Abstract
Objectives
Tooth clenching has been suggested to be related to temporomandibular pain. However, the electromyographic characteristics of daytime clenching episodes have been minimally investigated. This study aimed to analyze the frequency, amplitude, and duration of daytime clenching episodes in patients with masticatory muscle pain and pain-free individuals.
Methods
Fifteen women with masticatory muscles myalgia (MP group, mean ± SD age = 26.4 ± 7.6 years) matched for age to 18 pain-free women (CTR group, mean ± SD age = 25.3 ± 2.8 years) were submitted to three different ability tasks (filling out questionnaires for 40 min, reading for 20 min, and playing a videogame for 20 min). The electromyographic activity periods (AP) of the right masseter greater than 10 % (AP10), 20 % (AP20), and 30 % (AP30) of the maximum voluntary contraction were analyzed.
Results
The mean frequencies of AP10, AP20, and AP30 were greater in MP than in CTR individuals (all p < 0.05). The mean duration of AP10 was higher in MP group than CTR group only while filling out the questionnaires (p = 0.0033). CTR group had an increased frequency and duration of AP10 while playing the videogame than while reading a magazine. The ability tasks did not affect the muscle activity in the MP group.
Conclusions
Individuals with masticatory muscle pain have an increased frequency of both high and low-intense daytime clenching episodes. The type of ability task affects the frequency and the duration of clenching episodes only in pain-free individuals.
Clinical relevance
Clinicians should recognize that the frequency and intensity of daytime clenching are noticeably increased in individuals with masticatory muscle pain in order to better tailor treatment.
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Acknowledgments
The authors thank Dr. Andrea Bottin and Dr. Alessio Bocci for their technical assistance and Dr. Paolo Chiodini for statistical advice.
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Conflict of interest
Dr. Tommaso Castroflorio was involved in the technical development of the Bruxoff Device.
Funding
This study was supported by the network of excellence STRAIN (Regione Campania) at the University of Naples Federico II, Italy, through a research fellowship.
Informed consent
All participants gave their informed consent prior to the inclusion in the study.
Ethical approval
This clinical investigation was reviewed by the Ethics Committee of the University of Naples Federico II.
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Cioffi, I., Landino, D., Donnarumma, V. et al. Frequency of daytime tooth clenching episodes in individuals affected by masticatory muscle pain and pain-free controls during standardized ability tasks. Clin Oral Invest 21, 1139–1148 (2017). https://doi.org/10.1007/s00784-016-1870-8
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DOI: https://doi.org/10.1007/s00784-016-1870-8