An Electromyography Study Comparing the Impact of Using RMEs on Muscle Activity Among Growing Orthodontic Patients

Study Overview
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Brief Summary
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Compare the impact of using rapid maxillary expanders on masticatory muscle activities (Masseter and Anterior Temporalis muscles) among different posterior cross-bite patient (unilateral, bilateral) as well as compare the cross-bite side and non-cross-bite sides of the same preadolescent unilateral crossbite patient before the expansion and after one month of the completion treatment period using surface electromyography device.

Detailed Description
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Compare the impact of using rapid maxillary expanders on masticatory muscle activities (Masseter and Anterior Temporalis muscles) between the cross-bite side and non-cross-bite sides of the same preadolescent orthodontic patient before the expansion and after one month of the completion treatment period. Two channels surface Electromyography sEMG (BioRadio), will be position to record the activity of anterior temporal (AT) and masseter (MM) muscles in three different statuses: Rest → patients will instruct to not bite on his/her teeth. Clench → patients will instruct to made a maximum voluntary clench on cotton rolls positioned around the first molar, for 5 sec the cotton clench, and a maximum voluntary clench without the interposed rolls for 5 sec the clench. * This procedure followed the Sforza et al. protocol. During function mastication → The patients will instruct to chew on a chewing gum for 20 sec (20 continuous masticatory cycles). Examination frequency: The patients will be examined two times as follow: Test 1: Immediately before rapid maxillary expanders cementation, Test 2: 5 months later (1 month after the retention phase). the same procedure will be done on 35 patients (control group)

Official Title
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An Electromyography Study Comparing the Impact of Using RMEs on Muscle Activity Among Growing Orthodontic Patients (A Prospective Clinical Study)

Conditions
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Malocclusion

Intervention / Treatment
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* Device: Surface EMG device


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Uni-lateral/ or bilateral posterior cross-bite. Patients with erupted permanent maxillary and mandibular first molars. Will be treated by rapid maxillary expanders, (the appliance planning to be worn for approximately 5 months). Age ranged from 9 to 12. Males and females. Not under any medications. Skeletal Class I or Class II (based on ANB angle, convexity, and Wits appraisal). No active caries. Healthy periodontal tissues. Subjects with no signs of TMD or condylar problems. Exclusion Criteria: History of any functional appliance treatment. Oral, systemic disease or any syndromes. Patients under any medications. 6. Patients with symptoms of Temporomandibular disorders. 4. Neuropathic conditions. 5. Open and deep-bite.

Ages Eligible for Study
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Minimum Age: 9 Years
Maximum Age: 15 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: unilateral crossbite<br>unilateral crossbite patients with constricted maxilla, going to be treated by rapid maxillary expanders the surface Electromyography (surface EMG device) device will be used to examine the muscle activities before and after expansion | Device: Surface EMG device<br>* measuring the muscles activity using surface EMG device<br>* Other names: BioRadio EMG Device;|
| No Intervention: control<br>the surface Electromyography (surface EMG device) device will be used to examine the muscle activities on normal patients | |
| Experimental: Bilateral crossbite<br>Bilateral crossbite patients with constricted maxilla, going to be treated by rapid maxillary expanders the surface Electromyography (surface EMG device) device will be used to examine the muscle activities before and after expansion | Device: Surface EMG device<br>* measuring the muscles activity using surface EMG device<br>* Other names: BioRadio EMG Device;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| measuring the masticatory muscles activity using electromyography device | the muscle activities of masticatory muscles using surface Electromyography device before and compare it after the maxillary expansion using Rapid Maxillary Expanders (to study the impact of the expanders on the muscles), the muscle activity will be in form of micro volt/second (mV/sec), the data will aggregated then exported on excel sheet in a form of numbers for statistical analysis | Test 1: before cementation of rapid maxillary expander, Test 2: after removal of rapid maxillary expander by 1 month |