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. 2019 Jan 31;8(2):158. doi: 10.3390/jcm8020158

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Effects of NO training and/or Origanum majorana essential oil exposure (AE) on saliva MPO activity in bruxistic patients at sessions 1, 6, 12, 16, 21. # p < 0.05 vs Cont. * p < 0.05 vs bruxistic patients with “intrinsic stress” ST. Control (blue): control subjects (without stress) who are not trained with NO. AE: non bruxistic participants (Controls) that smelled a 1% Origanum majorana essential oil impregnated into nasal filters. ST (Bruxistic): trained bruxistic patients with “high intrinsic stress” (ST) during 21 NO sessions but exposure to Origanum majorana essential oil. ST (Bruxistic)-AE: Bruxistic patients with “high intrinsic stress” who smelled 1% Origanum majorana essential oil impregnated in nasal filters during 21 sessions of NO training.