An in vitro investigation of the effect of bevel design on the penetration and withdrawal forces of dental needles

作者：Steele A C^*; German M J; Haas J; Lambert G; Meechan J G

来源：Journal of Dentistry, 2013, 41(2): 164-169.

DOI：10.1016/j.jdent.2012.10.016

• Dental
• Needle
• Bevel
• Penetration
• In vitro

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. %26lt;br%26gt;Methods: Maximum needle penetration forces were measured using a 10 N load cell mounted on an Instron universal testing machine. Forces were determined during insertion through a 0.4 mm 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 10 mm 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 50 mm/min. %26lt;br%26gt;Results: The novel design required less force to penetrate the membrane at 30 degrees and 150 degrees compared to the standard design (mean forces at 30 degrees being 0.75 N and 0.98 N for novel and standard designs respectively [p %26lt; 0.001] and at 150 degrees 0.52 N and 0.66 N respectively [p %26lt; 0.001] but more force at 90 degrees penetration tests (0.60 N and 0.46 N respectively [p %26lt; 0.001]). The novel design required less force to insert 10 mm into the polyvinyl siloxane (1.80 N and 2.54 N respectively [p %26lt; 0.001]). %26lt;br%26gt;Conclusion: The novel design needed less force than the standard version to penetrate a thin membrane when used at 30 degrees and 150 degrees to the surface and to penetrate a polyvinyl siloxane block to a depth of 10 mm but required more force to penetrate a thin membrane at 90 degrees. %26lt;br%26gt;Clinical significance: Needle bevel design affects the penetration and withdrawal forces of dental needles in vitro.

• 出版日期2013-2