Download - General dentistry &
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General Dentistry &Artificial TeethASST PROFESSORDr Mumtaz ul IslamB.Sc. BDS. MHR. M.Phil.
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General Dentistry
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Impression and Model
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Model or Cast
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Die
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Posterior Bridge
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Anterior Bridge
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Crown
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Dental Implant
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Cast Partial Denture
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Complete Denture
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GV Blacks Classification
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Artificial Teeth
Dentistry Common perception False teeth Main component of a denture Acrylic and porcelain
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Requirements
Appearance Attachment & compatibility Low density Strength Hard enough for masticatory forces Allow grinding with burs for adjustment
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Acryilc Teeth Production
Produced in moulds (metal, reuseable) Dough moulding technique Injection moulding Highly cross linked resin Resistant to crazing Tooth coloured pigments no pink colour
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Porcelain TeethManufacturing
According to required shapes and sizes Moulds kept 30% larger than required Disposable moulds Mechanical attachments Metallic pins or holes
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Properties
Aesthetic Density 1.2 & 2.4 Coefficient of thermal expansion (acrylic 80 porcelain 7) Modulus of elasticity (GPa) 2.5 & 80 Hardness (VHN) 20 & 500 Occurrence of radioactive compounds (uranium-238)
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Properties
Contd.
Wear in acrylic teeth especially in dusty or gritty environment Acceptable appearance Convenient handling Greater toughness compatibility Surface stains incorporation
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Disadvantages
Bonding, cracking or crazing of denture base Fracture and chipping of porcelain teeth Difficult to grind for adjustments Porcelain teeth transmits excessive force Contraindicated for resorbed ridges and diminished interocclusal
distance Surface stains are less stable in acrylic teeth
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