4. Which of the following is not cause of the porosity? a. Mixing of powder and liquid components. b. Vaporization of un

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4 Which Of The Following Is Not Cause Of The Porosity A Mixing Of Powder And Liquid Components B Vaporization Of Un 1 (89.26 KiB) Viewed 14 times

4. Which of the following is not cause of the porosity? a. Mixing of powder and liquid components. b. Vaporization of unreacted monomer and low-molecular-weight polymers c. If denture base exhibits a thin thickness. d. Air entrapment during mixing and pouring procedures. 5. Which of the following is true for dental impression materials? a. Impression materials are used to reproduce and record the forms and relationships of teeth and soft tissues. b. All impression materials are extremely rigid. c. Alginate hydrocolloid and elastomeric impression materials are now obsolete impression materials. d. the patient's preference should be taken into account when selecting the impression material. e. Clarity, working time, strength, clastic properties and smooth surfaces on plaster surfaces are not important for dental impress kin materials. 6. Which of the following is false regarding alginate hydrocolloids? a. Dental alginate impression material transforms from sol phase to gel phase by chemical reaction. b. Alginate hydrocolloids are called irreversible. c. Alginate impression material is used to obtain models for treatment planning, to make temporary denture and removeable partial dentures. d. Alginate impression materials do not have good fluidity and do not reflect anatomical details at an acceptable level. e. Alginate impression materials products have acceptable elastic properties and good properties compared to convertibles