Aims and objectives
Parafunctional activity of the masticatory muscles in considered a risk factor for TMD.(1) The prospective cohort study carried out in the OPPERA Project (Orofacial Pain Prospective Evaluation and Risk Assesment) has detected a significant increase in the relative risk of painful TMD associated to frequent or multiple parafunctional activities.(2)
Exercises involving skeletal muscle contraction against external resistance are effective in improving muscle mass balance by stimulating muscle protein synthesis.
The result is muscle hypertrophy after chronic resistance training.(3)Muscle hypertrophy is not only induced by high-intensity...
Methods and materials
The study was carried out in the Department of Stomatology and Maxillofacial Surgery of Valencia University General Hospital (Valencia,
Spain),
following approval by the local Clinical Research Ethics Committee.
A case-control design was used.
A total of 31 subjects diagnosed with myofascial pain of the masticatory muscles were included between October 2014 and January 2016,
based on the following inclusion/exclusion criteria:
A diagnosis of myofascial pain (according to the Research Diagnostic Criteria for Temporomandibular Disorders [RDC/TMD]),
(5) with involvement of at least one of the...
Results
A total of 66 subjects were included in the study: 31 MFP-subjects and 35 controls.
None of the MFP-subjects or controls were excluded due to ultrasound-detected organic MM disease.
Likewise,
no subjects required exclusion a posteriori due to the absence of teeth in posterior segments,
since the routine panoramic X-rays obtained on the first visit in all subjects with TMD excluded this possibility.
The gender distribution was 8 males and 27 females in the control group and one male and 30 females in the study...
Conclusion
According to the working hypothesis,
the masticatory muscles of subjects with chronic MFP should be of greater width under resting conditions,
and with a lesser increase in width under contraction,
compared with the healthy controls.
The present study identified no significant differences in either variable in the MMs of subjects suffering MFP with involvement of these muscles.
Only two publications in the literature have been found comparing a hypothesis similar to the present study.
One of them detected statistically significant differences in MM width under...
Personal information
Pilar Moreno
Staff physician.
Department of Radiodiagnosis.
Valencia University General Hospital.
Valencia (Spain)
Avda.
Tres Cruces 2,
46014 – Valencia (Spain)
Rafael Poveda-Roda
Staff physician.
Department of Stomatology and Maxillofacial Surgery.
Valencia University General Hospital.
Valencia (Spain)
Avda.
Tres Cruces 2,
46014 – Valencia (Spain)
José Bagán
Chairman of Oral Medicine.
Faculty of Medicine and Dentistry,
Valencia University.
Head of the Department of Stomatology and Maxillofacial Surgery.
Valencia University General Hospital.
Valencia (Spain)
Avda.
Tres Cruces 2,
46014 – Valencia (Spain)
María Margaix
Dental surgeon....
References
1. Fernandes G,
Franco-Micheloni AL,
Siqueira JT,
Gonçalves DA,
Camparis CM.Parafunctional habits are associated cumulatively to painful temporomandibular disorders in adolescents.
Braz Oral Res.
2016;30.
2.
3.Ohrbach R,
Bair E,
Fillingim RB,
Gonzalez Y,
Gordon SM,
Lim PF,
Ribeiro-Dasilva M,
Diatchenko L,
Dubner R,
Greenspan JD,
Knott C,
Maixner W,Smith SB,
Slade GD.
Clinical orofacial characteristics associated with risk of first-onset TMD: the OPPERA prospective cohort study.
J Pain 2013;14:T33-50.
4.Phillips SM,
Tipton KD,
Aarsland A,
Wolf SE,
Wolfe RR.
Mixed muscle protein synthesis and...