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50 rev port estomatol med dent cir maxilofac. 2020;61(2):45-51

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viously published study. Also, the GrindCare system worked Conclusions
well as a convenient portable device inducing a stimulus on a
unilateral temporal muscle. Both the proposed protocols presented clinical significance by
As there was no consistent evolution in the grinding activ- leading to a reduction in pain and consequent increase in the
ity in both protocols (Group I or II), pain might not be related patient -related outcomes. This decrease in the NRS pain score
to the number of grind events, as mentioned by other au- may have been influenced by the decreased grinding intensi-
27
thors, who pointed out that, in this clinical situation, care ty. Results suggest that a 4 -week protocol could be sufficient
must be taken to not create cause -effect relationships that are to relieve pain in SB. More studies on the subject of pain, with
too simplistic. This clinical trial showed that, during the treat- simple designs and effective solutions, for the assessment of
ment time (in both groups), the correlation between pain and these new devices should be performed.
muscular activity disappeared, evidencing the efficacy of CES.
Also, at 6 months post -treatment, there was no correlation
between muscle activity and pain in both groups. Ethical disclosures
The inconsistent outcome for NG following CES therapy is
moderately in line with the literature, with results showing a Protection of human and animal subjects. The authors
decrease in EMG of 35%–56.9% in the active treatment period declare that the procedures followed were in accordance with
and 31–38% in the control period. 14,15,22,28-31 Our findings were the regulations of the relevant clinical research ethics com-
smaller, but with a higher sample size, which implies de- mittee and with those of the Code of Ethics of the World Med-
creased intrinsic variability and increased statistical power of ical Association (Declaration of Helsinki).
the results obtained. In fact, the present study highlights the
fact that, besides being inconsistent, the evolution of NG Confidentiality of data. The authors declare that no patient
throughout the study was also not statistically significant. In data appear in this article.
23
a study published in 2013, whose design was similar to Group Right to privacy and informed consent. The authors declare
I, the authors detected an inconsistent development of NG that no patient data appear in this article.
with a wide range in NG parameters and consequent response
to CES. The present study corroborates this finding. Although
22
a recent study found that EMG event frequency could return Conflict of interest
to baseline levels in the follow -up, it also suggested the need
for more studies on this subject with larger sample sizes and The authors have no conflicts of interest to declare.
follow -up periods.
Central neuronal alterations (central sensitization), typical references
32
of chronic conditions, can also explain the weak correlation
between pain and EMG activity found in the present research. 1. Lobbezoo F, Ahlberg J, Glaros AG, Kato T, Koyano K, Lavigne GJ,
The authors suggest that intensity is the main contributor to et al. Bruxism defined and graded: an international
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Regarding the TI, the proposed treatments were effective, 2. Lobbezoo F, Ahlberg J, Raphael KG, Wetselaar P, Glaros AG, Kato
T, et al. International consensus on the assessment of bruxism:
with a statistically significant decrease during the active treat- Report of a work in progress. J Oral Rehabil. 2018;45:1-8.
ment and in the control period. There was no recurrence of TI 3. Manfredini D, Serra -Negra J, Carboncini F, Lobbezoo F. Current
in values similar to the Bas value. Our results suggest that, concepts of bruxism. Int J Prosthodont. 2017;30:437 -8.
clinically, shorter protocols are more prone to patient compli- 4. Lobbezoo F, van der Zaag J, van Selms MK, Hamburger HL,
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possible relationship between intensity and response to dif- and genetics: a review of the literature. J Oral Rehabil.
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the two variables were related from the beginning and empha- 7. Nissani M. A bibliographical survey of bruxism with special
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As for limitations, the authors consider that, because of electrical stimuli on temporalis EMG activity during sleep. J
the study flowchart in phases and long control periods, cali- Oral Rehabil 2008;35:171 -83.
bration could be different in the baseline week and the 23rd 9. American Academy of Sleep Medicine. International
week. Additionally, and although the study was conducted in Classification of Sleep Disorders, Revised: Diagnostic and
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