What is the compressive strength of SDR?
Question: What is the flexural strength of SDR?
Question: What is the average particle size?
Answer: 4.2 microns
Question: What is the filler percentage by weight and by volume?
Answer: 68% filled by weight and 44 % filled by volume
Question: What is the shelf life of SDR?
Answer: 2.5 years
Question: What is the radiopacity of SDR?
Answer: 2.2mm Al
Question: Does SDR release fluoride?
Answer: Yes, SDR releases fluoride
Question: What is the Barcol or Shore hardness value of SDR?
Answer: The Medium Barcol hardness of SDR = 98
The Hard Barcol Hardness of SDR = 64
Question: What is the shrinkage of SDR?
Answer: The shrinkage of SDR is 3.5%
Question: Is the cure time of SDR the same for halogen and LED lights?
Answer: Yes, the cure time of SDR is 20 seconds with a minimum output of 550mW/cm2
Question: How many shades of SDR are available?
Answer: One universal shade of SDR is available
Question: Are there plans to add more shades of SDR?
Answer: We will continue to look at the addition of shades of SDR in the future but the offering of one universal shade allows the clinician to maintain fewer shades and simplifies the procedure.
Question: Is SDR a stackable flowable?
Answer: SDR possesses a self leveling handling which allows it to flow into the nooks and
crannies of the prep to ensure excellent cavity adaptation. Handling is between Esthet•X® Flow composite and Dyract® Flow composite. It is not considered “stackable”
Question: Does SDR have nano-technology?
Answer: Yes, it contains 2-3% nanofiller by weight
Question: Is SDR compatible with other composites?
Answer: SDR is chemically compatible with conventional methacrylate based composites.
Question: What is the chemistry of SDR?
Answer: Low stress methacrylate resin with hybrid glass fillers
Question: Is SDR compatible with all adhesives?
Answer: SDR is chemically compatible with methacrylate based adhesives.
Question: What is the diameter of the SDR Compula® Tip?
Answer: 0.6mm inner diameter x 0.9mm outer diameter (20 gauge)
Question: Can SDR be used like most flowables? How does SDR compare to the flowable category?
Answer: SDR material is only indicated for posterior (Class I and Class II) restorations as a
base/liner. Most other flowables on the market are indicated for small Class III’s or I’s and Class V’s as well. It can be applied in increments of up to 4mm.
Question: Will SDR be a separate category of composites?
Answer: No, it will be classified as composite base material for posteriors that provides flow-like consistency. It requires a new filling technique – SDR™ filling technique.
Question: What does SDR stand for?
Answer: Smart dentine replacement
Question: If I incrementally layer my current composite, don’t I compensate for stress?
Answer: The layering technique does compensate for stress to a certain degree. However, even when applying a sophisticated layering technique, methacrylate based composites will produce a significantly higher polymerization stress compared to the SDR material.
Question: I am currently using a flowable composite universally in all cavity classes. Do I have to cover a Class V with a universal after using SDR material?
Answer: SDR material currently is not indicated for Class V indications. It has only been
tested as a posterior bulk fill flowable base for Class I and Class II restorations with the use of a universal composite as a capping agent.
Question: Will SDR material work on air abrasion preps? With the flowable I currently use, I just place it, light cure and I’m finished. Would I have to put another composite on top of SDR to get the hardness? If not, how would the long-term wear compare to my current flowable?
Answer: SDR material is not indicated for air abrasion preps. Just like traditional flowable
composites, they are not indicated for occlusal stress bearing indications and would require another composite be placed on top to provide the strength and wear needed for occlusal areas. In-vitro wear studies have shown that SDR material performs comparably to conventional flowables.
Question: Flowable composites have too much shrinkage and are too weak. Why would I use SDR?
Answer: Shrinkage is not the destructive feature in composites; it’s the stress that is exerted
on the surrounding tooth structure. SDR material has shrinkage in the range of traditional flowable/universal composites, but its stress is 60% less compared to flowables. According to top clinicians and academics, polymerization stress is a leading cause of bond failures, enamel fracture, post-op sensitivity, secondary caries and marginal staining1. Because of the low stress of this material, it can be placed in bulk, up to 4mm increments, which no other flowable on the market can do because of their high stress values, resulting in up to a placement times savings of up to 40% for the doctor.
1Dr. Joe Blaes, Dental Economics: June 2008; JOHN R. CONDON, B.S. and JACK L. FERRACANE, PH.D.J Am Dent Assoc, Vol 131, No 4, 497-503; JL Ferracane, Operative
Question: Amalgam adapts to the prep in the posterior and has no shrinkage. Why would I not use amalgam?
Answer: SDR material offers a time-savings advantage to both the doctor and the patient
and provides an aesthetically pleasing tooth coloured restoration.