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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Evaluation of silent period on masticatory cycles of different muscles in dentate oral contraceptives users and nonusers</title><author><name sortKey="Turcio, Karina Helga Leal" sort="Turcio, Karina Helga Leal" uniqKey="Turcio K" first="Karina Helga Leal" last="Turcio">Karina Helga Leal Turcio</name><affiliation><nlm:aff id="aff1">Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP – Univ Estadual Paulista, São Paulo, Brazil</nlm:aff></affiliation></author><author><name sortKey="Garcia, Alicio Rosalino" sort="Garcia, Alicio Rosalino" uniqKey="Garcia A" first="Alício Rosalino" last="Garcia">Alício Rosalino Garcia</name><affiliation><nlm:aff id="aff1">Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP – Univ Estadual Paulista, São Paulo, Brazil</nlm:aff></affiliation></author><author><name sortKey="Zuim, Paulo Renato Junqueira" sort="Zuim, Paulo Renato Junqueira" uniqKey="Zuim P" first="Paulo Renato Junqueira" last="Zuim">Paulo Renato Junqueira Zuim</name><affiliation><nlm:aff id="aff1">Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP – Univ Estadual Paulista, São Paulo, Brazil</nlm:aff></affiliation></author><author><name sortKey="Moreno, Amalia" sort="Moreno, Amalia" uniqKey="Moreno A" first="Amália" last="Moreno">Amália Moreno</name><affiliation><nlm:aff id="aff1">Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP – Univ Estadual Paulista, São Paulo, Brazil</nlm:aff></affiliation></author><author><name sortKey="Goiato, Marcelo Coelho" sort="Goiato, Marcelo Coelho" uniqKey="Goiato M" first="Marcelo Coelho" last="Goiato">Marcelo Coelho Goiato</name><affiliation><nlm:aff id="aff1">Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP – Univ Estadual Paulista, São Paulo, Brazil</nlm:aff></affiliation></author><author><name sortKey="Guiotti, Aimee Maria" sort="Guiotti, Aimee Maria" uniqKey="Guiotti A" first="Aimée Maria" last="Guiotti">Aimée Maria Guiotti</name><affiliation><nlm:aff id="aff1">Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP – Univ Estadual Paulista, São Paulo, Brazil</nlm:aff></affiliation></author><author><name sortKey="Dos Santos, Daniela Micheline" sort="Dos Santos, Daniela Micheline" uniqKey="Dos Santos D" first="Daniela Micheline" last="Dos Santos">Daniela Micheline Dos Santos</name><affiliation><nlm:aff id="aff1">Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP – Univ Estadual Paulista, São Paulo, Brazil</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">26038645</idno><idno type="pmc">4439841</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4439841</idno><idno type="RBID">PMC:4439841</idno><idno type="doi">10.4103/1305-7456.156793</idno><date when="2015">2015</date><idno type="wicri:Area/Pmc/Corpus">000281</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000281</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Evaluation of silent period on masticatory cycles of different muscles in dentate oral contraceptives users and nonusers</title><author><name sortKey="Turcio, Karina Helga Leal" sort="Turcio, Karina Helga Leal" uniqKey="Turcio K" first="Karina Helga Leal" last="Turcio">Karina Helga Leal Turcio</name><affiliation><nlm:aff id="aff1">Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP – Univ Estadual Paulista, São Paulo, Brazil</nlm:aff></affiliation></author><author><name sortKey="Garcia, Alicio Rosalino" sort="Garcia, Alicio Rosalino" uniqKey="Garcia A" first="Alício Rosalino" last="Garcia">Alício Rosalino Garcia</name><affiliation><nlm:aff id="aff1">Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP – Univ Estadual Paulista, São Paulo, Brazil</nlm:aff></affiliation></author><author><name sortKey="Zuim, Paulo Renato Junqueira" sort="Zuim, Paulo Renato Junqueira" uniqKey="Zuim P" first="Paulo Renato Junqueira" last="Zuim">Paulo Renato Junqueira Zuim</name><affiliation><nlm:aff id="aff1">Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP – Univ Estadual Paulista, São Paulo, Brazil</nlm:aff></affiliation></author><author><name sortKey="Moreno, Amalia" sort="Moreno, Amalia" uniqKey="Moreno A" first="Amália" last="Moreno">Amália Moreno</name><affiliation><nlm:aff id="aff1">Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP – Univ Estadual Paulista, São Paulo, Brazil</nlm:aff></affiliation></author><author><name sortKey="Goiato, Marcelo Coelho" sort="Goiato, Marcelo Coelho" uniqKey="Goiato M" first="Marcelo Coelho" last="Goiato">Marcelo Coelho Goiato</name><affiliation><nlm:aff id="aff1">Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP – Univ Estadual Paulista, São Paulo, Brazil</nlm:aff></affiliation></author><author><name sortKey="Guiotti, Aimee Maria" sort="Guiotti, Aimee Maria" uniqKey="Guiotti A" first="Aimée Maria" last="Guiotti">Aimée Maria Guiotti</name><affiliation><nlm:aff id="aff1">Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP – Univ Estadual Paulista, São Paulo, Brazil</nlm:aff></affiliation></author><author><name sortKey="Dos Santos, Daniela Micheline" sort="Dos Santos, Daniela Micheline" uniqKey="Dos Santos D" first="Daniela Micheline" last="Dos Santos">Daniela Micheline Dos Santos</name><affiliation><nlm:aff id="aff1">Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP – Univ Estadual Paulista, São Paulo, Brazil</nlm:aff></affiliation></author></analytic><series><title level="j">European Journal of Dentistry</title><idno type="ISSN">1305-7456</idno><idno type="eISSN">1305-7464</idno><imprint><date when="2015">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec id="st1"><title>Objective:</title><p>The aim of this study was to evaluate the influence of oral contraceptive use on the silent period (SP) of anterior temporal and masseter muscles during the menstrual cycle.</p></sec><sec id="st2"><title>Materials and Methods:</title><p>Totally, 28 women on reproductive age were selected including 15 nonusers of any hormone and 13 contraceptive users. All patients were dentate without muscular temporomandibular disorders. Electromyography (SP test) of the anterior temporal and masseter muscles was conducted every week during three consecutive menstrual cycles at 1<sup>st</sup> day of menstruation (P<sub>1</sub>), 7<sup>th</sup> day (P<sub>2</sub>), 14<sup>th</sup> day (P<sub>3</sub>) and 21<sup>st</sup> day (P<sub>4</sub>).</p></sec><sec id="st3"><title>Results:</title><p>The SP values in the anterior temporal and masseter muscles were measured at both sides. The SP values of the right side (13.49 ms) at P<sub>2</sub> were significantly different compared to the left side (12.28 ms). However, there was no significant difference on the interactions among the three factors.</p></sec><sec id="st4"><title>Conclusion:</title><p>It can be concluded that the SP values in healthy women in reproductive age may not be influenced by the menstrual cycle with similar results for both muscles.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Kemsley, Ek" uniqKey="Kemsley E">EK Kemsley</name></author><author><name sortKey="Defernez, M" uniqKey="Defernez M">M Defernez</name></author><author><name sortKey="Sprunt, Jc" uniqKey="Sprunt J">JC Sprunt</name></author><author><name sortKey="Smith, Ac" uniqKey="Smith A">AC Smith</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Corsi, Fm" uniqKey="Corsi F">FM Corsi</name></author><author><name sortKey="Fausti, S" uniqKey="Fausti S">S Fausti</name></author><author><name sortKey="Serrao, M" uniqKey="Serrao M">M Serrao</name></author><author><name 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Eur J Dent</journal-id><journal-id journal-id-type="iso-abbrev">Eur J Dent</journal-id><journal-id journal-id-type="publisher-id">EJD</journal-id><journal-title-group><journal-title>European Journal of Dentistry</journal-title></journal-title-group><issn pub-type="ppub">1305-7456</issn><issn pub-type="epub">1305-7464</issn><publisher><publisher-name>Medknow Publications & Media Pvt Ltd</publisher-name><publisher-loc>India</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">26038645</article-id><article-id pub-id-type="pmc">4439841</article-id><article-id pub-id-type="publisher-id">EJD-9-171</article-id><article-id pub-id-type="doi">10.4103/1305-7456.156793</article-id><article-categories><subj-group subj-group-type="heading"><subject>Original Article</subject></subj-group></article-categories><title-group><article-title>Evaluation of silent period on masticatory cycles of different muscles in dentate oral contraceptives users and nonusers</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Turcio</surname><given-names>Karina Helga Leal</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author"><name><surname>Garcia</surname><given-names>Alício Rosalino</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author"><name><surname>Zuim</surname><given-names>Paulo Renato Junqueira</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author"><name><surname>Moreno</surname><given-names>Amália</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author"><name><surname>Goiato</surname><given-names>Marcelo Coelho</given-names></name><xref ref-type="aff" rid="aff1">1</xref><xref ref-type="corresp" rid="cor1"></xref></contrib><contrib contrib-type="author"><name><surname>Guiotti</surname><given-names>Aimée Maria</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author"><name><surname>dos Santos</surname><given-names>Daniela Micheline</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib></contrib-group><aff id="aff1"><label>1</label>Department of Dental Materials and Prosthodontics, Faculdade de Odontologia de Araçatuba, Araçatuba Dental School, UNESP – Univ Estadual Paulista, São Paulo, Brazil</aff><author-notes><corresp id="cor1"><bold>Correspondence:</bold> Dr. Marcelo Coelho Goiato Email: <email xlink:href="goiato@foa.unesp.br">goiato@foa.unesp.br</email></corresp></author-notes><pub-date pub-type="ppub"><season>Apr-Jun</season><year>2015</year></pub-date><volume>9</volume><issue>2</issue><fpage>171</fpage><lpage>175</lpage><permissions><copyright-statement>Copyright: © European Journal of Dentistry</copyright-statement><copyright-year>2015</copyright-year><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc-sa/3.0"><license-p>This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p></license></permissions><abstract><sec id="st1"><title>Objective:</title><p>The aim of this study was to evaluate the influence of oral contraceptive use on the silent period (SP) of anterior temporal and masseter muscles during the menstrual cycle.</p></sec><sec id="st2"><title>Materials and Methods:</title><p>Totally, 28 women on reproductive age were selected including 15 nonusers of any hormone and 13 contraceptive users. All patients were dentate without muscular temporomandibular disorders. Electromyography (SP test) of the anterior temporal and masseter muscles was conducted every week during three consecutive menstrual cycles at 1<sup>st</sup> day of menstruation (P<sub>1</sub>), 7<sup>th</sup> day (P<sub>2</sub>), 14<sup>th</sup> day (P<sub>3</sub>) and 21<sup>st</sup> day (P<sub>4</sub>).</p></sec><sec id="st3"><title>Results:</title><p>The SP values in the anterior temporal and masseter muscles were measured at both sides. The SP values of the right side (13.49 ms) at P<sub>2</sub> were significantly different compared to the left side (12.28 ms). However, there was no significant difference on the interactions among the three factors.</p></sec><sec id="st4"><title>Conclusion:</title><p>It can be concluded that the SP values in healthy women in reproductive age may not be influenced by the menstrual cycle with similar results for both muscles.</p></sec></abstract><kwd-group><kwd>Computerized dentistry</kwd><kwd>menstrual cycle</kwd><kwd>electromyography</kwd><kwd>silent period</kwd><kwd>sexual hormones</kwd></kwd-group></article-meta></front><body><sec sec-type="intro" id="sec1-1"><title>INTRODUCTION</title><p>Electromyography (EMG) allows evaluation of the masticatory system through record of muscular electrical current during resting, chewing and tooth clenching.[<xref rid="ref1" ref-type="bibr">1</xref>] The silent period (SP) represents a reduced electromyographic activity that induces voluntary muscular activity through magnetic transcranial stimulation in the primary motor cortex analyzed by EMG.[<xref rid="ref2" ref-type="bibr">2</xref><xref rid="ref3" ref-type="bibr">3</xref>] In the elevator muscles of the mandible, the SP begins after functional dental contact or stimulus in the oral and periodontal region during muscular contraction.[<xref rid="ref4" ref-type="bibr">4</xref>] Thus, the SP can be induced by the release of sudden stress in the muscle, percussion on the chin, voluntary and rhythmic dental contact, and electrical stimulus.[<xref rid="ref5" ref-type="bibr">5</xref><xref rid="ref6" ref-type="bibr">6</xref>]</p><p>The SP might be influenced by patient's age as well as deficient occlusion, tooth loss, and emotional behavior.[<xref rid="ref7" ref-type="bibr">7</xref>] Some studies have suggested that the SP is an important factor for evaluation of neuropathies and motor deficiency.[<xref rid="ref8" ref-type="bibr">8</xref>] The researchers demonstrated that the SP could be an auxiliary exam for diagnosis of functional disturbance as a correlation between period length and symptoms severity.[<xref rid="ref9" ref-type="bibr">9</xref>] However, only one long SP should not be related to muscular pain.</p><p>Several etiological factors may be related to symptom of temporomandibular dysfunctions.[<xref rid="ref10" ref-type="bibr">10</xref><xref rid="ref11" ref-type="bibr">11</xref>] Some previous studies[<xref rid="ref12" ref-type="bibr">12</xref><xref rid="ref13" ref-type="bibr">13</xref>] also presented the influence of sexual hormones on the development of joint and muscular alterations. The effect of estrogen on the masticatory system depends on the amount of estrogen receptors present in muscles and joints.[<xref rid="ref12" ref-type="bibr">12</xref>] In this sense, some studies showed a difference on pain modulation during the menstrual cycle[<xref rid="ref14" ref-type="bibr">14</xref>] and in contraceptive users.[<xref rid="ref13" ref-type="bibr">13</xref>] Although there is a study about the electrical performance of masticatory muscles during the menstrual cycle was found,[<xref rid="ref15" ref-type="bibr">15</xref>] it did not mention SPs of the muscles.</p><p>Thus, the aim of this study was to evaluate the SP on masticatory cycle of two elevator muscles of the mandible during the menstrual cycle of dentate female patients using oral contraceptive (OC) or not. The research hypothesis assumed that the SP on masticatory cycles would be different regarding muscles, OCs users and nonusers, and menstrual period.</p></sec><sec sec-type="methods" id="sec1-2"><title>METHODS</title><sec id="sec2-1"><title>Sample</title><p>Amongst 342 female students of the Araçatuba Dental School-São Paulo State University-Brazil, 30 women were selected after initial exam including anamnesis and clinical evaluation. Half of the sample was not taking any sexual hormone (G1) while the other half (G2) was using some type of hormone. Two women of G2 did not return to the appointments, totalizing 28 patients. The inclusion criteria assumed female patients in reproductive age between 18 and 32 years old and also users and nonusers of some OC (estrogen and/or progesterone hormones) to avoid pregnancy, as confirmed by the volunteer's physician. The G1 patients should present regular menstrual cycles (28 ± 3 days) without taking OCs for at least 3 months. The G2 patients were taking low-dose pills for at least 3 months in a cycle of 21 days for active medication followed by 7 days without active medication. The exclusion criteria were signs and symptoms of temporomandibular disorders (TMD), as confirmed by the Dworkin and Leresche Research Diagnostic Criteria for TMD;[<xref rid="ref16" ref-type="bibr">16</xref>] presence of systemic pathology; pregnancy during the study; more than one tooth loss in each quadrant (excluding third molar); orthodontic treatment; presence of occlusal interference on the opposite side of mastication; symptoms on muscle palpation; and patients submitted to dental treatment including alteration of occlusion as well as prostheses and restorations.</p><p>The patients were informed about the experiment and signed an informed consent form in accordance with the recommendations of the Committee on Ethics in Human Research, which approved the study.</p></sec><sec id="sec2-2"><title>Menstrual cycles monitoring</title><p>All female students were observed every week during three consecutive menstrual cycles and the exams initiated on the 1<sup>st</sup> day of the cycle of each month. The menstrual cycle was divided into four distinct phases at 1<sup>st</sup> day of menstruation to 2 days after (P<sub>1</sub>), 7<sup>th</sup> day ± 2 days (P<sub>2</sub>), 14<sup>th</sup> day ± 2 days (P<sub>3</sub>) and 21<sup>st</sup> day ± 2 days (P<sub>4</sub>).[<xref rid="ref17" ref-type="bibr">17</xref>] The patients were instructed to avoid any analgesic medication before exams. Women who were not on OC group predicted their ovulation using the ClearPlan ovulation prediction kit (ClearPlan Easy, Unipath Research, Princeton, NJ, US). The patients received enough kits for the first cycle.</p></sec><sec id="sec2-3"><title>Electromyography measurements</title><p>The EMG was measured every week according to the menstrual cycle phases using bipolar surface electrodes (Bio Research, Redmond, WA, US) with 10 mm in diameter. A 21 mm interelectrode distance was determined and the electrodes were connected to an amplifier by cables that were attached to a computer using the Bio Research “Bio EMG” software to capture the electrical signal and analyze the muscular electrical activity. The test was conducted at sampling rate of 1000 Hz during 15 s using 1X amplification. The electrodes were positioned based on palpation of the muscles at 1.5–2.0 cm superior to the zygomatic arch, immediately behind the frontal process of the zygomatic bone.[<xref rid="ref18" ref-type="bibr">18</xref>] The evaluation was conducted bilaterally over dry skin parallel to the masseter and temporal muscle fibers. The center part of the masseter muscle was localized at the point equidistant to the upper and lower insertions of the muscle with teeth in occlusal contact. For the temporal muscle, the anterior border was located during mandibular movement to place the electrode perpendicular to the sagittal plane.</p><p>The SP values were obtained in open-close-clench-chewing cycles. This cycle is defined as a cycle when a subject firmly closes the mouth from the open mouth position with teeth in the habitual occlusal position during the chewing cycle. Masticatory performance was carried out using a raisin.[<xref rid="ref19" ref-type="bibr">19</xref>] Each subject chewed the food for 35 cycles, which is very close to the moment of deglutition, and each cycle corresponded to the maximum bite chewing performed for each subject to grind the food. Eight subsequent cycles of SP were recorded for each subject among the 35 cycles.[<xref rid="ref20" ref-type="bibr">20</xref><xref rid="ref21" ref-type="bibr">21</xref>] SP measurements were obtained 3 times in each subject for each chewing cycle and the mean was calculated in milliseconds (ms). The SP length was measured using the double-zoom option with error about 1.2 ms. The measurement considered the peak of the last significant spike preceding the inhibition to the peak of the first significant spike being part of the ongoing muscle activity. In case of SP with two or three inhibitory pauses (double or triple SP) or depressed muscle activity after complete inhibition of motor neurons, the length of all inhibitory pauses was measured or added to the duration of a depressed activity after the last inhibitory pause.[<xref rid="ref4" ref-type="bibr">4</xref>] During the SP records, the subjects were kept in a comfortable sitting position without headrest and with the Frankfort horizontal plane parallel to the floor.</p></sec><sec id="sec2-4"><title>Statistical analyses</title><p>All statistical analyses were conducted using the SPSS version 19.0 statistical software (SPSS Inc., Chicago, USA). The normality of SP values was assessed by Shapiro-Wilks’ W-test. A four-way repeated measures analysis of variance (ANOVA) was performed to verify any significant difference regarding muscle, side, group, and period. The means were compared by Tukey Honestly Significant Difference test (α =0.05) <italic>post hoc</italic> test.</p></sec></sec><sec sec-type="results" id="sec1-3"><title>RESULTS</title><p><xref ref-type="table" rid="T1">Table 1</xref> shows the means and standard deviations of the SP values for each period of analysis. All groups exhibited similar SP value over time [<xref ref-type="table" rid="T1">Table 1</xref>]. <xref ref-type="table" rid="T2">Table 2</xref> shows the results of four-way repeated measures ANOVA. Although side and period statistically affected the SP values (<italic>P</italic> = 0.03, ANOVA) [<xref ref-type="table" rid="T2">Table 2</xref>], there was no statistically significant difference on the interaction among the factors (muscle × side × group × period) (<italic>P</italic> > 0.05, ANOVA) [<xref ref-type="table" rid="T2">Table 2</xref>]. For the interaction between side and period, the SP values of the right side (13.49 ms) were different from the left side (12.28 ms) at P<sub>2</sub>, regardless group and muscle (<italic>P</italic> < 0.05) [<xref ref-type="table" rid="T3">Table 3</xref>].</p><table-wrap id="T1" position="float"><label>Table 1</label><caption><p>Mean values (SDs) of SP (ms) of the sample</p></caption><graphic xlink:href="EJD-9-171-g001"></graphic></table-wrap><table-wrap id="T2" position="float"><label>Table 2</label><caption><p>Four-way repeated measures ANOVA</p></caption><graphic xlink:href="EJD-9-171-g002"></graphic></table-wrap><table-wrap id="T3" position="float"><label>Table 3</label><caption><p>Mean values (SDs) of SP (ms) for each side and period, regardless group and muscle</p></caption><graphic xlink:href="EJD-9-171-g003"></graphic></table-wrap></sec><sec sec-type="discussion" id="sec1-4"><title>DISCUSSION</title><p>Electromyography has been used to evaluate muscular alterations considering that SP represents the functional state of the neuromuscular system. The research hypothesis was partially accepted assuming the difference in SP between side and period of analysis. Celebic <italic>et al</italic>.[<xref rid="ref4" ref-type="bibr">4</xref>] found mean SP values between 12.5 and 12.9 ms in healthy individuals during tooth clenching. McNamara <italic>et al</italic>.[<xref rid="ref22" ref-type="bibr">22</xref>] showed mean SP from 9.21 to 11.5 ms in healthy patients during dental percussion and chewing while Watt <italic>et al</italic>.[<xref rid="ref23" ref-type="bibr">23</xref>] reported higher SP during occlusion.</p><p>Chewing is a complex and rhythmic physiological process of mandible that requires interaction between receptors and nerves to control bone, joints and muscles of the stomatognathic system.[<xref rid="ref21" ref-type="bibr">21</xref>] In the present study, the SP was evaluated through tooth contact during chewing considering the three steps of the chewing cycle (open-close-clench). It has been suggested that masseter presents the highest strength and electrical activity during food grinding.[<xref rid="ref24" ref-type="bibr">24</xref><xref rid="ref25" ref-type="bibr">25</xref>] On the other hand, the temporal muscle is effective for the most accurate mandibular movements, such as laterality.[<xref rid="ref22" ref-type="bibr">22</xref><xref rid="ref23" ref-type="bibr">23</xref>] However, the present study did not find a significant difference between those muscles since the structural composition and functional characteristics may change as an adaptation to functional requirements.[<xref rid="ref24" ref-type="bibr">24</xref>] In this sense, some authors confirmed that strengthening and stretching exercises might cause alterations in muscular properties[<xref rid="ref20" ref-type="bibr">20</xref><xref rid="ref26" ref-type="bibr">26</xref><xref rid="ref27" ref-type="bibr">27</xref>] because of higher tolerance to stretching or biomolecular structural alterations that may change with gender.[<xref rid="ref28" ref-type="bibr">28</xref>]</p><p>It is important to emphasize that mastication may occur on both sides simultaneously or alternately, but it is important to consider that the majority of people chew more on one particular side that is, they have a preferred chewing side (PCS).[<xref rid="ref29" ref-type="bibr">29</xref><xref rid="ref30" ref-type="bibr">30</xref><xref rid="ref31" ref-type="bibr">31</xref>] This preference may be influenced by occlusion, pain, hemispheric laterality and other factors.[<xref rid="ref32" ref-type="bibr">32</xref><xref rid="ref33" ref-type="bibr">33</xref>] Chewing is an exercise for the muscles of mastication, and the preference for one side may stimulate this side more intensively. Although in the present study, preferred side of chewing of the voluntaries has not been determined, we could speculate that the difference between sides at P<sub>2</sub> could be probably due to a stimulus generated by periodontal or muscular receptors important for SP.[<xref rid="ref34" ref-type="bibr">34</xref><xref rid="ref35" ref-type="bibr">35</xref>] It should be necessary more studies to investigate this subject.</p><p>Furthermore, we can suppose that the hormonal alterations at P<sub>2</sub> probably influenced the muscular activity during SP, the OCs did not affect the muscular function [Tables <xref ref-type="table" rid="T2">2</xref> and <xref ref-type="table" rid="T3">3</xref>]. In addition, it is important to consider the direct influence of occlusion on the masticatory standard considering the alterations in muscular contraction during food grinding.[<xref rid="ref36" ref-type="bibr">36</xref>]</p><p>For the OCs, previous studies[<xref rid="ref12" ref-type="bibr">12</xref><xref rid="ref13" ref-type="bibr">13</xref><xref rid="ref37" ref-type="bibr">37</xref>] observed that hormonal alterations in women change muscular physiology. Although the level of sexual hormones reduces during the menstrual cycle, especially estrogen,[<xref rid="ref38" ref-type="bibr">38</xref>] there was no significant difference between the group and the menstrual period [<xref ref-type="table" rid="T2">Table 2</xref>]. In addition, additional factors such as stress, structural alterations in muscles and joint, occlusion and parafunctional habits also influence the physiopathology of the stomatognathic system in female patients.</p></sec><sec sec-type="conclusion" id="sec1-5"><title>CONCLUSION</title><p>According to the results of the present study, it was concluded that the physiological, hormonal alterations during the menstrual cycle in OC users and nonusers do not affect the SP in healthy patients. 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