The ideal remaining dentin thickness (RDT) of 2 mm is critical to adequately protect the pulp during restorative procedures. This thickness provides a sufficient natural barrier against thermal, chemical, and bacterial insults, minimizing the risk of pulp irritation or damage. Studies show that RDT less than 2 mm significantly increases the likelihood of pulpal inflammation due to increased permeability. Maintaining at least 2 mm of dentin ensures optimal insulation and mechanical support under restorations, contributing to long-term tooth vitality and restoration success.

Reference: Sturdevant’s Art and Science of Operative Dentistry, 7th Edition.