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Research Paper | Dentistry | Chile | Volume 12 Issue 9, September 2023 | Popularity: 5.2 / 10

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Study of the Impact of the Skeletal Facial Type on the Electromyographic Masseter / Temporal Ratio

Armando Ogalde Lamatta

Abstract: Aim: To evaluate the impact of the craniofacial architecture according to the ANB angle corrected by Miralles on the EMG activity of the masseter (Ms) and anterior temporal (Ta) muscles. Method: 62 individuals aged ranged 18 - 23 years, distributed by gender (24 men, 38 women), were studied. The facial morphology, according to Miralles, was determined from a lateral radiograph. All individuals underwent bilateral EMG examinations for the Ms and Ta muscles. Results: In the total sample, Ms presented a significant difference in voltage amplitude (p <0.001) greater than that of Ta on both sides. When distributing the sample among different facial skeletal types (normo, disto, and mesio), the dominance of the Ms was greater in the normo group. The Ms/Ta ratio also preserves the predominance of Ms in the normo group (1.74-1.54) on the left and right sides, respectively, without showing significant asymmetry. The vertex of the polynomial linear regression of the Ms/Ta ratio and the voltage amplitude is compatible with the normo group (approx. 1.69-1.45). The percentage of dominance of Ms (Ms/Ta ratio > 1) reached 80% in the normo group. This percentage was lower in disto and mesio groups. Conclusions: The ANB angle, EMG, and the Ms/Ta voltage ratio represent useful tools to explore the function of Ms and Ta in different skeletal types. The Ms/Ta ratio is close to 1.5, which represents the synergistic working ratio between the Ms and Ta muscles for the normo group.

Keywords: ANB, EMG, SNA

Edition: Volume 12 Issue 9, September 2023

Pages: 2096 - 2103

DOI: https://www.doi.org/10.21275/SR23902062410

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