When the patient is hearing-impaired.
Plunkett
Lance R
LR
D003143:Communication Devices for People with Disabilities; D003730:Dental Care for Persons with Disabilities / Q000331:legislation & jurisprudence; D006297:Health Services Accessibility; D006801:Humans; D019986:Persons with Hearing Disabilities; D012017:Referral and Consultation / Q000331:legislation & jurisprudence; D012813:Sign Language; D014481:United States