Which systemic disorder contributes to reduced salivary flow?

• A. Sjogren's syndrome
• B. Asthma
• C. Hyperthyroidism
• D. Osteoarthritis

Answer: (A)

Systemic autoimmune diseases that involve the salivary glands can directly reduce saliva production. Sjögren's syndrome is a classic exocrine autoimmune condition where lymphocytes infiltrate and destroy the salivary (and lacrimal) glands, leading to decreased saliva flow. This hypofunction of the glands causes dry mouth, which diminishes lubrication, buffering, and antimicrobial protection in the mouth, elevating the risk for caries and mucosal irritation. The other conditions listed are not typically linked to a persistent decrease in salivary flow: asthma affects the airways, hyperthyroidism alters metabolism and systemic function but does not inherently cause reduced saliva, and osteoarthritis is a joint disease with no direct impact on salivary glands. So, the disorder most associated with reduced salivary flow is Sjögren's syndrome.