A. Ogalde

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

International journal of science and research, Sep 4, 2023

Aim: To evaluate the impact of the craniofacial architecture according to the ANB angle corrected... more 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.

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

IJSR, 2023

Aim: To evaluate the impact of the craniofacial architecture according to the ANB angle corrected... more 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.

format_quoteThe Miralles-corrected ANB angle displayed lower variance in skeletal classifications compared to Steiner's method, enhancing diagnostic stability.format_quote

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Radiographic and electromiographic study of masseter and temporal anterior muscles in subjects with angle ii, i malloclusion and controls [Estudio radiográfico y electromiográfico de los músculos masetero y temporal anterior en individuos con maloclusión tipo ii, 1 de angle y controles]

Relationship Between Occlusion and EMG Activity of the Masseter Muscles During Clenching at Maximal Intercuspal Position: A Comparative Study Between Prognathics and Controls

CRANIO®, 2002

In the prognathic (P) patient group clenching at maximal intercuspal position (MIP), we found tha... more In the prognathic (P) patient group clenching at maximal intercuspal position (MIP), we found that the Ar-Go-Me angle is greater than in the control group (C = 120.9 degrees +/- 7 degrees vs. P = 134.4 degrees +/- 5.2 degrees): the same as the masseter fibers angle (alpha). The average EMG voltage class was similar in both groups (C = 1488.5 +/- 303.4 microvolt vs. P = 1317.6 +/- 293.4 microvolt). The mean total number of contact points in tooth arches was greater in the control group than in the patient group (C = 5.77 +/- 0.43 vs. P = 3.07 +/- 0.29), and there was a greater number of contact points between both premolar and molar areas. Both the control group and the patient group showed balanced occlusion in the premolar and molar areas. Therefore the finding of a similar mean EMG value between the control group and the patients emphasizes the importance of balanced contact points in the posterior areas.

Estudio Radiográfico y Electromiográfico de los Músculos Masetero y Temporal Anterior en Individuos con Maloclusión Tipo II, 1 de Angle y Controles

International Journal of Morphology, 2009

RESUMEN: El objetivo de este estudio fue comparar la actividad electromiográfica (EMG) de los mús... more RESUMEN: El objetivo de este estudio fue comparar la actividad electromiográfica (EMG) de los músculos Masetero (Ms) y Temporal anterior (Ta) de sujetos portadores de maloclusión Angle II, 1 y controles. Se seleccionaron 19 sujetos estudiantes universitarios con características antropométricas similares (edad, peso, talla e IMC). Clínica y radiográficamente se dividieron en dos grupos: Grupo Control (GC) individuos portadores de neutroclusión y Grupo Disto (GD) con individuos portadores de maloclusión Tipo II, 1 de Angle. Se les realizó una electromiografía de superficie (EMG) de acuerdo a la técnica de Ferrario et al. (1993) y se analizaron los datos a partir de Root Mean Square (RMS). A partir de este registro se analizaron la amplitud media de voltaje (mV), la relación Ms/Ta y la distribución de las clases de voltaje, determinadas por los potenciales de acción de unidades motoras (PAUM). De la telerradiografía se analizaron los siguientes datos: ANB, SNA, SNB según Steiner (1992), relación molar, ángulo alfa de inclinación del Ms y brazo de palanca de acuerdo al modelo de Throkcmorton et al. (1980). Se utilizó Test "t" Student para evaluar significancia estadística (p<0,05) entre los grupos. La amplitud de voltaje fue mayor en el GD para todos los músculos estudiados (p<0,05). La relación Ms/Ta fue mayor en el GC. El ángulo alfa fue mayor en GD, también el brazo de palanca. La distribución de PAUM fue mayor en GC (79,0%), que en GD (57,8%) (p<0,05). GD presenta mayor amplitud de voltaje que GC, probablemente por presentar menos aferencias inhibitorias periodontales. También GD presenta una menor variedad de PAUM lo que implica que tiene menos reserva funcional que GC. PALABRAS CLAVE: Electromiografía; Músculos masetero y temporal anterior; Maloclusión Tipo II, 1 de Angle.

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Frecuencia de pseudoprognatismo y actividad del músculo masetero en pacientes fisurados

Revista médica de Chile, 2000

... Armando Ogalde L 1 , Hernán Cárdenas A 2 , José González N 3 , Héctor Montoya S 3. ... se hiz... more

Electrical stimulation of mental nerve to produce inhibitory action in bruxism treatment

Electronics Letters, 2013

Bruxism is an excessive clenching and involuntary parafunctional grinding of the teeth during sle... more Bruxism is an excessive clenching and involuntary parafunctional grinding of the teeth during sleep. It can cause damage to dental structures and temporomandibular joint dysfunction. An evaluation was performed on the effects over the masseter and temporalis anterior muscles in subjects with and without bruxism when electrical stimulation is applied to the right mental nerve. The results showed that, on average, the percentage decrease in the bruxist group for the right masseter was 25.02% and for the left masseter 25.87%. These results indicate that the inhibitory system produces an important decrease in the electrical activity of the two muscles, so it is a good starting point for a possible treatment in patients with bruxism and to develop new electronic stimulators.

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Electrical stimulation of mental nerve to produce inhibitory action in bruxism treatment

by P. Aqueveque and A. Ogalde

Electronics Letters, 2013

ABSTRACT Bruxism is an excessive clenching and involuntary parafunctional grinding of the teeth d... more ABSTRACT Bruxism is an excessive clenching and involuntary parafunctional grinding of the teeth during sleep. It can cause damage to dental structures and temporomandibular joint dysfunction. An evaluation was performed on the effects over the masseter and temporalis anterior muscles in subjects with and without bruxism when electrical stimulation is applied to the right mental nerve. The results showed that, on average, the percentage decrease in the bruxist group for the right masseter was 25.02% and for the left masseter 25.87%. These results indicate that the inhibitory system produces an important decrease in the electrical activity of the two muscles, so it is a good starting point for a possible treatment in patients with bruxism and to develop new electronic stimulators.

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