Term
| What is adhesions/bonding? |
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Definition
| the joining together of 2 materials using glue or cement |
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Term
| What is micromechanical bonding? |
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Definition
| roughness cannot be felt, surface irregularities cannot be seen by naked eye |
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Term
| What is an example of microechanical bonding? |
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Definition
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Term
| What is macromechanical bonding? Exmaple? |
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Definition
| roughness can be felt, cementing crown on tooth |
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Term
| Are undercuts needed if adhesion is being used for a restoration? |
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Definition
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Term
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Definition
| seeping of fluids and bacteria between tooth and restoration through the process of percolation and thermal expansion |
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Term
| What is postoperative sensitivity? |
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Definition
| pain caused by microleakage |
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Term
| What can microleakage cause? |
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Definition
| recurrent decays and staining around restoration |
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Term
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Definition
| micromechanical bonding technique used for the placement of composites and sealants |
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Term
| What is etching solution make of? |
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Definition
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Term
| Do deciduous or permanent teeth have to be etched longer? |
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Definition
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Term
| What should you do if the tooth becomes contaminated with saliva during etching? |
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Definition
| etch for 5 more seconds instead of 15 |
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Term
| WHat are polycarboxoxylate cements made of? |
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Definition
| polyacrylic acid and zinc oxide |
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Term
| What are glass ionomer cements made of? |
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Definition
| polyacrylic acid and glass powder, used now |
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Term
| What must you do to a surface before bonding a material to it? |
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Definition
| clean it, remove the smear layer |
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Term
| What do biofilms do to bonding? |
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Definition
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Term
| What is an adhesive bonding failure? |
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Definition
| adhesive comes off cleanly, occurs at interface, test of bond strength |
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Term
| What is a cohesive bonding failire? |
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Definition
| failure occurs inside the bonding material; measure of the strength of the bonding material |
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Term
| What is the roughened surface created by acid etching called? |
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Definition
| enamel tags or micropores |
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Term
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Definition
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Term
| What do we have to do before etching? |
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Definition
| clean the tooth surface with pumace |
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Term
| is acid etching used to bond materials to dentin? |
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Definition
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Term
| How does a tooth that has been properly etched appear? |
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Definition
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Term
| What do we do after acid etching? |
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Definition
| polymerize the surface- Apply a Resin systems (enamel bonding resin) |
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Term
| How does polymeriation work? |
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Definition
| light or chemical activated |
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Term
| What is Polymethyl methacrylate? |
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Definition
| the first low-viscosity resin system |
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Term
| What is another name for low viscosity resin system? |
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Definition
| enamel bonding resin/the adhesive |
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Term
| What is placed after the resin? |
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Definition
| the composite material which chemically bonds to the resin |
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Term
| How do dentinal bonding systems work? |
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Definition
| micromechanical bonding and secondary atomic bonds |
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Term
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Definition
| layer of debris produced when dentin is cut or prepared for a restoration |
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Term
| What was believed to be true of composites before the 1980's? |
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Definition
| that composites irritate the pulp so they should not be placed on dentin |
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Term
| Is it okay to etch dentin? |
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Definition
| yes, it used to be not allowed but now it is shown to cause no harm |
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Term
| What is the steps in the 3 step dentinal bonding system? |
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Definition
1.etch dentin and enamel(rinse then dry)
2.apply primer(DO NOT SET)
3.apply adhesive
4.place composite |
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Term
| What is primer? What does it contain? |
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Definition
-similar to low viscosity resins used in enamel bonding systems
-Contains solvent (acetone or ethanol) to improve flow and wetting of surface |
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Term
| What does etching dentin and enamel do? |
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Definition
-Removes smear layer
-Plugs of material forced into dentinal tubules
-Decalcifies a layer of dentin leaves collagen fibers exposed |
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Term
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Definition
| Resin that polymerizes by chemical reactive or light activated |
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Term
| What are the 2 dentinal bonding systems? |
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Definition
1.micromechanical bonding
2. formation of hybrid layer |
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Term
| What is micrmechanical bonding? |
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Definition
| resin material is locked in the dentinal tubules as resin tags, like the etching technique |
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Term
| What is the hybrid layer composed of? |
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Definition
| resin and decalcified dentin |
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Term
| What are glass ionomers? What are they made of? |
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Definition
-adhesive + restorative material
-polyacrylic acid and finely ground glass |
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Term
| What are glass iononer materials used for? |
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Definition
| cervical lesions in the enamel and dentin and for people with high caries risk |
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Term
| When are dentinal bonding systems usually used? |
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Definition
| when composite restorations are placed are are used to reduce sensitivity of exposed root surfaces of teeth |
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Term
| When is acid etching usually used? |
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Definition
| for sealants and to bond orthadontic brackets |
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Term
| Is it easier to bond to dentin or enamel? |
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Definition
| enamel because it is 90% calcified where dentin is only 50% |
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