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As the speed of a handpiece increases, its torque subsequently decreases (slow-speed handpieces have high torque, whereas high-speed handpieces, like the air turbine system, have a low torque) The free running speed of 1:5 gear ratio electric handpiece is the same as its cutting speed; thus, 40,000 motor speed x 5 = 200,000 rpm burr speed.
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.
For instance, a latch type, or right angle bur, is only used in the slow-speed handpiece with contra-angle attachment. A long shank or shaft is only used in slow speed when the contra-angle is not in use, and finally, a friction grip bur, which is a small bur, is used only in the high-speed 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
The periodontal curette is a type of hand-activated instrument used in dentistry and dental hygiene for the purpose of scaling and root planing. [1] The periodontal curette is considered a treatment instrument and is classified into two main categories: universal curettes and Gracey curettes. [1]
The composition of hand instruments is continuously evolving, which is why it may be a challenge to find the proper instrument for the right clinical situation. [3] With the broad variation of instrument designs and materials, it allows dental professionals to implement periodontal therapy with reduced strain and increased comfort levels for both the clinician and the patient. [3]
A study published by Martina et al. [10] stated that rapid maxillary expansion is not more effective than slow maxillary expansion in expanding the maxilla in patients with posterior crossbite. It is important to keep in mind that different studies use different rapid and slow expansion devices and thus comparability between studies is difficult.
Midwest Dental Care was founded in 1968 by David Hehli with the opening of his first clinic in Mondovi, Wisconsin. He eventually grew his practice to several dental offices throughout Wisconsin. Midwest Dental became the largest solely owned dental practice in the country at that time. Hehli died on July 16, 2020, at the age of 77. [1]
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