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Functional State of Mastication Muscles in Patients During Treatment of Lower Jaw Defects with Implants
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| Author:
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MANSUR SH. MIRZOYEV, KHURSHEJAN ?. GAPHAROV, DODARJON I. KHUSHVAKHTOV, MUKHAMEJAN N. SHAKIROV, ROZIYA N. JONIBEKOVA, RUSTAM I. YULCHIEV
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| Abstract:
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Objective. Assessment of the function of the mastication muscle groups in patients implant treatment of mandibular defects.
Materials and methods. This paper provides a general review of the results of research of mastication muscles’ function in 18 subjects, who were undergoing treatment at the Department of Maxillofacial Surgery of the Tajikistan Republic Medical Center from 2014 through 2017, aged 17 to 60. In 14 subjects of the study group, defects had been caused by tumors; in four subjects – by trauma factors. Research consisted in analysis of electric activity observed in mastication muscle groups with the use of a two-channel CADWELL Sierra II electromyograph (made in the USA), as well as through multispiral soft-tissue computed tomography with the help of a NEUSOFT Neu Viz 64 In tomograph; the results were expressed in Hounsfield Units (HU). This involved needle, stimulating and surface electromyography of mastication muscle groups in the affected area at rest and during masticatory stress. The assessment of the muscles’ function was carried out along with analysis of the amplitude of mandibular movements, also relying on clinical temporo-mandibular joint status parameters. To treat mandibular defects, custom-made STL-modeled nickel-titanium (NiTi) endoprostheses were used.
Results. Dynamic studies of electromyography data revealed a significant decrease in mastication muscles’ (mastication, medial pterygoid, digastric and mylohyoid) bioelectric activity throughout the immediate postsurgical period. After 20 to 30 days from surgery, the subjects showed a tendency toward improvement of muscular work both at rest and during mastication activity. A complete recovery of the mastication muscles’ electric activity in subjects would be observed 3 to 6 months afterg the surgery. A direct correlation between the dynamics of recovery of electromyography parameters, the extent of operation and the type of implant, has been discovered. Clinical studies involving the operated-on subjects have shown optimal post-surgery period length and healing dynamics. There have been no cases of festering or rejection.
Conclusion. The results of research of the function of mastication muscle groups in patients during implant treatment of mandibular defects, electromyography and multi-spiral computed tomography have shown a pronounced decrease in their electric activity both at rest and during masticatory stress during the immediate postsurgical period. Dynamic monitoring of these parameters and other clinical data indicated a tendency toward their recovery 3 months after surgery. Also, a significant shortening of the period of the recovery of mastication muscles’ electric activity was observed in cases whereby an implant had been custom-made to form retention points in order to fix muscles detached during the surgery, as well as to wrap it in a thin-profile NiTi mesh.
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| Keyword:
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electromyography, endoprostheses, nickel-titanium, thin-profile nickel-titanium mesh
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| EOI:
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| DOI:
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https://doi.org/10.31838/ijpr/2020.12.01.402
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| Download:
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