Study of root caries in an artificial mouth

Area of Science:

• Oral microbiology
• Dental research
• Caries pathogenesis

Background:

• Dental caries remains a significant global health issue, affecting both enamel and root surfaces.
• Understanding caries development requires accurate in vitro models that mimic oral conditions.
• Plaque biofilms are central to caries initiation and progression.

Purpose of the Study:

• To develop a robust laboratory model system for studying root and enamel caries.
• To compare the efficacy of multi-species bacterial consortia versus single species in inducing caries lesions.
• To evaluate the comparative effects of environmental versus tooth-integrated fluoride on caries development.

Main Methods:

• Development of artificial mouth system with plaque biofilms of four or six caries-associated bacterial species.
• Induction of caries lesions on enamel, dentine blocks, and intact root tissues.
• Application of fluoride at 5 ppm in the environment versus fluoride incorporated into tooth mineral.

Main Results:

• Multi-species biofilms induced caries lesions more effectively than single-species biofilms.
• Environmental fluoride (5 ppm) demonstrated significant suppression of enamel caries.
• Environmental fluoride was more effective than tooth-integrated fluoride in inhibiting both enamel and dentinal caries.

Conclusions:

• The artificial mouth model with multi-species biofilms effectively replicates in vivo-like caries lesions.
• Environmental fluoride offers superior protection against caries compared to fluoride integrated into tooth mineral.
• This study provides the first direct comparison of environmental versus tooth-integrated fluoride effects in a plaque biofilm model.