Occlusal Splint and Masticatory Muscle Injection in Myofacial Pain

Inclusion Criteria: * Indication of muscle pain according to the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD) diagnostic decision tree, * Having minimum three trigger points in the masseter muscles on palpation (active or latent), * No medical or surgical treatment for temporomandibular joint in the last 3 months, * No history of occlusal splint treatment, * Not had a masticatory muscle injection or dry needling before, * Absence of active caries and pulpal lesions, * No missing teeth other than the third molar, Exclusion Criteria: * Intra-Articular Disorders or Degenerative Joint Disease indication according to the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD) diagnostic decision tree, * Presence of active infection in the masseter trigger point area, * Being in the mixed dentition period, * The patient has used an occlusal splint before, * Known allergy to local anesthetics, * Having a needle phobia, * Presence of congenital head and neck deformity, * Having systemic joint disease, * Presence of cardiovascular disease, thyroid disease, diabetes, hypertension, renal failure, isolated muscle disease, rheumatological and neurological disease, * Having a history of trauma in the head and neck region in the last 2 years, * Presence of malignancy or having undergone head and neck radiotherapy/chemotherapy in the last 2 years, * Presence of bleeding disorder, * Use of analgesic, corticosteroid and anticonvulsant drugs, * Presence of fibromyalgia diagnosis, * Being treated by a neurologist for neurological disorders and/or neuropathic pain and/or headache, * Pregnancy or lactation, * Having a known psychiatric disorder and using antidepressants in the last 6 months, * Having drug and/or alcohol addiction, * Being under active orthodontic treatment.