Revision on Practical Dental Materials RDM211 DENTAL BIOMATERIALS.

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Revision on Practical Dental Materials RDM211 DENTAL BIOMATERIALS

Transcript of Revision on Practical Dental Materials RDM211 DENTAL BIOMATERIALS.

Page 1: Revision on Practical Dental Materials RDM211 DENTAL BIOMATERIALS.

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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