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Extraction: Effects of pH00:53

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Consider a neutral form of an amine, B, with a partition coefficient, K, in a liquid mixture containing organic and aqueous phases. The pH of the aqueous phase affects the charge on acidic and basic solutes, and the charged form is usually more soluble in the aqueous phase. Suppose the conjugate acid form of the amine is soluble only in the aqueous phase while the base form is soluble in both phases. Then the distribution coefficient, D, can be given as the ratio of amine concentration in the...
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Information is everywhere and its presentation—such as how and when items are presented—can impact our perceptions and decisions surrounding the info. This broad concept umbrellas framing effects—influences that occur due to the way information is framed in its appearance, whether it’s purely the order or the specific wording of a message. Let’s take a look at numerous ways in which two versions of something can objectively say the same thing, yet we respond in...
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Updated: Jan 25, 2026

Lipid Bilayer Vesicle Generation Using Microfluidic Jetting
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Lipid Bilayer Vesicle Generation Using Microfluidic Jetting

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Is the jet injection effective for teeth extraction?

H Ocak1, E F Akkoyun2, H A Çolpak3

  • 1OCAK Oral and Maxillofacial Surgery Private Clinic, Kayseri, Turkey.

Journal of Stomatology, Oral and Maxillofacial Surgery
|May 12, 2019
PubMed
Summary
This summary is machine-generated.

Needleless jet injection for dental anesthesia was less effective and caused more pain than traditional needle injections. Patients experienced higher pain and discomfort with the INJEX® device during tooth extractions.

Keywords:
Local anaesthesia procedureNeedleless injcetion, INJEX systemTooth extraction

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Area of Science:

  • Dentistry
  • Anesthesiology
  • Medical Devices

Background:

  • Local anesthesia is standard for invasive dental procedures.
  • Needle phobia is a common patient concern.
  • Needleless jet injection devices offer an alternative to traditional needles.

Purpose of the Study:

  • To evaluate the effectiveness and patient acceptance of needleless jet injection (INJEX®) for infiltrative anesthesia.
  • To compare jet injection with conventional needle infiltration anesthesia for tooth extractions.

Main Methods:

  • A study involving 28 adult patients undergoing tooth extractions.
  • Comparison of INJEX® jet injection versus traditional needle infiltration anesthesia on symmetrical teeth.
  • Standardized anesthetic dosage (Ultracain DS forte) administered buccally, lingually, and palatally.

Main Results:

  • Jet injection with INJEX® resulted in significantly higher pain and discomfort scores during tooth extraction (P=0.026).
  • The INJEX® device was found to be ineffective for local infiltrative anesthesia in tooth extractions.
  • Patient acceptance may be higher for patients accustomed to traditional local infiltration anesthesia.

Conclusions:

  • Needleless jet injection using the INJEX® device is not effective for local infiltrative anesthesia in dental procedures like tooth extractions.
  • The "pop" sound and inadequate anesthetic delivery were identified as drawbacks of the jet injection method.
  • Further research may be needed to improve needleless injection technologies for dental applications.