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bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
bonding to tooth structure dental material
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bonding to tooth structure dental material

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bonding to tooth structure dental material

bonding to tooth structure dental material

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  • 1. BONDING TO TOOTH STRUCTURE
  • 2.  Macro-mechanical attachment  Chemical bonding  Micro-mechanical attachment  Interpenetration (Hybrid layer) Bonding Approaches to Tooth Structure
  • 3. ADHESIVE BONDING
  • 4. Clinical Applications  Bonded resin composite restorations.  Bonded amalgam restoration.  Cementing indirect ceramic restorations.  Root canal posts and direct resin core build-ups.  Glass ionomer restoration and cementation.  Bonding of orthodontic brackets.  Application of pits and fissures sealant.
  • 5. Difficulties  Heterogeneous composition of tooth structure  Wet tissues  Presence of saliva  Tubular nature of the dentin  Irregularities of cut enamel and dentin surfaces  Presence of debris layer (smear layer) 1. Northwest Dentistry - Journal of the Minnesota Dental Association 2. www.answers.com/topic/smear-layer 3. www.forp.usp.br/bdj/bdj12(3)/trab13123/t13123.html
  • 6. ADHESIVE BONDING TO TOOTH ENAMEL
  • 7.  Chemical Bonding Both PAA or phosphates-containing bonding agents can achieve chemical bond to HA  Micro-mechanical retention (Acid etching) Adhesive Bonding to Tooth Enamel Benefits of acid etching 1. Creating surface micro-irregularities 2. Increases the bonding surface area 3. Removes surface debris and stains 4. Increase the surface free energy Types of acids to be used  30-50% phosphoric acid (liquid or gel)  10% Maleic acid  2.5% Nitric acid  18% Hydrochloric acid
  • 8. www.nordiskadental.se/ana_etchi...composite
  • 9. Steps of acid etching  Application of the nominated acid for 15-60s  Rinsing with water-air spray for 15s  Air Drying for 15s  Enamel surface should have a white frosted appearance  This procedure is then followed with application of liquid adhesive  The restorative material (composite) should only applied after hardening (curing) of the adhesive takes place priory.com/den/resin.htm
  • 10. Enamel Bonding Agents  Diluted Bis-GMA or TEG-DMA resins.  Hydrophobic….. Bond only to dry enamel surfaces  New formulations have hydrophilic resins (HEMA) to be used for both enamel and dentin bonding
  • 11. ADHESIVE BONDING TO TOOTH DENTIN Yoshiyama et al., J. Appl. Oral Sci. 2004
  • 12.  Chemical Bonding Bonding to the HA (Ca++) o NPG-GMA (N-phenyl glycine glycidyl methacrylate) o Polymerizing phosphates (glycerophosphoric acid dimethacrylate) o Poly alkenoic acid (polycarboxylic acid) Bonding to collagen o Glutaraldehyde reacts with collagen forming a charged compounds that reacts with HEMA molecule. o 4-META (4- methyloxy ethyl trimellitic anhydride) can be used as a potential coupling agent to collage  Micro-mechanical attachment Retention of resin adhesive could be achieved to irregular dentin surfaces (inter-tubular dentin) and to the walls of opened dentinal tubules (intra- tubular dentin).
  • 13.  Interpenetration attachment Hydrophilic resin adhesive is required to penetrate the wet collagen. e.g. HEMA , PAA and NPG-GMA (N-phenyl glycerol glucidyl methacrylate) Dentin Bonding Agents (DBA) should Have both hydrophilic and hydrophobic resin components. oThe hydrophilic part is to displace the dentinal fluids and wet the surface. oThe hydrophobic part is responsible for bonding to composite filling materials.
  • 14. G Characteristics Bond strength Commercial examples 1st - 1 component - Very weak adhesion to dentin 2 MPa - Cervident - Cosmic Bond 2nd - 2 components - Weak adhesion to dentin - Prone to water-degradation 2-8 MPa - Bond Lite - Scotchbond - Dentin Adhesit 3rd - 2 component (primer +adhesive) - Bonding to metal - Reduced sensitivity 8-15 MPa - Prisma UB - Scotchbond II - Tenure - Gluma - X-R Bond Development of Dentin Bonding Systems
  • 15. 4th Generation (3 Steps) 1. Etchant 2. Primer (could be B&C) 3. Adhesive (could be B&C) 1. www.solutions.3m.com. 2. www.promedica.de/products/compblcm.htm  Total etch (E&D)  Formation of hybrid layer  Acceptable bond strength (17-25 MPa) • Compobond LCM • Scotchbond MP • Syntac
  • 16. 5th Generation (2 Steps) 1. Etchant 2. single component (Primer + Adhesive)  Total etch (E&D)  Wet bonding  Formation of hybrid layer  Acceptable bond strength (20-24 MPa) • Exite • Single-Bond • one-step
  • 17. 6th Generation (2-3 steps) 1. Self-etch primer (etchant + primer) 2. Adhesive • Prompt L-Pop • SE Bond • Liner bond  Total etch (E&D)  Formation of hybrid layer  Acceptable bond strength (18-23 MPa)
  • 18. 7th Generation (1 step) 1. Self-etch Adhesive • I- Bond • G-Bond • VivaPen  Total etch (E&D)  Formation of Nano-hybrid layer  Acceptable bond strength (18-25 MPa)

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