Answer Happy

Midtrial science 1. Which of the following is incorrect for the die model? a. The part that imitates the crown of the prepared tooth should be the same size and volume as the tooth to be restored 1 of 8 Root pin sizes need to be similar to a normal tooth root The most commonly used material in die model making is stone d. The pin should extend to the collum of the tooth to be restored, and should be at the same distance from all surfaces e. The most applied method in practice is the pin technique 2. Which of the following statements about impression materials are correct? L II. III. error that occurs. IV. The curing time is extended by adding a drop of water during mixing of the zinc oxide eugenol impression material. V. Impression plaster is used in mucocompressive impression technique. ba, a. LIV Calcium sulfate hemihydrate, calcium sulfate, dihydrate is obtained by calcining in various ways. Type 1 zinc oxide eugenol impression paste hardens faster than type 2 and has a more rigid structure. The lower the temperature of the impression compound at the time of taking the impression, the greater the CLB d. HLV 3. What can be done to compensate partially for the casting shrinkage of the alley? To add silica L. II. III. Increase t/r ratio Use of thermal expansion of the investment. LIV CLI a. 1 d., and 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 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 in 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