Oral behaviours and wake-time masseter activity in patients with masticatory muscle pain.
bruxism
electromyography
pain
temporomandibular disorders
wake-time bruxism
wake-time parafunction
Journal
Journal of oral rehabilitation
ISSN: 1365-2842
Titre abrégé: J Oral Rehabil
Pays: England
ID NLM: 0433604
Informations de publication
Date de publication:
Sep 2021
Sep 2021
Historique:
revised:
06
06
2021
received:
01
01
2021
accepted:
24
06
2021
pubmed:
30
6
2021
medline:
17
8
2021
entrez:
29
6
2021
Statut:
ppublish
Résumé
Little is known about wake-time masseter activity of patients with masticatory muscle pain in real-life settings. The aims of this study were (1) to assess wake-time masseter activity of women with masticatory muscle pain (MMP) and compare it with that of pain-free women; and (2) to investigate the association between objectively measured masseter contractions and self-reported oral behaviours. Adult women (N = 27) diagnosed with MMP were age-matched with pain-free women (N = 26). The electromyographic (EMG) activity of the masseter muscle when awake was recorded unilaterally for two consecutive days. The number of contraction episodes and relative contraction time (%) were calculated using cut-off thresholds of 3%, 5% and 10% of maximum voluntary contraction (MVC). Self-reported daytime oral activity was assessed using the Oral Behaviours Checklist (OBC, items 3-21). Data were analysed using univariate tests and mixed-model analyses. The number of contraction episodes was similar between groups for all detection thresholds, but the relative contraction time at the lower detection thresholds (i.e. 3% MVC and 5% MVC) was significantly longer (1.5-fold) in the MMP than in the pain-free group. The OBC scores were significantly higher in the women with MMP than in controls, but no positive association could be found between EMG variables and OBC scores. Women with MMP engage in low-level masseter muscle contractions, which last longer than those of pain-free controls. There was no relationship between self-reported oral behaviours and masseter activity when awake. These findings support the notion that prolonged low-level clenching when awake may play a role in the pathophysiology of MMP.
Sections du résumé
BACKGROUND
BACKGROUND
Little is known about wake-time masseter activity of patients with masticatory muscle pain in real-life settings.
OBJECTIVES
OBJECTIVE
The aims of this study were (1) to assess wake-time masseter activity of women with masticatory muscle pain (MMP) and compare it with that of pain-free women; and (2) to investigate the association between objectively measured masseter contractions and self-reported oral behaviours.
METHODS
METHODS
Adult women (N = 27) diagnosed with MMP were age-matched with pain-free women (N = 26). The electromyographic (EMG) activity of the masseter muscle when awake was recorded unilaterally for two consecutive days. The number of contraction episodes and relative contraction time (%) were calculated using cut-off thresholds of 3%, 5% and 10% of maximum voluntary contraction (MVC). Self-reported daytime oral activity was assessed using the Oral Behaviours Checklist (OBC, items 3-21). Data were analysed using univariate tests and mixed-model analyses.
RESULTS
RESULTS
The number of contraction episodes was similar between groups for all detection thresholds, but the relative contraction time at the lower detection thresholds (i.e. 3% MVC and 5% MVC) was significantly longer (1.5-fold) in the MMP than in the pain-free group. The OBC scores were significantly higher in the women with MMP than in controls, but no positive association could be found between EMG variables and OBC scores.
CONCLUSION
CONCLUSIONS
Women with MMP engage in low-level masseter muscle contractions, which last longer than those of pain-free controls. There was no relationship between self-reported oral behaviours and masseter activity when awake. These findings support the notion that prolonged low-level clenching when awake may play a role in the pathophysiology of MMP.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
979-988Subventions
Organisme : New Zealand Dental Research Foundation
Informations de copyright
© 2021 John Wiley & Sons Ltd.
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