Vet Dentistry
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| what is the most commonly used chelating agent in root canal treatment? | show 🗑
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| What is the purpose of a chelator | show 🗑
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| show | aids in dissolution of organic debris, provides some antibacterial activity
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| show | 5.25% sodium hypochlorite NaClO3
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| show | To enhance the apical hermetic seal
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| show | zinc oxide powder + eugenol
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| show | draw up a thread of paste from the mixing slab, should be able to get 1-2 cm from slab
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| show | extrusion may cause mild irritation to periapical tissues
ZOE can be resorbed over time (not a big pbm for dogs due to shorter lifespan)
Composites cannot be used directly over eugenol b/c interferes w/setting time
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| show | ZOE may eventually disintegrate, can be cytotoxic, and can be antigenic to living tissues
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| How are therapeutic sealer cements classified and what do they contain? | show 🗑
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| What are the requirements for an ideal root canal filling material? | show 🗑
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| show | Type I: standard, sizes approximate files
Type II: accessory/auxilliary. More tapered
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| show | Chloroform (carcinogenic)
Oil of Eucalyptus
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| show | should chemically bind to dentin & enamel
should not break, fatigue, or distort after placement
should have the same coefficient of expansion as teeth
should have high impact strength
should wear at the same rate as teeth
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| What are disadvantages of acrylics as restoratives? | show 🗑
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| What are acrylics useful for in dentistry? | show 🗑
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| show | Bisphenol A-glycidyl methacrylate resin (Bis-GMA) which has a high molecular weight
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| show | to coat or line the area to be filled and to help decrease microleakage
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| show | Creates microporosities that unfilled resin or bonding agent can flow into to enhance bonding strength and increase retention and resistance to microleakage at the margin
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| What is the purpose of added fillers in composites? | show 🗑
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| What other qualities to fillers contribute to composite materials? | show 🗑
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| show | Size of filler particles
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| What are the advantages of a microfill composite? | show 🗑
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| What are the categories of composites according to filler content? | show 🗑
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| What happens to strength and polymerization shrinkage of material as filler particle size increases? | show 🗑
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| show | bigger particles=decreased polishability
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| show | operator control of polymerization
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| show | Non-occlusal areas (class V, Modified Black Classification)
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| show | chemically: ions form salts that bond to the calcium in the tooth
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| show | finely grained, used for luting and cementation of of crowns/bridges
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| What are characteristics of type II Glass ionomer? what are they used for? | show 🗑
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| What are characteristics of type III Glass ionomer? what are they used for? | show 🗑
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| show | contain metal admixtures: silver, amalgam, gold, titanium
sometimes used for cores/build-ups but they're weaker than composites
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| How is amalgam advantageous compared to glass ionomers? | show 🗑
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| What is the composition of amalgam? | show 🗑
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| What are typical components of amalgam? | show 🗑
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| show | zinc. it reacts with moisture in periapical tissues and forms bubbles of hydrogen gas
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| What is the problem with undermixing amalgam | show 🗑
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| show | causes the alloy to set up too quickly
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| How is amalgam retained as a restoration? | show 🗑
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| What eliminates microleakage at the margins of an amalgam restoration? | show 🗑
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| show | composites
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| With what restoration material are cavity varnishes indicated? why? | show 🗑
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| What type of material is used to apply orthodontic brackets, appliances, crowns, or other prosthodontic devices? | show 🗑
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| show | irritate odontoblasts. protects the pulp
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| show | When there is </= 0.5 mm dentin covering the pulp
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| show | Greater tensile & compressive strength
bonds to dentin
releases flouride: cariostatic
can be acid etched to bond to composite
Type II or type I (which has lower viscosity)
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| show | Zinc phosphate
polycarboxylate
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| What is a disadvantage of Zinc phosphate cement in vital teeth? | show 🗑
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| show | weak bonding to gold and porcelains
good adhesive bond to enamel, dentin, stainless steel
Less acidic, possb. less irritating to vital pulp tissue
short working time
thick consistency
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| What determines the success of function and fit of orthodontic and prosthodontic appliances? | show 🗑
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| What are desirable qualities of impression material? | show 🗑
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| show | Impression plaster
Impression compound (THERMAPLASTIC)
Impression ZOE
Impression waxes
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| What are non-elastic impression materials generally used for? | show 🗑
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| show | Hydrocolloids
synthetic elastomers
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| show | Alginate (irreversible hydrocolloid)
Agar (reversible hydrocolloid)
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| What are 3 types of synthetic elastomers? | show 🗑
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| show | Type I: fast setting (1-2 minutes)
Type II: regular-setting (2-4.5 minutes)
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| What does using cool water do to the set time of alginate | show 🗑
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| show | Better tear resistance and dimensional stability
BUT more $$$
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| show | good accuracy and tear resistance
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| What are disadvantages of polysulfide rubber impression materials? | show 🗑
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| show | Light body
Medium or regular body
Heavy body
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| When using vinyl polysiloxane, should one wear gloves? | show 🗑
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| What is the main disadvantage of vinyl polysiloxane? | show 🗑
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| show | chalky, porous white mineral: calcium sulfate dihydrate
Plaster of Paris
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| What is the dental powder product that is used to make models? | show 🗑
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| show | The shape of the calcium sulfate crystals
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| What is the shape of crystals in plaster? how does it affect properties of the material? | show 🗑
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| What is the shape of crystals in stone? How does it affect properties of the material? | show 🗑
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| How does increasing speed or time of spatulation change setting time? | show 🗑
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| show | by adding powder to water (premeasured)
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| What are inlay waxes used for? | show 🗑
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| What are 2 kinds of inlay waxes? | show 🗑
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| show | Low flowability b/c of warm temp in mouth
(result is a harder wax)
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| show | Can have higher flowability b/c working at lower temps, softer wax easier to carve
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| show | "Lost wax technique"
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| show | to produce patterns for metallic framework of removable partial dentures, orthodontic frames
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| How are casting waxes different than inlay wax? | show 🗑
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| What is sticky wax used for? | show 🗑
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| show | to hold freshly mixed plaster or stone solution in and on the impression when poured.
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| show | carding wax
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| show | increasing height of impression tray
cover rough edges on orthodontic appliances to protect mucous membranes
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| How is BITE REGISTRATION WAX used? | show 🗑
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| What are 2 topical protective periodontal medicaments? | show 🗑
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| What do protective periodontal medicaments do? | show 🗑
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| What are periodontal packs used for? | show 🗑
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| What is the most common non-epinephrine hemostatic solution? | show 🗑
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| show | Acts as an astringent to produce contraction of the tissues and reduce sulcal secretions and minor hemorrhage
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| What benefits are provided by fluoride? | show 🗑
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| show | Adverse effects on Calcium metabolism
Adverse effects on the GI system
nephrotoxic
possibly genotoxic
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| What are advantages of chlorhexidine solutions? digluconate, gluconate, and possibly acetate) | show 🗑
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| show | bitter taste
can cause skin & mucosal irritation if prolonged contact time or high concentration
can stain oral tissues and appliances brown
irritating to eyes
ototoxic--->deafness if contacts middle ear
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| What are benefits of ZINC ASCORBATE solutions? What veterinary product uses this solution? | show 🗑
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| Stabilized chlorine dioxide is used in which product? | show 🗑
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| What are lactoperoxidase and glucose oxidase? What do they do? | show 🗑
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| How are lactoperoxidase and glucose oxidase used? | show 🗑
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| What happens to the germicidal effect of hydrogen peroxide when it contacts tissues? | show 🗑
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| show | An especially accurate replica of a single tooth used in the manufacture of crowns
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| What is a study model? JVD Summer 2013 | show 🗑
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| What is a cast? JVD summer 2013 | show 🗑
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| show | viscous under normal conditions but become less viscous, allowing better flow when stressed or agitated
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| How long does it take Type I alginates to set? Type II? | show 🗑
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| impression materials make a ______ reproduction of a structure JVD Summer 2013 | show 🗑
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| gypsum or epoxy are used to make a replica, or _____ reproduction of a structure from impressions JVD Summer 2013 | show 🗑
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| show | Impression compound, impression plaster, zinc oxide-eugenol
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| Name 6 elastic impression materials JVD Summer 2013 | show 🗑
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| show | Accuracy, elastic recovery, dimensional stability, flow/flexibility, hydrophilicity/wettability
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| To what level of detail are low viscosity (light body) impression materials required to record? High viscosity (putty)? i.e. accuracy | show 🗑
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| show | elastic
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| show | PVS. they have no by-product in the chemical setting reaction
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| show | syneresis (H20 evap'n) & imbibition (H20 absorp'n)
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| Within what time frame should an alginate impression be poured up? JVD Summer 2013 | show 🗑
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| What is THIXOTROPY (property of impression material)? JVD Summer 2013 | show 🗑
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| show | alginate
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| What are the two classes of hydrocolloid impression materials? JVD Summer 2013 | show 🗑
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| How long should a regular set alginate be spatulated? JVD Summer 2013 | show 🗑
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| What is the difference in hydrophilicity/wettability of alginates compared to VPS? JVD Summer 2013 | show 🗑
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| show | triclosan
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| What is triclosan? JVD fall 2014 | show 🗑
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| What material is used to make 'gut' suture? JVD fall 2014 | show 🗑
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| How is gut suture treated to make it longer lasting? JVD fall 2014 | show 🗑
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| How is gut suture absorbed? JVD fall 2014 | show 🗑
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| show | Polydioxanone (PDS) 182 days
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| How does zinc polycarboxylate chemically bond to dental tissue? | show 🗑
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| What is the advantage of zinc polycraboxylate cement over zinc phosphate cement? | show 🗑
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