Dental Materials and Mouth Protectors Quiz

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Questions and Answers

What is a common material used for custom-made mouth protectors?

  • Polymethyl methacrylate
  • Polyethylene terephthalate
  • Natural rubber
  • Poly(vinyl acetate)-polyethylene polymer (correct)

Which factor is NOT associated with the preference for custom-made mouth protectors?

  • Low speech impairment
  • Cleanliness
  • Taste or odor (correct)
  • Durability

How long is the typical mixing time for amine-accelerated sealants?

  • 10 to 15 seconds (correct)
  • 15 to 20 seconds
  • 5 to 10 seconds
  • 20 to 30 seconds

What is one of the main types of injuries that custom-made mouth protectors aim to prevent?

<p>Dental trauma (B)</p> Signup and view all the answers

Which of the following statements regarding sealants is incorrect?

<p>Sealants are not resistant to penetration. (C)</p> Signup and view all the answers

In which sport were most injuries reported to occur when athletes were not wearing mouth protectors?

<p>Soccer (D)</p> Signup and view all the answers

What thickness range do most mouth protectors have?

<p>1.6 to 3 mm (D)</p> Signup and view all the answers

What is a characteristic of the reapplication of sealant to correct defects?

<p>It involves the same procedure as the initial application. (D)</p> Signup and view all the answers

What is the primary purpose of applying fluoride gels?

<p>To prevent smooth-surface caries (C)</p> Signup and view all the answers

Why are pit and fissure sealants applied to posterior teeth?

<p>To prevent pit and fissure caries (B)</p> Signup and view all the answers

Which fluoride product can cause staining when used?

<p>Stannous fluoride (D)</p> Signup and view all the answers

What pH range is considered effective for minimizing acid etching of restorative materials?

<p>6 to 8 (B)</p> Signup and view all the answers

What is a recommended application time for APF gels to enhance effectiveness?

<p>4 minutes (C)</p> Signup and view all the answers

What secondary function can mouth protectors provide?

<p>Preventing damage from bruxism (C)</p> Signup and view all the answers

What is one of the compositions used in acidulated phosphate-fluoride (APF) gels?

<p>0.34% hydrogen fluoride (B)</p> Signup and view all the answers

Which type of preventive dental material is contraindicated for patients with tooth sensitivity?

<p>Acidulated phosphate-fluoride (APF) (C)</p> Signup and view all the answers

Which of the following best describes the viscosity of an effective fluoride gel?

<p>Viscous enough for ease of handling (A)</p> Signup and view all the answers

Which of the following is a feature of the thixotropic fluoride product mentioned?

<p>Thickening agents like polyacrylic acid (C)</p> Signup and view all the answers

What is a common property of fluoride varnishes used in dental applications?

<p>They help reduce orthodontic decalcification (A)</p> Signup and view all the answers

What is the main benefit of fluoride ions in preventive dental materials?

<p>Lowering the incidence of dental caries (B)</p> Signup and view all the answers

What common feature do fluoride gels, rinses, and varnishes share?

<p>All include sodium fluoride (A)</p> Signup and view all the answers

Which material is used as a mouth protector?

<p>Custom-fabricated thermoplastic materials (B)</p> Signup and view all the answers

What property of sodium fluoride products makes them effective in dental care?

<p>Enhancing tooth remineralization (D)</p> Signup and view all the answers

Which of the following is a possible source of mouth protectors?

<p>Custom-fitted options from dental professionals (C)</p> Signup and view all the answers

What is a primary purpose of sealants applied to teeth?

<p>To seal cracks, pits, and fissures on occlusal surfaces. (D)</p> Signup and view all the answers

What is a common factor contributing to the high incidence of dental caries in children aged 5 to 17 years?

<p>Presence of pits and fissures. (B)</p> Signup and view all the answers

What should be done immediately after the application of APF gels?

<p>The patient should refrain from eating for 30 minutes. (B)</p> Signup and view all the answers

What can cause incomplete enamel coalescence that leads to caries?

<p>Deep pits and fissures on the enamel surface. (A)</p> Signup and view all the answers

What type of burs can be used to prepare fissures for preventive resin restoration?

<p>Fissurotomy burs, carbide burs, or air abrasion. (B)</p> Signup and view all the answers

Which of the following statements about fluoride and plaque control programs is true?

<p>Their effectiveness in preventing caries has not been fully established. (C)</p> Signup and view all the answers

Why are rinses not recommended for children younger than 6 years after applying sealants?

<p>Rinsing can wash away the gel prematurely. (A)</p> Signup and view all the answers

What are APF gels used for in dental treatments?

<p>To protect teeth from caries during the application process. (C)</p> Signup and view all the answers

Which type of mouth protector is preferred by players?

<p>Custom made (C)</p> Signup and view all the answers

What is a common issue with improperly fabricated custom-made protectors?

<p>Increased gagging and irritation (A)</p> Signup and view all the answers

What is the result of increased thickness in a mouth protector?

<p>Increased energy absorption (C)</p> Signup and view all the answers

What issue is likely expected with all types of mouth protectors?

<p>Staining (B)</p> Signup and view all the answers

What process is used to form a mouth protector?

<p>Vacuum forming (A)</p> Signup and view all the answers

What is a characteristic of polyurethanes compared to other materials?

<p>Higher values of water sorption (C)</p> Signup and view all the answers

What common complaint might athletes have about harder mouth protector materials?

<p>Uncomfortable feel (D)</p> Signup and view all the answers

What is often a complication during the impression process for custom-made protectors?

<p>Bite through (A)</p> Signup and view all the answers

What is a characteristic of poly(vinyl acetate)-polyethylene materials?

<p>Easiest to fabricate (A)</p> Signup and view all the answers

What is the first step in the fabrication of mouth protectors?

<p>Taking an impression of the arch (C)</p> Signup and view all the answers

Which method is used to smooth the edges of the mouth protector?

<p>Flaming edges with a torch and moist fingers (D)</p> Signup and view all the answers

What should the model be trimmed to before the thermoplastic material is formed over it?

<p>3 mm short of the labial fold (A)</p> Signup and view all the answers

What is the purpose of heating the center of the sheet of thermoplastic material?

<p>To allow the sheet to sag (B)</p> Signup and view all the answers

How is the mouth protector adjusted if the fit is not correct after forming?

<p>Using an alcohol torch on contacting surfaces (C)</p> Signup and view all the answers

What is the final step in the fabrication process of mouth protectors?

<p>Finishing the mouth protector (B)</p> Signup and view all the answers

What is done to the mouth protector before placing it in the athlete's mouth?

<p>It is dipped in warm water (C)</p> Signup and view all the answers

What position should the model be centered in during the vacuum forming process?

<p>On the vacuum former platform (B)</p> Signup and view all the answers

Flashcards

Preventive Dental Materials

Materials used to prevent dental disease or injury.

Fluoride

A chemical element that strengthens tooth enamel and helps prevent cavities.

Acidulated Phosphate Fluoride (APF)

A type of fluoride that is acidic. It's commonly used in gels.

Fluoride Gels

Fluoride gels are applied directly to teeth, often using trays.

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Fluoride Rinses

Fluoride rinses are liquids that are swished around in the mouth.

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Fluoride Varnishes

Fluoride varnishes are thin coatings that are applied to the teeth.

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Pit and Fissure Sealants

These sealants are applied to the pits and fissures of teeth, preventing food and bacteria from accumulating.

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Light-cured Sealant

A type of sealant that is cured with a special light.

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Application Duration of Fluoride Gels

The application of fluoride gel for a longer duration (4 minutes) is more effective than a shorter application (1 minute).

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Fissure

A groove or pit on the chewing surface of a tooth.

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Viscosity of Fluoride Gel

A viscous gel makes it easier to load into a tray and apply to teeth while still allowing for good contact with the tooth surface.

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Fluoride Varnish and Orthodontic Treatment

Fluoride varnishes are effective at reducing the weakening of tooth enamel that can occur during orthodontic treatment.

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Mouth Protector Purpose

A mouthguard is a device that covers teeth to protect them from impact during sports activities or other situations where injury is possible.

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Amine-Accelerated Sealant

A type of sealant that requires mixing two components, a base and an initiator, for polymerization.

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Mouth Protector

A device worn in the mouth to protect teeth from injury during sports and other activities.

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Ethylene Vinyl Acetate (EVA)

A common material used for mouth protectors, known for its flexibility and durability.

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Custom-made Mouth Protector

A type of mouth protector that is custom-made to fit the individual's mouth.

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Pulpitis

A common condition affecting the pulp of the tooth, often caused by deep cavities or trauma.

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Pulpal Necrosis

The death of the pulp tissue within the tooth.

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Replacement Resorption

The process of replacing old tooth structure with new bone tissue.

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Pits and fissures

These are tiny grooves or cracks on the chewing surface of teeth, especially molars and premolars.

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Debris collection in pits and fissures

This is a common problem where debris gets stuck in pits and fissures, leading to tooth decay.

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Lack of enamel coalescence

This refers to the incomplete formation of enamel, which can leave weak spots prone to decay.

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Dental caries

This is a common type of tooth decay that starts in the enamel and can quickly spread to other parts of the tooth.

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Fissurotomy

This technique uses a special drill to slightly widen the pits and fissures, making them easier to clean and seal.

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Air abrasion

Using a gentle abrasive material to clean and prepare the pits and fissures before applying sealant.

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Stock mouth protectors

Mouth protectors pre-formed and available in various sizes, often used in an emergency for protection.

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Mouth-formed mouth protectors

Mouth protectors formed in the mouth using heat and pressure, providing a better fit than stock protectors.

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Poly(vinyl acetate)-polyethylene materials

A material commonly used for mouth protectors, known for its ease of fabrication and comfort.

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Polyurethane mouth protectors

Polyurethanes are stronger, more durable, and absorb more energy than some other materials used for mouth protectors. They also absorb higher amounts of water.

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High processing temperatures for custom mouth protectors

Materials used to create custom-made mouth protectors often need to be heated to a higher temperature for molding.

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Discomfort and speech impairment with mouth protectors

Although effective at preventing injury, mouth protectors can sometimes cause discomfort or interfere with speech, especially if not properly fitted.

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Deformation of mouth protectors

Repeated use and pressure can cause mouth protectors to deform, potentially reducing their effectiveness.

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Impression Taking in Mouth Protector Fabrication

First, an impression of the upper jaw is taken using alginate, a type of rubber-like material.

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Pouring the Model

The alginate impression is poured with plaster or stone to create a model of the upper jaw.

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Forming the Thermoplastic

A thermoplastic sheet is heated until it becomes pliable and then carefully formed over the model of the upper jaw.

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Finishing the Mouth Protector

The final step involves trimming, smoothing, and ensuring the mouth protector fits comfortably in the athlete's mouth.

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Heating the Thermoplastic

The thermoplastic sheet is clamped into a frame beneath a heating element and allowed to sag in the center.

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Trimming the Model

To prevent the mouth protector from being too long, the model's edges are trimmed with surgical scissors.

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Smoothing the Mouth Protector

The edges of the formed mouth protector are smoothed using a moist finger, a special buffing wheel, or a laboratory lathe.

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Adjusting the Mouth Protector

After the initial fitting, adjustments are made by heating specific areas with an alcohol torch and re-fitting the mouth protector.

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Study Notes

Dental Materials: Preventative

  • Studies show fluoride lowers dental caries
  • Fluoride can be used as gels, trays, or varnishes

Fluoride Gels, Rinses, and Varnishes

  • Composition:
    • Acidulated phosphate fluoride (APF) gels: 2% sodium fluoride, 0.34% hydrogen fluoride, 0.98% phosphoric acid
    • Sodium fluoride and stannous fluoride gels also available
    • Varnishes containing 5% sodium fluoride are also available
  • Properties:
    • APF gels may cause tooth sensitivity and worsen it
    • Neutral topical sodium fluoride foam, gels and rinses available
    • One product is thixotropic, containing sodium fluoride and thickening agents (polyacrylic acid and a gum)
    • pH adjusted between 6 and 8
    • Stannous fluoride products are effective but can stain teeth
  • Clinical Effectiveness:
    • Clinical effectiveness varies by application method and frequency

Pit and Fissure Sealants

  • Composition and Reaction (Light-cured):
    • Primarily resins with light-activated polymerization (490 nm wavelength)
    • One-component systems, no mixing needed
  • Composition and Reaction (Self-cured):
    • Two-component systems
    • One component contains monomer and benzoyl peroxide initiator
    • Another component contains diluted monomer with 5% organic amine accelerator
  • Properties:
    • Penetration into fissures and etched enamel improves retention
    • Complete fissure filling can be challenging due to trapped air and debris
    • Acid etching improves sealant retention by cleaning, improving wettability, and increasing surface area for bonding
  • Clinical Significance:
    • Sealants aim to prevent caries in pits and fissures by creating a protective barrier
    • Fluoride and plaque control are not always effective in these areas

Mouth Protectors

  • Types and Composition:
    • Stock, mouth-formed, and custom-made
    • Materials may include thermoplastics, poly(vinyl acetate)-polyethylene (EVA), polyurethane, rubber latex, and vinyl plastisol
  • Advantages and Disadvantages of Mouth Protectors:
    • Table provides comparisons based on fit, thickness, durability, comfort, ease of speaking, and cost
    • Custom-made protectors are generally preferred by athletes, with advantages including superior fit, comfort, and cleanliness

Sealants: Manipulation

  • Steps for applying sealants:
    • Clean, etch, and dry the occlusal surface
    • Apply sealant to pits and fissures
    • Polymerize the sealant
    • Finish the sealant, removing excess material

Sealant Properties

  • Sealants should offer resistance to penetration with an explorer tip
  • Defects corrected by repeating the procedure and applying sealant to faulty areas
  • Fluoride applied after sealant polymerization

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