1 / 20

Fluoride-Releasing Materials I Glass Inomer Resin Modified Glass Inomer

Lecture Outline. What is glass inomer?Classification of glass inomer.Advantages

Lucy
Download Presentation

Fluoride-Releasing Materials I Glass Inomer Resin Modified Glass Inomer

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. Fluoride-Releasing Materials I Glass Inomer & Resin Modified Glass Inomer Dr.Ghada Maghaireh BDS, MS, ABOD

    3. Dental Cements

    4. “Ionomer” Acrylic acid Maleic acid Itaconic acid Butene dicarboxylic acid Vinyl phosphonic acid

    5. Acid Base Reaction Liquid acid attacks glass. Glass decomposition, metal ion release (Calcium, Aluminum, Fluoride). Migration of metal ions into liquid. Gelation of matrix by metal ions. Post-set hardening by continued binding of metal ions. Slow maturation (cross-linking, hydration, silica matrix).

    6. Simplified Diagram of Setting Reaction Polyacrylic Acid

    7. Transport media for fluoride. Stabilizes the set matrix (25 - 50% water). Solvation of ionomers/polymers and metal ions. Role of Water

    8. Glass Inomer Cement loses and gains water easily: Early moisture contamination leads to increased solubility and poor esthetics, (protect for first 7 minutes). Later desiccation causes shrinkage and crazing, (maybe even months later).

    9. How fluoride works: Inhibits demineralization. Enhances remineralization. Improves enamel crystal structure (fluorapatite). More readily taken up in demineralized enamel. Inhibits the process by which cariogenic bacteria metabolize carbohydrates (inhibits acid production). Interferes with ionic bonding during pellicle and plaque formation on tooth surface. Fluoride

    10. “halo” effect around restoration ~ 3 mm. Level around restoration ~ 10 ppm. Level in saliva of average patient ~ 0.08 ppm. Fluorine release from GIC does not lead to restoration breakdown.

    11. Fluoride Release Rates Show burst for 1 to 2 days followed by a rapid decline to steady-state. Recharging.

    12. ADA Classification Type I: luting agents (Ketac-Cem, Fuji I) Type II: restorative material a = tooth-colored (Ketac-Fil, Fuji IX) b = reinforced (Ketac-Silver, “Miracle Mix”) Type III: fast-set liners and bases (Ketac-Bond)

    13. Classification Usage Classification Restorative material Traditional (Fuji II, Ketac-Fil) Highly viscous (Fuji IX, Ketac-Molar) Metal reinforced (Miracle Mix, Ketac-Silver) Base/liner GC lining cement, Ketac-Bond Root surface sealing Cervical Cement Root canal sealing Ketac-Endo

    14. Strengths: Ionic exchange leads to adhesion to tooth structure (chemical bond). Fluoride release and “rechargeable”.

    15. GIC – Physical Properties Weaknesses Moisture sensitivity. Lack of command cure, i.e. doesn’t cure with light. Esthetics. Not recommended for stress-bearing areas. Difficult handling.

    16. High caries risk patient Atrumatic Restorative Treatment (ART) Pediatric dentistry Class V lesions Liners & bases & sandwich technique Luting agents Core buildups ??? Maybe if > 2/3 of tooth structure remains Orthopedics (bone substitute material)

    17. Steps of Clinical Use of Glass Inomer 1. Mechanical retention in preparation advised (no bevels).

    18. Steps of Clinical Use of Glass Inomer 2. Dentin conditioning (10 % polyacrylic acid for 10-20 seconds). 3. Inject into preparation. Overfill the preparation.

    19. Steps of Clinical Use of Glass Inomer 4. Trim excess with finishing bur (wet, with very light pressure as the cement material cuts easily!) and polish (if necessary). Be cautious not to over-reduce, the material is “softer” than composite resin. 5. Dry the surface and paint on a thin layer of light-cured unfilled resin (smoothes the surface and prevents desiccation but lowers fluoride release. (optional)

    20. References Chapter 13 Fundamentals of Operative Dentistry.

More Related