Residual cariogenic bacteria

Residual cariogenic bacteria refer to the diverse community of acid-producing microorganisms, primarily Streptococcus mutans and Lactobacillus species, that remain within the dentinal tubules or the floor of a cavity after the removal of carious tissue (Takahashi & Nyvad, 2011; Conrads et al., 2019). These bacteria possess the ability to survive in low-oxygen, nutrient-poor environments by metabolizing residual carbohydrates into organic acids, which further demineralizes the tooth structure (Takahashi & Nyvad, 2011). Their presence is a significant clinical concern as they can lead to secondary caries, restoration failure, and the progression of infection into the dental pulp (Schwendicke et al., 2016; Maltz et al., 2013). Therapeutic strategies involve the use of cavity disinfectants, such as chlorhexidine or silver diamine fluoride, which aim to eradicate these pathogens or inhibit their metabolic activity (Mei et al., 2013). Modern restorative materials may also incorporate antimicrobial agents to provide long-term suppression of these residual populations (Mei et al., 2013). Understanding the composition and survival mechanisms of this microbiota is essential for the success of minimally invasive dentistry and the preservation of tooth vitality (Schwendicke et al., 2016).

Other names

Residual bacteriaCariogenic microfloraDentin-invading bacteriaInfected dentin microbiotaResidual bacteria in carious dentin

Drugs targeting these bacteria typically act through the disruption of bacterial cell membranes, inhibition of essential metabolic enzymes such as enolase, and interference with bacterial adhesion and biofilm maturation.