Dental varnish
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The Effectiveness of Dental Varnish in Preventing Dental Caries
Introduction to Dental Varnish
Dental varnish, particularly fluoride varnish, has been widely used as a preventive measure against dental caries in children and adolescents. This article synthesizes findings from multiple studies to evaluate the effectiveness, safety, and cost-effectiveness of fluoride varnish in preventing dental caries.
Effectiveness of Fluoride Varnish in Caries Prevention
General Effectiveness
Fluoride varnish has been shown to significantly reduce the incidence of dental caries in both primary and permanent teeth. A comprehensive review involving 22 trials with 12,455 participants found that fluoride varnish reduced caries increments by 43% in permanent teeth and 37% in primary teeth . Another study with 2709 children reported a 46% reduction in caries increments in permanent teeth and a 33% reduction in primary teeth . These findings highlight the substantial caries-inhibiting effect of fluoride varnish.
Specific Studies on Permanent Molars
A 24-month cluster randomized controlled trial focusing on first permanent molars found that biannual application of fluoride varnish significantly reduced caries increments. The study reported a caries incidence of 17.0% in the test group compared to 23.7% in the control group, with a prevented fraction (PF) of 28.3% . This underscores the effectiveness of fluoride varnish in protecting newly erupted permanent molars.
Comparative Effectiveness: Fluoride Varnish vs. Sealants
Clinical Effectiveness
When comparing fluoride varnish to fissure sealants, studies have shown mixed results. A randomized controlled trial involving 1015 children found no significant difference in caries prevention between fluoride varnish and fissure sealants after 36 months . However, another review suggested that resin-based sealants might be slightly more effective than fluoride varnish in preventing caries in first permanent molars over a two-year period 810. Despite these findings, the evidence remains inconclusive due to variability in study designs and follow-up periods.
Cost-Effectiveness
In terms of cost, fluoride varnish has been found to be less expensive than fissure sealants. The same trial that found no significant difference in clinical effectiveness also reported that the mean cost per child was lower for fluoride varnish (£432) compared to fissure sealants (£500), resulting in a cost saving of £68.13 per child . This makes fluoride varnish a more cost-effective option for caries prevention in community health programs.
Safety and Acceptability
The safety profile of fluoride varnish is generally favorable, with no significant adverse effects reported in the included studies 132. Additionally, both fluoride varnish and fissure sealants were found to be acceptable to children, as indicated by high treatment adherence and positive feedback in qualitative interviews .
Conclusion
Fluoride varnish is an effective and cost-efficient method for preventing dental caries in children and adolescents. While it shows substantial benefits in reducing caries increments, particularly in newly erupted permanent molars, its comparative effectiveness to fissure sealants remains inconclusive. Nonetheless, its lower cost and high acceptability make it a valuable tool in public health dentistry. Further high-quality trials are needed to confirm these findings and explore potential adverse effects.
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