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Dental Materials 4

Ortho Debonding to prophy jet

QuestionAnswer
what is debonding? complete removal of composite material from enamel surfaces after orthodontic treatment
what are the objectives to debonding? to return enamel surface to its pre treatment or natural appearance to return the enamel surfaces to its pre treatment texture
what are the problems with debonding? enamel loss, gouges in enamel, scratches, tissue irritants, time consuming
what is the one instrument you can use for debonding? tungsten carbide burr with a slow speed hand piece
what type of cement is on the bands of ortho? zinc polycarboxylate cement on bands can use cavitron tip on the cement that is placed on the metal band that is placed on the molars
what type of cement is on the brackets on premolars and anterior during ortho? resin
what is the debunking procedure? bracket and band removal, identification of composite resin adhesive, removal of resin bulk, final finish and polishing, evaluation of criteria
how do you identify composite resin adhesive on patient's teeth? patient report, stain on tooth (disclosing solution), drying tooth, exploring the tooth
how do you remove resin bulk? use a scaler one time, slow speed hand piece and tapered tungsten carbide finishing bur, brush stroke in one direction
what is the procedure for final finishing and polishing? aluminum oxide points aluminum oxide cups polish with tin oxide and rubber cup polish with brown polishing cup final polish with green polishing cup
how many patients have white spot lesions during ortho? 30-50%
if patient have generalized significant white spot lesions... the enamel is too soft to debond so put florid varnish or ACP paste on their teeth and let patient use that for 3 months
what would be a low risk for white spot lesion? no previous WSL, good oral hygiene, low dietary sugar exposure, short treatment time, controlled etching, lingual appliances
what would be a high risk for white spot lesions? existing WSL, poor oral hygiene, high dietary sugar exposure, long treatment time, excessive etching, labial appliances
are acrylic resins thermoplastic or thermoset in dentistry? thermoset
what is a co-polymer? two or more different types of monomers join together
what is a homo-polymer? same type of monomers join to form the chain
what is the chemical reaction which occurs to form a polymer from any monomer? polymerization
what does MMA stand for? Methyl methacrylate
what does PMMA stand for? polymethyl methacrylate
what happens when spatial structures are heated? physics bonds break and the chains can slide past one another resulting in a soft material
what happens when spatial structures are cooled? bonds reform and the material hardens
what is addition polymerization? monomer molecules are added one to another sequentially as reactive group on one molecule initiates bonding with adjacent monomer molecule and it frees a free radical to repeat the process
when the side chains of adjacent polymers are joined by weak bonds... polymers are easily manipulated
when the adjacent polymers are joined by highly charged side chains... bond is stronger and the cross linked polymers are stronger and stiffer
when you increase the number of monomers to form the polymer (DP) what do you increase? strength, stiffness, stability and compatibility
what are important composition in the powder for cold cure or chemically cured acrylic? cross linking agent glycol dimethacrylate inhibitor hydroquinone
what is used to minimize porosity in acrylic resins? temperature and pressure
what happens if monomers evaporate during handling process? the acrylic becomes porus
what does glycol dimethacrylate do to MMA in cold cure acrylic resins? increases toughness and decreases birttleness
what does hydroquinone do to MMA in cold cure acrylic resins? destroys free radicals and creates working time
what is the physical change during polymerization? sandy, stringy, doughy, rubbery, set doughy stage working time rubbery stage you can trim
what is different in the heat cured acrylic resins that is not present in the cold cure? no chemical activator present in the liquid less inhibitor (hydroquinone) in the liquid
what is in the liquid of cold or chemically cure resins? methyl methacrylate, hydroquinone, ethylene glycol, teritary amine
what is in the powder of cold or chemically cured resins? acrylic resin powder benzoyl peroxide fibers and colorants
what is in the liquid of heat cured resins? methyl methacrylate, hydroquinone, ethylene glycol
what is in the powder of heat cured resins? acrylic resin powder, benzoyl peroxide, fibers and colorants
how do we pour acrylic resins? liquid into powder
which acrylic resin is better for accuracy and dimensional change? cold cure
which acrylic resin is better for completeness for cure? heat cured, heat bath allows for it to cure
what are stock trays used for? preliminary impressions to create study models, diagnostic casts NOT detail oriented
what are custom trays used for? used to take final impression for full or partial dentures, inlays/onlays/crowns, bridges, porcelain veneers
how do light cured impression trays work? sheet of preformed material is adapted over the cast, trimmed and then put under the light curing unit doesn't generate heat during polymerization
how are chemically cured impression trays done? involved with mixing powder of pre polymerized beads with liquid monomer releases heat during curing process
how are chemically activated acrylics different that heat cured? monomer component contains a chemical activator (amine no heat)
where do you place the stops on the custom tray? 5 mm square on the buccal cusp of first premolar and mesiobuccal cusp of second molar on unprepared teeth
when did the NCAA mandate the use of mouth guards for football players? 1973
what is a mouthgaurd? a resilient device or appliance placed inside the mouth (or outside) to reduce mouth injuries, particularly to the teeth and surrounding tissue
what are the functions of a mouth guard? protect soft tissue, teeth, supporting structure and mandible from fracture and prevent tempormandibular joint injury
what are considerations when picking a mouth guard? occlusion, dental anatomy, orthodontic status, sport, level of play and equipment
what is a stock mouth guard? not fitted to teeth of alveolus, teeth must be clenched to keep in, hampers speech and breathing, generally not easily comfortably worn
what is mouth formed mouth guard? cost effective but difficult to achieve a good fit, difficult to speak and breathe and adapt orthodontic appliances
what is vacuum formed custom mouth guard? sheet of ethylene vinyl acetate pulled with vacuum over a cast of theme's teeth
what is heat pressure laminate custom mouth guard? special machine to push EVA onto the cast, enhances the ability to laminate multiple laters of material
what is value? represents the brightness of a color independent of its hue
what is chroma? intensity or saturation of a color
what is hue? the actual color like red, yellow, green or blue
what are rods and how many are there in the human eye? 120 million light receptors respond to light and dark only
what are cones and how many are there in the human eye? 6 million color receptors located in the fovea
when do we want to select a shade for a tooth? before anesthesia, two weeks after bleaching treatment, before preparation of a tooth
what is the proper distance to select a shade from? 6-8 inches
what is the proper lighting to select a shade in? 5500 degrees Kelvin
what is the proper time to look at a shade selection? 3-5 seconds, rods are exhausted after this so you need to let them rest and look at gray or blue
what are the causes of pulp vitality loss? dental caries, periodontal disease, trauma, cavity prep too close to the pulp, rapid orthodontic movement, age and wear
what will you see extra orally if a patient has a pulpal problem? swelling or tenderness, look at the patient's lymph nodes
what will you see intramurally if a patient has a pulpal problem? tooth discoloration, fractured tooth (cracks), dental caries of large size that do not hurt, swelling at the apex of the tooth
what might you see on the radiographs if a patient has pulpal problem? periapical radiolucency, widening periodontal ligament space, dental caries, fractured tooth
what is the rule of thumb when looking at radiographs to determine pulpal health? radiographs alone will not determine pulpal health expose at least 2 films at two different angles
where do you place electric pulp tester on single rooted tooth? middle 1/3 of crown
where do you place electric pulp tester on multi rooted tooth? middle 1/3 of the crown over each root
what are the contraindications for electric pulp tester? patient with cardiac pace makers teeth with crowns or large restorations
what does the electric pulp tester advantages and disadvantages? suggests that the pulp may or may not be vital doesn't give the clinician information of vascular health technique sensitive (28% reliable)
what is a false positive? pulp tester says the tooth is vital tooth is not vital
what is a false negative? pulp tester says it is not vital it actually is vital
what can cause a false positive? moisture on tooth, contact with gingiva or larger restoration, patient anxiety, fluid or exudate within the pulp
what can cause a false negative? multi-rooted, poor contact, defective pulp detector, heavily medicated patient, excessive calcification, recently traumatized tooth, immature root formation
if the pain lasts less than 30 seconds when doing a pulp test what could it be? dentinal hypersensitivity or reversible pulpitis
where should you tap during percussion test? first tap on occlusal or insical surface then tap on the buccal or lingual aspects of the teeth
what tooth usually is cracked during cracked tooth syndrome? mandibular 1st molar
what are the two classifications of non aqueous elastomers? condensation: by product is released addition reaction: by product is not released
what is light body polyvinyl siloxanes? syringe material, reproduces fine detail, exhibits less resistance to flow and takes longer to set
what is heavy body polyvinyl siloxanes? provides less detail but exhibits excellent dimensional stability
how long should you wait to paint tray adhesive before taking the impression? 5 minutes
how long should you wait before pouring up the impression? 15 minutes because hydrogen gas is emitted during polymerization and cast may become pitted
what is the Moh's hardness of sodium bicarbonate? 2.5
what is the um of sodium bicarbonate? 74-250 um
what is the um of aluminum trihydroxide? 80-325 um
what is the mohs hardness of aluminum trihydroxide? 2.5-3.5
what is the um of amino acid glycine salt 2 um to 20 um
what is the mohs hardness of amino acid glycine salt 2.0
what is the um of novamin calcium sodium phosphosilicate? 25-120 um
what is the mohs hardness of novamin 6.0
what is the air pressure? 50-60 psi
what is the water pressure? 10-50 psi warmed to 95 degrees
anterior teeth angulation of prophy jet 60 degree angle
posterior teeth angulation of prophy jet 80 degree angle
occlusal surface angulation of prophy jet 90 degree angle
Created by: Chobchi