1 zinc phosphate cement da 122 dental materials da 122 dental materials
Post on 29-Jan-2016
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1
Zinc Phosphate Cement
DA 122Dental Materials
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Common Uses
• Permanent cementation (luting)– Crowns, bridges– Inlays, onlays– Orthodontic bands and brackets
• Insulating Base
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Special Properties
• Reliable• Exothermic reaction-mix on cool glass
slab• Bonds to tooth structure by
mechanical interlocking
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Ratio
• Luting Consistency =• 1 measure of powder– Measure to “shoulder” of powder cap
• 6 drops of liquid• Base Consistency =– same ratio BUT add more powder to desired
thickness
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Armamentarium
• Cooled glass slab-slows exothermic reaction• Cement spatula• 2 x 2 gauze square• Zinc phosphate powder• Zinc phosphate liquid• Plastics filling instrument
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Zinc Phosphate Armamentarium
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Dispensing zinc phosphate cement: 6 drops liquid to 1 cap powder
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Dispensing anddividing powder
• Shake powder bottle to fluff, dispense 1 capful, then divided into 6 parts:
– Level powder to 1 mm of thickness
– Divide into 2 equal portions
– Divide each of these into quarters
– Then divide 2 sections into eighths
– Lastly-divide one of these into sixteenths.
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Mixing
– Smallest increment should be brought into liquid first• 1/16th
• Mix for 15 seconds to totally incorporate powder into liquid• Continue adding small increments,
mixing slowly, wiping both sides of spatula
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Mixing
• Use cooled glass slab w/ cement spatula
• Mix over large area of glass slab to keep material cool (controls exothermic reaction)-use figure 8 rotary motion when mixing
• Mix time: 2 minutes• Work time: 3 ½ minutes• Set time: 7 minutes
– Can be affected by cool temperature-takes longer to set
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Figure 8 mix over glass slab
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Clean-up
• Water (mixed with baking soda) + 2x2 gauze
• IMMEDIATELY prior to setting• If material has set, will need to use a temp
cement remover solution in an ultrasonic cleaner
• Discard unused powder left on mixing slab
13Luting = ½ - 1 inch string-elongation of material when lifted
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Roll into ball for base
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Appearance
• Luting = creamy
• Base = putty-like, rolled into a ball
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Common Brand Name
• Flecks
Copyright 2012 Porter & Chester Institute, Inc. All rights reserved
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