Ultrasonographic Findings of Masseter Muscle in Females With Temporomandibular Disorders

Imanimoghaddam, Mahrokh; Davachi, Behrouz; Madani, Azam Sadat; Nemati, Somayyeh

doi:10.1097/scs.0b013e3182646af0

Cited by 10 publications

(5 citation statements)

References 11 publications

(20 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a result, the thickness of the masseter muscle of the TMD was 18.8% lower in the relaxed state and 15.9% lower in the clenched state. Imanimoghaddam et al [ 42 ] found that the masseter thickness of the TMD group was 10.8% lower than that of a non-TMD. Pereira et al [ 15 ] reported that the masseter muscle thickness of the group with TMD was 3.8% lower in the right contracted state and 2.3% lower in the left contracted state than in the non-TMD group.…”

Section: Discussionmentioning

confidence: 99%

Assessments of Muscle Thickness and Tonicity of the Masseter and Sternocleidomastoid Muscles and Maximum Mouth Opening in Patients with Temporomandibular Disorder

Lee¹

2021

Healthcare

View full text Add to dashboard Cite

The purpose of this study was to compare the muscle thickness and tone of the masseter and sternocleidomastoid (SCM) muscles and maximum mouth opening (MMO) in subjects with and without temporomandibular disorders (TMD), and perform a correlation comparison on the results of the TMD group. Sixty patients were allocated to the TMD group (n = 30) or the non-TMD group (n = 30). Ultrasound imaging, myotonometer, and vernier calipers were used to determine the related changes in muscle thickness and muscle tone in masseter and SCM, and MMO, respectively. The TMD group revealed a significant decrease than the non-TMD group in the muscle thickness of masseter and SCM, respectively (p < 0.001), with a significant increase in frequency (p < 0.001) and stiffness (p < 0.001) in the masseter muscle tone, with a significant increase in frequency (p < 0.001) and stiffness (p = 0.005) in the SCM muscle tone, a significant decrease in the MMO (p < 0.001). There was a moderate negative correlation between the relaxed state of masseter muscle thickness and stiffness of SCM muscle tone (r = −0.40, p = 0.002), and a moderate negative correlation between the relaxed state of SCM muscle thickness and frequency of SCM muscle tone (r = −0.42, p = 0.001). There was a moderate negative correlation between the clenching state of SCM muscle thickness and the frequency of SCM muscle tone (r = −0.47, p < 0.001). In addition, a moderate negative correlation between MMO and frequency of SCM muscle tone (r = −0.44, p < 0.001). The muscle thickness was decreased, and the muscle tone was increased in the masseter and SCM muscle, respectively. Additionally, MMO was decreased in patients with TMD compared with non-TMD.

show abstract

Section: Discussionmentioning

confidence: 99%

Assessments of Muscle Thickness and Tonicity of the Masseter and Sternocleidomastoid Muscles and Maximum Mouth Opening in Patients with Temporomandibular Disorder

Lee¹

2021

Healthcare

View full text Add to dashboard Cite

show abstract

“…In recent years, studies using MRI and US in patients with masticatory muscle myalgia have frequently been reported ( 111 ). Few studies showed no statistically significant differences in the masseter muscle width between myofascial patients and control subjects ( 61 ), while others showed obvious US changes in the masseter muscle, especially in female myofascial syndrome patients ( 58 ). Muscle visualization technique is not currently performed in TMJ US, but would help in differential diagnosis, mainly in cases when maxillofacial surgeons find no conclusive elements at clinical evaluation, MRI or CT exams in patients reporting TMJ disturbs.…”

Section: Methodsmentioning

confidence: 99%

The Role of Ultrasound in Temporomandibular Joint Disorders: An Update and Future Perspectives

et al. 2022

View full text Add to dashboard Cite

Temporomandibular joint (TMJ) disorder is the second most common chronic pain condition affecting the general population after back pain. It encompasses a complex set of conditions, manifesting with jaw pain and limitation in mouth opening, influencing chewing, eating, speaking, and facial expression. TMJ dysfunction could be related to mechanical abnormalities or underlying inflammatory arthropathies, such as rheumatoid arthritis (RA) or juvenile idiopathic arthritis (JIA). TMJ exhibits a complex anatomy, and thus a thorough investigation is required to detect the TMJ abnormalities. Importantly, TMJ involvement can be completely asymptomatic during the early stages of the disease, showing no clinically detectable signs, exposing patients to delayed diagnosis, and progressive irreversible condylar damage. For the prevention of JIA complications, early diagnosis is therefore essential. Currently, magnetic resonance imaging (MRI) is described in the literature as the gold standard method to evaluate TMJ. However, it is a high-cost procedure, not available in all centers, and requires a long time for image acquisition, which could represent a problem notably in the pediatric population. It also suffers restricted usage in patients with claustrophobia. Ultrasonography (US) has emerged in recent years as an alternative diagnostic method, as it is less expensive, not invasive, and does not demand special facilities. In this narrative review, we will investigate the power of US in TMJ disorders based on the most relevant literature data, from an early screening of TMJ changes to differential diagnosis and monitoring. We then propose a potential algorithm to optimize the management of TMJ pathology, questioning what would be the role of ultrasonographic study.

show abstract

“…The sample size was calculated based on a previous study investigating the thickness of masseter muscles in patients with and without temporomandibular joint dysfunction 21 . We assumed that a variation among certain demographic factors led to a mean difference of 0.9 mm in muscle thickness with a standard deviation of 0.5 mm.…”

Section: Sample Size Calculationmentioning

confidence: 99%

Ultrasound measurements of superficial and deep masticatory muscles in various postures: reliability and influencers

Chang

Chen

Chang

et al. 2020

Sci Rep

View full text Add to dashboard Cite

Masticatory muscle thickness provides objective measurements of the oral motor function, which may change in patients with oral myofascial pain. In this study, we aimed to establish a reliable ultrasound (US) protocol for imaging the superficial and deep masticatory muscles and to identify the potential influencers of the measurements. Forty-eight healthy participants without orofacial pain were enrolled. The intra-and inter-rater reliabilities of US measurements for masseter, temporalis, and lateral pterygoid muscles were assessed. Intraclass correlation coefficients for all muscles were greater than 0.6. The generalised estimating equation was used to analyse the impact of age, gender, laterality, and body mass index on the measurements, whereby age and body mass index were likely to be associated with an increase in masticatory muscle thickness. The thickness tended to be lesser in females. Laterality seemed to exert minimal influence on masticatory muscle thickness. Our study shows acceptable reliability of US in the evaluation of superficial and deep masticatory muscle thickness. Future studies are warranted to validate the usefulness of US imaging in patients with oral myofascial pain syndrome. Temporomandibular disorder (TMD) is frequently observed in patients seeking dental treatment. It comprises various findings concerning the stomatognathic system, involving the temporomandibular joints, masticatory muscles, teeth, and ears 1,2. The prevalence of TMDs in the general population ranges from 34.9 to 42.4% across different studies 3,4 , and the incidence is more prevalent in females 5. Of note, oral myofascial pain is commonplace in about 10-15% of patients with TMD 6. The aetiology of oral myofascial pain is still controversial. The proposed mechanisms include overuse of the masticatory muscles and a decrease in its pain threshold following central sensitization 7. While overuse might lead to hypertrophy of the masticatory muscles in the early stages, persistent pain could result in disuse atrophy in chronic cases 8. In this sense, masticatory muscle thickness provides objective measurements of the oral motor function 9 , which is supposed to change in patients suffering from oral myofascial pain. Several imaging modalities, such as computed tomography (CT), magnetic resonance imaging (MRI), and ultrasound (US) have been used to image the masticatory muscles. CT allows precise delineation of the skull bone where the masticatory muscles attach. However, radiation and poor resolution of the soft tissues make it unsuitable for muscle thickness measurements. Nowadays, MRI serves as the gold standard for depicting soft tissue pathologies 10 , but it is limited by its high cost and contraindications in patients with metal implants. US has various advantages over CT and MRI, i.e. real-time evaluation, zero radiation, cost-effectiveness, portability, and ease of dynamic examination 11. Further, it is capable of delineating muscle fibres-making it highly effective for imaging muscle trauma and neuromuscular diseas...

show abstract

Ultrasonographic Findings of Masseter Muscle in Females With Temporomandibular Disorders

Abstract: There were obvious ultrasonographic changes of the masseter muscle in females with MPD, which might be related to the muscle inflammation.

Cited by 10 publications

References 11 publications

Assessments of Muscle Thickness and Tonicity of the Masseter and Sternocleidomastoid Muscles and Maximum Mouth Opening in Patients with Temporomandibular Disorder

Assessments of Muscle Thickness and Tonicity of the Masseter and Sternocleidomastoid Muscles and Maximum Mouth Opening in Patients with Temporomandibular Disorder

The Role of Ultrasound in Temporomandibular Joint Disorders: An Update and Future Perspectives

Ultrasound measurements of superficial and deep masticatory muscles in various postures: reliability and influencers

Contact Info

Product

Resources

About