Manuals_files/CD Manual 12.pdf - Removable Prosthodontics

Preliminary Edemtulous Impressions - 9
The marks will transfer to the impressions and the cast when it is poured. The
clinician and technician will not have to guess the proper position. Do not allow the
patient to get saliva on the indelible mark or it will smear, or not transfer to the
alginate impression.
Making the Impression
1. Select a 12 cc. disposable syringe, cut off the tip to provide at least a 5 mm orifice
(Syringes can be sterilized and reused several times)
2. Vaseline the syringe plunger - this is particularly important if syringes have been
sterilized
3. Use an uncontaminated bowl and spatula, use regular set alginate
4. Fluff (shake) the powder, measure, tap and flatten the scoop with powder
5. Use three scoops for syringe impressions
6. Have an assistant mix the material for at least 45 seconds, until there is a smooth
creamy homologous consistency that glistens. The material should not appear
granular or lumpy.
7. The assistant loads the syringe nearly full, from the back and inserts plunger.
8. The clinician syringes a broad rope into the vestibule, beginning at the posterior,
moving quickly toward the anterior, and filling the vestibule until the labial frenum is
reached.(do not cross the midline - this traps air bubbles). The cheek should be
retracted with a mirror, instead of a finger, to provide more room for visibility. In the
maxilla, begin opposite the region of the tuberosity and inject until alginate is seen in
the hamular notch area, before moving forward. In the mandible, start with the
buccal vestibule adjacent the retromolar pad, and move forward until the labial
frenum is reached. Repeat on the opposite side. For the lingual vestibule, roll the tip
of syringe under the tongue, inject into retromylohyoid space until alginate is seen
coming upward between the tongue and the residual ridge, then move anteriorly,
filling vestibule until the lingual frenum is reached. Repeat on the opposite side. Do
not scrape the mucosa – this is a bloodless procedure!
9. If there is a steep palate, some material can be syringed into the palate, but it should
be smoothed with a finger, or voids may occur around the syringed material
10. If the patient is partially edentulous, syringe a small amount of hydrocolloid on the
occlusal surfaces (or use some of the vestibular material) and push it forcefully into
the occlusal surfaces.
11. The assistant loads the tray while the clinician is syringing
12. Place the posterior portion of the tray first, then seat the anterior of the tray