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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.
Miscellaneous endodontic instruments. From left: Lentulo spiral, reamer, K-file and H-file. Hand files can provide tactile sensation when cleaning or shaping root canals. This allows the dentist to feel changes in resistance or angulation, which can help determine curvature, calcification and/or changes in anatomy, in which two dimensional radiographs may not always identif
ISO 3245:2015 Rolling bearings — Needle roller bearings with drawn cup and without inner ring — Boundary dimensions, geometrical product specifications (GPS) and tolerance values ISO 3246:1977 Dentistry — Working space of the dentist — Definitions and principles [Withdrawn without replacement]
- 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.
W&H has a history of over 120 years in the manufacture of dental products. The initials W&H refer to the Group's two founders, Jean Weber and Hugo Hampel. In 1890, these two precision engineers founded a company in Berlin for the manufacture of straight and contra-angle handpieces.
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.
A Lentulo spiral. The notches at left allow it to fit into a slow-speed latch handpiece. A Lentulo spiral is a dental instrument used to properly distribute root canal sealer and cement evenly throughout the root canal system, as when performing endodontic therapy or a post and core cementation.
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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