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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what are the 2 components of ZOE | show 🗑
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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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show | Biologically active (incorportate calcium hydroxide)
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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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What is the common organic polymer matrix component of composite restorative materials? | show 🗑
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show | to coat or line the area to be filled and to help decrease microleakage
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What is the purpose of acid etching enamel? | show 🗑
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show | Increase hardness, strength, resistance to temperature, ability to withstand wear, and control of shrinkage during polymerization
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show | Lower water absorption
greater wear resistance
alter polishability
alter color
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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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What happens to polishability as filler particle size increases? | show 🗑
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show | operator control of polymerization
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Where on the teeth are glass ionomers most useful? | show 🗑
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show | chemically: ions form salts that bond to the calcium in the tooth
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What are characteristics of type I Glass ionomer? what are they used for? | show 🗑
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show | coarser than type I, esthetic restorations
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show | base and liner materials: it can be acid etched and a composite an then be bonded to it for a sandwich effect (i.e. to separate composite from ZOE)
Used as restorative in tx of feline dental dz
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What are characteristics of type IV Glass ionomer? what are they used for? | show 🗑
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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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show | silver, tin, copper, zinc
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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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What is the problem with over mixing amalgam | show 🗑
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How is amalgam retained as a restoration? | show 🗑
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show | corrosional products i.e. tin and silver sulfides
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With what restoration material are cavity varnishes CONTRA-indicated? | show 🗑
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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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How do calcium hydroxide liners induce repairative dentin bridge formation? What is the purpose of this? | show 🗑
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When is it indicated to use CaOH liner? | show 🗑
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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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show | Phosphoric acid component can penetrate through dentinal tubules to irritate or kill the pulp
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What are disadvantages of polycarboxylate cements? advantages? | show 🗑
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show | Accuracy of the model in replicating the oral tissues, which depends on the accuracy of the impressionn/placement
plasticity when placed
flowability to enter/record fine details
reasonable working/setting times
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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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show | Edentulous areas
Impression waxes used for bite registration
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show | Hydrocolloids
synthetic elastomers
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show | Alginate (irreversible hydrocolloid)
Agar (reversible hydrocolloid)
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show | Polysulfides
polyethers
silicones (silicone rubber, polysiloxane)
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show | Type I: fast setting (1-2 minutes)
Type II: regular-setting (2-4.5 minutes)
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show | prolongs it
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What are advantages of synthetic elastomer compared to hydrocolloids? Disadvantages? | show 🗑
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What are advantages of polysulfide rubber impression materials? | show 🗑
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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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show | cost
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What is Gypsum? Give an example | show 🗑
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show | calcium sulfate hemihydrate (when mixed with water,reacts to form CaSO4 dihydrate and heat)
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show | The shape of the calcium sulfate crystals
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show | irregular crystals are weak and require more water to return to the dihydrate form
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show | WELL FORMED, DENSE CRYSTALS REQUIRE LES WATER TO FORM DIHYDRATE CRYSTALS RESULTING IN DENSER AND HEAVIER MATERIAL WITH GREATER COMPRESSIVE STRENGTH AND RESISTANCE TO ABRASION
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show | Increased spatulation decreases setting time by fracturing crystals to form more nuclei for increased spread of the setting rxn
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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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show | Type I: direct
Type II: indirect
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What are necessary characteristics of Direct inlay waxes? | show 🗑
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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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What are casting waxes used for? | show 🗑
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show | More tacky (maint. position on model)
greater ductility for pliability (bend w/o breaking)
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show | to temporarily stick or fix various dental appliances to stone or plaster dental models
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What is BOXING WAX used for? | show 🗑
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What is another name for BOXING WAX? | show 🗑
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What is UTILITY WAX used for? | show 🗑
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How is BITE REGISTRATION WAX used? | show 🗑
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show | Orabase
Tincture of Myrrh & Benzoin
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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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show | has asdverse effects on some of the types of bacteria that are found in caries and periodontal lesions
can inhibit plaque formation
can reduce dental sensitivity
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What are problems associated with excess fluoride? | show 🗑
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show | inhibit development of plaque/calculus
inhibit onset of gingivitis
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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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show | Oxyfresh, reduces oral malodor
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What are lactoperoxidase and glucose oxidase? What do they do? | show 🗑
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show | added to dentrifice to improve performance with less mechanical action
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show | it is diminished b/c hydrogen peroxide rapidly deteriorates in the presence of organic matter
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What is a die? JVD Summer 2013 | show 🗑
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show | positive reproduction--replica--used to evaluate disease and plan tx (orthodontics)
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show | positive reproduction--replica of oral tissues used to manufacture orthodontic appliances or fabricate crowns
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What is the property of thixotropy? JVD Summer 2013 | show 🗑
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show | Type I = fast set (1--2 min)
Type II = regular set (2-4 min)
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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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Name 3 inelastic impression materials JVD Summer 2013 | show 🗑
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Name 6 elastic impression materials JVD Summer 2013 | show 🗑
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What are 5 important qualities of impression materials? JVD Summer 2013 | show 🗑
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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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show | < 1 hour
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What is THIXOTROPY (property of impression material)? JVD Summer 2013 | show 🗑
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Which is the most flexible impression material? JVD Summer 2013 | show 🗑
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What are the two classes of hydrocolloid impression materials? JVD Summer 2013 | show 🗑
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show | 45 sec
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What is the difference in hydrophilicity/wettability of alginates compared to VPS? JVD Summer 2013 | show 🗑
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monocryl and vicryl are available now with a coat of ___ to create a zone of inhibition around the suture line JVD fall 2014 | show 🗑
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show | broad-spectrum antibmicrobial agent (even effective against methicillin resistant bacteria)
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show | cow intestinal serosa, sheep intestinal submucosa
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show | coated with chromium salts & glycerol
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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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show | carboxyl group appears to bond to Ca2+ ion at the surface of the tooth enamel or dentine
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What is the advantage of zinc polycraboxylate cement over zinc phosphate cement? | show 🗑
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