Abstract
Objective: To measure the intensity of muscle strength and electrical activity of masseter and anterior temporal muscles based on BTX-A therapy in patients rehabilitated with total prostheses on zygomatic implants. Material and Methods: The object of the study was a sample of 20 individuals subjected to zygomatic implant surgery and rehabilitated with implant-supported prostheses, in order to obtain electromyographic data using an eight-channel module (EMG System do Brasil). The data were collected for three consecutive months: prior to the application (single dose) of BTX-A (30 U/ masseter muscle; 10 U/temporal muscle) and after 30 and 90 days of therapeutic treatment. Result: All muscle groups studied showed reduction of muscle electrical activity during voluntary contraction after 30 days of treatment (around 47%) (p < 0.001), which progressively reverted after 90 days of treatment. The anterior temporal muscles presented similar motor behavior, with activity reduction of 39% (p < 0.05). There was a reduction of 17.68% (p < 0.05) in mandibular force and an increase of 14.22% (p < 0.05) in mouth opening after 30 days of BTX-A administration. Conclusions: The results suggest that BTX-A significantly reduces muscle activity, in either the recruitment of motor units or muscle tone, in the first three months of therapeutic treatment. This therapy may also be useful as a preventive method for the failure of zygomatic implant-supported prostheses.KeywordsElectromyography; Dental implants; Prostheses on implants; Botulinum toxin.Keywords: Electromyogra phy; Dental implants; Prostheses on implants; Botulinum toxin.
Highlights
I mplantology has emerged as a solution for rehabilitating fully edentulous patients with osseointegrated implants, as a support for total prostheses [1]
Considering the need to protect the prosthesis on zygomatic implants against excessive muscle force, in addition to the occlusal adjustment in the maintenance of prosthesis on implants, the present study proposes to evaluate the modulation of muscle strength and activity of patients rehabilitated with prostheses on zygomatic implants by means of the therapeutic use of botulinum toxin
This study was performed after the approval by the local ethics committee (84013618.9.0000.0077) with a sample of 20 individuals who underwent zygomatic implant placement surgeries and rehabilitation with total implant-supported prostheses
Summary
I mplantology has emerged as a solution for rehabilitating fully edentulous patients with osseointegrated implants, as a support for total prostheses [1]. This specialty was developed to restore the aesthetics of single elements, complete rehabilitation is still a challenge when the patient does not present optimal bone availability for a prosthetic treatment on implants. For the treatment of patients affected by severe pathological or physiological bone resorptions, implants were developed with anchorage made outside the alveolar bone. Such implants seek support on the zygomatic bone, so they receive the same name. Zygomatic implants have length characteristics ranging from 30 to 55 mm and indication for patients without bone support to receive conventional implants [3]
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