Table 2.

Helkimo clinical dysfunction index (Di). The maximum score recorded from each domain is added to determine the total clinical dysfunction index score. Abbreviations: MIO—maximum incisal opening; mm—millimeter.

Domain	Criteria	Score
Mandibular Mobility	MIO > 40 mm, excursions > 7 mm MIO > 30 mm, excursions > 3 mm MIO ≤ 30 mm, excursions ≤ 3 mm	0 1 5
TMJ Dysfunction	No sounds/deviation on opening Sounds and/or deviation > 2 mm Locking and/or luxation	0 1 5
Muscle Pain	No muscle pain Pain on palpation at 1–3 sites Pain on palpation at 4+ sites	0 1 5
TMJ Pain	No tenderness to palpation Lateral (superficial) TMJ pain Posterior (deep) TMJ pain	0 1 5
Mandibular Movement Pain	No pain Pain with 1 movement Pain with 2+ movements	0 1 5
Di 0: 0 points—absence of dysfunction
Di I: 1–4 points—mild dysfunction
Di II: 5–9 points—moderate dysfunction
Di III: 10–25 points—severe dysfunction