width of the incisors is calculated A prediction chart is used for space available in each arch, and the value that matches closest to the sum of incisors is picked.
The length and width of teeth are measured from front to back and side to side using calipers. These measurements can be made directly from skeletal material or through dental casts of living humans. [1] The measurements that are reported most commonly are maximum crown length and maximum crown breadth. [3]
The dental dam sheets are predominantly made from rubber materials such as latex or nitrile and tend to be 15 cm by 15 cm in length and width. The thickness of each dam sheet is approximately between 0.14 mm and 0.38 mm but the size, shape, colour and material that the dam sheet is made from can vary with differing manufacturers.
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 ...
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