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Cinch FAQ
Views: 2860 Created: 10/14/2010 21:21 Last Updated: 10/28/2010 10:14

Cinch/Quick Cinch Impression Material


Does Cinch come with different set times?


Yes.  The Cinch line has a 4-minute intraoral set time.  The Quick Cinch line has a 90-second intraoral set time. 


Do both Cinch and Quick Cinch product lines provide the same working time?


No.  Quick Cinch products have a 60-second working time at room temperature.  Cinch offers a 3-             minute working time at room temperature.


Can I make a Mach-2® model from a Cinch impression?


Sure, you can make such a model, but only if you take special precautions!  Given that Cinch and Mach (Mach-2, Mach-Slo) are both Polyvinyl Siloxane (PVS) products, they will fuse together if you inject Mach materials directly into a Cinch impression.  To prevent this fusion of similar materials, a Teflon® releasing agent must be applied to the entire Cinch impression surface first.  This sort of releasing agent is available from Miller-Stephenson (Phone: 203.743.4447).  Ask for item MS-122AD.  (NOTE:  Silicone releasing agents will NOT work.)


Why isn’t Cinch setting around the prep?


The most likely cause is contamination of the impression site by either latex, a sulfur containing product, or methacrylate residues.

1.      Latex contamination can occur by contact with latex gloves or a rubber dam. 

2.      Sulfur compounds are found in retraction cords and hemostatic agents which contain Aluminum or Iron Sulfate.

3.      Acrylic or methacrylate residues from bonding agents and restorative resins are the result of failure to remove the oxygen-inhibited outer layer of resin from the surface.  Examples include composite core build-ups and sealed preps. To avoid this problem, remove this outer uncured layer prior to impressioning.  Additionally, avoid making temporaries inside final impressions that you plan on using for reline wash impressions.


How do I remove sulfate and latex contamination from the impression site area?


Scrub the affected area with gauze saturated with a 5% hydrogen peroxide solution.  Follow this by rinsing the area with copious amounts of water.


How do I remove methacrylate/acrylic residue?


Scrub the resin’s cured surface with Cavidry (Parkell Item # S099) or acetone, followed by rinsing with copious amounts of water.  Alternatively, you can use rotary finishing instruments to remove this outer layer.


When I inject Cinch into a tray or directly into the mouth it doesn’t look completely mixed –why?


You are probably not double bleeding the cartridge before dispensing the material.  (See “What is Double Bleeding . . .” below.)  Occasionally you may see minor streaking in the final impression.  This streaking will not affect the accuracy or stability of the fully-set impression.


What is double bleeding a cartridge and how do I do it?


Double bleeding is a series of steps that ensures proper mixing ratios when any cartridge dispensed material is used.  After removing the cartridge cap (or the previously used mixing tip), and discarding it, expel Cinch onto a pad until you see flow coming from both barrels of the cartridge.


Next, attach the appropriate sized mixing tip and bleed a small amount of material onto the pad.  You have now ensured a complete mix and can proceed immediately with dispensing the impression material into a tray, or directly into the mouth.


What should I use to recap the Cinch cartridge?


After the initial use, you should discard the cap that came on the cartridge.  To keep the cartridge sealed between uses, leave the last used mixing tip on the syringe.  Since the material hardens in the tip, it will seal the cartridge as effectively as the original cap, while preventing contamination of the cartridge itself.


Why is it so difficult to dispense the heavy body materials from the cartridge? 


You are probably using the wrong size mixing tip.  For all Cinch Heavy bodied materials you should use the large blue-green colored mixing tip.  (Parkell Stock # S496.)


Can I use Parkell’s Sharp Premium Wash VPS Impression Material with Cinch Heavy or Medium bodied tray materials when I take my single stage impressions?


Product lines are developed to optimally work with other products in the same line; therefore, our preference would be to use Sharp with Sharp, and Cinch with Cinch.  However, since both product lines are PVS materials, you can mix and match them to suit your needs.  If you are going to “mix and match,” it is important to remember that Cinch and Sharp have different intraoral set times.  Be sure to leave the impression in the mouth for the amount of time required for the slower setting of the materials to fully set.


Which Cinch product(s) would work best as an alginate substitute?


Either Cinch 90 (90-second set) or Cinch Platinum (3-minute set) would be ideal products to use as an alginate substitute.


Since you recommend Cinch can be used as an alginate substitute, does that mean I should be concerned about using it for my final impressions for crowns, bridges and removable prosthetics?


Not at all.  Cinch has been used successfully for many years by thousands of satisfied dentists as their impression material of choice for their prosthetic cases.  It exhibits all of the properties clinicians look for in an impression material for such cases, including:

1.      Dimensional stability.

2.      Accuracy and detail.

3.      High tear strength.

4.      Hydrophilicity.

5.      Contrasting colors between viscosities that result in easy readability of the impression.


Which Cinch product(s) would work best as a monophase impression material?


Either Cinch 90 or Cinch Platinum will provide the hydrophilicity, accuracy, tear strength, and dimensional stability you expect and need from a monophase material.


What is the difference between Cinch and Sharp materials?


Aside from the physical properties of working time, set time and final hardness the materials obtain when set, the main difference between the two impression lines stem from the era in which each material was developed.  Cinch uses tried and true PVS chemistry which results in detailed, precise impressions.  Sharp’s formulation incorporates the latest in PVS chemistry, which allows for improved hydrophilicity and tear strength.      


Can I use Cinch in combination with materials such as Impregum?


No.  Polyvinyl siloxane (PVS) materials such as Cinch are not compatible with polyethers (Impregum)  or polysulfide (rubber-based) materials.


How should I disinfect my impression prior to sending it to the lab?

Use a hospital-level disinfectant that is EPA-registered as “tuberculocidal” for the appropriate time as specified by the manufacturer of the product.  Water-based disinfectants are preferred. 


How quickly can I pour a Cinch impression?


A Cinch impression can be poured in as little as 15 minutes after it is removed from the mouth. 


What is the longest I can wait to pour a Cinch impression?


Impressions stored at room temperature may be poured for up to 30 days.