Intraoral Appliance (IOA) Model Evaluating the Efficacy of a Whitening Toothpaste

This in situ intraoral appliance (IOA) model evaluates anticaries potential by exposing demineralized enamel specimens to oral conditions while allowing for ex vivo treatment assessments. Subjects wore acrylic palatal appliances containing four enamel specimens covered with steel gauze to promote plaque formation. Each of the three treatment periods lasted nine days and included twice-daily toothbrushing and dentifrice slurry swishing, plus three daily sucrose challenges. A minimum 4-day fluoride-free washout preceded each period. Post-treatment specimens were analyzed for %SMHR and enamel fluoride concentration.

Inclusion criteria

• Adults ≥18 years
• Good general and oral health
• Normal unstimulated salivary flow (≥1.5 mL/5 min)
• Functional dentition
• Oral conditions adequate to support the palatal appliance
• Ability to comply with brushing, slurry, appliance wear, and sucrose challenge procedures

Exclusion criteria

• Inability to tolerate appliance
• Oral pathology that interferes with participation
• Antibiotic use that violates withdrawal criteria
• Use of fluoride toothpaste during washout
• Participation in another appliance study in the past 4 weeks