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Liners & Bases (3)

Operative: Liners & Bases (Bases)

QuestionAnswer
The principal ingredient of the zinc phosphate cement powder is ........ 1. zinc oxide (≥ 90%) 2. Magnesium oxide (≥ 8%) 3. silicon dioxide (1. 5 %) 4. bismuth trioxide (0. 1 %) 5. and other minor ingredients (0. 1 %) to alter the working characteristics and final properties of the mixed cement.
The magnesium oxide is added to the zinc oxide to
The silicon dioxide is added to the zinc oxide to
The bismuth trioxide is added to the zinc oxide to
Tannin fluoride may be added to provide a source of fluoride ions in some products.
Since the H3PO4 solution absorbs water vapor ............ the bottle of the liquid shouldn't be left open longer than necessary, the liquid that becomes cloudy or forms crystals should be discarded.
What are properties of zinc phosphate cement? 1. The ultimate compressive strength of this material is (117) Mega Pascal. 2. It is radio opaque 3. it is irritant to the pulp if applied directly in deep cavities.
Since powder/liquid reaction of zinc oxide is exothermic, what should you do? mixing on cool thick and clean cement slab is recommended as a cool slab will dissipate the heat and reducing the accelerated reaction speed that resulted from elevated temperature.
The principal ingredient of the zinc phosphate cement powder is ........ 1. zinc oxide (≥ 90%) 2. Magnesium oxide (≥ 8%) 3. silicon dioxide (1. 5 %) 4. bismuth trioxide (0. 1 %) 5. and other minor ingredients (0. 1 %) to alter the working characteristics and final properties of the mixed cement.
The magnesium oxide is added to the zinc oxide to
The silicon dioxide is added to the zinc oxide to
The bismuth trioxide is added to the zinc oxide to
Tannin fluoride may be added to provide a source of fluoride ions in some products.
Since the H3PO4 solution absorbs water vapor ............ the bottle of the liquid shouldn't be left open longer than necessary, the liquid that becomes cloudy or forms crystals should be discarded.
What are properties of zinc phosphate cement? 1. The ultimate compressive strength of this material is (117) Mega Pascal. 2. It is radio opaque 3. it is irritant to the pulp if applied directly in deep cavities.
Since powder/liquid reaction of zinc oxide is exothermic, what should you do? mixing on cool thick and clean cement slab is recommended as a cool slab will dissipate the heat and reducing the accelerated reaction speed that resulted from elevated temperature.
The principal ingredient of the zinc phosphate cement powder is ........ 1. zinc oxide (≥ 90%) 2. Magnesium oxide (≥ 8%) 3. silicon dioxide (1. 5 %) 4. bismuth trioxide (0. 1 %) 5. and other minor ingredients (0. 1 %) to alter the working characteristics and final properties of the mixed cement.
The magnesium oxide is added to the zinc oxide to
The silicon dioxide is added to the zinc oxide to
The bismuth trioxide is added to the zinc oxide to
Tannin fluoride may be added to provide a source of fluoride ions in some products.
Since the H3PO4 solution absorbs water vapor ............ the bottle of the liquid shouldn't be left open longer than necessary, the liquid that becomes cloudy or forms crystals should be discarded.
What are properties of zinc phosphate cement? 1. The ultimate compressive strength of this material is (117) Mega Pascal. 2. It is radio opaque 3. it is irritant to the pulp if applied directly in deep cavities.
Since powder/liquid reaction of zinc oxide is exothermic, what should you do? mixing on cool thick and clean cement slab is recommended as a cool slab will dissipate the heat and reducing the accelerated reaction speed that resulted from elevated temperature.
If reaction speed is too of the zinc oxide is too fast, what will happen? If reaction speed is too fast, so that setting will take place before sufficient powder has been incorporated and this resulting in a mixture with 1. a high residual acidity and irritation to the pulp 2. as well as lower mechanical strength.
Water lost from the liquid ........................, while incorporation of water into the mixture will ................. . delay the setting of cement, while incorporation of water into the mixture will shorten the setting time.
Incorporation of maximum possible amount of powder into the liquid will give ..................... a. better mechanical properties b. and reduces the amount of non-reacted acid.
Mixing over a large area, incorporation small increments of powder over a large area of the slab thus 1. dissipating the heat of the reaction and 2. permit a greater quantity of powder to be added and 3. smoother mix, 4. with longer working time 5. and less acidity.
It's essential that the cement only applied on pulpal floors and axial walls why? it should not be extended over any wall that extended to cavosurface margin, otherwise it will dissolve by time and leaving a gap. Retention grooves, slots locks and coves must be cement free.
Two type of mixture consistency are made with Zinc-Phosphate cement: 1) The thin or creamy consistency (luting) for cast work cementation. 2) Thick consistency used as a base because of the ease of manipulation.
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