Practical Dental Materials Lab NO 12: Dental Cements PDF

Okay, here's the conversion of the provided text into a structured markdown format. ## PRACTICAL DENTAL MATERIALS LAB NO 12 ## DENTAL CEMENTS BASED ON POLYALKENOIC ACID ### Glass ionomer cement They are adhesive teeth colored anti cariogenic cements. It was named glass ionomer because, the powder...

Okay, here's the conversion of the provided text into a structured markdown format. ## PRACTICAL DENTAL MATERIALS LAB NO 12 ## DENTAL CEMENTS BASED ON POLYALKENOIC ACID ### Glass ionomer cement They are adhesive teeth colored anti cariogenic cements. It was named glass ionomer because, the powder is glass and the setting reaction and adhesive bonding to tooth structure is due to ionic bond. **Application** 1. Anterior esthetic restorative material for class III cavities. 2. For eroded areas and class V restorations. 3. As luting agent. 4. As liners and bases. *Image of a glass ionomer cement kit with liquid and powder components* ### Glass ionomer cement **Manipulation** 1. Conditioning of the tooth surface. 2. Proper manipulation (supplied in two bottles (powder and liquid) or capsule pre-measured powder and liquid) mixed using a trituration (mixer). 3. Protection of cement during setting. 4. Finishing. ### Polycarboxylate cement It is the 1st adhesive material developed in dentistry. This cement contains two main reactive ingredients, zinc oxide and polyacrylic acid and both are in the powder; the bottle is filled with water by the dentist. In other products the powder contains only the zinc oxide and the liquid is an aqueous solution of polyacid. *Image of a Poly Zinc+ Polycarboxylate Cement kit with liquid and powder components* ### Polycarboxylate cement **Application** 1. Primary for luting permanent restorations. 2. As liners and bases. 3. Used in cementation of orthodontic bands Mixing time 30-40 seconds. Setting time 7-9 minutes (can be increased by cooling the glass slab). Powder/liquid ratio 1.5 powder: 1 liquid by weight ### POLYMERIC CEMNTS **Resin cements** A group of dental cements composed of poly methyl methacrylate PMMA or dimethyl acrylate produced by mixing an acrylic monomer liquid with acrylic polymers and mineral fillers, which is used to bond laboratory made dental appliances and restorations to teeth. **Classification of Resin Cements** * Adhesive Resins * Resin-Modified Glass Ionomer Cements * Compomers ### Adhesive resin cement **Presentation** * Self-cured, 2-paste system (phosphonate cement): *Bis-GMA Resin, Silanated quartz filler* * Light cured, 1 component system: *Bis-GMA or UrethaneDMA, Photo-initiator- Camphorquinone* * Dual-cured, 2 component system *Bis-GMA or UrethaneDMA, Photo-initiator- Camphorquinone* **Applications** *Cementation of conventional alloy crowns, bridges, and resin-bonded bridges* *-All-ceramic inlays, onlays, and crowns* *-Orthodontic brackets.* ### Properties of adhesive resin cement 1. Not soluble 2. Adhesion (micromechanical) 3. Multiple colors available 4. Extended working time for light polymerized and dual polymerized 5. Increased retention. 6. Fluid / moisture control is critical ### Adhesive resin cement **manipulation** 1. Etching the restoration. 2. Etching the tooth surface. 3. Cementing the restoration. *Image of Kerr NX3 light-cure kit and syringe* *Image of Pentron Breeze self-adhesive resin cement* *Image of EverCem Dual Cure Resin Cement Automix* ### Resin modified-GIC **Uses**: Permanent cementation of crowns and bridges. Core build up. Liners. Bonding of orthodontic brackets. **Composition** Liquid -Polyacrylic acid and a hydrophilic (water soluble) monomer such as HEMA (hydroxy ethyl methacrylate Powder: same as that for conventional GICs in addition to initiators, such as camphorquinone. *Image of i-FIX Plus Resin Modified Glass lonomer Luting Cement and syringe* *Image of Delian Restorative Cement with 7ml liquid and 15g Powder* ### Compomer **Composition**: Powder: fluorosilicate glass, sodium fluoride, Liquid: polymerized-methacrylate-carboxylic acid monomer, water, acrylate-phosphate monomer, diacrylate monomer Polymerization either 1. self-cured(chemical) or 2. light-cured initiators **Properties**: * Fluoride release. * low solubility. * high bond strength. * high fracture toughness and strength. *Image of a tube of D Line Light Curing Compomer Liner* *Image of a blue B symbol with the FCB logo in the center*