Document Detail

Comparison of rotational speeds and torque properties between air-bearing and ball-bearing air-turbine handpieces.
MedLine Citation:
PMID:  2700689     Owner:  NLM     Status:  MEDLINE    
We examined the effects of air pressure on the free-running speed of air-bearing and torque-type ball-bearing air-turbine handpieces. The air pressure for the former should be kept at a certain high level to maintain the stable super-thin air-bearing film and to provide the quasi-constant speed of around 420,000 to 480,000 rpm. On the other hand, the air pressure for the latter could be adjusted to provide some varieties of speeds, ranging from about 150,000 to 320,000 rpm. Subsequently, to compare torque properties and cutting effectiveness between these two handpieces, weight-load cutting tests were conducted, using a glass-ceramic workpiece and a commercial diamond point. It was confirmed that the air-bearing handpiece had the lower torque power but exhibited better cutting effectiveness, compared with its counterpart.
M Taira; K Wakasa; M Yamaki; A Matsui
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Dental materials journal     Volume:  8     ISSN:  0287-4547     ISO Abbreviation:  Dent Mater J     Publication Date:  1989 Jun 
Date Detail:
Created Date:  1990-08-16     Completed Date:  1990-08-16     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8309299     Medline TA:  Dent Mater J     Country:  JAPAN    
Other Details:
Languages:  eng     Pagination:  26-34     Citation Subset:  D    
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MeSH Terms
Air Pressure
Dental High-Speed Equipment*
Evaluation Studies as Topic

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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