Non-Cochrane · intervention · PM41816273
Rapid maxillary expansion effects on masticatory muscle activity: A systematic review and meta-analysis.
Pedroso Gabriela Leite, Bernal Nicole Ranzani, Luiz Kelly Galisteu, et al. · Journal of orthodontic science · 2026 · PubMed · doi:10.4103/jos.jos_5_25
Findings
Population Children with unilateral posterior crossbite (mixed dentition)
6 findings
| Rapid maxillary expansion (Hyrax expander), EMG after treatment | Pre-treatment baseline EMG (before-after comparison) | Anterior temporalis muscle activity during maximum voluntary clenching on teeth After RME versus before RME | SMD -0.752 [-1.25, -0.25] Very low 2 studies |
| Rapid maxillary expansion (Hyrax expander), EMG after treatment | Pre-treatment baseline EMG (before-after comparison) | Masseter muscle activity during maximum voluntary clenching on cotton rolls After RME versus before RME | SMD 0.017 [-0.33, 0.36] Low 2 studies |
| Rapid maxillary expansion (Hyrax expander), EMG after treatment | Pre-treatment baseline EMG (before-after comparison) | Masseter muscle activity at rest After RME versus before RME | SMD 0.605 [0.07, 1.14] Very low 2 studies |
| Rapid maxillary expansion (Hyrax expander), EMG after treatment | Pre-treatment baseline EMG (before-after comparison) | Masseter muscle activity during maximum voluntary clenching on teeth After RME versus before RME | SMD -0.227 [-0.92, 0.46] Low 2 studies |
| Rapid maxillary expansion (Hyrax expander), EMG after treatment | Pre-treatment baseline EMG (before-after comparison) | Anterior temporalis muscle activity at rest After RME versus before RME | SMD 0.363 [-0.39, 1.11] Low 2 studies |
| Rapid maxillary expansion (Hyrax expander), EMG after treatment | Pre-treatment baseline EMG (before-after comparison) | Anterior temporalis muscle activity during maximum voluntary clenching on cotton rolls After RME versus before RME | SMD -0.02 [-0.19, 0.15] Moderate 2 studies |
Included primary studies 13
Open in Studies| Study | Year | Also included by | Outcomes it informs here | Trial data |
|---|---|---|---|---|
| Arat 2008 Muscular and condylar response to rapid maxillary expansion. Part 1: Electromyographic study of anterior temporal and superficial masseter… DOI:10.1016/j.ajodo.2006.07.028 | 2008 | this review only | not stated | not extracted yet |
| Arat 2008 Muscular and condylar response to rapid maxillary expansion. Part 1: electromyographic study of anterior temporal and superficial masseter… PMID:18538244 | 2008 | this review only | not stated | not extracted yet |
| De Rossi 2009 Electromyographic evaluation in children having rapid maxillary expansion DOI:10.1016/j.ajodo.2007.08.027 | 2009 | this review only | not stated | not extracted yet |
| De Rossi 2009 Electromyographic evaluation in children having rapid maxillary expansion. PMID:19732669 | 2009 | this review only | not stated | not extracted yet |
| Di Palma 2017 Longitudinal effects of rapid maxillary expansion on masticatory muscles activity. PMID:28512539 | 2017 | this review only | not stated | not extracted yet |
| Galbiati 2016 matched by author and year (probable) | NR | this review only | not stated | not extracted yet |
| Maffei 2014 Orthodontic intervention combined with myofunctional therapy increases electromyographic activity of masticatory muscles in patients with… DOI:10.3109/00016357.2013.824606 | 2013 | this review only | not stated | not extracted yet |
| Maffei 2014 Orthodontic intervention combined with myofunctional therapy increases electromyographic activity of masticatory muscles in patients with… PMID:24255961 | 2014 | this review only | not stated | not extracted yet |
| Maspero 2015 Neuromuscular evaluation in young patients with unilateral posterior crossbite before and after rapid maxillary expansion. PMID:26879400 | 2015 | this review only | not stated | not extracted yet |
| Michelotti 2019 Evaluation of masticatory muscle activity in patients with unilateral posterior crossbite before and after rapid maxillary expansion DOI:10.1093/ejo/cjy019 | 2018 | this review only | not stated | not extracted yet |
| Michelotti 2019 Evaluation of masticatory muscle activity in patients with unilateral posterior crossbite before and after rapid maxillary expansion. PMID:29688483 | 2019 | this review only | not stated | not extracted yet |
| Pimentel 2019 matched by author and year (probable) | NR | this review only | not stated | not extracted yet |
| Spolaor 2020 Effects of Rapid Palatal Expansion on Chewing Biomechanics in Children with Malocclusion: A Surface Electromyography Study. PMID:32272810 | 2020 | this review only | not stated | not extracted yet |
Review question
| Element | Planned (methods) | Found (results) |
|---|---|---|
| Population | Patients with posterior crossbite | Children aged 6 to 14 years with unilateral or bilateral posterior crossbite (n=9 studies) |
| Intervention | Rapid maxillary expansion with electromyographic evaluation | RME with Haas, modified Haas, Hyrax, acrylic splint or two-band expanders |
| Comparison | Electromyographic evaluation before versus after RME | Pre-RME EMG recordings |
| Outcomes | Electromyographic activity of masticatory muscles | Masseter and anterior temporalis EMG activity at rest, clenching on teeth and clenching on cotton rolls |
| Study designs | Randomized and nonrandomized interventional studies | Nonrandomized studies (n=9) |
| Timing | Not specified | Immediately after RME; follow-up 1.5 to 6 months in some studies |
AMSTAR 2 items
Two independent extractors rated each item. Their ratings are shown side by side because they have not been reconciled yet. The overall rating follows Shea et al. 2017: one critical flaw gives Low, more than one gives Critically Low.
| Item | Extractor A | Extractor B | Agree |
|---|---|---|---|
| 1Research question includes PICO components | Yes | Yes | yes |
| 2Protocol established before the reviewcritical | Partial Yes | Partial Yes | yes |
| 3Choice of study designs explained | No | No | yes |
| 4Comprehensive literature searchcritical | No | No | yes |
| 5Study selection in duplicate | Yes | Yes | yes |
| 6Data extraction in duplicate | Yes | Yes | yes |
| 7List of excluded studies with reasonscritical | No | No | yes |
| 8Included studies described in detail | Partial Yes | Partial Yes | yes |
| 9Risk of bias assessed satisfactorilycritical | RCT: N/A · NRSI: Yes | RCT: N/A · NRSI: Yes | yes |
| 10Funding of included studies reported | No | No | yes |
| 11Appropriate meta-analysis methodscritical | RCT: N/A · NRSI: No | RCT: N/A · NRSI: No | yes |
| 12Impact of risk of bias on the pooled results | No | No | yes |
| 13Risk of bias accounted for in interpretationcritical | Yes | Yes | yes |
| 14Heterogeneity explained | Yes | Yes | yes |
| 15Publication bias investigatedcritical | Yes | No | no |
| 16Conflicts of interest reported | Yes | Yes | yes |
| Overall | Critically Low | Critically Low | yes |