Dental drill – Disposable Pharyngeal Mirror – Health Care Netipot
History
Foot-powered dental drill
The Indus Valley Civilization has yielded evidence of dentistry being practiced as far back as 7000 BCE. This earliest form of dentistry involved curing tooth related disorders with bow drills operated, perhaps, by skilled bead craftsmen. The reconstruction of this ancient form of dentistry showed that the methods used were reliable and effective. Cavities of 3.5 mm depth with concentric groovings indicate use of a drill tool. The age of the teeth has been estimated at 9000 years. In later times, mechanical hand drills were used. Like most hand drills, they were quite slow, with speeds of up to 15 rpm. In 1864, British dentist George Fellows Harrington invented a clockwork dental drill named Erado. The device was much faster than earlier drills, but also very noisy. In 1868, American dentist George F. Green came up with a pneumatic dental drill powered with pedal-operated bellows. James B. Morrison devised a pedal-powered burr drill in 1871.
The first electric dental drill was patented in 1875 by Dr. Green, a development that revolutionized dentistry. By 1914, electric dental drills could reach speeds of up to 3000 rpm. A second wave of rapid development occurred in the 1950s and 60s, including the development of the air turbine drill.
The modern incarnation of the dental drill is the air turbine handpiece, developed by John Patrick Walsh (later knighted) and members of the staff of the Dominion Physical Laboratory (DPL) Wellington , New Zealand. The first official application for a provisional patent for the handpiece was granted in October 1949. This handpiece was driven by compressed air. The final model is held by the Commonwealth Inventions development Board in Canada. The New Zealand patent number is No/104611. The patent was granted in November to John Patrick Walsh who conceived the idea of the contra angle air-turbine handpiece after he had used a small commercial-type air grinder as a straight handpiece. Dr. John Borden developed it in America and it was first commercially manufactured and distributed by the DENTSPLY Company as the Borden Airotor in 1957.
Current iterations can operate at up to 800,000 rpm, however, most common is a 400,000 rpm “high speed” handpiece for precision work complemented with a “low speed” handpiece operating at a speed that is dictated by a micromotor which creates the momentum (max up to 40,000 rpm) for applications requiring higher torque than a high-speed handpiece can deliver.
Dental bur
A collection of various burs used in dentistry.
A dental bur is a type of drill bit used in a handpiece (commonly called a dental drill). The burs are usually made of tungsten carbide or diamond. The three parts to a bur are the head, the neck, and the shank.
The head of the bur contains the blades which produce the cutting action. These blades may be positioned at different degrees of angles in order to change the property of the bur. More obtuse angles will produce a negative rake angle which increases the strength and longevity of the bur. More acute angles will produce a positive rake angle which has a sharper blade, but which dulls more quickly.
There are various shapes of burs, which helps to determine a selection of a bur in a given situation. Shapes include a round, inverted cone, straight fissure, tapered fissure, and pear-shaped burs. Additional cuts across the blades of burs were added to increase cutting efficiency, but their benefit has been minimized with the advent of high-speed handpieces. These extra cuts are called crosscuts.
Due to the wide array of different burs, numbering systems to categorize burs are used and include a US numbering system and a numbering system used by the International Organisation for Standardisation (ISO).
Alternatives
Starting in the 1990s, a number of alternatives to conventional rotary dental drills have been developed. These include laser ablation systems and air abrasion devices (essentially miniature sand blasters).
Other uses
Dental drills and drill bits are commonly used by jewellers and hobbyists for high-precision drilling work.
References
^ Coppa, A. et al. 2006. Early Neolithic tradition of dentistry. Nature. Volume 440. 6 April 2006.
^ BBC (2006). Stone age man used dentist drill.
^ MSNBC (2008). Dig uncovers ancient roots of dentistry.
^ Handpiece, Use, Care and Maintenance”, Franzel, Mattana. University Detroit Mercy School of Dentistry literature 2007
^ a b Summit, James B., J. William Robbins, and Richard S. Schwartz. “Fundamentals of Operative Dentistry: A Contemporary Approach.” 2nd edition. Carol Stream, Illinois, Quintessence Publishing Co, Inc, 2001. Pages 139 – 143. ISBN 0-86715-382-2.
MedTerms definition for Drill, dental
“Dental drills – enemy of the people?” from the British Dental Association museum
Australian Dental Journal:1 p59-62
External links
“Dental More Gentle with Painless ‘Drillings’ and Matching Fillings”, Food and Drug Administration (FDA) Consumer magazine, May-June 1999
“‘Robotic’ dental drill to be tested on humans”, New Scientist, 20 April 2005
“Dental Technology and Research”, Canadian Dental Association Web Site – (PDF file)
“History of Dentistry”, American Dental Association Web Site
v d e
Dentistry
Recognized Specialties
(in the United States)
Endodontics – Oral and Maxillofacial Pathology – Oral and Maxillofacial Radiology – Oral and Maxillofacial Surgery – Orthodontics and Dentofacial Orthopedics – Pediatric Dentistry – Periodontics – Prosthodontics – Dental public health – Restorative Dentistry
Unrecognized Specialties
(in the United States)
Cosmetic Dentistry – Dental Implantology – Temporomandibular Joint Disorder – Geriatric dentistry
Other
Forensic Odontology – Dental Traumatology – Oral pathology
Procedures
Dental extraction – Tooth filling – Root canal therapy – Root end surgery – Scaling and root planing – Teeth cleaning -Tooth bonding – Tooth polishing – Tooth bleaching
See also
List of oral health and dental topics – List of basic dentistry topics – Oral hygiene – Dental instruments – Restorative materials
Categories: Dental equipmentHidden categories: All articles with unsourced statements | Articles with unsourced statements from April 2009
The e-commerce company in China offers quality products such as Disposable Pharyngeal Mirror , Health Care Netipot, and more. For more , please visit china disposable medical suppliers today!
Processing your request, Please wait....
