Adhesion strategies to tooth
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This document discusses different types of dental adhesives including their classification and bonding mechanisms. It describes how adhesives interact with tooth structures and the smear layer. Etch-and-rinse adhesives completely remove the smear layer while self-etch adhesives partially remove it. Proper curing of adhesives and restorations is important to achieve sufficient polymerization and avoid clinical problems. Light curing units must provide adequate energy levels to completely cure materials.
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Adhesion strategies to tooth
- 2. Operative Department School of Dentistry Tehran Azad University
- 3. Scientific classification of modern adhesivesScientific classification of modern adhesives Based on how they interact with the smear layer Trade marks
- 4. Etching remove 10 mic of enamel Etching types Micro and macro tags Micromechanical interlocking of resin
- 5. 30 – 50 % phosphoric acid mono Ca phos mono Hyd. washable Acid <27% di Ca phos. Di Hyd un washable The more concentration ….the more depth of etch until 40% At higher concentration………..reverse action
- 6. 60” 45” 30” 15” Follow by 10-15” rinsing
- 9. ETCHENTS / CONDITIONERS PRIMERS ADHESIVES
- 10. Multi step Bonding Agents
- 13. Formation of the hybrid layer following demineralization , exposing collagen fibrils and promoting by primer and adhesive infiltration Resin impregnation zone
- 14. 3-steps Separate etching+ priming+ adhesive SBMPP
- 17. Total etch adhesives Two steps ( one bottle) Separate etching +(priming, bonding)
- 19. 5th generation (one bottle)
- 21. A collection of tooth debriesA collection of tooth debries Denaturized collagensDenaturized collagens BacteriaBacteria …………....
- 22. Protection by Dentin is reduced …. When the dentin is very thin When the dentin is acid treated When cementation pressure
- 23. Complete removal (total etch) Hybridization +Resin tags All bond 2(Bisco) ……………….. (3stp) Amalgam bond pluss (parkell)…. (3stp) Clearfill liner bond (kuraray)…… (3stp) Opti bond ( kerr)………………… (3stp) SBMPP (3M) ……………………… (3stp) Excite (viva)………………………. (2stp) One coat bond ( coltene) ………. (2stp) PQ1 (ultradent) (2stp) single bond (3M) (2stp)
- 24. Self etching adhesives Slightly acidic primers Partially demineralized S.L and dentin No removing dissolved S.L a- ph=2, clear fill se bond, clearfil liner bond F ( shallow hybrid layer) b- ph=1, prompt-L-pop, prime &bond NT More penetration ,loosely organized collagen fibrils
- 27. PrimingAcid treatment Rinsing Tooth Bonding Wet bonding system Conventional system Swelling of the collagen penetrating the bond Tooth Demineralization Inhibition of penetrating the bond Shrinkage of the collagen Depending on the wet control >Over dry < >Over &
- 28. SE BOND BondingSelf-etching Priming Sealing ; filled resin ③No rinsing Tooth ②Penetrating, diffusion ①Decalicification ④reliable sealing Etching ; “MDP”(acid monomer) ＋ Water Priming ; “MDP”(adhesive monomer) ＋hydrophilic monomer
- 29. Advantages long term results hybrid layer formation Disadvantages risk of over etching Post condition rinsing Sensitive to dentin wetness Risk of too thin layer bonding tech,. sensitive
- 30. Advantages Simultaneous etching & resin penetration No post condition rinsing Not sensitive to dentin wetness Time saving Effective dentin desensitization Disadvantages Adhesion to enamel yet to be proven (Selective Etching)
- 31. Primer 20 Bond, Air, and Light 10
- 32. DD: Uncovered collagen in etch and rinse bondings
- 33. 0- cleaning isolation -Internal and external dentin wetness 2. dentin pulp protection -Use of non adhesive bases is contraindicated -If dentin <0.5 then Ca(oH)2 then GIC -RMGIC is preferred to conventional GIC 3.Adequate polymerization Time of exposure and lamp out put
- 34. One bottle- no mixing required. Etching and rinsing not required Light cured formulation Useful for direct applications with light cured restorative material. ACIDIC PRIMER ADHESIVE:- Methacrylated phosphates SOLVENT:- Water
- 35. • adhesive resin monomer (MDP, 4-META, MAC10, etc) • hydrophilic monomer (HEMA, etc) • hydrophobic monomer (Bis-GMA, DMA, etc) • solvent(acetone, ethanol, etc) • water • catalyst
- 38. 1-QTH 2-Plasma Arc lights 3- LED curing lights(2G, 3G )(lucirin , Ivocirin) 4- Argon laser lights
- 40. Selection of light curing unit is one of the most important decision you make more than 37% of composite restoration are clinically insufficiently cured( inside dentistry March 2012)
- 41. 1. unbound monomers are cytotoxic 2. under-curing can cause flex with pumping of the restoration, resulting in postoperative sensitivity.5 3. The effectiveness of a light-curing procedure depends on the light’s output power as well as its light spectrum and tip design.
- 42. The curing exposure time , resin chemistry, photoinitiator type, location and orientation of the restoration , materials that partially block the light, and the clinician’s ability to aim and maintain the light on or at the target at 90 degrees are also important factors.
- 43. inadequate polymerization and increased bacterial colonization, which can reduce bond strength, decrease retention, inferior physical properties , excessive wear, bulk fracture, color instability, and increased microleakage, secondary caries, staining, and postoperative sensitivity.11
- 44. The bottom line is that it takes about 17 J/cm2 to 20 J/cm2, which equates to 20 seconds with a 1,000- mW/cm2 light energy to obtain the optimum degree of polymerization of a composite.
- 45. Consider the limitations follow instructions to achieve good bonding
- 46. www.drnemati.ir
Editor's Notes
- With only 1 bottle 1 liquid, your handling is such simple: Apply Leave, this is an important to have 20 sec for liquid penetration Air drying, this is another important point, as the solvent must be evaporated by air flow Light No shake, mix, agita and multiple appli One question, does this CLEARFIL Tri-S Bond has strong adhesive strength worthy to trust?
- These lights contain an incandescent lamp with a tungsten filament in an inert gas with a small amount of halogen. An electric current heats the tungsten to 2727°C, creating visible light and infrared radiation, which is absorbed by the composite and results in great molecular vibration and generation of heat.8 This heat generation necessitates fan cooling, which may be noisy and result in a bioburden trap. The light is filtered to approximately 390 nm to 500 nm, which is capable of curing all composites, but the challenge with these lights is that they only use 9% of the total energy produced, with a bulb life of approximately 30 to 50 hours before they start to denature and need to be replaced. The filter can accumulate dust, crack, or delaminate, which can alter the wavelengths of light transmitted, allowing harmful UV rays to be emitted. Also, narrow light tips emit a small curing footprint, which can necessitate multiple curing cycles in large restorations. These lights have a bulb that is an aluminum oxide high-pressure vessel that contains highly pressurized xenon gas under 150 psi. The inside shape is specified to reflect light between two electrodes and the arc is about 1 mm long, enabling a very focused beam. The challenges of this light include high infrared and ultraviolet emission and a large sink radiator to strip off the extreme heat produced by these lamps. The replacement bulbs can cost up to $600. The base units are large and the unit may require a cord that is liquid-filled, which may deteriorate over time. These expensive lights may not cure all photo-initiators and the narrow light guides emit a small curing footprint. This type of unit generates light when energy is applied to an atom, raising an electron to a higher, unstable energy level. The electron will return to a stable level by releasing light through a medium of argon gas. These lights have large, heavy base units that not very portable. The tips are small, making multiple cure cycles necessary. Fast curing can cause a large temperature increase and considerable shrinkage stress, which can result in postoperative sensitivity issues. These lights may not cure all composite materials, and they are expensive. LED curing lights have gone through multiple generations. The first generation had a narrow emission spectrum that could activate camphorquinone but not other photo-initiators, and thus could not fully polymerize some composite materials. Their power and energy output was low, necessitating long curing times for a complete cure.9 The light tips had a small footprint, and the lights had an insufficient continuous operation before shutdown. The second generation of LED curing lights have a higher photon energy output. However, they have a one-color chip with a narrow emission spectrum that does not cure all composites. Many are cordless, and all batteries have a limited life expectancy, and are expensive to replace. Some have fans that are noisy and can be a bioburden trap, with the light tips subject to easy breakage. Many of these lights have the limitation of being insufficient for continuous operation, such as would be needed for cementing multiple crown-and-bridge units or veneers.10
- The spectrum of light used with light-cured dental composite materials ranges from about 380 nm to 500 nm, with camphorquinone being the most common photo-absorbing initiator. These photo-initiators absorb photon energy and react with the amine activator, creating free radicals that initiate polymerization. Camphorquinone, which has its major absorption at about 470 nm, is yellow in color. Therefore, glazes, very light-colored composites, incisal shades, and translucent shades may contain other initiators such as phenyl-propanedione (PPD) and Lucirin TPO, which have their highest absorption below 400 nm.7