Amalgam &composite
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The document compares dental amalgam and composite materials, detailing their compositions, classifications, indications, advantages, and disadvantages. Dental amalgam is a metal-based material primarily used for posterior restorations, while dental composites are polymer-based and favored for esthetic applications. Both materials have specific manipulation techniques and cavity preparation requirements, with increasing preference for composite fillings despite some limitations.
Amalgam &composite
- 1. DENTAL AMALGM & COMPOSIT. ABCD’S&G.
- 2. DENTAL AMALGM & COMPOSITE DENTAL AMALGAM : Dental amalgam is a metal like restorative material composed of a mixture of silver/tin/copper alloy and mercury. DENTAL COMPOSITE : They are highly cross linked polymeric materials reinforced by a dispersion of glass,crystalline or resin filler particles or short fibers bound to the matrix by silane coupling agents.
- 3. COMPOSITION OF AMALGM & COMPOSITE Dental Amalgam: Alloy of mercury, silver, tin, and copper, it may also contain palladium, zinc , gold to improve the handling characteristics Dental Composite: 1-Resin matrix 2-Filler particles 3-Coupling agent . 4-Activator-initiator system required to convert resin to soft moldable filling material to hard durable restoration.
- 4. CALSSIFACTION OF AMALGM & COMPOSITE Based on copper content : 1-Low copper alloy -- < 6% copper (conventional alloy) . 2- High copper -- 6-30% copper (1) admixed alloy (2) single composition alloy Based on zinc content : (1) zinc containing alloy -- > 0.01% zinc (2) zinc free alloy -- < 0.01 zinc. Based on shape of alloy particles : (1) lathe cut alloy. (2) spherical alloy (3) admixed alloy. Based on size of alloy particles (1) micro cut (2) fine-cut (3) coarse-cut. Based on presence of noble metals : (1) noble metal alloys (palladium, platinum, gold) (2) non-noble metal alloys
- 5. COMPOSITION OF AMALGM & COMPOSITE Dental Composite: • Based on curing mechanism: • 1-Chemically activated • 2-Light activated • Based on size of filler particles: • 1-Conventional 8-12 um • 2-Small particle 1-5 um • 3-Microfilled 0.04-0.4 um • 4-Hybrid 0.6-1.0 um.
- 6. INDICATIONS OF AMALGM & COMPOSITE Dental Amalgam: • Restoration of posterior teeth(ClassI&II) (Moderate to large preparations). • Class V preparations (when esthetics is not the prime concern). • Core build up for badly broken down teeth in the posterior teeth. • Sometimes in distal surface of canines. • For moderate caries control.
- 7. INDICATIONS OF AMALGM & COMPOSITE Dental Composite: • Class I,II,III,IV,V,VI restorations. • Foundation or core buildup. • Esthetic enhancement procedures- • Partial veneers and Full veneers. • Diastema closure. • For periodontal splinting.
- 8. CONTAINDICATIONS OF AMALGM & COMPOSITE Dental Amalgam: Dental Composite: 1.High caries incidence and poor oral hygiene. 2.Teeth with heavy or abnormal Occlusal stress. 3.If access & isolation difficulties. 4.Patient allergic or sensitive to resin composite. 1-Esthetics. 2- Extensive loss of tooth structure 3- Small class I and class II cavities.
- 9. ADVANTAGES OF AMALGM & COMPOSITE Dental Amalgam: Dental Composite: 1-Ease of use. 2- High compressive strength. 3-Excellent wear resistance. 4- long-term clinical results. 5- Economic 6-Can be bonded to tooth structure. 7-Self-sealing ability. 1.Esthetic. 2.Conservation of tooth structure. 3.Insulative. 4.Bonded to tooth structure. 5.Repairable. 6.Can be polished at the same appointment
- 10. DISADVANTAGES OF AMALGM & COMPOSITE Dental Amalgam: Dental Composite: 1-Lack of esthetics 2- Less conservative 3- Non-insulating 4- Corrosion and galvanism 5- Lack of reinforcement of weakened tooth structure 1.polymerization shrinkage. 2.time consuming and expensive. 3. More technique sensitive. 4. difficult to finish and polish. 5. increased coefficient of thermal expansion
- 11. MANIPULAION OF AMALGM & COMPOSITE MANIPULATION OF AMALGAM 1. Selection of alloy and mercury 2. Mercury alloy ratio (Proportioning) 3. Trituration (Mechanical and hand) 4. Mulling 5. Condensation (Hand and mechanical) 6. Pre-carve burnishing 7. Carving. 8. Post-carve burnishing. 9. Polishing .
- 12. MANIPULAION OF AMALGM & COMPOSITE Manipulation of composite: 1. Selection of the resin composite type and shade. 2. Isolation of the field. 3. Pulp protection. 4. adhesive application. 5. Matricing. 6. Wedging. 7. Packing. 8. Contouring and shaping. 9. Polymerization. 10. Finishing and polishing. 11. Maintenance.
- 13. Cavity preparation of amalgam and Composite.
- 14. CAVITY PREPARTION OF AMALGM & COMPOSITE Cavity preparations for amalgam restorations : 1. 90 degree CSA . 2. The walls must be parallel or perpendicular to occlusal loads. 3. A definite gingival seat of 1.5-2 mm. in depth for compound cavities. 4. Rounded internal line angles. 5. Sufficient bulk at the isthmus area 6. Each portion must have its own independent retention and resistance.
- 15. CAVITY PREPARTION OF AMALGM & COMPOSITE Cavity preparations for Composite restorations : Tooth preparation : 1.Minimal extension. 2.Pulpal and axial walls of varying depth. 3.Enamel bevel. 4.Butt joint on root surface. 5.Tooth preparation walls must be rough.
- 16. CAVITY PREPARTION OF AMALGM & COMPOSITE Cavity preparations for Composite restorations : Cavity design preparation: 1-Conventional 2-Beveled conventional 3-modified 4-Box shape 5-Facial/lingual slot Conventional Beveled conventional Modified (adhesive)
- 18. AMALGM & COMPOSITE Amalgam filling material is still used everyday by most dentists. It is considered safe to use and is very effective in a lot of circumstances. There are problems with amalgam. The main ones are it’s appearance and inability to bond/stick to teeth. White, composite fillings are therefore becoming much more widely used and are the preferred choice for many people.. Composite filling material is a modern ‘white’ choice available as an alternative to the older amalgam ‘silver’ fillings. It has many uses and benefits. However, it has some problems and amalgam is still better in some circumstances
- 19. ABCD’S&G.