Adobe Systems Faculty of medicine, Dpt of restorative dentistry, ass.prof. L. Roubalikova 1 Restorative dentistry III. Repetition Adobe Systems Composite materials Chemically bonded mixture of organic matrix and inorganic fillers Adobe Systems Coupling agent – binds organic matrix and the filler together Homogenous distribution of the filler particles in the material Excellent mechanical properties 3 Adobe Systems Binding of the coupling agents to glass particles CH2=C(CH3)-R CH2=C(CH3)-R CH2=C(CH3)-R 4 H O-Si H O-Si H O-Si Double bond -polymerizable Glass particle Adobe Systems Importance of the components ̶matrix – a transfer mechanical loading on inorganic fillers, protects the filler against moisture ̶filler - a support of the material, carries the loading ̶coupling agents - a homogenous distribution of the filler in matrix ̶ 5 Adobe Systems Kompozitní materiály podle plniva ̶Makroplnivo - makrofilní ̶Mikroplnivo – mikrofilní ̶Kombinace – hybridní Økonvenční hybridní Ømikrohybridní Kompozity s nanoplnivem Adobe Systems Composition - matrix Bis GMA – Bowen´s monomer • (2,2-bis[4-(2hydroxy-3-metakryloyloxypropoxy) • fenyl]propan) • Bis DMA • UDMA • TEGMA /triethylenglykoldimethacrylate • EGMA ethylenglykoldimethacrylate • eBis –GMA • HDMA hexandioldimethacrylate Dimethacrylates 7 Adobe Systems Composition – matrix - Acid modified resins (compomers) -Polysiloxan chains with polymerizable groups (ormocers) - Silorans (ring opening monomers) 8 Adobe Systems Filler ̶Milled quartz ̶Aluminimum silicate glass ̶Silicium dioxide ̶ ̶Prepolymer ̶Complexes of microfiller (aglomerates) 9 Adobe Systems Macrofiller ̶Particles µm or tenths of µm ̶Good mechanical resistance , abrasion resistance, bad polishability. 10 Adobe Systems Microfiller • Silicium dioxide (pyrogenous) • Particles hundreths µm Less amount of filler due to big surface Lower mechanical resistence, good polishability. 11 Adobe Systems Microfiller in complex particles ̶Prepolymer ̶Aglomerates - Higher amount of filler, good mechanical resistance, good polishability 12 Adobe Systems Nanoparticles ̶ Particles 10 nm and less Special technology, size, shape and binding to monomer 13 Adobe Systems Coupling agent ̶ ̶G -methacryloxypropyltrimetoxysilan (A 174) 14 Adobe Systems Other components ̶Activator and initiator ̶Pigments ̶Fluorescents ̶Absorbers of light ̶Inhibitors 15 Adobe Systems Selfcuring composites ̶Dibenzolyperoxide Tertiary amine ̶ ̶Initiator Activator 16 Light curing composites Initiator and sometimes also activator Camphorchinon CQ Phenylpropandion PPP Trimetylbenzoylphosphino xid TPO 17 Adobe Systems Camphorchinon - CQ ̶Yellow colour ̶Activator: etyl-4-(N,N’-dimetylamino)benzoát (4EDMAB), N,N’-dimetylaminoetylmetakrylát (DMAEMA) ̶Light shades of composites: combination of CQ and other initiators. 18 Adobe Systems Composite materials – basic characteristics ̶Matrix Filler Compressive strength Elasticity Polymerization shrinkage Polymerization stress Water sorption Classification of composite filling materials Ø Size of the filler particles Macrofilled, microfilled (homogenous, non homogenous, hybrid) Ø Matrix (monomers) Dimethacrylate, acid modifies, ormocers, silorans Ø Viskosity (flowable, thick) Alert_Faser_1000 Adobe Systems History lroubalikova@gmail.com 21 Dimetacrylates Bowen 1960 – Bowen´s monomer Buoconore 1955 – acid etching Adobe Systems History lroubalikova@gmail.com 22 Fusayama 1979 Adhesion to dentin Yoshida. Nakabaiashi Van Meerbeck Adobe Systems IMG_3230a 23 lroubalikova@gmail.com Adobe Systems Adhesion ̶Mechanical adhesion ̶ ̶Specific adhesion -Intermolecular forces -Chemical binding 24 25 Enamel enaintra lroubalikova@gmail.com enaperi ena Acid on aprismatic enamel Acid on prismatic enamel lroubalikova@gmail.com Adobe Systems Dentin – special composition ̶More water – always wett ̶Less minerals ̶Low surface energy ̶Smear layer Composite is hydrophobic, we need hydrofilic substance ̶ ̶ 27 Dentin 28 DETAILZAS lroubalikova@gmail.com Bonding agent Adobe Systems 29 dentinbezsmearlayer1 smearlayer2 adhesedentin dentinkyselina lroubalikova@gmail.com DETAILZAS Adobe Systems Adhesive systems contain resin monomers 4-META • HEMA • TEGMA • PENTA P • 5-NMSA • Bis-GMA 30 Adobe Systems Adhesive systems contain resin monomers ̶Hydrophobic monomers - bond Works in enamel Does not work in dentin without primer ̶• Amphiphilic monomers – hydrophobic + hydrophilic part - primer Primer is necesssary for dentin. If applied on enamel – residual of water can be removed. ̶ ̶lroubalikova 31 Adobe Systems Dissolving agents ̶Aceton ̶Alcohol ̶Water ̶Water/alcohol 32 33 Acid etching Rinsing Priming Bonding Acod etchin Rinsing Priming a bonding Selfetching priming Bonding Selfetching bonding) Clinically oriented classification of the adhesive systems acc to number of steps lroubalikova@gmail.com lroubalikova@gmail.com 34 E:\LRd\d\Kompozita\estetické korekce\IMG_2312.JPG E:\LRd\d\Kompozita\estetické korekce\zubní ozdoba.JPG Srelfetching bonding agents lroubalikova@gmail.com 35 36 enaperi adheSe5lei dlaha6 TE – Total etch, ERA SE – Self etching SEA Adobe Systems Two steps selfetching agents Acidic hydrophilic primer – evaporation of the solvant, penetration, dissolving of the smear layer Hydrofobic bond – sealing of the surface 37 lroubalikova@gmail.com Adobe Systems One step selfetching agents More vulnerable bonding, risk of hydrolysis 38 lroubalikova@gmail.com FAKT !!! > 39 > Source: Dudek M. Adhezivní spoj a adhezivní systémy I. LKS 11/2013 lroubalikova@gmail.com Smear layer layer Dentin tubules > pH of the adhesive system thickness of the hybrid layer surface of dentin smear layer impregnated resin tag with the adhesive system very mild acidic sea mild acidic sea acidic sea strong acidic sea 40 Colagen fibers with interfibrilar and Instrafibrilar crystals od hydroxyapatite Colagen fibers with intrafibrilas crystals of hydrpoxyapatite only Colagen fibers without crystals of hydroxyapatites Zdroj obrázku: Dudek M. Adhezivní spoj a adhezivní systémy I. LKS 11/2013 lroubalikova@gmail.com Adobe Systems ̶Protection of collagen against hydrolysis as well as enzymatic degradation of collagen (due to activation of matrix metaloproteinasis) -Strong mineral acid id dangereous for good long term bonding -Clorhexidin for one minute can stabilize collagen Importance of hydroxyapatite 41 Definujte zápatí – název prezentace nebo pracoviště 42 Jo3JPEG-1 Enzymatic degradation of collagen lroubalikova@gmail.com 43 G:\počítačdoma\fotkyzuby\DSC_0128.JPG Ceram-X Duo_Class II_13 Adobe Systems Factor that influence the quality of bonding Structure and composition of hard dental tissues Quality of their surface – esp. presence of smear layer, contamination with moisture, saliva and blood Configuration factor – C- factor Mechanical loading of the adhesive connection Oral environment and external chemical materials (tooth pastes, asntiseptics, bleaching agent rtc.) 44 lroubalikova@gmail.com Adobe Systems ̶Quality of the material ̶C- factor ̶Mode of application ̶Mode of polymerization ̶ Polymerization stress depends on Definujte zápatí – název prezentace nebo pracoviště 45 Adobe Systems ̶Quality of the material ̶C- factor ̶Mode of application ̶Mode of polymerization ̶ Polymerization stress depends on Definujte zápatí – název prezentace nebo pracoviště 46 Adobe Systems ̶Quality of the material ̶C- factor ̶Mode of application ̶Mode of polymerization ̶ Polymerization stress depends on Definujte zápatí – název prezentace nebo pracoviště 47 lroubalikova@gmail.com 48 > High content of filler increases the modulus of elasticity High modulus of elasticity increases the polymerization stress High content of filler decreases the polymerization shrinkage Polym. Stress Modulus of elasticity Polymerization shrinkage Adobe Systems ̶Quality of the material ̶C- factor ̶Mode of application ̶Mode of polymerization ̶ Polymerization stress depends on Definujte zápatí – název prezentace nebo pracoviště 49 50 c1 c3 c5 5 2 1 Bonded area : Free area 1:1 and less - optimal Adobe Systems ̶Quality of the material ̶C- factor ̶Mode of application ̶Mode of polymerization ̶ Polymerization stress depends on Definujte zápatí – název prezentace nebo pracoviště 51 Adobe Systems Mode of application ̶Incremental technique Layer by layer with big free surface ̶Importance of flowables Thin layer of flowable first –big free surface Good marginal adaptation Compensation of the stress of the other layers Bulk fill materials do not solve the problem with polymerization stress Definujte zápatí – název prezentace nebo pracoviště 52 Placement of the material Adobe Systems ̶Quality of the material ̶C- factor ̶Mode of application ̶Mode of polymerization Polymerization stress depends on Definujte zápatí – název prezentace nebo pracoviště 54 Monomer Light Polymerization Polymer Adobe Systems Pre –gel Gel Post -gel Pre gel phase should be long – soft start !!!! Adobe Systems Three phases Phases -Pre-gel – material is soft -Gel-point – material became hard -Post –gel – material is not soft, postgel shrinkage Fotokompozit 102mm 48mm Photocpomosite 3,2mm 57 mm 3mm 8,5mm Selfcuring material 434343 43mm 42mm Adobe Systems ̶Longer pre-gel phase is better for releasing of polymerization stress -Soft start -Combination of materials (selfcuring composite materials have longer pre gel phase) Duration of pre-gel phase Definujte zápatí – název prezentace nebo pracoviště 61