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Photodynamic Therapy Research Studies · Journal article
Materials Today Bio · August 18, 2026
Encouraging direction, but not yet definitive.
D-lysine-derived cationic carbon dots (Lys-CDs) generate reactive oxygen species under blue-light irradiation and achieved over 99% bacterial killing and 70% biofilm thickness reduction in mature Streptococcus mutans biofilms in vitro, with evidence of caries inhibition in a rat model. This represents a proof-of-concept for photodynamic biofilm control but requires validation in human clinical trials before clinical application.
Preclinical in vitro biofilm study combined with animal efficacy model. In vitro: mature Streptococcus mutans biofilms. In vivo: rat caries model. No human subjects enrolled.. Intervention: D-lysine-derived cationic carbon dots (Lys-CDs) under blue-light irradiation (450 nm).
In mature S. mutans biofilms, Lys-CDs + light achieved over 99% bacterial killing Biofilm thickness reduced by approximately 70% following Lys-CDs + light treatment Lys-CDs exhibit favorable cytocompatibility under tested conditions
Cytocompatibility assessed only under 'tested conditions'; full safety profile in human oral tissues not established
This work provides mechanistic and animal model evidence for a novel photodynamic approach to cariogenic biofilm control. Progression to human clinical trials would be required to assess safety, efficacy, feasibility of topical application, and real-world effectiveness in dental caries prevention.
Sound preclinical study with in vitro biofilm efficacy and in vivo proof-of-concept in a rat caries model, but limited to animal data and lacks human clinical validation.
As stated by the source record.
Quoted from the source exactly as published.
This work provides mechanistic and animal model evidence for a novel photodynamic approach to cariogenic biofilm control. Progression to human clinical trials would be required to assess safety, efficacy, feasibility of topical application, and real-world effectiveness in dental caries prevention.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Bacterial infections remain a major threat to human health and are often difficult to eradicate once bacteria establish structured communities. In the oral cavity, this challenge is exemplified by dental caries, a highly prevalent chronic infectious disease driven by cariogenic biofilms dominated by Streptococcus mutans ( S. mutans ). To develop an efficient antimicrobial strategy for cariogenic biofilms, we synthesized D-lysine-derived cationic carbon dots (Lys-CDs) through a facile hydrothermal method and investigated their photodynamic antibacterial activity. The resulting Lys-CDs are water-dispersible and exhibit favorable cytocompatibility under the tested conditions. Their positive surface charge enhanced association with biofilm-associated bacterial communities. Under blue-light irradiation (450 nm), Lys-CDs generate abundant reactive oxygen species (ROS), inducing membrane destabilization and causing substantial structural alterations of mature biofilms. In mature S. mutans biofilms, Lys-CDs + light achieved over 99% bacterial killing, reduced biofilm thickness by about 70%, and increased ROS production. Mechanistic assays and transcriptomic profiling collectively suggested a ROS-driven multi-hit mode involving membrane permeabilization, oxidative stress amplification, and broad suppression of pathways associated with energy metabolism, envelope biogenesis, and stress regulation. In a rat caries model, topical Lys-CDs +light effectively inhibited caries progression. Collectively, this work provides experimental evidence supporting that biophilic cationic Lys-CDs can acts as a simple photodynamic strategy for cariogenic biofilms control and attenuate caries development under the investigated experimental conditions.
Taken from the source record, never inferred. Follow any of these and new work involving them reaches your briefing.