revision on practical dental materials rdm211 dental biomaterials
TRANSCRIPT
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Revision on Practical Dental Materials
RDM211
DENTAL BIOMATERIALS
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Mechanical properties
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DIAMETRAL TENSILE STRENGTH TEST
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THREE POINT BENDING (TRANSVERSE STRENGTH TEST
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Testing compressive strength of a material:
• Specimen shape: Cylindrical
• Type of force used: compression
•Tester: Universal Testing Machine
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Dumbell shaped specimen
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Disc shaped specimen for diametral TS
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Diametral compression test of brittle materials:
• Specimen shape: Disk-shaped
• Type of force applied: Compression
• Resultant force: Tension
• Tester: Universal Testing Machine
Stress = 2P Load π D T
Diameter XThickness
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Hardness testers
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STOCK TRAYS
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Acrylic special tray
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1-IMPRESSION MATERIALS
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Impression compound low fusing sheets and sticks(green)
compound(
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• 1) An impression compound disc
• 2) An impression compound impression taken in an upper edentulous stock tray
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LOW FUSING COMPOUND (GREEN COMPOUND).
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ZINC OXIDE EUGENOLIMPRESSION PASTE
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Glass slab and spatula
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ZINC OXIDE EUGENOL SECONDRY IMPRESSION
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ACRYLIC SPECIAL TRAY WITH BORDER MOULDED (USING LOW FUSING
COMPOUND) READY FOR MAKING ZOE IMPRESSION
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PRIMARY COMPOUND IMPRESSION
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INPRESSION COMPOUND SHEETS
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Agar syringe and tray material
• Syringes:Syringes: low viscosity – high flow. low viscosity – high flow.
• Tubes:Tubes: high viscosity – heavy body: low flow. high viscosity – heavy body: low flow.
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AGAR-AGAR CONDITIONER
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Three compartments conditioning bath
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Water cooling system tray for agar impression
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Alginate
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Rubber bowl and broad bladed spatula
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Alginate impression
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polysulphide
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•Mixing on paper pad or glass slab with medium blade spatula.
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Manipulation
•Kneading
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Addition siliconeHow many consistency
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Vinyl glovesLatex gloves
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Condensation silicone
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• Condensation silicon– By-product
– ethyl alcoholInaccuracy (shrinkage)Poured as soon as
possibleNeed very dry field
(hydrophobic) Advantages:
Clean, pleasant odour
Addition silicon:No byproduct
Release H2 gas after settingDelayed pouring
Hydrophobic
Advantages:Good dimensional stability
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Tray adhesive
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Auto mixing gun and cartridges
Static mixing tips
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Rubber base impression
Light body
Heavybody
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2 -GYPSUM MATERIALS
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STONE CAST
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Die
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Rubber bowl and spatula
Semi mechanical mixer
Vacum mixing machine
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