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42 Cards in this Set
- Front
- Back
What is cementation in dentistry?
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Attaching a restoration to natural teeth.
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What are the applications of cements?
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1. Luting agents-to bond preformed restorations & ortho materials
2. Cavity liners & bases-to protect the pulp and foundations for restorations 3. Restorative materials |
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What are the 3 classes of cements?
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1. Water based
2. Oil based 3. Resin based |
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What is provilink?
What are its characteristics? |
A dual-curing temporary cement
Cleans easily Good retention If you try to clean excess before curing, it will leak Shade A1 |
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What are the characteristics of glass ionomer cements?
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*Good biocompatibility
*Adheres to enamel & dentin ***It may have anticariogenic effect (release of fluoride)*** *Translucent cement *High mechanical properties *Susceptible to moisture contamination |
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What is the film thickness of glass ionomer cements?
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22-24 microns
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Glass ionomer cement...opaque, translucent or transparent?
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Radiolucent.
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What is the composition of glass ionomer cement?
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Finely ground aluminosilicate glass, polycarboxylate copolymer (liquid) & water.
A water-based cement. |
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What is the most popular indication for glass ionomers?
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Retention of alloy restorations.
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How is a hybrid ionomer different from a glass ionomer?
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Is glass reinforced with resin-stronger
It should be avoided with all-ceramic restorations( associated with fractur) Expensive |
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What is the composition of hybrid ionomer?
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Powder:
Radiopaque fluoroaluminosilicate glass & microencapsulated catalyst system Liquid: Polycarboxylic and tartaric acid Pendant methacrylate groups HEMA |
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What is the thickness of RelyX Luting, 3M ESPE?
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25 microns
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Zinc Polycarboxylate:
What is its film thickness? What is its main advantage? |
25-48 microns
One of the cheaper cements |
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What is the composition of zinc polycarboxylate?
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Powder:
Zinc oxide Liquid: Polyacrylic acid Water (water based) |
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Zinc Polycarboxylate:
Advantages & disadvantages? |
Adv:
1. Film thickness is between 25-48 microns 2. Relative biocompatibility Dis: 1. High viscosity (difficult to mix) 2. Inferior long-term retention 3. Short working time 4. More difficult to remove and provides less retention than zinc phosphate |
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What are the indications for zinc polycarboxylate?
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1. Retention of alloy restorations
2. Retention of orthodontic bands 3. High strength bases (Less irritating to the pulp) |
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What is the composition of Zinc Phosphate?
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Powder: Zinc oxide, Magnesium oxide, Pigments
Liquid: Phosphoric acid, Water (Al-Zn ions) |
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Zinc Phosphate:
Advantages & disadvantages? |
Adv:
Adequate strength 25 micrometers film thickness Reasonable working time Excess is easily removed Low cost Acceptable effect over the dental pulp Most popular cast for restorations Dis: High Acidity |
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What are the indications for Zinc Phosphate?
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1. Retention of alloy restorations
2. Retention of orthodontic bands 3. High-strength bases 4. Provisional retorations |
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Studies have shown zinc phosphate can successfully serve as a luting agent for as many as ________ years in select clinical situations.
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20 years
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What is the composition of Zinc Oxide-Eugenol?
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Powder:
Zinc oxide, Rosin, Zinc acetate Liquid: Eugenol |
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Zinc Oxide-Eugenol:
Advantages & disadvantages? |
Adv:
Good biocompatibility Excellent seal Film thickness 25-35 micrometers Easy to remove Dis: Inferior physical properties Short working time |
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What are the indications of Zinc Oxide-Eugenol?
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1. Low and high-strength bases
2. Provisional restorations 3. Temporary and permanent retention of restorations |
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Zinc Oxide with EBA:
Advantages & disadvantages? |
Adv:
Improved compressive strength Good biocompatibility & pulp protection Dis: Short working time Excess of material is difficult to remove |
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What is the composition of Zinc Oxide with EBA?
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Powder:
Zinc oxide, Rosin, Zinc acetate Liquid: 2-ethoxybenzoic acid (EBA) |
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What are the indications of Non-eugenol zinc oxide (EBA)?
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1. Temporary retention of restorations
2. Root canal sealers 3. Gingival tissue packs 4. Surgical dressings |
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What is the composition of Self-curing Calcium Hydroxide?
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Base paste:
Calcium tungstate, calcium phosphate, zinc oxide, glycol salicylate Catalyst paste: Calcium hydroxide, zinc oxide |
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What is the composition of light-curing Calcium Hydroxide?
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Urethane dimethacrylate resin, calcium hydroxide, barium sulfate fillers, monomer
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Calcium Hydroxide:
Advantages & disadvantages? |
Adv:
* Stimulate the formation of reparative dentin * Low thermal conductivity Stronger than zinc oxide-eugenol Dis: Low mechanical properties |
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What are the indications for Calcium Hydroxide?
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1. Low-strength base
2. Temporary retention of restorations 3. Used for direct and indirect pulp capping 4. Protective barrier beneath composite restorations (protect the pulp) |
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What is the composition of composite and adhesive resins?
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Dimethacrylate resin, Glass filler, microhybrid and microfilled
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Composites and adhesive resins:
Advantages & disadvantages? |
Adv:
Capable of bonding chemically to dentin Film thickness 13-20 micrometers More esthetics Acceptable biocompatibility High cost |
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What are the indications of composite and adhesive resins?
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1. Bonded conventional crown & bridge
2. Bonded ceramic and composite veneers, inlays & onlays 3. Bonded post & cores 4. Bonded Maryland bridges 5. Retention of provisional restorations 6. Retention of orthodontic brackets 7. High-strength bases |
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What is the composition of compomer?
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Powder:
Strontium Al fluorosilicate glass, Sodium fluoride, self-cured & light-cured initiators Liquid: Polymerizable methacrylate-carboxylic acid monomer, multifunct. acrylate-phosphate monomer, diacrylate monomer, water |
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4 Characteristics of compomer?
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1. High mechanical properties
2. Low solubility 3. Sustained fluoride release * 4. Can be recharged with fluoride |
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What are the indications of compomer?
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1. Cementation of cast alloy inlays onlays, crowns & bridges, PFM
2. *Contraindicated for all-ceramic restorations * (because of expansion) |
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Glass ionomer cements vs. Resin cements: Which has the higher compressive strength?
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Resin
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The ideal luting agent:
Working time? Adherence? Seal? Pulp compatibility? Strength? |
Long working time
Adheres well to both tooth structure and cast alloy Provides a good seal Nontoxic to the pulp Adequate strength properties |
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Ideal luting cement:
Viscosity? Solubility? Working and setting time? Excess? Cost? |
Compressible into thin layers
Low viscosity and solubility Good working and setting characteristics Any excess can be easily removed Inexpensive BTW-it does not exist |
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How do you prepare a tooth for cementation?
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Avoid contamination of material with water, blood or saliva
Both restoration and tooth should be dry Do not overdry-could damage odontoblasts Isolate the area Tooth should not be desiccated (dried excessively) With non-adhesive cement, use cavity varnish or dentin bonding resin |
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What is the frozen slab technique?
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Technique used to increase the working time yet reduce the setting time of zinc phosphate cement.
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Resin luting agents:
For veneers? For inlays & onlays? For full ceramic crowns? |
Veneers-light cured
Inlays or onlays-chemical or dual cure material Full ceramic crown-chemical or dual cure material |