ORAL HEALTH EVIDENCE-BASED PRACTICE PROGRAM
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Title Myofunctional Orthodontics May or May Not Produce a More Stable Result Than Traditional Orthodontics
Clinical Question In patients requiring orthodontic treatment, does myofunctional orthodontics produce a more stable result than traditional orthodontics?
Clinical Bottom Line There is insufficient evidence in the literature to support the claim that myofunctional orthodontics provides a more stable result than traditional orthodontics.
Best Evidence (you may view more info by clicking on the PubMed ID link)
PubMed ID Author / Year Patient Group Study type
(level of evidence)
#1) 21212169Tancan/201222 patients with Class II Division 1 Malocclusion.Case Series
Key resultsMasticatory muscle activity is decreased after treatment with pre-orthodontic trainer when measured by electromyography (EMG). The evidence provided demonstrates a myofunctional appliance has the following effects when measured by EMG: decreased activity of the Anterior Temporalis muscle while sucking (P<.05) and clenching (P<.001); decreased activity of the Mentalis muscle while clenching (P<.001); decreased acivity of the Orbicularis Oris muscle while sucking (P<.05) and clenching (P<.001); decreased activity of the Masseter muscle while clenching (P<.01).
#2) 22565519Pachori/20123 growing patients with Class II Division 1 Malocclusion.Case Series
Key resultsMandibular retrognathism can be corrected with myofunctional appliances.
Evidence Search ("Myofunctional Therapy"[Mesh] AND "Orthodontics"[Mesh]); ("Myofunctional Therapy"[Mesh] AND "Orthodontics"[Mesh]) AND "Orthodontic Retainers"[Mesh])
Comments on
The Evidence
The relevant articles employed were case studies with few subjects (15 patients; 3 patients) which required orthodontic treatment. No randomization was used. The results of the studies did not adequately relate how the myofunctional appliance produces a more stable result after treatment. Neither study had sufficient follow up to support the claim that retainers would not be required for these patients to maintain results long term. As the success of treatment of the Tancan study was an assessment of esthetics, the study reflects easily biased, subjective findings. The Pachori study provides objective data produced by electromyography, but there is insufficient evidence to support the claim that decreased masticatory muscle function improves occlusion.
Applicability Insufficient evidence exists to determine applicability.
Specialty/Discipline (Orthodontics)
Keywords myofunctional; orthodontics; myofunctional orthodontics
ID# 2667
Date of submission: 03/26/2014spacer
E-mail CaesarR@livemail.uthscsa.edu
Author Ray Caesar
Co-author(s)
Co-author(s) e-mail
Faculty mentor/Co-author Clarence C. Bryk, DDS, MS
Faculty mentor/Co-author e-mail BrykC@uthscsa.edu
Basic Science Rationale
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