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Lookup NU author(s): Dr Matthew GermanORCiD,
Dr John Meechan
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Objectives: To compare the effect on insertion and withdrawal forces using needles with a standard atraumatic bevel to those with a novel asymmetrical bevel in vitro. Methods: Maximum needle penetration forces were measured using a 10 newton load cell mounted on an Instron universal testing machine. Forces were determined during insertion through a 0.4mm polyurethane membrane mounted at 90 degrees (n = 30 of each design), 30 degrees (n = 16 of each design) and 150 degrees (n = 16 of each design) to the needle bevel and during a 10mm insertion into a polyvinyl siloxane block mounted at 90 degrees to the bevel (n = 16 of each design). In all tests the rate of insertion was 50mm/min. Results: The novel design required less force to penetrate the membrane at 30 and 150 degrees compared to the standard design (mean forces at 30 degrees being 0.75N and 0.98N for novel and standard designs respectively [p< 0.001] and at 150 degrees 0.52N and 0.66N respectively [p < 0.001] but more force at 90 degrees penetration tests (0.60N and 0.46N respectively [p< 0.001]). The novel design required less force to insert 10mm into the polyvinyl siloxane (1.80N and 2.54N respectively [p < 0.001]). Conclusion: The novel design needed less force than the standard version to penetrate a thin membrane when used at 30 and 150 degrees to the surface and to penetrate a polyvinyl siloxane block to a depth of 10mm but required more force to penetrate a thin membrane at 90 degrees. Clinical significance: Needle bevel design affects the penetration and withdrawal forces of dental needles in vitro.
Author(s): Steele AC, German MJ, Haas J, Lambert G, Meechan JG
Publication type: Article
Publication status: Published
Journal: Journal of Dentistry
Print publication date: 05/11/2012
ISSN (electronic): 1879-176X
Publisher: Elsevier Ltd
PubMed id: 23137996
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