Karteikarten
materials-lec1
Karten in diesem Stapel (30)
- 1-GIC's are not very irritant to the pulp because they consist of poly acrylic acid that has a large particles which cannot penetrate dentinal tubules (T-F)TRUE
- 2-GI cements are effective in pulp exposure cases (T-F)FALSE
- 3-there is more than one type of acid in the composition of GIC's (T-F)TRUE
- 4-The MAIN type of adhesion for GIC's is (micromechanical) (T-F)FALSE,
mainly its chemical - 5-what is the name of the resin component in resin modified GIC's?HEMA
- 6-there is no need to place resin modified GIC's in increments since there is no fear of shrinkage (T-F)FALSE,
they must be placed in increments because they might shrink due to resin content - 7-calcium silicate is a main component of .......................?bioceramics
- 8-zinc phosphate cements contain phosphoric acid which is very strong , and thats why we use these cements as a liners (T-F)FALSE,
phosphoric acid is so irritant to the pulp, so we dont use zinc phosphate as a liner - 9-zinc polycaboxylate cements can be used with try-in crowns by mixing powder with water rather than phosphoric acid (T-F)FALSE,
zinc phosphate** - 10-zinc phosphate cements have an exothermic reaction, so its recommended to be mixed on a cold slab in order to absorb heat (T-F)TRUE
- 11-zinc polycarboxylate cements are CHEMICALLY adhered to tooth structure because they contain phosphoric acid (T-F)FALSE,
because they contain poly acrylic acid** - 12-zinc phosphate cements setting time are affected by temperature, so the greater the temp, the slower the setting reaction (T-F)FALSE,
the greater the temp the quicker the setting reaction** - 13-type of adhesion for zinc phosphate cements is CHEMICAL (T-F)FALSE,
(note; they dont contain poly acrylic acid in their composition) - 14'reduces brittlness+improves cohesion' which component of ZOE cements is related to this function?rosin
- 15......................... and ............................. oils are used with ZOE if the patient has an allergy to eugenolcarboxylic acid and chlorothymol
- 16what is the function of zinc acetate in ZOE cements?an accelerator
- 171) in ZOE type II, we reinforce the cement by adding ......................... to the LIQUID eugenolEBA
- 18ZOE type of adhesion is (chemical) (T-F)FALSE,
its mechanical - 19regarding type I of ZOE cements, which is true? A.) its a (powder-liquid) system. B) it used as a weak liner. C) its a (paste-paste) system composed of base (brown) and catalyst (white). D) it used as a temporary cement.D
- 20regarding ZOE cement which is false? A) type of retention (mechanical) B) type III is used as a strong base. C) it has a sedative effect on the pulp. D) if any excess gets on patient's lips we can dissolve it using eugenol oil.D (orange oil**)
- 21regarding esthetic resin cements, 1) porcelain surface is etched using phosphoric acid, while 2) tooth surface is etched by using hydrofluoric acid.BOTH ARE FALSE
- 22whats the name of the acid that used in etching porcelain surface?hydrofluoric acid
- 23regarding adhesive resin cement, which one is false? A) its not preferred for veneers. B) it has low color stability. C) it has quomphorquinones which may cause yellowing with time. D) "Panavia F" is a special AHDESIVE resin cementC
(it has amine co-initiators >>>yellowing**) - 24self adhesive resin cements are composed of (adhesive groups), which makes them bond to tooth structure without need for etching and bonding. (T-F)TRUE
- 25regarding temporary resin cement, which one is true? A) mostly its light cured. B) etching and bonding are required. C) it better to be used when the final cementing material is made out of resin. D) ZOE is more effective when the final cementing material >> resinC
- 26compomer cements are not used for ceramic restroations as they contain HEMA which can absorb moisture leading to cracking of ceramic restoration. (T-F)TRUE
- 27high strength bases are best used in (1-2 mm) to insure a good insulation to the pulp. (T-F)FALSE,
(0.5-0.75) mm ** - 28regarding calcium hydroxide liner, which one is true? A) used in indirect pulp capping. B) it has a low pH, makes it an antibacterial. C) light cured version contains HEMA as a resin component. D) dycal is a popular brand name for it. E) light cured type has higher solubility than the chemical cured type.D
- 29regarding varnishes, which one is false? A) they help in sealing dentinal tubules. B) composed of resin dissolved in chloroform or alcohol. C) one layer is enough for coverage.C
(2-3) layers are needed* - 30what is the name of resin component in the light cured version of calcium hydroxide liner?UDMA