Artificial Teeth

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1. ARTIFICIAL TEETH PRESENTED BY : Dr. TABISH ZIA KHATTAK

2. INDRODUCTION Constitute one of the main components of Denture. Commonly used materials Acrylic Porcelain

3. IDEAL REQUIREMENTS Esthetics Should ideally match the Natural teeth in shape , color & translucency. Good attachment to denture base Low density Light weight dentures. Strong and Tough To resist fracture. Resist aberration during Chewing & Cleaning. Allow easy Chair-side adjustments to adjust occlusion. Resist Staining

4. COMPOSITION ACRYLIC TEETH PORCELAIN TEETH POWDER 1 ) Clay (Kaolin) Polymer , PMMA 2 ) Silica Initiator, Benzoyl peroxide 3) Binder (Feldspar) Pigments 4) Glasses LIQUID Monomer, MMA Cross-linking agent, Ethylene-glycol- dimethacraylate . Inhibitor, Hydroquinone. Activator, N N′-dimethyl-p-toluidine

5. FABRICATION ACRYLIC TEETH PORCELAIN TEETH Reusable metal moulds using Fabrication involves a) Dough Moulding Technique. a) Compaction b) Injection Molding Technique. b) Firing Standard shapes & sizes produced by using molds 30% larger than required to allow shrinkage during firing. Highly cross-linked resins Small holes or metal pins are used to resist crazing incorporated in the base of Porcelain teeth during their production Mechanical attachment.

6. ADVANTAGES OF ACRYLIC TEETH Easy to adjust and trim Chemical bonding to denture base, as they are made of the same material Acrylic teeth are more compatible with the denture base than porcelain teeth. No clicking sound

7. ADVANTAGES OF ACRYLIC TEETH 5) Easy to fabricate 6) Less trauma to denture-bearing area. This is particularly crucial for people with implants supporting the fake tooth. If they have lost bone or gum tissues around the implant, acrylic teeth are more forgiving when you grind your teeth, and will hold their position longer than porcelain teeth. 7) Dentures made with acrylic teeth are lighter

8. DISADVANTAGES OF ACRYLIC TEETH 1) Acrylic teeth are susceptible to abrasion, e.g. if the patient has a habit of teeth-grinding (bruxism) or eats rough diets, the teeth will wear down with time, causing changes in the length of the teeth. 2) Easily stained, as they contain microscopic pits that can hold bacteria 3) In rebasing, difficult to remove acrylic teeth from the denture base

9. ADVANTAGES OF PORCELAIN TEETH 1) Although both acrylic and porcelain teeth can be made to give a natural appearance, the slightly greater translucency and depth of color achieved with porcelain, gives this material a slight advantage . 2) Harder than acrylic more durable. 3) Resist wear- this preserves the normal jaw movements and alignment for a longer period. 4) Resist staining

10. ADVANTAGES OF PORCELAIN TEETH 5) Occasionally, due to resorption of the edentulous ridges, the denture becomes loose and does not fit the mouth at all. Instead of remaking a new denture, the base of the denture can be replaced (called “rebasing”) while retaining the artificial teeth so that the Occlusion will not be altered. Because porcelain teeth do not bond chemically to the base, they are easily removed from the base for this purpose.

11. DISADVANTAGES OF PORCELAIN TEETH 1) Noisy: clicking sounds are made when porcelain teeth comes into occlusion with another porcelain tooth 2) Brittle – more likely to fracture than acrylic teeth 3) Do not bond chemically to denture base –Small holes or metal pins are incorporated in the base of porcelain teeth during their production to enable mechanical bonding to the denture base.

12. DISADVANTAGES OF PORCELAIN TEETH 4 ) Not as compatible as acrylic teeth with the base of the denture – There is a serious mismatch in coefficient of thermal and modulus of elasticity between porcelain and acrylic resin. This may lead to crazing and cracking of the denture base in the region around the base of the porcelain teeth. 5) Its density value is about twice that of acrylic teeth; dentures constructed with porcelain teeth are much heavier . 6) Difficult to fabricate.

13. DISADVANTAGES OF PORCELAIN TEETH 7) Difficult to trim, due to the hardness of this material. 8) Porcelain teeth exert more force to the underlying supporting soft tissues, causing more trauma to these tissues . This is a function of the greater modulus of elasticity of porcelain. This trauma is capable of accelerating the rate by which the underlying bone resorbs .

14. DIFFERENCE BETWEEN ACRYLIC & PORCELAIN TEETH PROPERTIES ACRYLIC TEETH PORCELAIN TEETH 1). Aesthetics A more realistic Customized appearance can be achieved. Good but not long-lasting. Easily stained/discolored. A more realistic Customized appearance can be achieved. Better & long-lasting. Greater translucency. Depth of color. 2). Clicking sound Absent Present 3). Attachment Mechanism Chemical adhesion to DB. More Compatible with DB material. Mechanical retention to DB. Less Compatible with DB.

15. DIFFERENCE BETWEEN ACRYLIC & PORCELAIN TEETH PROPERTIES ACRYLIC TEETH PORCELAIN TEETH 7). Hardness/Wear Less hard , suffer abrasion. Wear out with time Much harder, no abrasion. Much durable. Teeth easily removed for re-basing if required . 8). Adjustability Easily adjusted by grinding. Easily polished following adjustment. Difficult to adjust On grinding glaze is lost. Difficult to polish 9). Cost Cheap Costly

16. IMPORTANT TIPS

17. CLEANING OF DENTURES