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| Author/year | Design | Sample details | Sample age (sd) | Control group | Control age (sd) | Evaluated muscles | Applied tests | Electromyographer | Electromyographic parameters | Conclusion |
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| Dong et al. [15], 2008 | Cross-sectional study with control group | N = 15 (8F and 7M) UPXB = 9; PXB = 6 | 23.0 (4.78) | N = 21 (10F and 11M) | 22.0 (0.92) | SM, SC, SH, ST | Maximum jaw opening and closing, head and neck flexion-extension, shoulder lifting and lowering | K7 Evaluation System: 8 channels | RMS, MPF | Individuals with mandibular asymmetry and PXB are associated with more asymmetric electromyographic patterns |
| Moreno et al. [18], 2008 | Observational study | N = 3 UPXB | 24 | Absent | Absent | SM, AT, PT, DG | Swallowing record (water), chewing record for 15 sec (3 chips), MVC for 3 sec | Myotronics ® K6-i: 8 channels | Signal amplitude (µV) | Individuals with UPXB presented increased electromyographic activity of the AT on the cross-side during MVC |
| Saifuddin et al. [16], 2003 | Cross-sectional study with control group | N = 15 (5F and 10M) PXB | 19.9 (5.3) | N = 15 (2F and 13M) | 28.6 (1.9) | SM and AT | Diurnal recording (2 periods: meals + regular activities) and night recording (sleep) | Muscle Tester ME3000P (Mega Electronics Ltd, Kuopio, Finland) | Signal amplitude (µV), asymmetry index | Individuals with mandibular deviation associated to PXB presented lower electromyographic activity in SM and AT muscles during diurnal recordings |
| Sverzut et al. [40], 2011 | Quasiexperimental clinical trial | N = 19 (13F and 6M) PXB | 25.4 | N = 19 (13F and 6M) | 25.4 | SM and AT | Usual chewing (gum), dental tightening, mouth opening and closing, rest, protrusion, and laterality (D and E) | MyoSystem-Br1 (São Paulo, Brazil) | RMS | Electromyographic activity decreases in SM and AT muscles after SARME during chewing and dental tightening |
| Takeshita et al. [41], 2013 | Case report | N = 1 (1F); skeletal class III with mandibular asymmetry, UPXB and AXB | 18.8 | Absent | Absent | SM, AT, and PT | Left and right unilateral chewing and dental tightening | No information | Electromyographic activity µV/s | Orthosurgical treatment determined a balanced and symmetrical chewing muscle activity |
| Tecco et al. [7], 2010 | Cross-sectional study with control group | N = 75 (30F and 45M) UPXB: 50; bilateral PXB:25 | M: 19.5 (5.6); F: 20.4 (3.2) | N = 25 (6F and 19M) | 22.5 (5.8) | SM, AT, PT, SC, PC, ST, and LT | Rest and MVC | Key-Win 2.0 (Biotronic s.r.l., San Benedetto Del Tronto, Ascoli Piceno, Italy): 60 channels | Electromyographic activity µV/s | Patients with PXB present electromyographic changes in the chewing muscles, neck, and upper trunk |
| Woźniak [17], 2015 | Cross-sectional study with control group | N = 50 (22F and 28M) UPXB and TMD | 20.84 (1.14) | N = 100 (54F and 46M) | 21.42 (1.06) | SM and AT | Rest and MVC | DAB-Bluetooth Instrument (Zebris Medical GmbH, Germany | Asymmetry index (AI) and torque coefficient (TC) | UPXB was associated with changes in SM and AT muscle activity |
| Yamasaki, et al. [42], 2015 | Observational study | N = 2 PXB | 31.3 | Absent | Absent | SM | Left and right unilateral chewing of different types of food (peanut, beef jerk, and chewing gum), and MVC | ProComp INFINITI; Thought Technology, (Montreal, Canada) | RMS | Individuals with PXB present an altered level of agreement regarding the parameters of identification of the preferred side of the bite |
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