parkell MACH Serie Mode D'emploi page 2

SUGGESTED IMPRESSION TECHNIQUES FOR MACH MATERIALS
a) Single Step / Dual Body Method (Wet-Wet or Simultaneous), where unset medium body or heavy body VPS is placed over unset MACH that has been
syringed over the teeth. The materials set simultaneously.
b) Double Step / Dual Body Method (Dry-Wet or Tray-Wash Method), where a prefab or custom tray filled with medium body or heavy body VPS is used
to make a primary impression on the teeth and allowed to fully set. After the prepping is complete, the initial impression material is relieved, cleaned,
dried and a second impression is made in the first one, using the MACH as a wash to accurately reproduce detail.
c) Laminar Flow Impression Technique, where MACH material is injected into a previously taken, properly vented, closed-mouth, preliminary impression
made from a rigid VPS such as Parkell's Blu-Mousse. The resulting impressions are strong and extremely accurate, with excellent reproduction of the
patient's bite.
NOTE: The first stage (tray) impression should not be used as a matrix for a bis-acryl temporary, if a second stage (wash) impression is
planned. The residual, uncured slick layer from the bis-acryl will interfere with the bond between the tray and wash materials, causing them
to separate upon removal.
IMPRESSION PROCEDURE USING MACH MATERIALS AS A WASH
1) Using two separate impression guns, load a MACH cartridge onto one, and the appropriate tray viscosity VPS cartridge onto the other. Twist off and
discard the sealing caps. Bleed about ¼" of material from the orifices, ensuring that it is visible at both holes. Wipe the ends clean, avoiding cross-
contamination.
2) Attach a yellow-hubbed mixing tip to the MACH cartridge and lock tight ¼ turn. Affix a yellow intra-oral tip to the end of the mixer. For increased flow,
cut off 1-2mm of the intra-oral tip. Verify that the hole at the end is round and open.
3) Attach a pink or teal-colored mixing tip to the tray material cartridge, lock tight ¼ turn, and load the tray.
4) Quickly remove the retraction cord, and rinse and dry the tooth.
5) Bleed a small amount of MACH thru the intra-oral tip outside of the mouth, and immediately syringe it into the gingival sulcus and over all the desired
teeth, keeping the tip immersed in impression material to avoid air entrapment.
6) Place loaded impression tray over teeth, and wait for tray material to set. Remove impression with a quick, firm motion.
7) Leave mixing tips on cartridges as sealing caps. Disinfect the cartridges and store them horizontally until the next use.
8) Wait one hour after removal from the mouth before pouring the impressions in dental stone. Properly stored impressions may be poured
up to 30 days later.
INSTRUCTIONS FOR USING MACH AS A WASH IN THE LAMINAR IMPRESSION TECHNIQUE
1) Take a preliminary impression with Blu-Mousse Classic or SuperFast with a double-arch tray.
2) Load a MACH cartridge onto the cartridge gun, and affix a mixing tip and an intra-oral tip. For increased flow, cut off 1-2mm of the intra-oral tip.
Verify that the hole at the end is round and open.
3) Drill holes in the buccal of the preliminary impression, mesial and distal to the prepared tooth. They should be large enough to accommodate the cut
end of the intra-oral tip.
4) Inject MACH in the mesial hole and continue injecting with a steady trigger pressure until the MACH exits the distal hole. Keep expressing until the
escaping MACH is clean and free of any blood or debris.
5) Allow the MACH to set completely before removal. Test by using a finger nail on the excess that escaped from the vent hole.
INSTRUCTIONS FOR USING MACH FOR DIE/MODEL FABRICATION
1) For the intra-oral impression, use either a hydrocolloid impression material, or a high-quality alginate such as Parkell's Triphasix™ (Stock No. S400).
Choose the appropriate-sized perforated metal or plastic quadrant impression tray.
2) Syringe the alginate into the preparation as you would for a VPS crown and bridge impression. Cover the syringed alginate with the tray completely
filled with alginate. Wait the appropriate interval and remove the tray in a firm, quick motion. Inspect for accuracy. If the alginate impression is
acceptable, spray it with a surfactant such as DeLar Surfactant.
3) If a VPS material is used as the impression material, it MUST be thoroughly coated with a separating medium AFTER IT HAS BEEN REMOVED
FROM THE MOUTH. This will prevent copolymerization with the MACH. Such media include Handler's SPL-88 (use 3-5 coats, allowing it to dry
between coats), or Miller-Stephenson Chemical Company's MS122-AD PTFE ("Teflon") Release Agent (spray entire impression lightly). Follow their
directions for use.
4) Load a MACH cartridge onto an impression gun, remove sealing cap and express 5mm (
catalyst. Securely attach a yellow base mixing tip to the cartridge, and a yellow intra-oral tip to the mixing tip. For increased flow, cut off 1-2mm of the
intra-oral tip. Verify that the hole at the end is round and open.
5) Load a Blu-Mousse SuperFast cartridge onto another impression gun, remove and discard sealing cap and express 5mm (
ensure free flow of base and catalyst. Securely attach a pink base mixing tip to the cartridge.
6) Express MACH into the impression and allow it to flow across the occlusal surfaces. Keep the tip immersed in the MACH so as not to trap air in the
material. A vibrator may be used for convenience, but is not essential. Express enough material to fill the crowns of impressed teeth to the desired
level.
7) Express the Blu-Mousse SuperFast directly over the poured MACH to completely fill the rest of the impression. Express additional Blu-Mousse into a
plastic base former and invert this onto the impression so that two Blu-Mousse layers fuse. Allow 2 minutes for complete setting.
8) Separate the impression from the poured model. Separation from an alginate or hydrocolloid impression is easy. If VPS material was used, the
model may resist removal. To separate them, remove all set VPS impression material that has expressed around the tray border or through tray
perforations. Cut the plastic tray with a separating disc and remove it from the impression, and peel the impression from the model.
9) Make sure to fully remove the separating medium from the model using an alcohol gauze before proceeding to the next step.
⁄ ") onto mixing pad to ensure free flow of base and
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