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2. 2. >> 0 >> 1 >> 2 >> 3 >> 4 >> Types of resin composites Introduction: What are dental Composites ?. Tooth coloured dental restorations Which can be applied on all teeth and They have great advantages over Ceramics and silver fillings. As they 1) conserve tooth structure. 2) can achieve maximum esthetics.
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5. 5. >> 0 >> 1 >> 2 >> 3 >> 4 >> The aim of our presentation is to enumerate different types of composites, their benefits and clinical uses.
6. 6. >> 0 >> 1 >> 2 >> 3 >> 4 >> Types of resin composites Contents : 1) Composition of composites 2) Classification of composites -Types of recent composites: a) Flowable composites . b) Condensable composites. c) Nano-composites. 4) Conclusion
7. 7. >> 0 >> 1 >> 2 >> 3 >> 4 >> 1) Composition of composites 1) matrix. 2) filler. 3) coupling agents. 5) intiators and accelerators. 4) tooth coloured pigments.
8. 8. >> 0 >> 1 >> 2 >> 3 >> 4 >> 1) Composition of composites Composites are basically modified methacrylates or acrylates with other ingredients to produce different structures and properties.
9. 9. >> 0 >> 1 >> 2 >> 3 >> 4 >> 2) Classification of composites why methacrylate?? because their refractive index is 1.3 which is close to the tooth. they consist of: 1- resin matrix (organic content):it's back bone of composite eg: Bis-GMA or UDMA 2- fillers (inorganic part):as: quartz, ceramic,silicon dioxide and or silica.
10. 10. >> 0 >> 1 >> 2 >> 3 >> 4 >> -why adding fillers ?? to improve the physical and mechanical properties of the organic matrix . With increasing filler content the polymerisation shrinkage, the linear expansion coefficient and water absorption are reduced. On the other hand, with increasing filler content, the compressive and tensile strength, the modulus of elasticity and wear resistance are generally increased .
11. 11. >> 0 >> 1 >> 2 >> 3 >> 4 >> Composition of composites 3- coupling agents : which bond between matrix and filler. 4- activator agents: activate the polymerization of composites. 5- Inhibitors: agents inhibit the free radical generated by spontaneous polymerization of the monomers. 6-coloring agents : which are used in very small percentage to produce different shades of composites.
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13. 13. >> 0 >> 1 >> 2 >> 3 >> 4 >> classification of composites: 1-according to polymerization method : 1) Light cured. 2) Chemical cured. 3) Dual cured
14. 14. >> 0 >> 1 >> 2 >> 3 >> 4 >> 2-according to filler particle size (Philips and Lutz classification) Macrofiller composites (particles from 0.1-100 p.) Microfiller composites (0.04 p particles). Minifiller. Hybrid composites (fillers of different sizes): 1. nano filler (nano hyprid) 2.microhybrid
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16. 16. >> 0 >> 1 >> 2 >> 3 >> 4 >> 3-according to matrix composition: a. Bis-GMA b. UDMA 4. According to Skinner: a. Traditional or conventional composite-8-12 pm b. Small particle filled composites-1-5 pm c. Microfilled composites-0.4-0.9 pm d. Hybrid composites-0.6-1 pm
17. 17. >> 0 >> 1 >> 2 >> 3 >> 4 >> RECENT ADVANCES IN COMPOSITES Flowable Composite Resins. Condensable (Packable) Composites. Giomers. Compomers. ORMOCER (Organically Modified Ceramic). Antibacterial Composites/ Ion Releasing Composites. Smart Composites.
18. 18. >> 0 >> 1 >> 2 >> 3 >> 4 >> studies : The filler content had the greatest influence on the material properties. The further development of nanotechnology and antimicrobial materials has a high potential. The realisation of smart materials would certainly be interesting. These are restorative materials, which are able to react directly to external stimuli (e. g. release of antimicrobial substances in the case of a drop in pH in the vicinity of the restoration). Research is also done in the area of self-repairing materials and in material science for bone and dental hard tissue regeneration .
19. 19. >> 0 >> 1 >> 2 >> 3 >> 4 >> SDR allows the use of a simplified filling technique applied in increments of up to 4mm and capped with a universal composite at the occlusal surface. This is achieved with a reduction in the polymerization stress and a high depth of cure. To achieve this, a modulator has been built into the conventional monomer this also allows SDR to be used with other conventional adhesives and composites.
20. 20. >> 0 >> 1 >> 2 >> 3 >> 4 >> A chewing simulation demonstrated that, with this simplified filling technique; the same marginal quality of a restoration can be achieved compared to a restoration created using an incremental layering technique.
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23. 23. >> 0 >> 1 >> 2 >> 3 >> 4 >> a) Flowable composites These are low-viscosity composite resins, making them more fluid than conventional composite resins. Resin compound that is relatively fluid when placed in a cavity before polymerization .
24. 24. >> 0 >> 1 >> 2 >> 3 >> 4 >> a) Flowable composites Flowable composites flow freely over the inside surface of the cavity preparation. This material has made it possible to fill small cavities on occlusal surfaces (the tops of teeth) without a shot since the area of decay is often small enough to be removed with little or no sensation in the tooth.
25. 25. >> 0 >> 1 >> 2 >> 3 >> 4 >> a) Flowable composite Flowable composites are often used to seal the dentin of a tooth prior to placing the filling material Due to the low level of filler particles. Some brands contain glass particles and release fluoride to the adjacent tooth structure. They are delivered into a cavity using a syringe.
26. 26. >> 0 >> 1 >> 2 >> 3 >> 4 >> a) Flowable composites Advantages : 1) high wettability of the tooth surface ensuring penetration into every irregularity 2) ability to form layers of minimum thickness, so improving or eliminating air inclusion or entrapment.high flexibility, so less likely to be displaced in stress concentration areas. 3) radio-opaqueness and 4) availability in different colours.
27. 27. >> 0 >> 1 >> 2 >> 3 >> 4 >> a) Flowable composites Disadvantages: 1) high curing shrinkage due to lower filler load 2) weaker mechanical properties than other composites .
28. 28. >> 0 >> 1 >> 2 >> 3 >> 4 >> a) Flowable composites Indications: 1- Preventive Resin Restorations (pit And fissure sealants ) . 2- Bonding Orthodontic Bracket 3- Class II and V Restorations. 4- Repairing Small Direct, and Indirect Restorations. 5-Splinting Fractured and Mobile Teeth and Orthodontic Retainers
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30. 30. >> 0 >> 1 >> 2 >> 3 >> 4 >> b)Condensable composite Condensable (packable) composites are resins with a high percentage of filler (silica , quartz and glass).
31. 31. >> 0 >> 1 >> 2 >> 3 >> 4 >> b)Condensable composite Advantages : 1- condensability ( like silver amalgam) so they can replace it . 2- greater ease in achieving a good contact point 3-Better reproduction of occlusal anatomy. 4- They have less polymerization shrinkage with respect to traditional hybrid composites.
32. 32. >> 0 >> 1 >> 2 >> 3 >> 4 >> 5- they have decreased mickroleakage and wear resistance Compared to traditional hybrid composites.
33. 33. >> 0 >> 1 >> 2 >> 3 >> 4 >> b)Condensable composite Disadvantages : 1-difficulties in adaptation between one layer & another . 2-difficult in handling 3-poor esthetics in anterior teeth.
34. 34. >> 0 >> 1 >> 2 >> 3 >> 4 >> b)Condensable composite The main indication :- class II cavity restoration in order to achieve a better contact point thanks to the condensation technique.
35. 35. >> 0 >> 1 >> 2 >> 3 >> 4 >> c) Nano-composites Nanofill composites combine conventional filler technology with nanoparticles to achieve both strength and aesthetics in one material.
36. 36. >> 0 >> 1 >> 2 >> 3 >> 4 >> c) Nano-composites Currently, two distinct types of nanofill composites are in the marketplace: 1) Completely nanofilled resins (contain nanometer-sized particles throughout the resin matrix). 2) Nanohybrids, on the other hand, consist of larger particles surrounded by nanometer- sized particles.
37. 37. >> 0 >> 1 >> 2 >> 3 >> 4 >> c) Nano-composites Although these nanofill materials vary in composition, the goal is the same: creating a universal dental composite.
38. 38. >> 0 >> 1 >> 2 >> 3 >> 4 >> c) Nano- composites nano-hybrids contain nanometer particles combined with more conventional filler technology. These large particles provide similar strength properties to hybrid materials while nano exhibits higher polishability. Unlike microhybrids, nano-fill composites have a lifelike opacious translucency that is very natural in appearance. N.B : Microhybrids will not hold their polish as long as microfill resins, and, as a result, may be more susceptible to plaque and staining over time.
39. 39. >> 0 >> 1 >> 2 >> 3 >> 4 >> c) Nano-composite N.B : Microhybrids will not hold their polish as long as microfill resins, and, as a result, may be more susceptible to plaque and staining over time.
40. 40. >> 0 >> 1 >> 2 >> 3 >> 4 >> c) Nano-composites Advantages : 1) strength. 2) Easy shade selection system 3) Florescence 4) Radiopacity. 5) Translucency. 6)Better handling. 7)Availability in capsules.
41. 41. >> 0 >> 1 >> 2 >> 3 >> 4 >> Nano- composites Main indications : 1) posterior restorations. 2) veneering anteriors. 3) building up incisal edges. 4) The classic class IV restoration. 5) when restoring or increasing cuspid rise.
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43. 43. >> 0 >> 1 >> 2 >> 3 >> 4 >> conclusion
44. 44. >> 0 >> 1 >> 2 >> 3 >> 4 >> Ultimately, the best dental filling is no dental filling. Prevention is the best medicine.
45. 45. >> 0 >> 1 >> 2 >> 3 >> 4 >> References and links http://www.dentistrytoday.com/aesthetics/157-- sp-345438456 http://www.dentaleconomics.com/ http://www.slideshare.net/biancawilda/composit e-resin http://www.ncbi.nlm.nih.gov/pubmed/21477852 http://pocketdentistry.com
46. 46. >> 0 >> 1 >> 2 >> 3 >> 4 >> Refrences and links http://www.mouthhealthy.org/en/az- topics/c/composite-fillings. http://www.jacobsen-dental.no/what-is- smart-dentin-replacement/
47. 47. >> 0 >> 1 >> 2 >> 3 >> 4 >> Presented by : STUDENTS AT FACULTY OF DENTISTRY AHRAM CANADIAN UNIVERSITY PRIVATE EGYPTIAN UNIVERSITY
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