Dr.HINA ADNAN. It is a tooth colored restorative material that is composed of organic resin matrix...
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COMPOSITE RESTORATIVE MATERIAL Dr.HINA ADNAN
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Transcript of Dr.HINA ADNAN. It is a tooth colored restorative material that is composed of organic resin matrix...
- Slide 1
- Dr.HINA ADNAN
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- It is a tooth colored restorative material that is composed of organic resin matrix and inorganic filler particles dispersed in it
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- 1\ORGANIC RESIN MATRIX: a thick liquids made up of two or more organic molecules that form a matrix around filler particles Most commonly : bis-GMA (bisphenol A glycidyl methacrylate)
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- 2\ INORGANIC FILLER PARTICLES: Fine particles of quartz, silica or glass dispersed in the matrix. Importance of fillers: 1\they give strength and wear resistance to the material 2\Reduce polymerization shrinkage
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- ACCORDING TO FILLER SIZE COMPOSITES CLASSIFIED INTO: 1\macro filled(large particles) 2\micro filled(small particles) 3\hybrid (combination of the two)
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- 3\COUPLING AGENT: (Silane coupling agent) A chemical that adheres the inorganic fillers to the matrix to provide stronger bond.
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- The process of composite setting reaction is a polymerization reaction. ACTIVATION OF POLYMERIZATION: 1\chemical activation (self-cured) 2\light activation (light-cured) 3\combination (dual-cured)
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- Chemical cured composite resins Two paste systems(base + catalyst) Disadvantage: the operator has limited working time(usually it takes 2 minutes before the material becomes stiff to manipulate)
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- One paste Activated by visible blue light source Advantages: 1\requires no mixing 2\the operator can control the working time
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- Two paste system Light and chemical activation Advantage: After light curing the chemical setting reaction continues in areas not reached by the light
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- 1\MACROFILLED COMPOSITE: The first generation composite(conventional composite) Large particle size Disadvantage: 1\difficult to polish 2\become rough as filler particles are lost from surface this causes the restoration to be more susceptible to discoloration
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- 2\MICROFILLED COMPOSITE: Smaller filler particles When polished they produce very smooth shiny surface. Disadvantage: Poor physical properties(weaker,less wear resistant,greater polymerization shrinkage)compared to other types.
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- 3\HYBRID COMPOSITE They contain both macro fillers and micro-fillers Advantages: Strong material that can be polished to a high shine
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- 4\ flowable composites These composites flow readily and can be delivered directly into the cavity by small needle. Uses: 1\preventive resin restoration(in small preparations) 2\pit and fissure sealants
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- High viscous resins that contain a high volume of filler particles, which gives them a stiff consistency They are stronger and more wear resistant
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- 1\restoration of posterior and anterior teeth 2\pit and fissure sealant 3\cementation of fixed prosthodontics
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- 1\Large proximal lesions. 2\When the patient has an allergy to the material. 3\Restorations of root caries.( better to use glass ionomer cements)
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- THANK YOU