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Efficacy of Botulinum Toxin Versus Lidocaine in Treating Masticatory Myofascial Face Pain Using Ultrasound and EMG Guided Techniques

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified October 2009 by University of California, Los Angeles.
Recruitment status was:  Not yet recruiting
Information provided by:
University of California, Los Angeles Identifier:
First received: October 8, 2009
Last updated: NA
Last verified: October 2009
History: No changes posted

Botulinum toxin-A (BTX-A) prevents the release of acetylcholine in presynaptic terminals of the neuromuscular junction. It has been proposed to be effective in spastic conditions of the head and neck including oromandibular dystonias, bruxism, and muscular hypertrophy (1,2,3,4). However, only one randomized, double-blinded, placebo controlled trial has been completed involving 20 patients demonstrating both objective and subjective improvement in the BTX-A treated group over those treated with saline at one week, one month, and six months (5).

Currently, in most orofacial pain practices, when the diagnosis of masticatory myofascial pain in the head region is made, patients are treated with a standard myofascial protocol. This protocol involves stretching, application of moist heat, spray and stretch, and lidocaine trigger point injections into the masticatory muscles. This is considered the standard of care among most orofacial pain practioners.

There have been no randomized, double-blinded, head-to-head trials comparing BTX-A injections to lidocaine injections in the treatment of masticatory myofacial pain. Moreover, in all studies, muscles were targeted using surface landmarks with no confirmatory tests to guarantee the medication was administered to the intended muscle. In previous studies, the medial and lateral pteryoid muscles, important masticatory muscles that is often hyperactive in masticatory myofacial pain was not injected due to lack of palpable surface landmarks. Ultrasound and EMG guidance will help us locate these muscles.

The purpose of this study is to objectively measure functional improvement in patients with masticatory myofascial pain injected with lidocaine versus BTX-A. A pilot study enrolling 20 patients is proposed. 20 patients will be randomized to receive either BTX-A or lidocaine injections into the bilateral temporalis, masseter, and medial and lateral pteryoid. Objective and subjective clinical parameters will be measured. These include pain at rest and with chewing, maximum non-assisted and assisted mouth opening, protrusive and laterotrusive jaw movements, subjective efficacy of treatment, and side-effects of treatment. Patients will be assessed at baseline, one week, one month, and three months after the procedure.

Condition Intervention Phase
Face Pain
Drug: lidocaine
Drug: chemodenercation
Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Efficacy of Botulinum Toxin Versus Lidocaine in Treating Masticatory Myofascial Face Pain Using Ultrasound and EMG Guided Techniques

Resource links provided by NLM:

Further study details as provided by University of California, Los Angeles:

Primary Outcome Measures:
  • clinical response [ Time Frame: 6 months ] [ Designated as safety issue: Yes ]

Estimated Enrollment: 20
Study Start Date: October 2009
Estimated Study Completion Date: October 2010
Estimated Primary Completion Date: October 2010 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: Lidocaine
lidocaine injection group
Drug: lidocaine
1cc 1%
Experimental: Botulinum Drug: chemodenercation
botulinum toxin


Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Subjects are to have identifiable painful myofascial trigger points in the masseter, temporalis, and medial and lateral pterygoid muscles.
  • Subjects will be examined by the principle investigators to determine if the individual is a suitable candidate for the study, based on active triggerpoints and willingness to participate in the study

Exclusion Criteria:

  • Pregnant woman will be excluded from participation as potential risk is noted in product label indications. Individuals over the age of 65 will be excluded per product label indications that reflect lack of data in individuals over age 65.
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Please refer to this study by its identifier: NCT00992108

United States, California
Westwood Associates
Los Angeles, California, United States, 90024
Sponsors and Collaborators
University of California, Los Angeles
Principal Investigator: Marisa Chang, M.D. University of California, Los Angeles
  More Information

Responsible Party: Marisa Chang, M.D., UCLA Identifier: NCT00992108     History of Changes
Other Study ID Numbers: 8295968 
Study First Received: October 8, 2009
Last Updated: October 8, 2009
Health Authority: United States: Institutional Review Board

Keywords provided by University of California, Los Angeles:
Myofascial pain
Masticatory myofascial face pain from bruxism and clenching

Additional relevant MeSH terms:
Facial Pain
Neurologic Manifestations
Nervous System Diseases
Signs and Symptoms
Botulinum Toxins
Anesthetics, Local
Central Nervous System Depressants
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents
Anti-Arrhythmia Agents
Voltage-Gated Sodium Channel Blockers
Sodium Channel Blockers
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action
Acetylcholine Release Inhibitors
Cholinergic Agents
Neurotransmitter Agents processed this record on December 06, 2016