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Antibacterial effects of light-cured liners
American Journal of Dentistry
|June 1, 1989
Summary
Two light-cured glass ionomers demonstrated antimicrobial properties against Streptococcus mutans, showing effectiveness linked to lower pH levels. Further research is needed to fully understand the role of fluoride release in their antibacterial activity.
Area of Science:
- Dental Materials Science
- Microbiology
Background:
- Light-cured liners and glass ionomers are novel dental materials.
- Their antimicrobial efficacy, particularly against Streptococcus mutans, remains largely unestablished.
Purpose of the Study:
- To evaluate the antimicrobial effectiveness of several light-cured liners against Streptococcus mutans.
- To investigate the relationship between fluoride release, pH changes, and antibacterial activity.
Main Methods:
- Agar diffusion methodology was employed to assess inhibition zones.
- Fluoride release and pH determination tests were conducted for each material.
Main Results:
- Two light-cured glass ionomers exhibited inhibitory effects on Streptococcus mutans.
- These effective liners released fluoride above the minimum inhibitory concentration of 20 ppm.
- Four other materials were ineffective, releasing insufficient fluoride and failing to lower pH below 4.0.
Conclusions:
- Light-cured glass ionomers demonstrate antibacterial activity against Streptococcus mutans, similar to conventional glass ionomers.
- Antibacterial action appears to be primarily dependent on achieving a lower pH.
- While fluoride release may contribute, its role is secondary to pH in the mechanism of action.