1 Zinc Phosphate Cement DA 122 Dental Materials DA 122 Dental Materials

2 Common Uses Permanent cementation (luting) –Crowns, bridges –Inlays, onlays –Orthodontic bands and brackets Insulating Base Permanent cementation (luting) –Crowns, bridges –Inlays, onlays –Orthodontic bands and brackets Insulating Base

3 Special Properties Reliable Exothermic reaction-mix on cool glass slab Bonds to tooth structure by mechanical interlocking Reliable Exothermic reaction-mix on cool glass slab Bonds to tooth structure by mechanical interlocking

4 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 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

5 Armamentarium Cooled glass slab-slows exothermic reaction Cement spatula 2 x 2 gauze square Zinc phosphate powder Zinc phosphate liquid Plastics filling instrument Cooled glass slab-slows exothermic reaction Cement spatula 2 x 2 gauze square Zinc phosphate powder Zinc phosphate liquid Plastics filling instrument

6 Zinc Phosphate Armamentarium

7 Dispensing zinc phosphate cement: 6 drops liquid to 1 cap powder

8 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. 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.

9 Mixing –Smallest increment should be brought into liquid first 1/16 th Mix for 15 seconds to totally incorporate powder into liquid Continue adding small increments, mixing slowly, wiping both sides of spatula –Smallest increment should be brought into liquid first 1/16 th Mix for 15 seconds to totally incorporate powder into liquid Continue adding small increments, mixing slowly, wiping both sides of spatula

10 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 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

11 Figure 8 mix over glass slab

12 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 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

13 Luting = ½ - 1 inch string-elongation of material when lifted

14 Roll into ball for base

15 Appearance Luting = creamy Base = putty-like, rolled into a ball Luting = creamy Base = putty-like, rolled into a ball

16 Common Brand Name Flecks  Copyright 2012 Porter & Chester Institute, Inc. All rights reserved Flecks  Copyright 2012 Porter & Chester Institute, Inc. All rights reserved