materiali dentari

The correct answers about the hydrocolloids are: The agar impression materials are irreversible hydrocolloids. The alginates are reversible hydrocolloids. Are elastic materials. Dimensionally unstable.

The FALSE answer about alginate are: It's an elastomer. Its an elastic material. Easy manipulation procedure. Dimensional stable.

The elastomers: Are rubber like materials. Polysilicone are not elastomers. Has dimensional stability. Are reversible.

The CORRECT answer about gypsum are: Type 1 is used for hard dies. Type 1 is used for impression. It's a brittle material. There are 8 types.

The true answer about Biocompatibility of dental materials are: The materials should not harm the pulp. Should not contain xenoestrogen. Should undergo biodegradation. Should sensitize and produce allergy.

Which metal is the most toxic: Gold. Chromium. Nickel. Cobalt.

The correct answers about the temporary restorative materials are: It should have the ability to promote the healing process. Zinc oxide eugenol is not temporary material. It should have antibacterial and cariostatic properties.

According to the PH values of cements: Silicate cement is an acidic cement. Zinc oxide eugenol is an acidic cement. Zinc oxide eugenol is almost neutral. Calcium hydroxide is an acidic cement.

About the composite resins: Hard to manipulate. Superior aesthetics. Easy to manipulate. Cheeper than amalgam.

The correct answers about the bondings: There are 5 generations of bondings. The most common acid etchant is phosphoric acid 37%. There are 7 generations of bondings. Mechanical bonding is achieved by glassionomers.

Impression materials are: Used in endodontics. Auxiliary materials. Restorative dental material. Used in prosthodontia.

The materials that is not used in Prosthodontics are: Impression materials. Wires. Gypsum. Resins.

What are the challenges of dental materials in the oral cavity?. The force of the muscles in the area. The PH of the saliva. The enzyme activities. All answers are correct.

The impression trays: Are only metallic. Support the impression materials. Can be reusable. We can not individualise a tray.

The impression material are used to: Register the forms and the relationships of teeth. To cover an empathy space. Reproduce the forms and the relationships of teeth. All the answers are correct.

The impression materials: Cannot be ideal. Must be nonpoisonous. Must be nontoxic. All the answers are correct.

The ideal requirements of the impression materials are: Low viscosity. The taste on odour of it are not important. Chemically inert in oral comditions. High thermal conductivity.

The FALSE answer about the impression materials is: Zinc oxide eugenol is not an impression material. The waxes and the compounds can be used as impression materials. Alginates are hydrocoloids. Can be elastic and non elsastic.

The impression trays: Can be perforated. Can be reusable. Can be sectional. All the answer are correct.

Advantages of the Zn OE impression materials: Dimensionally stable. Does not adhere well to dried surfaces. Easy to manipulate. It's easy to use when we have undercuts.

WHEN CONSIDERING THE SHELF LIFE AND EXPIRATION DATE OF A DENTAL IMPRESSION MATERIAL THE IMPORTANT THING TO REMEMBER IS: all materials gradually degrade over time causing a gradual decline in their reliability. all materials can be used reliably over time long past the expiration date. all materials can be used reliably regardless of storage temperature after the expiration date.

THE ASPECT OF AN ADEQUATE ZPC, READY FOR USE IS: Putty-like for luting. Creamy for base. No answer is correct.

BIOLOGIC EFFECTS OF ZPC: not determine pulpal irritation in deep cavities;. the film thickness for cementing should not exceed than 25 microns. the film thickness for cementing should exceed 30 microns.

CLASSIFICATION OF DENTAL MATERIALS: biotolerated. bioinert and bioactive. both answers are correct.

FOR REDUCING THE EXOTHERMIC REACTION OF CEMENTS: mix on warm glass slab;. mix on cool glass slab. no answer is correct.

ZINC HYDRO-PHOSPHATE CEMENTS: have clinical advantage over the conventional ZPC;. are called water-settable cements. their basic pH is similar to that of ZPC.

CALCIUM HYDROXIDE TYPES OF CEMENTS: their mechanical properties are stronger than those of GIC;. stimulate the formation of reparative dentin. has a low value of pH.

ZSPC (zinc silicophosphate cement): is less soluble than zinc phosphate cement. the acidity is similar to that of the ZPC. both answers are correct.

OF DENTAL TYPES OF CEMENT BELONG: ZPCs, SCs, SPCs. ZnOCs, GICs, CR, cements. Both answers are correct.

SILICATE TYPES OF CEMENT (SC): used for the restoration of anterior teeth. is translucent. both answers are correct.

WHICH OF THE FOLLOWING ARE ADVANTAGES OF REVERSIBLE HYDROCOLLOID?. low-cost;. pleasant color;. all of above.

*GLASS CARBOMERs: their properties are equivalent to natural dentition. are nano base Fluoride Aluminum-Silicate Glass with mineral additions. are nano base Fluoride Aluminum-Silicate Glass without mineral additions.

OF ACID-BASE DENTAL TYPES OF CEMENT BELONGS: ZnP, and GIC cements;. PCC, and SC cements;. Both answers are correct.

IRREVERSIBLE HYDROCOLLOIDS CONSIST PRIMARILY OF: borax. agar-agar. none of the above.

WHEN TAKING EITHER AN IMPRESSION FOR FIXED RESTORATION, THE MOST IMPORTANT PREDICTOR OF ACCURACY WOULD BE: detail reproduction. compatibility of gypsum with the impression material. all of above.

ARMAMENTARIUM (INSTRUMENTS) FOR MIXING ZPC: glass plate, spatula; mixing device for encapsulated systems. cement plate, explorer. none of the above.

REFRIGERATION OF ELASTOMERIC IMPRESSION MATERIALS IN ORDER TO INCREASE THE WORKING TIME IS AN ACCEPTABLE PROCEDURE: True. False.

LIGHT-CURED GIC: Are hybrid materials. originally developed for cementation;. contain spherical silver amalgam alloy.

BIOLOGIC EFFECTS OF ZPC: the freshly mixed ZPC is highly acidic after mixing, with a pH of between 1-2;. after 24 hours, the pH is usually 6 to 7. Both answers are correct.

* COMPOMERs: Combine fluoride release of GIC and durability of composites. liquid contain strontium aluminum fluorosilicate glass particles and metal oxides. can be used as a pit and fissure sealant.

DENTAL TYPES OF CEMENT MAY BE CLASSIFIED IN: mineral and organic:. organo-mineral;. Both answers are correct.

* ORMOCERs: Are organic-inorganic copolymers. based on organically modified zinc sillicophosphate cement (ZSPC);. based on organically modified zinc sillicophosphate cement (ZSPC);.

ADVANTAGES OF ZPC: set lo a very strong mass;. can be mixed easily;. solubility in oral fluids;.

ZINC SILICOPHOSPHATE CEMENT (ZSPC): is not a hybrid cement. the powder contain a high percentage of an acid-soluble silicate;. is the combination of ZPC and GIC (glass ionomer cement).

* Which of the following polymer systems are used for the organic matrix in composites?. Bisphenol a-glycidyl methacrylate (BIS-GMA). Urethane dimethacrylate (UDMA). Polstyrene.

* CERMETS (MMGIC): Are glass powder fused to silver particles through sintering. Powder react with polyacid to form the cement. Contains spherical silver amalgam alloy.

METALLIC TYPES OF ZPC: ZPC with silver is red. ZPC with copper is black;. Both types of cement present a lack of chemical adhesion.

HYDROPHILIC" WHEN USED IN REGARDS TO A P.V.S. IMPRESSION MATERIAL MEANS: The material “likes” very much the water and is attracted to it. the material ''likes" water enough for the dentist to be less concerned about pouring the Impression in gypsum;. the material "likes" very much the mo1sture in disinfectants.

THE FINE GRAIN OF ZPC: used as an Insulating base In deep cavities;. creates a very thin film layer. the powder is acid.

THE FINAL SET DENTAL CEMENT IS COMPOSED OF: A core unreacted powder. A core reacted powder. No answer is correct.

ZPC (zinc phosphate types of cement): the alkaline power can be with very tine gr-air and with medium grain;. present 2 types, For cementing and for other uses;. Both answers are correct.

*The Objectives during condensation of amalgam are: Adaptation to cavity walls. Development of a compact mass free from voids. No change in mercury concentration from that used in the mix.

* Indicate wether the following impression materials are classified as flexible : Poly-sulfide rubber. Silicone rubber. Impression plaster.

Indicate wether the following impression materials are classified as rigid : Agar-hydrocolloid. Polyether rubber. Dental impression compound.

According to the purpose, filling materials are: temporary fillings;. permanent fillings;. both answers are correct.