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Related Concept Videos

Local Anesthetics: Adverse Effects01:12

Local Anesthetics: Adverse Effects

744
While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
Once absorbed into the systemic circulation, local anesthetics can affect the organs that depend on the functioning of sodium...
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Local Anesthetics: Clinical Application as Surface, Infiltration, and Conduction Block Anesthesia01:30

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Depending on the target organ, local anesthetics (LAs) can be administered via various routes. In surface anesthesia, LAs are applied directly to the surface of the skin or mucous membranes. It is widely used for topical skin numbing before venipuncture or minor surgical procedures. Commonly used surface local anesthetics are lidocaine or benzocaine sprays or creams. Surface anesthesia occurs within 5 minutes and lasts for about 60 minutes. One of the main disadvantages of topical anesthesia is...
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Local Anesthetics: Common Agents and Their Applications01:23

Local Anesthetics: Common Agents and Their Applications

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Local anesthetics (LAs) are commonly used for various applications in medical and dental procedures. Some of the common agents used are cocaine, lidocaine, and bupivacaine.
Cocaine is an ester of benzoic acid and methylecgogine. It is used to anesthetize and vasoconstrict locally. Currently, it is used primarily for topical applications. It is beneficial for surgeries on the upper respiratory tract, providing anesthesia and shrinking the mucosa. Cocaine in the form of cocaine hydrochloride is...
874
Local Anesthetics: Pharmacokinetics01:13

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1.2K
The potency and duration of action of local anesthetics (LAs) are determined by their pharmacokinetics. Pharmacokinetics describes how LAs are absorbed, distributed, metabolized, and eliminated from the body. When administered to the vascular tissues, LAs are quickly absorbed and enter the systemic circulation, reducing their localized effects. Adding vasoconstrictors such as epinephrine to LAs reduces their absorption into the systemic circulation, making them clinically effective. The...
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Local Anesthetics: Chemistry and Structure-Activity Relationship01:30

Local Anesthetics: Chemistry and Structure-Activity Relationship

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Local anesthetics (LAs) are drugs that induce a temporary loss of sensation in a limited body area, preventing pain. Cocaine was the first local anesthetic discovered in the late 19th century. Cocaine is a benzoic acid ester obtained from the leaves of coca shrubs and was often used for its psychotropic effects. Cocaine was first isolated in 1860 by Albert Niemann. Sigmund Freud studied the physiological actions of cocaine. Carl Koller later introduced it into clinical practice in 1884 as a...
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Local Anesthetics: Clinical Application as Epidural Anesthesia01:29

Local Anesthetics: Clinical Application as Epidural Anesthesia

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Epidural anesthetics are administered in the fat-filled epidural space, the outermost part of the spinal canal. This technique is commonly employed for pain management and anesthesia during lower abdomen and pelvis surgeries or labor and delivery.
Since epidural anesthetics can be infused through an epidural catheter, all types of drugs, including short-acting ones, can be administered. Chloroprocaine and lidocaine are examples of short and long-duration anesthetics, respectively. Bupivacaine...
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Failures of Local Anesthesia: Dental Perspective.

Kainat Anjum1, Karpagavalli Shanmugasundaram2, John Moran1

  • 1Clinical Preceptee, Rutgers School of Dental Medicine, Newark, NJ 07103, USA.

Dental Clinics of North America
|November 14, 2025
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Summary

Local anesthesia failures in dentistry are common, stemming from operator technique, patient factors, and even anatomy. Understanding these causes is key to improving anesthetic success rates for dental procedures.

Keywords:
Dental anesthesiaDental blocksDental local anesthetic complicationsInferior alveolar nerve blockLocal anesthesia errorsLocal anesthesia failureNerve blocksSuccessful local anesthesia

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Area of Science:

  • Dentistry
  • Anesthesiology
  • Pharmacology

Background:

  • Local anesthesia (LA) failure presents a significant challenge in dental practice.
  • Understanding the multifactorial nature of LA failure is crucial for effective treatment.
  • Prevalence of LA failure necessitates a comprehensive review of contributing factors.

Purpose of the Study:

  • To review the most common factors contributing to local anesthesia failures in dentistry.
  • To explore pharmacologic, inflammatory, psychological, and anatomic elements influencing LA success.
  • To discuss strategies for preventing anesthetic failures in dental patients.

Main Methods:

  • Literature review of updated evidence on anesthetic agents and techniques.
  • Analysis of anatomic variations impacting nerve blocks.
  • Exploration of patient-specific factors like systemic conditions and anxiety.

Main Results:

  • LA failures are influenced by operator error, anesthetic properties, and patient-specific issues.
  • Anatomic variations (e.g., bifid canals) and accessory innervation can impede LA effectiveness.
  • Psychological factors, systemic diseases, and inflammation play a role in anesthetic outcomes.

Conclusions:

  • Addressing LA failures requires a holistic approach, considering operator, patient, and technical factors.
  • Improved knowledge of anatomy and anesthetic pharmacology can enhance success rates.
  • Preventive strategies are essential for optimizing local anesthesia in dentistry.