Preclinical dentistry Temporary filling materials Definujte zápatí - název prezentace nebo pracoviště 1 Fillings - classification acc.to consistency • Plastic (soft) fillings: Are placed into the cavity in soft consistency, in the cavity the setting takes place • Rigid fillings (inlays, onlays) Are made in the dental laboratory, are luted into the cavity using luting materials 2 Definujte zápatí - název prezentace nebo pracoviště Classification of fillings and filling materials • Temporary filling materials Are placed into the cavity for the limited time - days, weeks. • Permanent filling materials Are placed into the cavity for unlimited time. 3 Definujte zápatí - název prezentace nebo pracoviště Temporary filling materials • For temporary closure - for period of fabrication of rigid filling - in case of inflammation of gingiva (premanent filling can not be fabricated due to the bleed - for expectation - for separation of ingrowth gingiva - for lack of the time - for closure of the cavity in case of medicaments Temporary filling materials • Zinkoxid sulphate cement • Guttapercha • Zinkoxid eugenol paste and cement • Zinkoxid phosphate cement • Zinkoxid polyacrylate cement • One component materials based on gypsum and organic pastes • One component resin materials Zincoxid sulphate cement (Fletcher) • Powder: Zinc oxide, zinc sulphate. • Liquid: destilled water. • Principle of setting: Hydratation of components of a powder. • Properties: Non toxic material, good retention in the cavity • Purpose: Temporary filling material (1-2 weeks) Nowadays this cement has been replaced with one component temporary filling materials ready to use. These material usually consist of gypsum and resin and water accelerate their setting. One component materials based on gypsum and resin - Provimat HV (Spofadental, ČR) -Cavit (Espe, Německo) -LitarkfLASCOD, Itálie) -Proviso (M+W Dental, Německo) . j>—— (UK Li—1 •# PfCMSO SfPRoyisc 349/r PROVIMAT' HV Temporary Fitting MP#Ntt Prov/«onsc/i<>s FQtU/ngsmotvriMl ^ESPE w.favit JJjgj Filling Material "nany by 3M ESPE Aß Cavit ™ for fillings with occlusal loading, increased hardeness Cavit ™ W for postendo treatment, lower hardness, enhanced adhesivity Cavit ™ G temporary for the period of the fabrication od inlays,can be removed without any bur Zincoxid eugenol paste Powder: Zinc oxide Liquid: clove oil or eugenol or mixture Zinkoxid eugenol cement • Powder • Zinc oxide (69,3%) • Colophony (29,3%) • Zinc stearate(l,0%) • Zinc acetate (0,7%) • Liquid: • Eugenol 85%, olive oil 15% Zinkoxid eugenol cement • Modification • Powder: • Zincoxid (80%) or 70% zincoxid and 10% alumina • Methylmetacrylate resin (20%) • Zincstearate (1,0%) • Zinc acetate (0,7%) • Liquid: • Eugenol or eugenol (37,5) plus 62,5 EBA (etoxybenzoic acid) Zinkoxid eugenol based sealers - root canal fillings Powder: • Zinc oxide (41%), silver,colophony,thymol • Liquid: • Eugenol Zinkoxid eugenol cement Powder 70% Zinc oxide 10-15% natural and arteficial resins 1% accelerators (Zinc acetate, zinc stearate) 5-10% anorganic filler - Glass or quartz)) Liquid 85 %Eugenol, olive oil Zinkoxid eugenol cement - properties • Biocompatibility • Antiseptic • Small volume changes during the setting • Good thermal isolation • Difficult mixing • Inhibition the curing of the composite materials and adhesives Pressure resistancy max 35 MPa Zinkoxideugenol cement Principle of the setting • Zinc eugenolate is a result of the reaction between eugenol and zinc oxide. • EBA also reacts with zinc oxide. • A chelation reaction in which amorphous, zinc eugenolate is formed. • The setting is accelereted with water and higher temperature Zinkoxid eugenol cement Mixing During mixing is important to bring as much as possible powder into the liquid. The consistency is like dought, not sticky. • Application: With the dry spatula to the dry cavity Moisture acelerates setting Zinkoxid eugenol cement Indication - Expectative filling, often in combination with calcium hydroxide - Root canal filling in primary teeth (resorption) - Sealers in endodontics can contain ZOE cement - Surgical dressing in periodontology - Temporary luting material - Root canal filling material in apical surgery Non eugenol cements-oil cements • Powder • Zinc oxide • Liquid: • Aromatic oil, olive oil, white vaseline, oil acid and bee wax. Zincoxid phosphate cement, zinc phosphate cement • Powder: Zinc oxide (90%) magnesium oxide(8,2 -10%) Admixture of silicium dioxide, bismuthum trioxide, baryum oxide, calcium oxide, baryumsulphate Liquid: • Ortho phosphoric acid aequous solution -(50% - 60%) Orthophosphoric acid is buffered by adding aluminium and sometimes zinc), water (usually 1/3 of water). Zincoxid phosphate cement • Principle of the setting When the powder is brought into contact with the liquid the surface of alkaline powder is dissolved by the acid liquid, resulting in an exothermic reaction. The set zinc phosphate cement is a hydrated amorphous network of zinc phosphate that surrounds incompletely dissolved particles of zinc oxide. • Properties - Mechanical resistance odolnost (strength up to 100 MPa) - Acidity - decreases during the setting - Setting is exothermic reaction - Solubility in saliva - Good adhesion to the dry walls of the cavity - Shrinkage during setting Zincoxid phosphate cement - indications • Temporary filling, that is not next to dental pulp (pH) Initial acidity during setting may cause a pulpal response when there is only thin layer of dentin between the cement and the pulp. Therefore zinc phosphate cement is not recomended in deep cavities. • Base (thermal isolation) • Luting material • Root canal filling before apical surgery (obsolete) Products • Adhesor Normal, Adhesor Rapid (Spofadental, CR) • Harvard phosphate cement (Harvard, Germany) Zincoxid phosphate cement -mixing • On the rough side of the glass mixing block. Stainless steel spatula must be use, the powder is being admixed gradually. The consistency must be homogenous. • Setting 2-4 min or 4 - 6 min. (rapid, normal) Zincoxid phosphate cement can be mixed to two consistencies Putty: temporary filling, base Cream: root canal filling, luting materiál (for crowns and bridges) Zinc polyacrylate cement (zinc polycarboxylate, zinkoxid polycarboxylate) Powder: Identical with the powder of zincoxid phosphate cement, finer grained Liquid: Polyacrylic acid Zinc polyacrylate cement (zinc polycarboxylate, zinkoxid polacarboxylate) Setting: Zinc polyacrylate is formed Higher temperature accelerates the setting, lower temperature decelerates the setting. Zinc polyacrylate cement (zinc polycarboxylate, zinkoxid polacarboxylate) - mixing • On the smooth side of the glass mixing block with the stainless steel spatula. 26 Definujte zápatí - název prezentace nebo pracoviště Zinc polyacrylate cement (zinc polycarboxylate, zinkoxid polacarboxylate) Comparison with the zinc oxide phosphate cement Setting 7-9 min The thickness of the film is bigger Resistance in the pressure is lower • The acidity is lower - more friendly to dental pulp • No exothermic reaction • Bonding to enamel and dentine • Lower permeability Zinc polyacrylate cement (zinc polycarboxylate, zinkoxid polycarboxylate) - indication • Base • Luting • Root canal filling - rarely • Products: Adhesor Carboxy Adhesor Carbofine (Both Spofadenta, CZ) Guttapercha • Guttapercha Dried juice from the tree Isonandra gutta (percha). Chemically similar to caoutchouc Crystalline structure, thermoplastic Guttapercha • Beta phase - room temperature • Semisolid consistency • Alpha phase 42°-49° C • Plastic - Gamma phase 56° - 62° (amorheous) Expansion by heating, contraction by cooling • Slow cooling (0,5°/min) - remain in the alfa phase also by room temperature • Faster cooling-beta phase again Guttapercha as a temporary filling Is mixed with zinc oxide (4 - 7:1) • Small sticks -for heating, application with dry condensor. The closure is not hermetic, filling can be removed in one piece with the probe. Good solution for the period when inlay is being made. Guttapercha for endodontics Guttapercha 19%-22% Zinc oxide 59-79% Heavy metal salts 1% - 7% Wax or resine 1% - 4% • Material for root canal filling in combination with the sealer. It is available as guttapercha cones or in cartridges. Light curing temporary materials • These resine based materials are cured by light curing unit, they have semisolid consistency and the same indication as guttapercha for the temporyry filling (not for the root canal treatment). They do not close the cavity hermetically and can be removed in one piece.