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Lookup NU author(s): Professor John Whitworth,
Dr John Meechan
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Aim: To test the hypothesis that the Stabident intraosseous injection is a potentially high-pressure technique, which carries serious risks of anaesthetic cartridge failure. Methodology: A standard Astra dental syringe was modified to measure the internal pressure of local anaesthetic cartridges during injection. Intra-cartridge pressures were measured at 1 s intervals during slow (approximately 1.5 s) and rapid (<10 s) injections of 2% Xylocaine with 1 : 80 000 adrenaline (0.25 cartridge volumes) into air (no tissue resistance), or into freshly prepared Stabident perforation sites in the anterior mandible of freshly culled young and old sheep (against tissue resistance). Each injection was repeated 10 times over 3 days. Absolute maximum pressures generated by each category of injection, mean pressures at 1 s intervals in each series of injections, and standard deviations were calculated. Curves of mean maximum intra-cartridge pressure development with time were plotted for slow and rapid injections, and one-way ANOVA (P < 0.05) conducted to determine significant differences between categories of injection. Results: Pressures created when injecting into air were less than those needed to inject into tissue (P < 0.001). Fast injection produced greater intracartridge pressures than slow delivery (P < 0.05). Injection pressures rose more quickly and to higher levels in small, young sheep mandibles than in larger, old sheep mandibles. The absolute maximum intracartridge pressure developed during the study was 3.31 MPa which is less than that needed to fracture glass cartridges. Conclusions: Stabident intraosseous injection conducted in accordance with the manufacturer's instructions does not present a serious risk of dangerous pressure build-up in local anaesthetic cartridges. © 2005 International Endodontic Journal.
Author(s): Whitworth JM, Ramlee RAM, Meechan JG
Publication type: Article
Publication status: Published
Journal: International Endodontic Journal
Print publication date: 01/05/2005
ISSN (print): 0143-2885
ISSN (electronic): 1365-2591
PubMed id: 15876292
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