Structures temporomandibular disorder (TMD) evaluation using the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD), imaging assessment, occlusal analysis, and evidence-based treatment protocols including splint therapy, physical therapy, and pharmacologic management.

Why This Skill Exists

Temporomandibular disorders affect 5–12% of the adult population, with women affected at twice the rate of men. TMD is the second most common musculoskeletal condition causing disability, after chronic low back pain. Yet TMD diagnosis is frequently delayed or incorrect because symptoms overlap with dental pain, headache, ear pathology, and cervical spine disease. Irreversible treatments — occlusal adjustment, full-mouth reconstruction, or TMJ surgery — performed without proper DC/TMD classification cause permanent harm.

The Diagnostic Criteria for TMD (DC/TMD), published in 2014, provides the validated, evidence-based framework for TMD diagnosis. This skill implements DC/TMD Axis I (physical diagnosis) and Axis II (psychosocial assessment) to structure the complete TMD workup, classification, and treatment algorithm.

Examination Component	Technique	Finding to Record
Maximum unassisted opening	Patient opens maximally without assistance	Distance in mm (incisal edge to incisal edge + overbite); normal ≥ 40 mm
Maximum assisted opening	Gentle pressure at incisors to push beyond unassisted	Distance in mm; pain (yes/no, location)
Lateral excursions	Right and left lateral movement	Distance in mm; normal ≥ 7 mm each side
Protrusion	Forward mandibular movement	Distance in mm; normal ≥ 7 mm
Opening pattern	Observe frontal view during opening	Straight, corrected deviation, uncorrected deviation, deflection
TMJ palpation	Lateral pole: finger placed over lateral pole, patient opens slightly; posterior attachment: finger in EAC, patient opens	Pain (yes/no, right/left)
Masticatory muscle palpation	Temporalis (anterior, middle, posterior); masseter (origin, body, insertion); lateral pterygoid area; medial pterygoid	Pain (yes/no, familiar pain yes/no)
Joint sounds	Stethoscope or palpation during opening/closing/lateral	Click (opening, closing, reciprocal); crepitus (fine, coarse)
Cervical muscle palpation	Sternocleidomastoid, trapezius upper fibers	Pain (yes/no) — screen for cervical contribution

Category	Diagnosis	Key Criteria
Pain disorders
	Myalgia (local, myofascial pain, myofascial pain with referral)	Pain in masticatory muscles modified by jaw movement/function; familiar pain on palpation
	Arthralgia	Pain in TMJ modified by jaw movement/function; familiar pain on TMJ palpation
	Headache attributed to TMD	Headache in temple region modified by jaw movement; familiar headache reproduced by TMD exam maneuvers
Joint disorders
	Disc displacement with reduction	Reproducible click during opening (with or without intermittent locking)
	Disc displacement without reduction with limited opening	History of locking; maximum assisted opening < 40 mm; contralateral excursion < 7 mm
	Disc displacement without reduction without limited opening	History of locking that resolved; no current limited opening
Degenerative joint disease
	Degenerative joint disease	Crepitus detected clinically; degenerative changes on imaging
	Subluxation	History of jaw "going out"; open lock that self-reduces or requires manual reduction

Instrument	What It Measures	Scoring Threshold
PHQ-9	Depression severity	≥ 10: moderate depression; ≥ 15: severe
GAD-7	Anxiety severity	≥ 10: moderate anxiety; ≥ 15: severe
Graded Chronic Pain Scale (GCPS)	Pain intensity and disability	Grade III–IV: high disability (requires interdisciplinary approach)
Jaw Functional Limitation Scale (JFLS)	Functional jaw limitation	Higher scores = greater functional limitation
Oral Behaviors Checklist (OBC)	Parafunctional habits	Identifies modifiable behaviors for behavioral therapy

Clinical Question	Imaging Modality	Justification
Screen for osseous pathology	Panoramic radiograph	First-line; demonstrates gross condylar morphology, asymmetry
Detailed osseous assessment	CBCT	Superior for condylar erosion, osteophytes, ankylosis, fracture
Disc position assessment	MRI (bilateral, open and closed mouth)	Gold standard for disc displacement; shows effusion, disc morphology
Arthritis/inflammatory assessment	MRI with gadolinium	Active synovitis, effusion quantification
Acute trauma	CT or CBCT	Fracture detection

Finding	Associated Diagnosis	Clinical Significance
Condylar flattening, osteophytes, sclerosis	Degenerative joint disease (osteoarthritis)	Common; correlates with crepitus on exam
Anterior disc position (closed mouth), disc recaptures on opening	Disc displacement with reduction	Explains reciprocal click; usually benign
Anterior disc position that does not recapture	Disc displacement without reduction	Explains locked jaw; may require intervention
Condylar erosion, irregularity	Active degenerative process	Correlate with symptoms; may indicate progressive disease
Bifid condyle, condylar hyperplasia	Developmental variant or growth abnormality	May explain asymmetry or progressive open bite

Managing Tmj Disorders

Managing Tmj Disorders

Why This Skill Exists

Checkpoint A: Pre-Evaluation Intake (Mandatory)

Documents to Request

Step 1: DC/TMD Axis I — Clinical Examination

Standardized DC/TMD Examination Protocol

DC/TMD Axis I Diagnostic Taxonomy

Step 2: DC/TMD Axis II — Psychosocial Assessment

Required Axis II Instruments

Axis II Implications for Treatment

Step 3: Imaging

Imaging Selection Algorithm

Key Imaging Findings

Step 4: Treatment — Conservative Management First

Evidence-Based Treatment Hierarchy

Pharmacotherapy for TMD

Occlusal Splint Therapy

Step 5: Surgical and Interventional Management

Surgical Indications — Only After Conservative Failure

Injection Therapies

Checkpoint B: Post-Treatment Alignment (Mandatory)

Quality Audit

Guidelines

Update Skills

Eval Harness

Ecc Tools Cost Audit

Code Tour

Rules Distill

Design System

Medication	Indication	Dose	Duration	Notes
NSAIDs (ibuprofen, naproxen)	Acute myalgia, arthralgia	Ibuprofen 400–600 mg TID; naproxen 500 mg BID	2–3 weeks	First-line for pain and inflammation
Cyclobenzaprine	Myalgia with muscle spasm	5–10 mg QHS	2–4 weeks	Low-dose preferred; sedating
Amitriptyline	Chronic myalgia, chronic pain	10–25 mg QHS	8+ weeks for full effect	Low-dose tricyclic; also helps sleep
Diazepam	Acute jaw spasm, trismus	2–5 mg BID-TID	1–2 weeks maximum	Short course only; dependency risk
Gabapentin	Neuropathic pain component	300–900 mg QHS	Titrate over weeks	Consider when pain has neuropathic features

Splint Type	Design	Indication	Duration
Stabilization splint (flat-plane)	Full-arch, flat occlusal surface, canine-guided	Myalgia, arthralgia, bruxism — first-line splint	Nighttime use; 3–6 months initial trial
Anterior repositioning splint	Mandible positioned forward	Disc displacement with reduction (when symptomatic)	Time-limited (2–4 weeks); risk of posterior open bite
NTI-tss (anterior bite plane)	Covers anterior teeth only	Acute pain relief; tension headache	Short-term only; risk of posterior tooth intrusion and anterior eruption
Soft splint	Flexible material	NOT recommended for TMD (may increase clenching)	Avoid for TMD patients

Procedure	Indication	Invasiveness	Expected Outcome
Arthrocentesis	Closed lock (disc displacement without reduction); joint effusion; persistent arthralgia	Minimally invasive (needle lavage)	70–80% improvement in pain and opening
Arthroscopy	Failed arthrocentesis; adhesions; disc displacement requiring lysis	Minimally invasive (camera + instruments)	80–90% symptom improvement
Open arthroplasty	Failed arthroscopy; severe DJD with loose bodies; ankylosis; tumor	Invasive (open joint)	Reserved for structural pathology
Disc repositioning / plication	Anterior disc displacement in young patients with locking	Moderately invasive	Outcomes variable; declining in frequency
Total joint replacement	End-stage DJD; ankylosis; failed prior surgery; significant condylar resorption	Major surgery	Significant improvement in function for properly selected patients

Agent	Target	Dose	Duration of Effect	Evidence
Corticosteroid (triamcinolone)	Intra-articular TMJ	10–20 mg per joint	4–12 weeks	Short-term pain relief; limit to 2–3 injections per year due to cartilage effects
Hyaluronic acid	Intra-articular TMJ	0.5–1 mL per joint	3–6 months	Moderate evidence for DJD; viscosupplementation
Botulinum toxin A (Botox)	Masseter, temporalis	25–50 units per muscle	3–4 months	Strong evidence for myalgia and bruxism; off-label
Trigger point injection (lidocaine)	Masticatory muscles	0.5–1 mL 1% lidocaine per trigger point	Days to weeks	Immediate pain relief; break pain cycle

#	Criterion	Pass / Fail
1	DC/TMD standardized examination performed with all components documented
2	Maximum opening, lateral excursions, and protrusion measured in mm
3	TMJ and masticatory muscle palpation with familiar pain assessment documented
4	DC/TMD Axis I diagnosis assigned from validated taxonomy
5	Axis II instruments (PHQ-9, GAD-7, GCPS, JFLS) administered and scored
6	Imaging ordered based on clinical indication, not routinely
7	MRI obtained when disc displacement assessment is clinically needed
8	Conservative management (education, self-care, PT, medication) offered as first-line
9	Stabilization splint used as first-line splint type (not soft splint)
10	Anterior repositioning splint used only time-limited with documented rationale
11	Irreversible treatments (occlusal adjustment, full-mouth rehab) avoided until diagnosis confirmed and conservative management exhausted
12	Behavioral therapy/CBT referral made for patients with high Axis II burden
13	Treatment outcomes measured at defined intervals using standardized instruments
14	Surgical referral made only after documented failure of 3–6 months conservative therapy