Use of antimicrobial photodynamic therapy for treatment of deep caries in the primary dentition: a step-by-step technique report.

Antimicrobial photodynamic therapy (aPDT) is increasingly used in dentistry to treat a number of diseases. The procedure involves the activation of a photosensitizer by a visible light source to induce chemical reactions that create cytotoxic reactive oxygen species, cause oxidative stress, and result in inactivation of pathogenic microorganisms. The use of aPDT has been proven to reduce microorganisms present in dentin and therefore may be effective for treatment of deep caries. This case report describes the use of aPDT as an adjuvant therapy in the treatment of deep caries in the primary molar of a 7-year-old boy. The case also highlights the preservation of pulpal vitality-in accordance with the concepts of minimal intervention-as well as the reduction of chair time achieved by resolving the case in a single session, a factor that is important for the treatment of children.