Biological strategies for the prevention of periodontal disease: Probiotics and vaccines.

Probiotics have been considered as an adjunct to prevent and treat a variety of diseases. The ease of administration of probiotics and the fact that no adverse outcomes have been reported in the literature has promoted increasing interest from the research community for this preventive approach in a number of diseases, including periodontal diseases. Several preliminary human clinical trials have been conducted and have yielded promising results. Vaccination is another biological strategy considered for use in the prevention of periodontal diseases. To date, no vaccine trials have been conducted in humans to determine if this strategy would prevent alveolar bone loss or bacterial colonization by target pathogens. Although the available research appears promising, the current body of evidence is incomplete for both strategies. This review attempts to summarize the present status of these 2 biological strategies for the prevention of periodontal diseases.