Bulk fill seems to be the new “buzz phrase” when it comes to composites.  Is HyperFIL considered a “BULK FILL” material?


Absolutely.  Although we never specifically promoted HyperFIL as a bulk fill material, the reality is that it was probably the first composite developed specifically for a bulk fill technique.


Can I use HyperFIL as a bulk fill base and layer a light cure composite on the surface?


Yes.  For shade matching purposes, if you require a shade other than the two shades HyperFIL is offered in, you can layer any composite of your choice on the surface. In such situations, no additional bonding agent is required on the HyperFIL surface so long as the oxygen-inhibited layer does not get disturbed.


Are there any advantages to using a dual cure bulk fill composite as opposed to a light cured bulk fill material?


Yes.  Because dual cure materials do not require light activation to initiate polymerization, there are no restrictions or limitations as to the amount of material you can place at one time.  Conversely, to ensure light activation, light cured bulk fill products are usually limited to a maximum of 4mm increments.  Depending on your curing lights intensity, which is something to consider in cases with deep proximal boxes, it may be necessary to place two to three bulk fill layers of a light cured composite to achieve the same result that you would get with a single bulk fill placement of HyperFIL.


How does HyperFIL handle with regard to adapting to the walls of large cavity preps?


Because of HyperFIL’s moderate viscosity, it flows nicely into all the nooks and crannies of even the largest irregularly shaped preps, thereby ensuring a void-free restoration with tight marginal adaptation.


Is HyperFIL radiopaque?


Yes.  HyperFIL has a radiopacity greater than enamel and is easily discernable on X-ray.


Is there any difference in the polymerization shrinkage of HyperFIL when it is allowed to self cure as opposed to when it is light cured?


Yes.  The volumetric shrinkage of HyperFILwhen it is light cured is 2.6%.  When it is allowed to self cure, the volumetric shrinkage is 1.63%.


To minimize shrinkage and the resulting stress on the bond itself, is the layering of HyperFIL necessary for large, high c-factor (configuration factor) restorations? 


No.  Due to its dual cure capability, HyperFIL can be bulk placed without concern for increased stress due to shrinkage in large restorations.


Can I use HyperFIL in situations where contact is needed?


Yes.   Even though HyperFIL is not compactable immediately after it is expressed from the cartridge, doctors have developed specialized techniques so they can use HyperFIL in such a manner. Available on the Parkell Web site at www.parkell.com is a technique article by Dr.David Roholt.  In this article he describes his “posterior compression technique” for creating tight contacts with HyperFIL.


Will HyperFIL posterior restorations last as long as the light cured material I am currently using? 


HyperFIL restorations are as strong, if not stronger, than currently available light cured posterior composites.  The ability to self cure in the deepest recesses of the prep ensures complete polymerization.  Self-polymerization also provides a slower, more controlled cure, which minimizes shrinkage stress.  HyperFIL also contains nanofiller (.05 microns in size), which help hold the larger macro and micro particles in place by filling the gaps in between the larger particles.  This, in turn, results in a more durable wear-resistant surface.  The combination of high strength and low shrinkage makes HyperFIL an excellent posterior composite.


Does HyperFIL contain fluoride?


No.  There is no fluoride in HyperFIL.


Can I use HyperFIL with any of Parkell’s bonding materials?


Yes.  HyperFIL can be used with any of Parkell’s bonding agents.


Can I use HyperFIL with other manufacturer’s bonding agents?


For all non self-etching (3rd, 4th, and 5th generation) bonding agents, the answer is yes.


If you use a self-etching bonding agent, it depends on the specific self-etcher you are using.  There are some self-etching bonding agents sold by other manufacturers that, due to their low pH, will inhibit the dual cure capability of HyperFIL.  Check with the manufacturer of your bonding agent to confirm if it can be used effectively with dual cure composites.  (You could also switch to one of Parkell’s self-etching bonding agents Brush&Bond® or Touch&Bond®, both of which work with self cure, dual cure and light cure composites.)


How many shades are there of HyperFIL?


HyperFIL is available in two shades: a universal A2/B2 dentin shade and an A1/B1 enamel shade.


Can I use HyperFIL for post cementation?


Yes.  Due to its dual cure capability, HyperFIL is an excellent post cement when combined with a compatible bonding agent. 


Can I use HyperFIL for core build ups?


Yes.  Due to its dual cure capability and high compressive strength (350.00 MPa), HyperFIL creates a strong, durable core for any type of final restoration.


How long does it take HyperFIL to self-cure?


HyperFIL takes about 4 minutes to self-cure.


My HyperFIL is not self curing – why?


Failure to double bleed the syringe before each use is the primary reason why HyperFIL will not self cure. 


Because post cementations, core build ups and many composite restorations often require a small amount of material, failure to double bleed results in the material from only one barrel of the syringe being dispensed into the restoration site.  Double bleeding ensures that you get proper mixing ratios from your double barreled, syringe dispensed material. 


A second reason for failure to self-cure is if you use a self etching bonding agent that has a pH of less than 2.0.  Low pH bonding agents may inhibit the self curing ability of dual cure composites.  Check with the manufacturer of your bonding agent to see if it is compatible with self-cure resins.


How do I double bleed a cartridge composite like HyperFIL?


After removing the syringe cap (or the previously used mixing tip) and discarding it, expel HyperFIL onto a pad until you see flow coming from both barrels of the syringe.  Next, attach a mixing tip and bleed a small amount of material onto a pad thru the mixer.  You have now ensured a complete mix and can proceed immediately with the restoration.


My HyperFIL sometimes seems to quick (snap) set.  Why?


Several factors can contribute to accelerated setting of any composite, including HyperFIL.  If you use peroxide as a cleaning/disinfecting agent, and fail to completely rinse it off prior to placement of a resin material, the residual peroxide will result in a “quick set” of the composite.


Using Lentulo type fillers at “full speed” for placement of resins in post holes generates heat that can result in “quick setting” of the resin.  


Should I refrigerate HyperFIL?


While not necessary, refrigeration will prolong the shelf life.  Prior to use, however, HyperFIL should be removed from the refrigerator and brought to room temperature.


What are the differences between HyperFIL and Absolute Dentin?  They appear to be very similar.


Absolute Dentin and HyperFIL are similar in the sense that they are both dual cure composites that are gun dispensed.  The makeup of the two materials, however, is very different.   Because Absolute Dentin was designed to be solely a core material/post cement, surface wear resistance is not critical; therefore, it contains only macrofill particles.  With the addition of micro and nano sized filler particles to HyperFIL, wear resistance to occlusal forces and polishability become additional properties of HyperFIL.  This enables it to be used as a final restorative material.