Amalgam vs composites

Comparing the two most commonly used Dental Restorative Materials.

1. AMALGAM Vs COMPOSITES By Dr. RASHID HASSAN BDS(de’ Mont) MSc (QMUL.UK) Hod Science of Dental Materials

2. Objective: Compare the two most commonly used restorative materials Head to head. Will be discussing the two giants of operative dentistry under same heading to have a thorough understanding & comparison. AMALGAM VS COMPOSITES

3. AMALGAM VS COMPOSITES 1: Definition AMALGAM COMPOSITES Amalgam is metallic restorative material which is a mixture of silver alloy and mercury. Highly crosslinked polymeiric material formed by 2 distinct phases bonded to each other by coupling agent. The 2 distinct phases are 1: Continuous phase. 2: Dispersed phase

4. AMALGAM VS COMPOSITES 2: Composition AMALGAM COMPOSITES Powder liquid formulation. Powder: Silver Alloy containing 1: Silver. 2: Tin. 3: Copper. 4: Zinc. 5: Platinum. 6: Palladium. Each component has specific function in final properties of the material. Visous paste like formulation. 4 major components. 1: Organic component. 2: Inorganic component. 3: Coupling agent. 4: Initiator activator system. Minor Additions 1: Color modifiers. 2: Inhibitors.

5. AMALGAM VS COMPOSITES 3: Classification AMALGAM COMPOSITES 1: Based on copper content Low copper alloys.(Copper<6%) High copper alloys (Copper>6-30%) 2) Based on Zinc content Zinc containing (Zinc>0.01%) Zinc free alloys (Zinc<0.01%) 3) Based on shape of alloy particles: Lathe cut. Spherical. Admixed. 1)Based on curing mechanism Light cured composites. Chemically cured composites. Dual cured composites. 2) Based on size of filler particles Conventional. Small particle filled. Microfilled . Hybrid.

6. AMALGAM VS COMPOSITES 4: Availability AMALGAM COMPOSITES Powder liquid bottles. Capsule forms. Sachet form. Syringe form. Paste paste formulation.

7. AMALGAM VS COMPOSITES 5: Indications AMALGAM COMPOSITES Moderate to large class I & II posterior restorations. Class V when aesthetics is not a concern. Core build up material. Apicectomy . Moderate caries control. Class I,II,III,IV,V,VI restorations. Aesthetics dentistry. Partial/full vaneers . Teeth splinting.

8. AMALGAM VS COMPOSITES 6: Contraindications AMALGAM COMPOSITES Where aesthetics is a concern. Extensive loss of tooth structure. Small class I & II cavities. Abnormal occlusal stresses. Poor oral hygiene. Access or isolation difficulties. Allergic patients.

9. AMALGAM VS COMPOSITES 7: Advantages AMALGAM COMPOSITES Ease of use. High compressive strength. Excellent wear resistance. Long term clinical performance. Self sealing ability. Economical. Aesthetics. Conservation of tooth structure. Repairable. Bonding to tooth structure. Same appointment polishing.

10. AMALGAM VS COMPOSITES 8: Disadvantages AMALGAM COMPOSITES Non aesthetic restorative material. Conductor. Less conservation of tooth. Tarnish & corrosion. Galvanic shock. Polymerization shrinkage. Time consuming. Expansive. Increased coefficient of thermal expansion. Difficult to finish & polish.

11. 9: Aestheitics

12. 10: Bonding

13. 11: MARGINAL sEAL

14. 12: Hardness KHN Micro flii = 30 Hybrid= 90 Amalgam=100

15. 13: Compressive Strength ( MPa ) Micro flii = 60 Hybrid= 300 Amalgam=360

16. 14: Tensile Strength ( MPa ) Micro flii = 40 Hybrid= 5 Amalgam=60

17. 15: Elastic Modulus ( G Pa ) Micro flii = 6 Hybrid= 14 Amalgam=30

18. 16: Longivity Composites=7-10 years Amalgam=20+ years

19. CONCLUSION