Preventive and Desensitizing Material

Preventive and Desensitizing Materials

Introduction to Preventive Strategies in Dentistry

• CAMBRA - Stands for Caries Management By Risk Assessment.

  • Aims to prevent dental diseases and maintain optimal oral health.

  • Involves assessing risks to tailor preventive strategies.

• Materials Used for Prevention:

  • Include both prescription and over-the-counter (nonprescription) agents.

  • Auxiliary staff often tasked by dentists to assist in dispensing, applying, fabricating, and delivering preventive aids or devices.

Preventive Aids in Dental Practice

• Dental Assistants (DAs) and Dental Hygienists (DH) have vital roles in disease prevention and health maintenance.

• Important preventive measures include:

  • Fluorides

  • Antibacterial mouth rinses

  • Sealants

Fluoride as a Preventive Agent

• Definition: Fluoride is a naturally occurring mineral.

• Effectiveness: Known to be effective and safe in the prevention of dental decay.

  • Can occur naturally or through supplementation.

Fluorosis and Its Implications

• Mild/Moderate Fluorosis: Results in opaque white spots or bands on teeth.

• High Levels of Fluoride: Can lead to severe fluorosis characterized by brown staining and pitting of enamel (also known as mottled enamel).

  • High fluoride occurrence usually found in water above optimal levels of 2 ppm.

• Optimal fluoride level in drinking water in the US: 0.7 ppm.

• Causes: Excess fluoride consumed during tooth formation can result in fluorosis.

Topical and Systemic Effects of Fluoride

• Tooth structure: Enamel and dentin made of tiny mineral crystals (hydroxyapatite) within a protein-lipid matrix.

  • Demineralization: The loss of mineral content from teeth occurs due to acidic attacks, leading to increased porosity and bacterial entry, initiating caries development (incipient caries).

• Reevaluation of Fluoride's Role:

  • Historically thought that fluoride incorporation at development reduced caries.

  • Current studies indicate topical fluoride exposure post-eruption more beneficial.

• Key Processes:

  • Remineralization: The process by which lost minerals are replaced.

  • Fluorapatite: A tooth mineral that forms when fluoride integrates into hydroxyapatite, enhancing resistance to acid demineralization.

Applications of Fluoride

• Fluoride obstructs acids produced by cariogenic bacteria, making demineralization difficult.

• Sources:

  • Dietary sources and topical agents including toothpastes, mouth rinses, and in-office treatments.

  • Remains in saliva, extending its topical benefits for several hours post-application.

Antibacterial Rinses in Caries Control

• Therapeutic Mouth Rinses: Target bacteria associated with dental caries; however, they supplement rather than replace mechanical plaque removal.

• Fluoride and Antibacterial Rinses:

  • Efficacy increases when combined with antibacterial rinses.

  • Chlorhexidine gluconate (Peridex): Prescription mouth rinse known for broad-spectrum effectiveness against bacteria, though side effects include brown staining on teeth and bitterness.

Delivery Methods of Fluoride

1. Dietary Fluoride Supplements:

   • Forms: Tablets, drops, or lozenges.

   • Consider total fluoride exposure in children.

   • Recommended alternatives for non-fluoridated water supplies include fluoride in table salt.

2. In-Office Fluoride Applications:

   • Topical gels or foams, historically applied for 4 minutes; ADA does not recommend single minute applications.

   • Effectiveness: 1-2 office treatments/year shown to result in 20-26% caries reduction.

   • Types:

   • 2% neutral sodium fluoride (NaF) preferred with adults.

   • 5% varnish: Lasts 1-3 days post-application.

3. Self-Applied Topical Products:

   • Recommended for high-risk individuals, including orthodontic patients to prevent demineralization.

   • Available as 1.1% neutral sodium fluoride or 0.4% stannous fluoride.

   • Application more effective in trays versus brushing to ensure contact.

4. Fluoride-Containing Toothpaste:

   • Concentration: ~1000 ppm.

   • Recommendations for children aged 6 and under: Supervised brushing with a pea-sized amount to mitigate risks of fluorosis.

5. Prophylaxis Pastes and Miscellaneous Uses:

   • Abrasiveness can remove stains but also some enamel.

Silver Diamine Fluoride (SDF)

• FDA Approval: Approved in 2014 for dentinal hypersensitivity, used internationally for over 80 years.

• Properties:

  • Fluoride’s anti-cariogenic effect alongside silver’s antimicrobial effects.

  • Effective at caries arrest in over 90% of lesions with biannual applications.

  • Non-invasive and cost-effective.

• Application Considerations:

  • Only target areas of decay; proper isolation is necessary to avoid staining.

  • Possible color changes (darker shades post-application) may require cover if desired.

Pit and Fissure Sealants

• Comprised of unfilled or lightly filled resins.

• Used to seal non-carious pits and fissures; effective in preventing caries.

  • Classify as G.V. class 1 in restorations, aimed for early-stage, incipient enamel problems.

Indications for Sealants

• Not all teeth are suitable; consider patient’s age, oral hygiene, caries risk, and tooth morphology.

• Recommended for teeth showing susceptibility in the primary dentition or those with high caries risk, especially on steep or deep fissures.

Susceptibility of Teeth to Fissure Caries

• Lower molars: 50% susceptibility

• Upper molars: 35-40% susceptibility

• Other teeth show varying levels of risk depending on anatomy and occlusion.

Composition and Placement of Sealants

• Chemically akin to composite resins; polymerization can be activated by chemical reactions or light.

• Steps in placement involve cleaning, etching, drying, and bonding, with meticulous control of moisture essential for success.

Sealant Troubleshooting and Effectiveness

• Properly placed sealants can prevent decay, but failures usually occur within 3-6 months.

• Excess material can lead to partial loss or entrapment in interproximal spaces.

Desensitizing Agents for Tooth Sensitivity

• Tooth sensitivity is often experienced from cold substances, sugars, and environmental factors.

• Desensitizing materials can be applied by patients (OTC) or professionals to mitigate sensitivity.

Mechanism and Causes of Sensitivity

• Sensitivity arises typically from recessed gums exposing dentinal tubules.

• Common triggers: cold temperatures, sugars, acidic foods.

• Other causes include:

  • Abrasion from improper brushing

  • Loss of enamel from diet or acids (known as erosion)

  • Loss from grinding/loading mechanics (termed abfraction)

  • Necessary interventions for tooth decay or cracks.

Treatment Modalities

• Two primary modalities:

  1. Occlusion: Plugging open tubules to reduce fluid movement.

  2. Desensitization: Neurological approach using compounds like potassium nitrate to inhibit nerve response.

Types of Desensitizing Agents

• Include:

  • Fluoride gels and varnishes

  • Inorganic salt solutions

  • Resin primers and bonding agents

  • Mineralizing agents and glass ionomer

Efficacy of Desensitizing Agents

• Most toothpastes require repeated applications for meaningful symptomatic relief.

• Inorganic salts and resin materials can yield immediate results, but none offer permanent relief.

Remineralization Process

• Refers to repairing tooth structure after loss of minerals due to exposure to various acids.

• Prominent products can include fluorides and those containing calcium or phosphates to restore minerals.

  • Examples: MI Varnish combines fluoride with amorphous calcium phosphate, and Glass Ionomer (GI) cements release fluoride.

Conclusion and Summary

• Preventive practices extend beyond basic cleaning, with caries risk assessments guiding topical fluoride and sealant application.

• As people retain their teeth longer, the use of desensitizing agents is critical for maintaining comfort and overall oral health.