Fiber reinforced composits FRC Lenka Roubalíková Stomatologická klinika LF MU a FN u sv. Anny v Brně 2 Composite materials • Dvousložkové hmoty – složené hmoty • Chemically bonded combination of two or more components – final properties are much better then only the mixture. • Natural composits (wood – combination of cellulosa and lignin, bone – copmbination of collagen fibres and hydroxyapatit etc.) 3 Composite materials in dentistry Chemically bonded combination of polymer network and inorganic filler. We recognize: PFC – particles filled composits FRC – fiber reinforced composits lenka.roubalikova@tiscali.cz 4 PFC – isotropic materials • These materials can be formed in all directions aequally, their modulus of elasticity is the same in all directions. lenka.roubalikova@tiscali.cz Fiber reinforced composits • The filler is of fibers (in dentistry usually glass fibers) • Due to surface friction between organic matrix and inorganic filler the fibers overtake the loading – this is reinforcement. 5 Vlákna + pryskyřice = přenos sil -vyztužení Povrchové tření 6 lenka.roubalikova@tiscali.cz Prepregy Vytvrzené dílce 7 FRC x PFC Reinforcment (fibers) High strength in bending Anisotropy In many products silan is not present No reinforcementření mezi Low strength in bending Isotropy Silan is always present We use always FRc in combination with PFC lenka.roubalikova@tiscali.cz 8 Contemporary application of FRC lenka.roubalikova@tiscali.cz 9 Material of fibers – physical properties lenka.roubalikova@tiscali.cz Material Modulus of elasticity (GPa) Tensile strength (GPa) Colour Polyethylen 0,1 – 0,5 4 Celar Polyester 1,5 – 1,8 0,2 White Ceramics 72 2,5 – 3,5 White to yellowish Carbon Cca. 250 2,2 Black Kevlar 90 – 150 2,2 Yellow E – glass 72 2,5 – 3,5 Clear S - glass 86 4 Clear 10 Size of fibers and content of the filler - Size of fibers - Thickness hundreths of mm - Length mm - cm (for dentistry)  Content of fibers 15 – 70 weight % < 40% - low tex > 40% - high tex lenka.roubalikova@tiscali.cz 11 Organic matrix Systémová světlem tvrditelná pryskyřice Light curing resin Mixture of PMMA and light curing resin Heat curing resin lenka.roubalikova@tiscali.cz 12 Interaction between matrix and filler Silanization or Plazma coating lenka.roubalikova@tiscali.cz 13 Orientation of fibers Unidirectional Multidirectional lenka.roubalikova@tiscali.cz 14 Unidirectional FRC  Vyšší nosnost  Good strength  Susceptibility to fray lenka.roubalikova@tiscali.cz 15 Multidirectional FRC  Better adaptation  Worse strength lenka.roubalikova@tiscali.cz 16 Forms of FRCs Longitudinal elements Planar elements Root canal postsby - čepy lenka.roubalikova@tiscali.cz 17 Rate of preimpregnation (with matrix)  Dry framework  Fibers must be mixed with bond  before usage  Preimpregnated framework  Fibers and organic matrix are  mixed during the fabrication lenka.roubalikova@tiscali.cz 18 Some examples lenka.roubalikova@tiscali.cz 19 Indications of FRCs  Splints and retainers Frameworks of some fixed partial dentures Root canal posts Filling reinforcement Repaire of removable dentures Reinforcement of removable dentures lenka.roubalikova@tiscali.cz 20 Splints and retainers  Good aesthetics Combination with  RFC  Position: orally  or labially  Long of short splints  Field of application:  Periodontology  Traumatology lenka.roubalikova@tiscali.cz 21 lenka.roubalikova@tiscali.cz 22 23lenka.roubalikova@tiscali.cz 24 lenka.roubalikova@tiscali.cz 25lenka.roubalikova@tiscali.cz 26lenka.roubalikova@tiscali.cz 27 lenka.roubalikova@tiscali.cz 28 lenka.roubalikova@tiscali.cz 29 One tooth replacement – direct method  Prefabricated acrylic  tooth can be used  Or pontic can be made of  PFC directly in the mouth lenka.roubalikova@tiscali.cz 30lenka.roubalikova@tiscali.cz 31 lenka.roubalikova@tiscali.cz 32 lenka.roubalikova@tiscali.cz 33lenka.roubalikova@tiscali.cz 34lenka.roubalikova@tiscali.cz 35 lenka.roubalikova@tiscali.cz 36 37 lenka.roubalikova@tiscali.cz 38 lenka.roubalikova@tiscali.cz 39 Indirect techniques – FRc reinforced fixed dentures lenka.roubalikova@tiscali.cz 40 Náhrada jednoho zubu – nepřímá technika lenka.roubalikova@tiscali.cz 41lenka.roubalikova@tiscali.cz 42 Root canal posts – postendodontics metal posts x frc posts lenka.roubalikova@tiscali.cz 43lenka.roubalikova@tiscali.cz 44lenka.roubalikova@tiscali.cz 45 Individual FRC posts lenka.roubalikova@tiscali.cz 46 Reinforcement of fillings, intracoronal splinting lenka.roubalikova@tiscali.cz 47 Repaire of removable dentures lenka.roubalikova@tiscali.cz Source of the picture: Manual Fast Splint, BCM, France 48 Repaire of veneers lenka.roubalikova@tiscali.cz 49 Reinforcement of removable dentures Zdroj: Manuál Fast Splint, BCM, Francie lenka.roubalikova@tiscali.cz Source of the picture: Manual Fast Splint, BCM, France 50 Reinforcement of temporary bridges Zdroj: Manuál Fast Splint, BCM, Francie lenka.roubalikova@tiscali.cz Source of the pictures: Manual Fast Splint, BCM, France Other tips and tricks FRC in Dentistry Modification Tex S - 50% volume P- 60% volume Form F - flat R - round Roving U - unidirectional M - multidirectional Clinical applications One tooth replacement - direct method - indirect method Splints - intracoronal - extracoronal Prothesis reinforcment Postendodontic treatment + acid etch technique, bonding agent + particles filled composite One tooth replacement Splints Prothesis reinforcement Postendodontic treatment