Podcast
Questions and Answers
What is the primary chemical mechanism behind the adhesion of glass ionomer cements to tooth structure?
What is the primary chemical mechanism behind the adhesion of glass ionomer cements to tooth structure?
- Ionic bonding between the polyalkenoic acid and calcium ions in the tooth. (correct)
- Formation of covalent bonds between the cement and collagen.
- Micromechanical retention via resin tags penetrating the etched enamel surface.
- Entanglement of polymeric chains within the dentinal tubules.
In the manipulation of polycarboxylate cement, what effect would using a powder/liquid ratio with a higher proportion of liquid have on the cement's properties?
In the manipulation of polycarboxylate cement, what effect would using a powder/liquid ratio with a higher proportion of liquid have on the cement's properties?
- Decreased setting time and increased compressive strength.
- Increased viscosity and improved handling characteristics.
- Increased setting time and reduced compressive strength. (correct)
- No significant effect, as the ratio is not critical for this cement type.
Which of the following best explains why cooling the glass slab during the mixing of polycarboxylate cement can increase its setting time?
Which of the following best explains why cooling the glass slab during the mixing of polycarboxylate cement can increase its setting time?
- Cooling promotes the cross-linking of polymer chains, leading to faster setting.
- Cooling accelerates the polymerization process of the polyacrylic acid.
- Lower temperatures decrease the solubility of zinc oxide, slowing the reaction. (correct)
- The exothermic reaction is intensified to increase setting time.
What is the primary reason glass ionomer cements are considered anti-cariogenic?
What is the primary reason glass ionomer cements are considered anti-cariogenic?
Which of the following is the main role of the mineral fillers included in resin cements?
Which of the following is the main role of the mineral fillers included in resin cements?
What is the primary purpose of etching both the restoration and tooth surface when using adhesive resin cement?
What is the primary purpose of etching both the restoration and tooth surface when using adhesive resin cement?
Which component is uniquely present in resin-modified glass ionomer cements (RMGICs) compared to conventional glass ionomer cements (GICs)?
Which component is uniquely present in resin-modified glass ionomer cements (RMGICs) compared to conventional glass ionomer cements (GICs)?
Compared to adhesive resin cements, what is a key advantage of compomers related to their long-term performance in oral conditions?
Compared to adhesive resin cements, what is a key advantage of compomers related to their long-term performance in oral conditions?
A clinician is cementing an all-ceramic onlay. Which type of resin cement would be MOST appropriate for this procedure, considering its properties and indications?
A clinician is cementing an all-ceramic onlay. Which type of resin cement would be MOST appropriate for this procedure, considering its properties and indications?
A dental professional is preparing to cement a crown on a patient with high caries risk. Considering the properties of available luting agents, which cement would offer the MOST significant advantage in terms of caries prevention?
A dental professional is preparing to cement a crown on a patient with high caries risk. Considering the properties of available luting agents, which cement would offer the MOST significant advantage in terms of caries prevention?
A dentist is about to bond orthodontic brackets. Which cement material characteristic is MOST crucial for preventing failures during orthodontic treatment?
A dentist is about to bond orthodontic brackets. Which cement material characteristic is MOST crucial for preventing failures during orthodontic treatment?
When using dual-cured resin cement, adequate light curing is still essential. What is the MOST critical reason for light-curing a dual-cured resin cement, even though it self-cures?
When using dual-cured resin cement, adequate light curing is still essential. What is the MOST critical reason for light-curing a dual-cured resin cement, even though it self-cures?
A patient reports sensitivity after cementation of a crown with adhesive resin cement. What could be a contributing factor related to the material's properties or application?
A patient reports sensitivity after cementation of a crown with adhesive resin cement. What could be a contributing factor related to the material's properties or application?
Flashcards
Glass Ionomer Cement
Glass Ionomer Cement
Tooth-colored cement that bonds ionically, releases fluoride, and prevents caries.
Glass Ionomer Applications
Glass Ionomer Applications
Esthetic fillings, eroded areas, class V restorations, luting, liners, and bases.
Polycarboxylate Cement
Polycarboxylate Cement
First adhesive dental cement, using zinc oxide & polyacrylic acid for bonding.
Polycarboxylate Applications
Polycarboxylate Applications
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Resin Cements
Resin Cements
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Adhesive Resin Cement
Adhesive Resin Cement
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Light-Cured Resin Cement
Light-Cured Resin Cement
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Dual-Cured Resin Cement
Dual-Cured Resin Cement
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Adhesive Resin Cement applications
Adhesive Resin Cement applications
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Resin-Modified GIC Uses
Resin-Modified GIC Uses
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Resin-Modified GIC Composition
Resin-Modified GIC Composition
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Compomer Powder Composition
Compomer Powder Composition
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Compomer Liquid Composition
Compomer Liquid Composition
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Study Notes
- Dental cements are based on polyalkenoic acid
Glass Ionomer Cement
- Adhesive, teeth-colored, and anti-cariogenic cements.
- Name is derived from the glass powder and ionic bond setting reaction that creates adhesive bonding to the tooth structure.
- Used as an anterior aesthetic restorative material for class III cavities.
- Used for eroded areas and class V restorations.
- Used as a luting agent and as liners and bases.
- Requires conditioning of the tooth surface.
- Proper manipulation involves mixing powder and liquid (supplied in two bottles or pre-measured capsules) using a trituration (mixer).
- Cement needs protection during setting.
- Finishing step required.
Polycarboxylate Cement
- It is the first adhesive material developed in dentistry
- Has 2 main reactive ingredients, zinc oxide and polyacrylic acid, both in powder form; water is added to the bottle by the dentist.
- The powder contains only zinc oxide in other available products, where the liquid is an aqueous solution of polyacid.
- Primary use for luting permanent restorations.
- Also used as liners and bases, and in cementation of orthodontic bands.
- Mixing time is 30-40 seconds.
- Setting time is 7-9 minutes, which can be increased by cooling the glass slab.
- Powder/liquid ratio is 1.5 powder to 1 liquid by weight.
Resin Cements
- Group of dental cements composed of poly methyl methacrylate PMMA or dimethyl acrylate.
- Made by mixing an acrylic monomer liquid with acrylic polymers and mineral fillers.
- Used to bond laboratory-made dental appliances and restorations to teeth.
- The different classifications are:
- Adhesive Resins
- Resin-Modified Glass Ionomer Cements
- Compomers
Adhesive Resin Cement
- Available self-cured in 2-paste system (phosphonate cement): Bis-GMA Resin, Silanated quartz filler.
- Available light-cured in 1 component system: Bis-GMA or UrethaneDMA, Photo-initiator- Camphorquinone.
- Available dual-cured in 2 component system: Bis-GMA or UrethaneDMA, Photo-initiator- Camphorquinone.
- Used for cementation of conventional alloy crowns, bridges, and resin-bonded bridges.
- Used on All-ceramic inlays, onlays, and crowns
- Used on Orthodontic brackets.
- It isn't soluble.
- Shows adhesion (micromechanical).
- Available in multiple colors.
- Offers extended working time for light-polymerized and dual-polymerized options.
- Increased retention.
- Fluid/moisture control is critical.
- Manipulation includes etching the restoration and tooth surface, then cementing the restoration.
Resin Modified-GIC
- Used for permanent cementation of crowns and bridges, core build-up, liners, and bonding of orthodontic brackets.
- Liquid composition: polyacrylic acid and a hydrophilic (water-soluble) monomer like HEMA (hydroxy ethyl methacrylate).
- Powder composition: same as conventional GICs, with added initiators like camphorquinone.
Compomer
- Powder composition: fluorosilicate glass, sodium fluoride.
- Liquid composition: polymerized-methacrylate-carboxylic acid monomer, water, acrylate-phosphate monomer, diacrylate monomer.
- Can be polymerized through self-curing (chemical) or using light-cured initiators.
- Releases fluoride.
- Demonstrates low solubility.
- Exhibits high bond strength and fracture toughness/strength.
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