What effect is observed in sealed teeth regarding pulpal irritation?

• A. More irritation
• B. Less irritation
• C. No change
• D. Uncertain

Answer: (B)

When dentin is properly sealed, the pulp is less irritated because the seal lowers dentin permeability and blocks diffusion of irritants from the restoration and any microbial byproducts. The dentin tubules are the pathway for fluid movement that can stimulate nerve endings in the pulp; sealing dampens this fluid flow, so the stimuli reaching the pulp are reduced. Additionally, the barrier created by varnish, liners, or adhesive cements minimizes contact of potentially irritating substances, like resin monomers or acids, with the pulp. Together, these factors lead to less pulpal irritation in sealed teeth.