Composite resins part II
- 2. Introduction History Definition Composition Classification Activation systems Photocuring units Properties of Resin based composites Recent Advancements
- 3. A Highly Cross linked polymeric material reinforced by a dispersion of amorphous silica, glass,crystalline or organic resin filler particles & /or short fibers bonded to the matrix by a coupling agent. Skinner’s 10th edition A 3 dimensional combination of atleast two chemically different materials with a distinct interface separating the components. DCNA
- 6. Indications /Contraindications Advantages/ Disadvantages Armamentarium Initial clinical technique Isolation Shade selection Cavity designs for composite restoration Etching Priming Bonding Curing Matrix placement Finishing & polishing Modes of Failure Repair of composites
- 7. Class I, II, III,IV,V,VI Core build ups Sealants & preventive resin restorations Esthetic enhancement procedures Cements Veneering metal crowns/bridges Temporary restorations Periodontal Splinting Non- carious lesions Enamel Hypoplasia Composite inlays Repair of old composite restoration Patients allergic to metals
- 8. Isolation Occlusion Subgingival area/ Root surface Poor oral hygiene High caries index Habits- ( Bruxism)
- 9. Esthetic Conservative Less complex Used almost universally Strengthening Bonded to tooth structure Repairable Corrosion resistant Biocompatible Cheaper than porcelain
- 10. Polymerization shrinkage Technique sensitive Higher coefficient of thermal expansion Difficult, time consuming Increased occlusal wear Low modulus of elasticity Lack of anticariogenic property Stains easily Expensive
- 17. Administration of Local anaesthetic injection
- 19. • Shade selection should be done at the start of an appointment ( Before tooth is dehydrated) • Either a natural light source or a color corrected artificial light source should be used. • Neutral color drape • Rapid comparisons with shade tabs( no more than 5 secs each) • Rapid selection- avoids eye fatigue
- 20. Vita classic Vitapan 3D master Extended range shade guides
- 23. Class III direct composite restorations Lingual approach Facial approach Tooth preparation
- 24. •Facial enamel is conserved for enhanced esthetics •Shade matching- less crucial •Discoloration- less visible Irregular alignment of teeth Facial positioning of lesion Caries lesion- positioned facially Irregular tooth alignment Lingual vs Facial
- 25. Outline form Initial tooth preparation- Class 3 preparation , initial axial wall depth of 0.2 mm into dentin Final tooth preparation 1. Removal of infected dentin 2. Pulp protection 3. Bevel placement on accessible enamel margins 4. Final procedures of cleansing & inspecting.
- 26. Initial tooth preparation • Creating access to the defective structure • Removal of faulty structures • Creating the convenience form Final tooth preparation • Removal of infected dentin • Pulp protection • Bevel placement • Cleaning & inspecting.
- 27. Bevel is prepared at 45 degree angle to external tooth surface with flame shape diamond instrument. ADDITIONAL MECHANICAL RETENTION- Gingival retention groove Dovetail
- 29. Primary caries lesion Esthetics Interim restorations Foundations for crowns Operating area with inadequate isolation Heavy occlusal stresses Proximal box extending onto root surface, Indications Contraindications
- 30. Esthetics Conservative tooth structure removal Insulation Decreased microleakage Disadvantages Polymerization shrinkage Technique sensitive Lower fracture toughness Advantages Disadvantages
- 31. Conservative cavity Box only preparation Facial or lingual slot preparation.
- 33. Creating access to faulty structure Removal of faulty structures (caries, defective restorations) Creating convenience form for the restoration
- 34. Indication Most common indication- small faulty developmental pit. Clinical procedure Preparation should be as small in diameter as possible Faulty pit entered with appropriate round bur. Fault limited to enamel. Stains should be removed.
- 36. The application of an acid to a tooth surface so that the enamel is roughened in order to allow for improved adhesion of bonding material (such as resin)Acid etching of enamel should be carried out using a 30-40% solution of phosphoric acid in gel form … — Stewart Barclay, in Master Dentistry, Volume 2, 2003
- 38. Enamel • Selective demineralization • Increases surface area • Increases lifespan of composite • Decreases marginal staining • Decreases secondary caries • Decreases post operative sensitivity • Permits efficient wetting by hydrophobic resin • Tag formation Dentine • Demineralizes dentin surface • Opens dentinal tubules • Exposes collagen • Conditions dentine for better wetting of primer
- 39. Primer is used to displace residual moisture, thus creating a surface upon which the hydrophobic bonding resin can adhere. The primer assists the adhesive to flow into and penetrate the etched tooth surface. The primer contains a hydrophilic portion that interacts with the moisture present in the tooth structure, as well as a hydrophobic end that provides bonding sites for the methacrylate monomers in the bonding resin. For example, 2-HEMA and HEMA dissolved in acetone or alcohol.
- 41. (micromechanical attachment between resin and conditioned primed dentin). Bond strength is mainly due to micro mechanical bonding of intertubular dentin. Clinical longevity of dentin bonding system is not as long as enamel bonding system 1st generation: Uses glycerol-phosphoric acid dimethacrylate. 2nd generation: Uses chloral substituted phosphate esters of various monomers. 3rd generation: Three step procedure of conditioning, priming, bonding. 4th generation: Relies on formation of hybrid layer. self-etching primers conditioning and priming-combined. 5th generation: Steps two and three are combined. 6th generation: One step procedure as all three solutions is in one bottle. 7th generation: Fluoride releasing bonding agents.
- 42. Classification of Dentinal adhesives 1. Historical strategies: i. First generation (1965) ii. Second generation (1978) iii. Third generation (1984) 2. Current strategies: i. Etch and rinse adhesives a. Three step—etch and rinse adhesive (fourth generation) b. Two step—etch and rinse adhesive (fifth generation) ii. Self-etch adhesives a. Two component—self-etch adhesive (sixth generation) — Two step—two component—self-etch adhesive — One step—two component—self-etch adhesive b. Single component—one step—self-etch adhesive (seventh generation)
- 44. Convexi T- Convex tofflemire matrix Palodent matrix system Palodent plus matricing system
- 45. Bioclear matrix system Fender matrix Composi-tight gold system Composi-tight silver system
- 46. Orange soft face 3D ring & gray thin tine G ring Stick bands 3D Clear sectional matrix system V Ring matrix system V 3 matrix system
- 47. • The composite material bonds directly to the polymerized adhesive. • The application of adhesive & composite should occur in timely manner. • The composite is inserted by hand instrument or syringe. Composites are available in two forms- • A threaded syringe for dispensing • A self contained compule that is placed into an injection syringe for dispensing, • From a threaded syringe composite is dispensed using a hand instrument. • For large restorations several 2mm increments are placed & cured.
- 50. • Poor isolation of the operating area. • White line or Halo adjacent to enamel margin • Voids • Weak or missing proximal contacts ( Class II, III OR IV) • Inaccurate shade. • Poor retention. • Contouring & Finishing problems.
- 54. Core build up
- 56. CORE BUILD UP TECHNIQUE - VIDEO https://www.youtube.com/watch?v=myT-Gm0ItxA
- 57. Pit & fissure sealants Pits & fissures result from incomplete coalescence of enamel & are particularly prone to caries. These areas can be sealed with low viscosity fluid resin after acid etching. Light activated activated UDMA Light activated activated BIS- BIS-GMA
- 59. Sealants & preventive resin restorations
- 66. Composite resins are a versatile dental restorative material which provide excellent Biomimetic effects to emulate and restore lost tooth structure. Proper technique can ensure success of this restorative material.
- 67. Sturdevant’s art & science of operative dentistry Google.co.in Pubmed.nic.in