A study in patients with jaw muscle pain to compare ultrasound therapy alone versus ultrasound therapy with a pain relief gel, for relieving pain and improving mouth opening

INTERVENTION: Intervention1: Phonophoresis ‐ ultrasound with diclofenac gel: Phonophoresis ‐ ultrasound with diclofenac gel for temporomandibular disorder of muscle origin. Control Intervention1: Therapeutic ultrasound: Therapeutic ultrasound with normal ultrasound gel for temporomandibular disorder of muscle origin. CONDITION: Health Condition 1: M95‐ Other acquired deformities of musculoskeletal system and connective tissue PRIMARY OUTCOME: Mean change in Visual Analog Scale VAS pain score and Maximum mouth opening MMO in mms.Timepoint: Baseline T0, ; after each of the 4 weekly treatment sessions T1 to T4, ; one month follow up F1, 3 months follow up F2. SECONDARY OUTCOME: Proportion of participants achieving treatment success, defined as MMO greater than 35 mm and VAS less than 3 on a 10 point scale.Timepoint: i month and 3 months INCLUSION CRITERIA: 1.Clinical diagnosis of myogenous temporomandibular disorder per DC/TMD examination criteria 2.Able to comply with multiple follow‐up visits