Needle tip deformation in local dental anesthesia – A technical note

Needle tip deformation in local dental anesthesia – A technical note

The aim of this in vitro study was to investigate the mechanical deformation rate of dental cannula tips after injection simulation in a new developed animal model. A new mechanical device was designed to define forces (100 g for 60 s) to impact a pigs jaw bone with different cannulas (25-Gauge/27-G...

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Bibliographic Details
Published in:Journal of the mechanical behavior of biomedical materials Vol. 126; p. 105034
Main Authors: Hartmann, Amely, Lawall, Tina, Philipp, Luhrenberg, Daubländer, Monika
Format: Journal Article
Language:English
Published: Netherlands Elsevier Ltd 01-02-2022
Subjects:
Anesthesia, Dental
Anesthesia, Local
Animals
Bevel design
Cannula
Cannula materials
Cutting profile
Deformation
Equipment Design
Injections
Inner diameter
Local anesthesia
Needles
Swine
Inner diameter
Deformation
Bevel design
Cannula
Local anesthesia
Cannula materials
Cutting profile
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Summary:The aim of this in vitro study was to investigate the mechanical deformation rate of dental cannula tips after injection simulation in a new developed animal model. A new mechanical device was designed to define forces (100 g for 60 s) to impact a pigs jaw bone with different cannulas (25-Gauge/27-Gauge) from dental local anaesthesia syringes. 8 different products (100 cannulas each) were evaluated. Cannula tips were examined for deformation under the digital microscope VHX-100 (500-fold magnification). 27G and 27G free flow showed a significantly lower likelihood of bending (OR 0.05; p = 0.0001). Comparing 27G cannulas of the same outer diameter but different inner diameter, large inner diameter produced a significantly higher deformation rate than those of cannulas with a standard inner diameter. 12–38% of the cannulas showed manufacturing defects and production-related deformation. Cannula deformation seems to depend on the inner diameter, bevel and cutting profile. Multiple use of the same cannula could result in more pronounced deformation, increasing the risk of complications during local anesthesia.
Bibliography:ObjectType-Article-1
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content type line 23
ISSN:1751-6161
1878-0180
DOI:10.1016/j.jmbbm.2021.105034