Recent advances in gic final /certified fixed orthodontic courses by Indian dental academy

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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.

Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078

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Recent advances in gic final /certified fixed orthodontic courses by Indian dental academy

  1. 1. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. RECENT ADVANCES IN GLASS IONOMER CEMENTS • IMPROVED TRADITIONAL GLASS IONOMERS HIGHLY VISCOUS GIC / PACKABLE GIC/ CONDENSABLE GIC LOW VISCOSITY GIC • METAL – MODIFIED GLASS IONOMERS MIRACLE MIX CEREMET • RESIN MODIFIED GLASS IONOMERS • POLY ACID- MODIFIED COMPOSITE RESINS / COMPOMERS • SELF- HARDENING www.indiandentalacademy.com GLASS IONOMERS
  3. 3. • NEW FLUORIDE RELEASING GLASS IONOMERS: - LOW Ph “SMART” MATERIALS - FLUORIDE CHARGE MATERIALS • BIOACTIVE GLASS • FIBRE – REINFORCED GLASS IONOMER CEMENTS • GIOMERS www.indiandentalacademy.com
  4. 4. IMPROVED TRADITIONAL GLASS IONOMERS HIGHLY VISCOUS GLASS IONOMER Due to the possibility of reduced secondary caries by fluoride release and to the comparative ease of use of conventional glass ionomers, further developments have been made for posterior restorations in primary and permanent dentition. www.indiandentalacademy.com
  5. 5. This material was developed largely as a response to the need for filling materials in the atraumatic Restorative Therapy or “ART”. www.indiandentalacademy.com
  6. 6. ART refers to the restorations of teeth under conditions of minimal instrumentation currently in use in third world nations where full dental care is not always available. www.indiandentalacademy.com
  7. 7. ADVANTAGES OF PACKABLE GIC OVER CONVENTIONAL GIC ARE:  They are packable and condensable  They are easy to place  They are non-sticky  Early moisture sensitivity is reduced www.indiandentalacademy.com
  8. 8.  Rapid finishing can be carried out  Improved wear resistance.  Low solubility in oral fluids. www.indiandentalacademy.com
  9. 9. DISADVANTAGES OF THESE GIC’S ARE:  Due to their opacity, they have esthetic disadvantages  They have limited life potential.  Moderately polishable www.indiandentalacademy.com
  10. 10. LOW VISCOCITY GLASS IONOMERS This type of glass ionomer has been developed as liners, fissure protecting materials for hypersensitive cervical areas and endodontic materials. Such materials are designed with low powder-liquid ratios and highly flowable. These are used as fissure protection materials during the eruption Period of the teeth. www.indiandentalacademy.com
  11. 11. METAL – MODIFIED GLASS IONOMER CEMENTS Glass ionomer cements lack toughness and hence, cannot withstand high-stress concentrations. GIC have been modified by the inclusion of metal filler particles in an attempt to improve toughness Two methods of modifications have been employed. www.indiandentalacademy.com
  12. 12. SILVER ALLOY ADMIX or MIRACLE MIX Sced and wilson (1980) found that amalgam alloys could be incorporated into glass ionomer cements and that these served to increase the flexure strength. Spherical silver amalgam alloy powder is mixed with Type II glass ionomer powder in the ratio 7:1. www.indiandentalacademy.com
  13. 13. CERMET – IONOMER CEMENTS: In an attempt to improve the abrasion resistance and strength of GIC, McLean and Gasser(1985) developed the “cermet”ionomer. These cements, unlike simple mixtures of alloy particles or metal fibres, contain glass-metal powders sintered to high density that can be made to react with polyacids to form a cement. www.indiandentalacademy.com
  14. 14. INDICATIONS:  As an alternative to amalgam in conservative Class I cavities in primary teeth.  Core build –up material  Lining of class II amalgam restorations.  Root caps for teeth under overdentures  Preventive restorations and temporary posterior restorations. www.indiandentalacademy.com
  15. 15. CONTRAINDICATIONS: Anterior restorations. Areas subjected to high occlusal loading. www.indiandentalacademy.com
  16. 16. RESIN – MODIFIED GLASS IONOMER CEMENT: Low early strength and moisture sensitivity of the traditional glass ionomer was the result of slow acid-base reactions. Hence to overcome these two inherent drawbacks, some polymerizable resin functional groups have been added to GIC to impart additional curing process and allow the bulk of the material to mature through the acid-base reaction. www.indiandentalacademy.com
  17. 17. DEFINITION: “Resin –modified glass ionomer materials that are modified by the inclusion of resin, generally to make them more photocurable” www.indiandentalacademy.com
  18. 18. POWDER: The powder component of a typical light- cured material consists of ion leachable glass and initiators for light or chemical curing or both www.indiandentalacademy.com
  19. 19. LIQUID: The liquid component usually contains water, polyacrylic acid with or without some carboxylic acid modified with methacrylate and Hydroxyethyl methacrylate monomers. POWDER : LIQUID RATIO = 3:1. www.indiandentalacademy.com
  20. 20. ADVANTAGES  Can be finished and polished immediately after set  Repairs can be carried out, as bond between old and new material is very strong.  Exhibits increased adhesion to composite when used a base www.indiandentalacademy.com
  21. 21.  Ideal under composite as it can be etched immediately  Fluoride release is greater than conventional GIC and compomers  High diametral strength of 20MPa www.indiandentalacademy.com
  22. 22. DISADVANTAGES: - Biocompatibility is controversial Setting shrinkage is higher (-1%) and hence, microleakage is more and marginal adaptation is poor - Lower wear resistance as compared to composite. www.indiandentalacademy.com
  23. 23. USES: • Used as a liner and base • Pit and fissure sealant • Core build-up material www.indiandentalacademy.com
  24. 24. POLYACID – MODIFIED COMPOSITE RESINS “COMPOMERS” A new variety of the usual composite resins comprising resins and inorganic filler particles is the polyacid-modified composite resin or “compomer” which was introduced in the early 1900s. www.indiandentalacademy.com
  25. 25. The compomer - combination of “comp” form composite and “omer” from glass ionomer was introduced as a type of glass ionomer, with claims that it offered some fluoride release as well as improved physical properties and clinical characteristics. www.indiandentalacademy.com
  26. 26. DEFINITION: Compomer can be defined as a resin composite with fluoride releasing Potential. Polyacid – modified glass ionomer cement is defined as materials that may contain either or both of the essential components of glass ionomer cements but at levels insufficient to promote the acid- base curing reaction in the dark. www.indiandentalacademy.com
  27. 27. COMPOSITION: The compomers presently available contain resins and fillers common to composite resins and glass ionomers. They include reactive ion-glass particle and polymerizable acidic monomers. They are usually one Component material. www.indiandentalacademy.com
  28. 28. PROPERTIES OF COMPOMERS COMPRESSIVE STRENGTH 180-240 FLEXURAL STRENGTH (MP a) 65-125(-96) DIAMETRAL TENSILE STRENGTH 25-40 FLEXURAL MODULUS (Gpa) 4.5-14(-14) AVERAGE FILLER SIZE (u m) 0.8-5 VOLUME% OF FILLER 42-67 DEPTH OF CURE (mm) 4.7 FLUORIDE RELEASE (ug / cm2) 7.8 BOND STRENGTH TO DENTIN(MPa) 18.24 with dentin bonding agent SOLUBILITY IN WATERwww.indiandentalacademy.com (% in 24 hrs) Low
  29. 29. INDICATIONS:  Sealing and filling of occlusal pits and fissures  Restorations of primary teeth  Minimal cavity preparations  Lining  Core build-up www.indiandentalacademy.com
  30. 30.  Repair of defective margins in restorations  Restorations of class III cavities  Restoration of Class V lesions  Restorations of erosion lesion  Sealing of root surface for over dentures  Potential root canal sealers  Retrograde filing materials in endodontic surgeries www.indiandentalacademy.com
  31. 31. CONTRA INDICATIONS  Class IV carious lesions  Lesions involving large areas of labial surface  Class II carious lesions where conventional cavities are prepared  Lost cusp areas  Under full metal or PFM crowns where light cannot penetrate www.indiandentalacademy.com
  32. 32. ADVANTAGES  Superior working characteristics to RMGIC  Ease of use  Easily adapts to the tooth  Good esthetics www.indiandentalacademy.com
  33. 33. TYPE II GIC METAL MODIFIED GIC RESIN MODIFIED GIC COMPRESSIVE STRENGTH(Mpa) 150 150 105 DIAMETRAL TENSILE STRENGTH(MP a) 6.6 6.7 20 HARDNESS(KHN) 48 39 40 PULP RESPONSE Mild Mild Mild ANTICARIOGENIC Yes Yes Yes SOLUBILITY 0.4 FLUORIDE RELEASE (ug F) 14 days 30 days 440 650 200 300 1200 1600 BOND STRENGTH MPa 1.1-4.5(to <TYPE II www.indiandentalacademy.com dentin) 13.4
  34. 34. DIRECT COMPARISON OF CONVENTIONAL GIC, RMGIC AND COMPOMER CHARACTERISTIC CONVENTIONAL GIC RESIN MODIFIED GIC POLYACID MODIFIED GIC Handling properties/ preparation of the material Powder-liquid systems, aqueous based; hand-mixed versions or precapsulated systems Powder – liquid Systems, Watermonomer based; hand-mixed or Precapsulated systems One component material, no water and no mixing Working time 1-2 minutes Several minutes (setting initiated by light curing) Unlimited (light Cured) Setting mechanism Acid – base reaction (4-8 minutes), second phase within the next 24 hours Light curing (40 seconds); radical Polymerisation and acid –base reaction Light curing only (40 seconds); Incremental technique www.indiandentalacademy.com
  35. 35. Moisture sensitivity after placement High, especially Moderate to low during first setting Stage ( protective covering required None Final finish Fair Excellent Adhesion to tooth Structure Self adhesive; Self adhesive; chemical bond to Primer needed for enamel and dentin Certain products Strength High compressive strength; low flexural strength High compressive Strength; medium flexural strength Wear resistance Low ; highly Viscous cementsModerate to acceptable Poor Good www.indiandentalacademy.com
  36. 36. SELF HARDENING RESIN GLASS IONOMER CEMENTS This is another recent development in resin – modified glass ionomer Luting cements. These contain certain monomers with initiators to allow self polymerization similar to those used in cold-cure acrylics It mainly contains benzoyl peroxide and amine added to the glass Ionomer. www.indiandentalacademy.com
  37. 37. Its advantages are: • Easy to handle • No significant post- cementation sensitivity • Significant fluoride release • High compressive and fracture strength • No light activation required www.indiandentalacademy.com
  38. 38. 1. FLUORIDE CHARGED MATERIALS This is a modified glass ionomer and is a two part material Restorative part Charged part www.indiandentalacademy.com
  39. 39. 2. LOW pH ‘SMART’ MATERIALS This materials is based on the fact that fluoride should be released at a low pH i.e. when caries attack may be most threatening. Hence, they are called ‘smart’ materials. The fluoride release is episodic and not continuous. This prolongs the therapeutic usefulness of the material and optimises the fluoride release. www.indiandentalacademy.com
  40. 40. BIOACTIVE GLASS The idea of bioactive glasses was developed by Hench and co. in 1973. This is an excellent material for use in maxillofacial and craniofacial surgeries as it performs hydroxyapatite. www.indiandentalacademy.com better than
  41. 41. USES  Augmentation of alveolar ridges in edentulous arches  Cementation of custom made implants into place  Correction of intra-bony pockets in periodontology  May help in the formulation of bioglass ceramics- with superior strength for fabricating crowns. www.indiandentalacademy.com
  42. 42. FIBRE- REINFORCED GLASS IONOMER CEMENTS: Newer developments in resin-modified glass ionomer cements has lead to the incorporation of alumina fibres into the glass powder to improve upon its flexure strength. This technology is called polymeric Rigid Inorganic Matrix Materials or PRIMM www.indiandentalacademy.com
  43. 43. GIOMERS: SHOFU used the hybridization of glass ionomer and composite rein to develop a new family of fluoride releasing direct aesthetic restoratives and adhesion called GIOMER characterised by pre-Reacted Glass ionomer (PRG) www.indiandentalacademy.com
  44. 44. Thank you www.indiandentalacademy.com

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