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Masticatory muscle activity evaluation by electromyography in subjects with zygomatic implants
M de Rossi1, M Palinkas, B de Lima-Lucas
1Avenida do Café, s/n, School of Dentistry of Ribeirão Preto, University of São Paulo, 14040-904 Ribeirão Preto, São Paulo, Brazil, palinkas@usp.br.
Medicina Oral, Patologia Oral Y Cirugia Bucal
|April 9, 2017
Summary
Zygomatic implants in the jaw lead to increased muscle activity during chewing and jaw posture compared to natural teeth. This suggests a compensatory mechanism in patients with zygomatic implants.
Area of Science:
- Biomedical Engineering
- Dental Implantology
- Biomechanics
Background:
- Zygomatic implants offer a stable solution for atrophic maxilla rehabilitation.
- Electromyographic (EMG) activity of masticatory muscles is crucial for stomatognathic system function.
Purpose of the Study:
- To compare the EMG activity of masseter and temporalis muscles.
- To evaluate muscle function in individuals with zygomatic implants versus controls.
Main Methods:
- Fifty-four participants were divided into zygomatic implant (ZIG) and control (CG) groups.
- EMG activity was recorded during various mandibular movements and chewing tasks.
- Data was normalized and analyzed using statistical tests.
Main Results:
- Zygomatic implant users showed significantly higher EMG activity during posture and chewing.
- Increased muscle activity was observed for protrusion, clenching, laterality, and chewing.
- Higher mean EMG values were recorded in the ZIG group during masticatory performance.
Conclusions:
- Zygomatic implants stimulate heightened muscle fiber response (hyperactivity).
- This hyperactivity may result from the absence of periodontal receptors.
- The findings highlight altered muscle function and masticatory efficiency with zygomatic implants.