Abstract
Aims:
To examine the effect of manual therapy applied to the cervical joint for reducing pain and improving mouth opening and jaw function in people with TMDs.
Methods:
A systematic review of randomized controlled trials was performed. Participants were adults diagnosed with TMDs. The experimental intervention was manual therapy applied to the cervical joint compared to no intervention/placebo. Outcome data relating to orofacial pain intensity, pressure pain threshold (PPT), maximum mouth opening, and jaw function were extracted and combined in meta-analyses.
Results:
The review included five trials involving 213 participants, of which 90% were women. Manual therapy applied to the cervical joint decreased orofacial pain (mean difference: –1.8 cm; 95% CI: –2.8 to –0.9) and improved PPT (mean difference: 0.64 kg/cm2; 95% CI: 0.02 to 1.26) and jaw function (standardized mean difference: 0.65; 95% CI: 0.3 to 1.0).
Conclusion:
Manual therapy applied to the cervical joint had short-term benefits for reducing pain intensity and improving jaw function in women with TMDs. Further studies are needed to improve the quality of the evidence and to investigate the maintenance of benefits beyond the intervention period. J Oral Facial Pain Headache 2023;37:101–111. doi: 10.11607/ofph.3093
Keywords: manipulation, mobilization, massage, pain, rehabilitation, temporomandibular joint
Temporomandibular disorders (TMDs) are defined as a group of conditions that affect the masticatory muscles, the temporomandibular joint (TMJ), and/or associated structures.1 About 10% of the adult population suffers from TMDs, which are the main cause of nonodontogenic orofacial pain in women 20 to 40 years of age.2–4 The prognosis of TMDs is controversial, and acute episodes may progress to recurrent or chronic orofacial pain.5 Orofacial pain typically limits mouth opening and the performance of everyday activities that require mandibular movements, such as biting, chewing, talking, and kissing.6,7 This may ultimately reduce an individual’s quality of life and community participation.8,9
Over 50% of patients with TMDs also present with complaints of neck pain.10 A relationship between orofacial and neck pain has been described in patients with TMDs attributed to neuronal and biomechanical associations with the cervical spine.1,11–13 Nociceptive afferents from the trigeminal nerve and the cervical spine both synapse in the subnucleus caudalis; therefore, cervical nociceptive afferents can excite second-order neurons that also receive input from facial tissues. The convergence of nociceptive stimuli to the same brain region alters pain modulation, which may trigger referred pain and change the activity of the masticatory and cervical muscles.14,15 In addition, potential pain input from regions outside trigeminal receptive fields (eg, the dorsal horn of the spinal cord) may excite brain structures that communicate with the trigeminal nuclei and modulate their functions. Changes in the mobility of the cervical joint are also observed in people with TMDs, as well as less activation of the deep cervical flexor musculature.15–17 Although a causative relationship is not fully established, the literature suggests a comorbidity between these two conditions.10,17 Therefore, a broad cervical spine examination is recommended in patients with TMDs, and the addition of interventions focused on the cervical joint may help reduce the presence and intensity of the disorder.
Many interventions are recommended to treat neck pain, such as exercises, laser treatment, dry needling, and manual therapy.18 Manual therapy includes any manual technique such as manipulation (ie, localized force of high velocity and low amplitude directed at specific spinal segments) or mobilization (ie, low-velocity or small- or large-amplitude passive movement or neuromuscular techniques within the patient’s physiologic range of motion).19,20 The effectiveness of manual therapy applied to the cervical joint may be due to neuroanatomical interactions1 and/or to neurophysiologic effects that influence pain, motor control, and sympathetic nervous system activity.21 One systematic review,22 which included a meta-analysis based on three randomized trials, reported that manual therapy applied to the cervical joint may reduce orofacial pain (standardized mean difference [SMD]: –1.4; 95% CI: –2.4 to –0.5, I2 = 81%) and improve the pressure pain threshold (PPT) of the masticatory muscles (SMD: 1.2; 95% CI: 0.06 to 2.4, I2 = 89%). However, the review did not examine the carryover of improved pain to activities of daily living.
Therefore, the aim of the present systematic review was to update the evidence for manual therapy applied to the cervical joint for reducing orofacial pain and to examine effects on mouth opening and jaw function in people with TMDs. The specific research questions were as follows: (1) In people with TMDs, does manual therapy applied to the cervical joint reduce pain and increase mouth opening?; and (2) Are any benefits carried over to activity?
Materials and Methods
This review was prospectively registered at PROSPERO (CRD42020192734) and is reported according to the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) statement guidelines (www.prisma-statement.org).
Identification and Selection of Trials
Searches were conducted in the MEDLINE (1946 to March 2021), AMED (1986 to March 2021), Embase (1947 to March 2021), Cochrane (2005 to March 2021), Global Health (1910 to March 2021), and PEDro (to March 2021) databases for relevant studies without date or language restrictions. The search strategy was registered at PubMed/MEDLINE, so the authors received monthly notifications of potential papers related to this systematic review. Search terms included words related to TMDs, the cervical joint, and randomized clinical trials (Appendix Table 1). Titles and abstracts were displayed and screened to identify relevant studies. The full texts of the relevant peer-reviewed papers were retrieved, and their reference lists were screened to identify further relevant studies. The Methods sections of the retrieved papers were extracted and reviewed independently by two reviewers (C.H.S. and F.M.G.L.) using predetermined criteria (Table 1). Both reviewers were blinded to authors, titles, journals, and results. Disagreements or ambiguities were resolved by consensus after discussion with a third reviewer (T.V.S.).
Table 1.
Inclusion Criteria
| Design |
| Randomized controlled trials |
| Participants |
| Adults (> 18 y) |
| Diagnosis of TMDs |
| Intervention |
| Experimental intervention = manual therapy applied to the cervical joint |
| Outcome measures |
| Measures of pain, mouth opening, and/or mandibular activity |
Assessment of Characteristics of Trials
Methodologic quality
The methodologic quality of the included trials was assessed by extracting the PEDro scores from the Physiotherapy Evidence Database (www.pedro.org.au). The PEDro scale is an 11-item scale designed for rating the methodologic quality (internal validity and statistical information) of randomized trials. Each item, except for item 1, contributes 1 point to the total score (range: 0 to 10 points). When a trial was not included in the database, it was scored by a reviewer who had completed the PEDro scale training tutorial (F.M.G.L.).
Participants
Trials involving adults with diagnoses of TMDs were included. Number of participants, age, pain duration, and diagnostic criteria were recorded to assess the similarity of the studies.
Intervention
Trials were included if the experimental intervention was manual therapy applied to the cervical joint. Manual therapy was defined as the application of manual force to the cervical joint, muscles, or connective tissues using techniques such as massage therapy, joint mobilization, and/or manipulation.23 The control intervention could be no intervention or a placebo intervention. Session duration, session frequency, and program duration were recorded to assess the similarity of the studies.
Measures
Four outcomes were of interest: orofacial pain intensity, PPT, maximum mouth opening, and jaw function. The measurement of orofacial pain intensity had to be based on validated self-report methods (eg, visual analog scale [VAS] or numeric rating scale). When multiple measures of pain intensity were reported in one study (eg, pain at rest, worst pain, minimum pain), the results of the individual measurements were averaged.24 The measurement of PPT had to be a direct measure of the minimum amount of pressure needed to trigger a pain sensation (eg, using a pressure algometer).25,26 When multiple measures of PPT were reported in one study (eg, for the masseter and temporalis muscles), the results of the individual measurements were averaged.24 The measurement of maximum mouth opening had to be a direct measure of the distance between the incisal edges of the maxillary and the mandibular reference teeth, corrected for anterior overbite or open bite27,28 (eg, using a caliper or analog/digital rulers). The measurement of activity had to be representative of everyday jaw function, such as eating or laughing (eg, the Mandibular Function Impairment Questionnaire). When multiple questionnaires assessing jaw function were reported in one study, the questionnaire with more activities was used. The timing of the measurements and the procedure(s) used to measure the outcomes were recorded to assess the appropriateness of combining studies in a meta-analysis.
Data Analysis
Information about the methods (ie, design, participants, intervention, measures) and results (ie, number of participants and mean and SD values of the outcomes of interest) were extracted by two reviewers (F.M.G.L. and T.V.S.) and checked by a third reviewer (L.R.N.). If the information was not available in the published trials, details were requested from the corresponding author.
The postintervention scores were used to obtain the pooled estimate of the effect of intervention using a random-effects model. A visual inspection of the distribution of effect sizes in the forest plots was performed, and the I2 value was calculated to indicate the proportion of variance that was due to heterogeneity.29 I2 values > 50% are indicative of important heterogeneity.29,30 The analyses were performed using Review Manager version 5.4 (The Nordic Cochrane Centre). For all outcome measures, the critical value for rejecting the null hypothesis was set at a level of .05 (two-tailed). The pooled data for each outcome were reported as the weighted mean difference (MD) or as the SMD between groups with the corresponding 95% CI. When trial data could not be included in a pooled analysis, the between-group result was reported.
The GRADE (Grading of Recommendations Assessment, Development, and Evaluation) system was used to summarize the overall quality of evidence for each outcome, which could range from very low to high quality.32 High-quality evidence was downgraded by one rating level if one of the following prespecified criteria was present: low methodologic quality (most trials had PEDro score < 6); inconsistency of estimates among pooled studies (I2 > 50%) or assessment was not possible (no pooling); indirectness of participants (most trials did not report pain duration or the analyses mixed acute and chronic participants); and imprecision (pooling < 300 participants for each outcome).24,33 Two reviewers (F.M.G.L. and L.R.N.) assessed the quality of the evidence using the GRADE system, with potential disagreements resolved by consensus (T.V.S.).
RESULTS
Flow of Trials through the Review
The electronic search strategy identified 814 papers. After screening titles, abstracts, and reference lists, 18 potentially relevant full papers were retrieved, but 10 were duplicates. From the remaining 8 papers, 3 failed to meet the inclusion criteria (see Appendix Table 1), resulting in 5 papers included in the review (Fig 1). All information was extracted from the original publications, and no authors needed to be contacted for more detailed information.
Fig 1.
Flowchart of study inclusion. a Trials may have been excluded for failing to meet more than one inclusion criterion (see Appendix Table 2).
Characteristics of Included Trials
The 5 trials involved 213 participants (90% women) and investigated the effects of manual therapy applied to the cervical joint for improving orofacial pain intensity (n = 4), PPT (n = 3), maximum mouth opening (n = 3), and jaw function (n = 2; Table 2).
Table 2.
Characteristics of the Included Trials (n = 5)
| Study | Participants | Intervention | Outcome measures |
|---|---|---|---|
| Bortolazzo et al34 (2015) | n = 10 Mean (SD) age = 25 (7) y Female sex = 100% Pain duration = 1–5 y Type of TMD = myalgia | Experimental = cervical manipulation; 3–9 reps x 1/wk x 5 wk Control = sham cervical manipulation; 30 s x 1/wk x 5 wk | Mouth opening = caliper ruler (mm) Measurements = 0, 5 wk |
| Calixtre et al38 (2018) | n = 61 Mean (SD) age = 26 (5) y Female sex = 100% Pain duration = 5 (range 2–10) y Type of TMD = myalgia or mixed (myalgia + arthralgia or myalgia + disc displacement) | Experimental = cervical mobilization and cervical exercises; 15–20 min × 3/wk × 5 wk Control = no treatment | Orofacial pain intensity = VAS (0–10 cm; anchors were not reported) PPT = caliper (kg/cm2) Jaw function = MFIQ (0–52) Measurement = 0, 5 wk |
| Corum et al35 (2018) | n = 60 Mean (SD) age = 27 (7) y Female sex = 100% Pain duration = > 6 mo Type of TMD = myalgia or disc displacement or mixed (myalgia + disc displacement) | Experimental = cervical manipulation; 1/wk × 6 wk Control = sham cervical manipulation; 1/wk × 6 wk Both = education and cervical exercises | Orofacial pain intensity = VAS (0–10 cm; anchors: no pain to pain as bad as could be) PPT = caliper (kg/cm2) Mouth opening = 10-cm ruler (mm) Measurements = 0, 6 wk |
| La Touche et al37 (2013) | n = 32 Mean (SD) age = 34 (8) y Female sex = 66% Pain duration = 11 (6) mo Type of TMD = myalgia | Experimental = cervical mobilization; 7 min x 1–2/wk × 2 wk Control = sham cervical mobilization; 7 min x 1–2/wk × 2 wk | Orofacial pain intensity = VAS (0–100 mm; anchors: no pain to worst pain) PPT = caliper (kg/cm2) Measurements = 0, 2 wk |
| Reynolds et al36 (2020) | n = 50 Mean (SD) age = 35 (13) y Female sex = 86% Pain duration = 6 (7) y Type of TMD = myalgia or mixed (not specified) | Experimental = suboccipital release + cervical manipulation; 4–8 reps x 1/wk × 4 wk Control = suboccipital release + sham cervical manipulation; 4–8 reps × 1/wk × 4 wk Both = education and home-based exercises | Orofacial pain intensity = VAS (0–10; anchors not reported) Mouth opening = caliper ruler (mm) Jaw function = JFLS (0–200) Measurements = 0, 4 wk |
MFIQ = Mandibular Function Impairment Questionnaire ; JFLS = Jaw Function Limitation Scale.
Methodologic quality
The mean PEDro score of the trials was 7 (range: 5 to 8; Table 3). All trials randomly allocated their participants, had < 15% dropouts, and reported point estimate, variability, and between-group differences. Most trials had similar groups at baseline (80%), blinded assessors (80%), and concealed allocation (60%). On the other hand, most trials did not blind participants (80%) or therapists (100%), which is difficult or impossible during complex interventions, and did not report whether an intention-to-treat analysis had been undertaken (60%).
Table 3.
PEDro Criteria and Scores of the Included Trials (n = 5)
| Study | Random allocation | Concealed allocation | Groups similar at baseline | Participant blinding | Therapist blinding | Assessor blinding | < 15% dropouts | Intention-to-treat analysis | Between-group difference reported | Point estimate and variability reported | Total (0 to 10) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Bortolazzo et al34 (2015) | Y | N | N | N | N | Y | Y | N | Y | Y | 5 |
| Calixtre et al38 (2018) | Y | Y | Y | N | N | Y | Y | Y | Y | Y | 8 |
| Corum et al35 (2018) | Y | N | Y | N | N | N | Y | N | Y | Y | 5 |
| La Touche et al37 (2013) | Y | Y | Y | Y | N | Y | Y | N | Y | Y | 8 |
| Reynolds et al36 (2020) | Y | Y | Y | N | N | Y | Y | Y | Y | Y | 8 |
Y = yes; N = no.
Participants
Trials included participants with a mean age ranging from 25 to 35 years. Most participants were women (90%). The included participants were diagnosed with myalgia or mixed TMDs according to the Diagnostic Criteria for TMDs (DC/TMD) or Research Diagnostic Criteria for TMDs (RDC/TMD). On average, the participants had orofacial pain ranging from 6 months to 6 years across trials.
Intervention
In all trials, the experimental intervention was manual therapy delivered as manipulation,34–36 mobilization,37 or mobilization associated with exercises,38 carried out in rehabilitation centers. Participants received, on average, three to nine repetitions (or 7 to 20 minutes) of manual therapy, one to three times per week, over 4 weeks (SD: 1.5). The control group received no intervention38 or a placebo intervention.34–37 Two trials35,36 delivered additional interventions (eg, cervical exercises, education, or home-based exercises) to both groups.
Outcome measures
Four trials35–38 measured orofacial pain intensity using a 0 to 10 VAS. Three trials35,37,38 measured PPT using an algometer (kg/cm2). Three trials34–36 measured unassisted maximum mouth opening without pain using either an analog or a digital ruler (millimeters). Two trials36,38 measured jaw function using self-report questionnaires.
Effect of Manual Therapy Applied to the Cervical Joint
Orofacial pain intensity
The effect of manual therapy applied to the cervical joint on orofacial pain intensity was examined by pooling postintervention data from four trials.35–38 Overall, low-quality evidence indicated that manual therapy applied to the cervical joint reduced orofacial pain intensity by –1.8 cm (95% CI: –2.8 to –0.9, I2 = 74%, P < .01, Appendix Fig 1). When the trials were grouped according to the duration of pain, pain intensity was reduced in individuals with < 12 months of pain duration (MD: –2.7 cm; 95% CI: –3.3 to –2.1, I2 = 0%, P < .01) and with a duration > 12 months (MD: –1.1 cm; 95%: CI: –1.8 to –0.4, I2 = 0%, P < .01).
Pressure pain threshold
The effect of manual therapy applied to the cervical joint on PPT was examined by pooling postintervention data from three trials.35,37,38 Overall, low-quality evidence indicated that manual therapy applied to the cervical joint improved PPT by 0.64 kg/cm2 (95% CI: 0.02 to 1.26, I2 = 92%, P < .01, Appendix Fig 2). When trials were grouped according to the duration of pain, the PPT improved in individuals with less than 12 months of pain duration (MD: 0.92 kg/cm2; 95% CI: 0.51 to 1.34, I2 = 65%, P < .01). Only one trial suggested a small positive effect on PPT in individuals with pain duration > 12 months (MD: 0.10 kg/cm2), but this estimate was very imprecise (95% CI: –0.15 to 0.35, P = .43).
Maximum mouth opening
The effect of manual therapy applied to the cervical joint on maximum mouth opening was examined by pooling postintervention data from three trials.34–36 Overall, low-quality evidence indicated that manual therapy applied to the cervical joint may have had a small beneficial effect on maximum mouth opening (MD 1.5 mm), but this estimate was very imprecise (95% CI: –1.8 to 4.9, I2 = 0%, P = .37, Appendix Fig 3).
Jaw function
The effect of manual therapy applied to the cervical joint on jaw function was examined by pooling postintervention data from two trials.36,37 Overall, moderate-quality evidence indicated that manual therapy applied to the cervical joint improved jaw function by an SMD of 0.65 (95% CI 0.3 to 1.0, I2 = 0%, P < .01, Appendix Fig 4) in individuals with pain duration > 12 months. No trials examined jaw function in individuals with pain duration < 12 months.
DISCUSSION
This systematic review provided low-quality evidence that manual therapy applied to the cervical joint reduces pain in people diagnosed with TMDs. Moreover, moderate-quality evidence indicated that benefits were carried over to improving jaw function.
Orofacial pain intensity was measured using a validated self-report scale, which provides patient-centered data that are unique in capturing patients’ own opinions regarding the effect of the intervention.39,40 Although this review was not designed to determine the mechanisms that lead to orofacial pain improvements, which could be neurologic, biomechanical, or improvements in the general mood and well-being of patients, the results provided support for using manual therapy applied to the cervical joint because the magnitude of the effect was not only statistically significant but also clinically relevant. Previous trials have indicated that reductions > 1.7 are associated with significant clinical improvements in individuals with chronic pain, and therefore the mean reduction of 1.8 (out of 10) found in the present review could be considered clinically relevant.41,42 Moreover, as the mean baseline pain intensity across trials was 4.8 (SD: 1.5), a reduction of 1.8 represents nearly a 40% reduction, which is beyond the cutoff scores for changes in pain scales.43 There was some statistical heterogeneity in meta-analyses that disappeared when trials were grouped according to the duration of pain symptoms. Preliminary analysis of the 95% CI suggests that manual therapy is effective in people reporting pain duration of < 12 months. Manual therapy also showed beneficial effects in people reporting pain duration for > 12 months, but the estimate was imprecise. Due to the small number of available trials, subgroup analyses could not be performed.44 On the other hand, improvements in self-reported pain intensity were supported by validated and reliable measurements of PPT.45 Larger trials are recommended to strengthen the quality of evidence regarding pain intensity.
Moreover, moderate-quality evidence indicated that the benefits regarding pain were carried over to improving jaw function, as also measured using self-report questionnaires. Neurophysiologic mechanisms such as innervation14 and the biomechanical interaction between the cervical joint and the TMJ46 may explain improvements in jaw function that require submaximal mouth opening. The magnitude of the effect was positive and moderate, but imprecision in the CIs suggests that further trials should include measures of jaw function as outcomes instead of maximum mouth opening. Since publication of the International Classification of Functioning, Disability, and Health, patient-reported outcome measures have been recommended to guide routine patient care because they are unique in capturing the patients’ own opinions about the impact of their health condition and the treatment on their lives that the outcomes reflect.47,48 Although maximum mouth opening is a quite common outcome in trials related to the cervical joint, most jaw function in everyday activities does not require extreme ranges of motion. Previous trials suggest that interventions focused on the TMJ appear to be more effective for improving maximum mouth opening.18,49
A limitation of the trials included in this review was the fact that, despite achieving good methodologic quality, the quality of the evidence varied from low to moderate due to small samples and indirectness of the participants caused by a varied range of pain duration. Furthermore, the included clinical trials did not provide clear evaluations of the cervical joint and might have included individuals with no cervical impairments, which gives little room for improvements. On the other hand, studies were clinically homogenous regarding the characteristics of the intervention, which indicate that three to nine repetitions (or 7 to 20 minutes) of manual therapy applied to the cervical joint, one to three times per week, over 4 weeks (SD: 1.5) reduces pain and improves jaw function in women with TMDs. In addition, it is important to highlight that participants in the included trials were predominantly women, as TMDs are more prevalent in women. Therefore, caution should be taken when extending these results to men. Larger trials are warranted to reduce the indirectness of participants by establishing proper inclusion criteria regarding pain intensity and cervical impairments, which may reduce the imprecision related to the CI of the estimates of effect.
Conclusions
This systematic review provides low- to moderate-quality evidence that manual therapy applied to the cervical joint had short-term benefits for reducing pain and improving jaw function in women with TMDs. Therefore, manual therapy emerges as an adjoint treatment to be recommended after full biopsychosocial and interdisciplinary evaluation of each patient. There is still work to be done in this area; in particular, larger high-quality trials to strengthen the quality of the evidence and to include examination of long-term benefits are warranted.
HIGHLIGHTS
Manual therapy applied to the cervical joint reduces pain in individuals with TMDs.
Benefits are carried over to improving jaw function.
ACKNOWLEDGMENTS
The authors report no conflicts of interest. Author contributions: F.M.G.L.: research design and supervision, selection of trials, data extraction, statistical analysis (execution), writing of the first draft, manuscript review; T.V.S, C.H.S., and N.F.F.O.: selection of trials, data extraction, statistical analysis (design and execution), writing of the first draft, manuscript review; L.R.N.: research design and supervision, selection of trials, data extraction, statistical analysis (design and execution), writing of the first draft, English editing, and manuscript review.
Appendix Fig 1 Mean difference (SD) of the effect of manual therapy applied to the cervical joint on orofacial pain intensity (0–10 points).
Appendix Fig 2 Mean difference (SD) of the effect of manual therapy applied to the cervical joint on PPT (kg/cm2).
Appendix Fig 3 Mean difference (SD) of the effect of manual therapy applied to the cervical joint on maximum mouth opening (mm).
Appendix Fig 4 Standardized mean difference (SD) of the effect of manual therapy applied to the cervical joint on jaw function.
Appendix Table 1 Search Strategy
| MEDLINE, AMED, Embase, Cochrane, Global Health |
| 1. exp Craniomandibular Disorders/ or exp Myofascial Pain Syndromes/ (40235) |
| 2. ((masticat$ or myofasc$ or orofacial$) and (pain$ or dysfunction$ or syndrom$)).mp. (34750) |
| 3. (temporomandibular$ or temporo-mandibular$ or craniomandibular$ or craniomandibular$).mp. (62254) |
| 4. (facial pain adj3 (psychogenic$ or atypical or chronic)).mp. (1573) |
| 5. (tmj$ or cmd$ or tmd$ or ’facial arthromyalgia$’).mp. (43979) |
| 6 (mpds not (myeloprolif$ or myelo-prolif$)).mp. (612) |
| 7. 1 or 2 or 3 or 4 or 6 (88031) |
| 8. neck/ or neck muscles/ or exp cervical plexus/ or exp cervical vertebrae/ or Atlanto-Axial Joint/ or atlanto-occipital joint/ or axis/ or atlas/ or spinal nerve roots/ or exp brachial plexus/ (250811) |
| 9. (odontoid or cervical or occip$ or atlant$).tw. (801559) |
| 10. 8 or 9 (981281) |
| 11. double-blind method/ or single blind method/ or placebos/ (623785) |
| 12. exp clinical trial/ (2418772) |
| 13. clinical trial.pt. (523179) |
| 14. random$.ti,ab,sh. (3345483) |
| 15. 11 or 12 or 13 or 14 (4625415) |
| 16. 7 and 10 and 15 (748) |
| 17. limit 16 to human [Limit not valid in AMED,CDSR,Global Health; records were retained] (692) |
| PEDro> |
| Abstract and Title: |
| Search 1: Temporomandibular and neck |
| Search 2: Temporomandibular joint disorders and neck |
| When Searching: Match all search terms (AND) |
Appendix Table 2 Excluded Papers (n = 12)
| Studies | Reasons for exclusion | ||||
|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | |
| Calixtre et al (2016) | ✓ | ||||
| Cuccia et al (2009) | ✓ | ||||
| Ferragud and Gandia (2008) | ✓ | ||||
| Garrigós-Pedrón et al (2018) | ✓ | ||||
| Gesslbauer et al (2018) | ✓ | ||||
| La Touche et al (2009) | ✓ | ||||
| Oliveira et al (2015) | ✓ | ||||
| Oliveira-Campelo et al (2010) | ✓ | ||||
| Serna et al (2020) | ✓ | ||||
| Tuncer et al (2013) | ✓ | ||||
| Von Piekartz and Ludtke (2011) | ✓ | ||||
| Von Piekartz and Hall (2013) | ✓ | ||||
1 = Research design not RCT.
2 = Experimental intervention not manual therapy applied to the cervical joint.
3 = Both groups received manual therapy applied to the cervical joint.
4 = Participants did not have TMDs.
5 = Single session of treatment.
References of Excluded Papers
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Contributor Information
Fernanda M.G. Liberato, Center of Health Sciences; Universidade Federal do Espírito Santo; Vitória, Brazil.
Thiago V. da Silva, Center of Health Sciences; Universidade Federal do Espírito Santo; Vitória, Brazil.
Cintia H. Santuzzi, Center of Health Sciences; Universidade Federal do Espírito Santo; Vitória, Brazil.
Néville Ferreira Fachini de Oliveira, Center of Health Sciences; Universidade Federal do Espírito Santo; Vitória, Brazil.
Lucas R. Nascimento, Center of Health Sciences; Universidade Federal do Espírito Santo; Vitória, Brazil.
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