Prevalence of Bruxism in Hemifacial-Spasm Patients
Journal of Prosthodontics. 2015-11-20; 26(4): 280-283
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Ella B(1)(2), Guillaud E(3), Langbour N(4), Guehl D(2)(4), Burbaud P(2)(4).
(1)Department of Odontology and Buccal Health, Bordeaux University Hospital,
(2)Department of Clinical Neurophysiology, Bordeaux University Hospital,
(3)Institute of Cognitive Neuroscience and Integrative Aquitaine, Bordeaux
University, Bordeaux, France.
(4)Institute of Neurodegenerative Disorders, Bordeaux University, Bordeaux,
PURPOSE: A previous study reported an increased prevalence of bruxism (25%) in
patients with cranio-cervical dystonia (CCD) compared to normal controls (13%).
CCD can affect the muscles of the head and neck. Besides the CCD affecting these
muscles, hemifacial spasm (HFS) is a form of peripheral myoclonus due to a
neurovascular conflict affecting the muscles of the face. The fact that they
affect the same muscle regions could lead to other links in clinical
manifestations such as bruxism, which is more common in patients with CCD than in
the normal population. The aim was to study the prevalence of bruxism in patients
MATERIALS AND METHODS: Patients with HFS were enrolled in the department of
clinical neurophysiology (Bordeaux University Hospital) over a 6-month period.
They were paired regarding age, the absence of neurological pathology or
neuroleptics intake. To be included in the study, patients needed to have had
unilateral involuntary facial muscle contractions affecting one hemiface. A
hetero-questionnaire and a clinicial study were performed. The diagnostic
criteria of bruxism included parafunction items such as grinding and clenching
and at least one of the following clinical signs: abnormal tooth wear,
temporomandibular joint (TMJ) pain, TMJ clicking, muscle hypertonia (masseter or
temporal muscles). Additional epidemiological data were collected including age,
sex, disease duration, stress, and sleep disorders. Stress symptoms inventory
included symptoms like depression, strong heartbeat, dry mouth, anger, inability
to concentrate, weakness, fatigability, insomnia, headache, and excessive
sweating. The sleep disorder diagnosis included at least two of the symptoms
described in the ICSD-3. All these criteria were recorded as either present
(scored “1”) or absent (scored “0”).
RESULTS: The prevalence of bruxism in the two groups (normal and HFS) was not
significantly different (p = 0.37). The rate was not significantly different
between sleep and awake bruxism (p = 0.15) in both groups. Stress influenced the
occurrence of bruxism in these two groups (p < 0.001). CONCLUSION: The results of this study indicated that clenching behaviors were higher in the HFS group, and that factors such as stress affected this group. The prevalence of bruxism was not higher in this population than in the normal control. © 2015 by the American College of Prosthodontists.