Sandra Valéria Rancan

Publications (2)1.69 Total impact

• Article: Acupuncture and temporomandibular disorders: a 3-month follow-up EMG study.

  Sandra Valéria Rancan, César Bataglion, Solange Aparecida Bataglion, Odinê Maria Rêgo Bechara, Marisa Semprini, Selma Siéssere, João Paulo Machado de Sousa, José Alexandre de Souza Crippa, Jaime Eduardo Cecilio Hallak, Simone Cecilio Hallak Regalo
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  ABSTRACT: The purpose of this study was to investigate the levels of electromyographic (EMG) activation and maximal molar bite force before and after a 3-month acupuncture therapy in individuals with temporomandibular disorder (Helkimo Index) from a pool of subjects attending the Special Care Course of the Ribeirão Preto Dental School, São Paulo University, Brazil. All 17 patients, aged between 37 and 50 years (44.2 +/- 4.84 years), with an average weight of 71 +/- 9.45 kg and height of 1.64 +/- 0.07 m, were clinically examined with regard to pain and dysfunctions of the masticatory system. The temporomandibular acupuncture points of needling were IG4, E6, E7, B2, VB14, VB20, ID18, ID19, F3, E36, VB34, E44, R3, and HN3. EMG measures were acquired before and after the treatment using a MyoSystem-BR1 electromyographer. The data collected at rest, protrusion, left and right laterality, and clenching were normalized by maximum voluntary contraction. Maximal bite force in right and left molar regions were registered using a dynamometer with a capacity of up to 1000 N, adapted for oral conditions. The highest value out of three recordings was considered to be the individual's maximal bite force. The results were statistically analyzed using the paired t test (SPSS version 15.0) during the comparison before and after treatment. We found decreased EMG activity at rest, protrusion, left and right laterality, and clenching; as well as increased values of maximal bite force after acupuncture treatment. Acupuncture promoted alterations in the EMG activity of masticatory muscles, increased maximal molar bite force, and led to remission of the subjects' painful symptomatology.
  Journal of alternative and complementary medicine (New York, N.Y.) 12/2009; 15(12):1307-10. · 1.69 Impact Factor
• Source

  Available from: Plauto Watanabe

  Article: Electromyographic activity of masticatory muscles in women with osteoporosis.

  Selma Siéssere, Luiz Gustavo de Sousa, Naira de Albuquerque Lima, Marisa Semprini, Paulo Batista de Vasconcelos, Plauto Christopher Aranha Watanabe, Sandra Valéria Rancan, Simone Cecilio Hallak Regalo
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  ABSTRACT: The purpose of this study was to analyze the electromyographic (EMG) activity and the maximal molar bite force in women diagnosed with osteoporosis in the maxillary and mandibular regions, considering the habits and conditions that lead to development of generalized skeletal bone loss, including on face bones, can disturb the functional harmony of the stomatognathic system. Twenty-seven women with mandibular and maxillary osteoporosis and 27 healthy controls volunteered to participate in the study. A 5-channel electromyographer was used. Muscle activity was evaluated by means of EMG recordings of the masticatory musculature (masseter and temporalis muscles, bilaterally) during the following clinical conditions: rest (5 s); right and left lateral excursions (5 s); protrusion (5 s); maximal dental clenching on Parafilm (4 s) and maximal voluntary contraction (4 s). This latter clinical condition was used as the normalization factor of the sample data. It was observed that individuals with osteoporosis presented greater EMG activity when maintaining mandible posture conditions and less activity during dental clenching and when obtaining maximal molar bite force. It may be concluded that facial osteoporosis can interfere on the patterns of masticatory muscle activation and maximal bite force of the stomatognathic system.
  Brazilian dental journal 01/2009; 20(3):237-342.