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Stomatologija 2010; 12 (2): 51-55 425 KB

Electromyographic and cephalometric correlation with the predominant masticatory movement

Maria Julia P. Coelho-Ferraz, Fausto Berzin, Cesar Ferreira Amorim, Fabio Lourenco Romano, Dagmar de Paula Queluz

Summary

Objective: This study aimed to evaluate the chewing muscular dynamics and correlate the side of the masticatory movement that is more vertical and/or more horizontal established by the photomeasurement Masticatory Functional Angle (MFA) to the muscular activity behavior, showed in the surface electromyography and in the radiographic images.

Material and method: Seventeen people were selected of both genders, with the average age of 25 years, without signs or apparent symptoms of masticatory muscular disorders. The teleradiographies were done in lateral norm and surface electromyography of the masseter muscles, anterior portion of temporal and supra-hyoids in rest position and maximal bite. The bite force measured with a metallic transducer that was connected to a force sensor (Strain Gauge) to measure the deformation of the material model SF4 (EMG SYSTEM DO BRASIL). A mandibular goniometer of the EMG System of Brazil was used to measure the opening size. Results: The comparison and correlation were established between the groups with MFA>5° and MFA<5° by the test “t” of Student or test of Mann-Whitney conform the distribution was normal or not, respectively. The results showed significant differences between groups, although without sexual dimorphism, to masseter muscle in maximal bite.

Conclusion: In conclusion, the anatomic-physiological aspects of temporomandibular disorders are related to the asymmetrical mandible function.

Key words: mandible biomechanics, electromyography, cephalometry.

Received: 12 12 2008

Accepted for publishing: 21 06 2010

Maria Julia P. Coelho-Ferraz – researcher, Department of Social Dentistry of Piracicaba Dental School UNICAMP, São Paulo, Brazil
Fausto Berzin – Professor and Department Chair, Department of Morphology, Piracicaba Dental School, UNICAMP, São Paulo, Brazil
Cesar Amorim – Engineering, São José dos Campos, São Paulo, Brazil
Fabio Lourenco Romano – Master and PHD Student, Department of Orthodontics, Piracicaba Dental School UNICAMP, São Paulo, Brazil; Professor of Orthodontics, Dental School of Federal University of Alfenas, Minas Gerais, Brazil
Dagmar de Paula Queluz – Professor, Department of Social Dentistry of Piracicaba Dental School UNICAMP, São Paulo, Brazil

Address correspondence to Maria Julia P. Coelho-Ferraz, Alameda João Senra, 148, Colinas de São João, Limeira – SP, Brasil 13481-299.
E-mail address: mjcoelhoferraz@hotmail.com



	Baltic Dental and Maxillofacial Journal

June, 2010, Vol. 12, No. 2 CONTENTS SCIENTIFIC ARTICLES Flapless surgery and immediately loaded implants: A retrospective comparison between implantation with and without computer-assisted planned surgical stent Matteo Danza, Francesco Carinci 35-41 Technical aspects of endodontic treatment procedures among Lithuanian general dental practitioners Vytaute Peciuliene, Jurate Rimkuviene, Jolanta Aleksejuniene, Markus Haapasalo, Saulius Drukteinis, Rasmute Maneliene 42-50 Electromyographic and cephalometric correlation with the predominant masticatory movement Maria Julia P. Coelho-Ferraz, Fausto Berzin, Cesar Ferreira Amorim, Fabio Lourenco Romano, Dagmar de Paula Queluz 51-55 The impact of salivary mutans streptococci and sugar consumption on caries experience in 6-year olds and 12-year olds in Riga Jekaterina Gudkina, Anda Brinkmane 56-59 REVIEW Changes in oral health-related quality of life among children following dental treatment under general anaesthesia. A systematic review Birute Jankauskiene, Julija Narbutaite 60-64 © 2010 Stomatologija		Stomatologija 2010; 12 (2): 51-55 425 KB Electromyographic and cephalometric correlation with the predominant masticatory movement Maria Julia P. Coelho-Ferraz, Fausto Berzin, Cesar Ferreira Amorim, Fabio Lourenco Romano, Dagmar de Paula Queluz Summary Objective: This study aimed to evaluate the chewing muscular dynamics and correlate the side of the masticatory movement that is more vertical and/or more horizontal established by the photomeasurement Masticatory Functional Angle (MFA) to the muscular activity behavior, showed in the surface electromyography and in the radiographic images. Material and method: Seventeen people were selected of both genders, with the average age of 25 years, without signs or apparent symptoms of masticatory muscular disorders. The teleradiographies were done in lateral norm and surface electromyography of the masseter muscles, anterior portion of temporal and supra-hyoids in rest position and maximal bite. The bite force measured with a metallic transducer that was connected to a force sensor (Strain Gauge) to measure the deformation of the material model SF4 (EMG SYSTEM DO BRASIL). A mandibular goniometer of the EMG System of Brazil was used to measure the opening size. Results: The comparison and correlation were established between the groups with MFA>5° and MFA<5° by the test “t” of Student or test of Mann-Whitney conform the distribution was normal or not, respectively. The results showed significant differences between groups, although without sexual dimorphism, to masseter muscle in maximal bite. Conclusion: In conclusion, the anatomic-physiological aspects of temporomandibular disorders are related to the asymmetrical mandible function. Key words: mandible biomechanics, electromyography, cephalometry. Received: 12 12 2008 Accepted for publishing: 21 06 2010 Maria Julia P. Coelho-Ferraz – researcher, Department of Social Dentistry of Piracicaba Dental School UNICAMP, São Paulo, Brazil Fausto Berzin – Professor and Department Chair, Department of Morphology, Piracicaba Dental School, UNICAMP, São Paulo, Brazil Cesar Amorim – Engineering, São José dos Campos, São Paulo, Brazil Fabio Lourenco Romano – Master and PHD Student, Department of Orthodontics, Piracicaba Dental School UNICAMP, São Paulo, Brazil; Professor of Orthodontics, Dental School of Federal University of Alfenas, Minas Gerais, Brazil Dagmar de Paula Queluz – Professor, Department of Social Dentistry of Piracicaba Dental School UNICAMP, São Paulo, Brazil Address correspondence to Maria Julia P. Coelho-Ferraz, Alameda João Senra, 148, Colinas de São João, Limeira – SP, Brasil 13481-299. E-mail address: mjcoelhoferraz@hotmail.com