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DA 122 Dental Materials. Alginate Tray Set-up Maxillary Tray Spatula Mixing Bowl Mandibular Tray Water Measuring Cup Alginate Powder & Scoop.

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Presentation on theme: "DA 122 Dental Materials. Alginate Tray Set-up Maxillary Tray Spatula Mixing Bowl Mandibular Tray Water Measuring Cup Alginate Powder & Scoop."— Presentation transcript:

1 DA 122 Dental Materials

2 Alginate Tray Set-up Maxillary Tray Spatula Mixing Bowl Mandibular Tray Water Measuring Cup Alginate Powder & Scoop

3 Armamentarium

4 Alginate Trays

5 Adding wax periphery

6 Set-up for Alginate Alginate bowls Alginate spatulas Fresh, room temperature water Measuring scoops / water vial Impression trays (metal-perforated, rimlock) or disposable-perforated Cup of mouthwash and paper towel Damp paper towel Labeled ziplock bag

7 Measure alginate and water Maxillary arch: 3 scoops alginate3 lines water (room temperature) Mandibular arch: 2 scoops alginate2 lines water Water is measured and dispensed in the plastic water measurer that comes with the materials Excess water will weaken the final set

8 Taking the Impression Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.8 Try tray in patient’s mouth Mix material Remove excess material Place gently in patient’s mouth Hold until set

9 Try in the tray Try the tray in the patient’s mouth BEFORE mixing any alginate Be sure the tray fits properly It’s best to do mandibular impressions first Less likely to set off gag reflex!

10 Mixing Alginate

11 Put measured powder into rubber bowl Incorporate water gently until completely moistened Hold bowl in left hand and spatulate with right hand Use a wiping motion Spatulate mix into creamy, homogeneous consistency Alginate should be mixed for 60 seconds Increasing the water temperature will shorten the mixing time!

12 Mixing Alginate Undermixing: Mixture will be grainy Model will have poor detail

13

14 Loading the tray A useful method is to start at the posterior and push the mix anteriorly by adding more and more to the posterior

15 Alginate Impressions – Taking the Impression Removal of Small Amount from Palate

16 Alginate Impressions – Taking the Impression Insertion

17 Alginate Impressions – Taking the Impression Holding Tray in Position

18 Removing the Impression Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.18 Ensure material is set Carefully rock tray back and forth Keep fingers steady to protect teeth Give patient wet paper towel for face Check impression for landmarks Rinse impression Disinfect impression

19 Alginate Impressions – Removing the Impression Breaking the Suction-like Seal

20 Alginate Impressions – Removing the Impression Position of Fingers Protecting Opposing Arch

21 Examine the impression: Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.21

22 Evaluate your alginate impression Smooth surface? Rounded periphery? Centered in tray? ¼ inch depth in tray? No oral cavity debris? No tray showing? No torn or thin places? Good detail? Anatomy Distals of posterior molars All sides of teeth visible Retromolar pads/ maxillary tuberosity Muscle attachment Abnormalities? (tori, etc.)

23 Alginate Impressions – Rinsing of Impression with Water

24 Alginate Impressions: Spray with Disinfectant

25 Alginate Impressions: Wrapping Alginate with damp paper towel

26 Alginate Impressions – Disinfecting the impression Ziplock bag labeled with patient’s full name


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