Urea Rinse effectively Neutralises Sucrose-induced Decrease in Plaque pH.

Area of Science:

• Biochemistry
• Dental Research
• Microbiology

Background:

• Dietary carbohydrates are metabolized by oral bacteria, producing acids that lower plaque pH.
• A sustained low pH in dental plaque is a primary factor in the development of dental caries.
• Interdental plaque pH telemetry is a method to monitor pH changes in specific oral environments.

Purpose of the Study:

• To evaluate the effectiveness of urea rinse in counteracting sucrose-induced decreases in interdental plaque pH.
• To assess the duration of pH neutralization provided by different concentrations of urea rinse.

Main Methods:

• Six participants with partial lower prostheses equipped with a miniature glass pH electrode were enrolled.
• Plaque was allowed to accumulate for 5-6 days on the electrode tip.
• Participants rinsed with sucrose solution, followed by either no rinse, water rinse, or urea rinses (0.25%, 0.50%, 1.00%), with plaque pH continuously monitored for 120 minutes.

Main Results:

• A sucrose rinse alone caused plaque pH to drop to 4.39 and remain below the critical pH of 5.7 for 80 minutes.
• A subsequent water rinse had minimal effect on the pH drop.
• All tested concentrations of urea rinse immediately and effectively neutralized the sucrose-induced pH decrease, maintaining pH above 5.7 for the entire observation period.

Conclusions:

• Urea rinse demonstrates significant potential in neutralizing the acidic conditions created by carbohydrate consumption.
• These findings suggest that regular use of low-concentration urea rinse after meals could be a viable strategy for caries prevention.
• Urea rinse offers a promising approach to manage oral pH and mitigate caries risk.