Mutans streptococci dose response to xylitol chewing gum

Area of Science:

• Oral microbiology
• Dental caries prevention
• Pharmacodynamics

Background:

• Xylitol is a sugar substitute used in caries prevention.
• The optimal effective dose of xylitol for reducing mutans streptococci is not well-defined.
• Mutans streptococci are key etiological agents in dental caries.

Purpose of the Study:

• To determine the dose-response relationship between daily xylitol intake and levels of mutans streptococci.
• To investigate the effect of different xylitol doses on mutans streptococci in dental plaque and saliva.
• To assess the duration of xylitol's effect on mutans streptococci levels.

Main Methods:

• A randomized controlled trial with 132 participants.
• Four groups received different daily doses of xylitol gum (0 g, 3.44 g, 6.88 g, 10.32 g).
• Samples of dental plaque and unstimulated saliva were collected at baseline, 5 weeks, and 6 months for microbial analysis.

Main Results:

• Xylitol doses of 6.88 g/day and 10.32 g/day significantly reduced mutans streptococci in plaque by 10-fold at 5 weeks.
• These higher xylitol doses also led to significant reductions in plaque and saliva mutans streptococci at 6 months.
• No significant differences were observed in the saliva of the lower xylitol dose group at 5 weeks.

Conclusions:

• Daily xylitol intake of 6.88 g and 10.32 g effectively reduces mutans streptococci in dental plaque and saliva.
• The beneficial effects on microbial reduction are sustained for at least six months.
• A potential plateau effect in efficacy may occur between 6.88 g and 10.32 g of xylitol per day.