Enamel-Caries Prevention Using Two Applications of Fluoride-Laser Sequence

Area of Science:

• Dental materials science
• Preventive dentistry
• Biomaterials engineering

Background:

• Fluoride and laser treatments show synergistic effects in reducing enamel solubility.
• Limited research exists on the optimal sequence and repeated application of combined fluoride-laser treatments for enamel protection.

Purpose of the Study:

• To investigate the effect of one versus two sequential applications of fluoride varnish and CO2 laser treatment on sound enamel's resistance to cariogenic challenge.
• To compare the preventive efficacy of the combined fluoride-laser treatment with fluoride varnish alone.

Main Methods:

• Sixty enamel slabs were divided into five groups: control, fluoride varnish only, one fluoride-varnish/CO2 laser application, and two fluoride-varnish/CO2 laser applications.
• Specimens underwent 9-day pH cycling simulating cariogenic conditions.
• Enamel demineralization was assessed using Knoop surface microhardness (SMH) testing.

Main Results:

• Both one and two applications of the fluoride-laser sequence significantly improved enamel resistance to acid attack compared to fluoride varnish alone.
• While two applications (F-L1 and F-L2) showed higher SMH values, significant resistance to demineralization was primarily achieved with repeated applications.

Conclusions:

• Sequential application of fluoride varnish and CO2 laser significantly enhances enamel's resistance to demineralization.
• Repeated applications of this combined treatment provide superior protection against cariogenic challenges compared to single applications or fluoride varnish alone.