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SureFil SDR flow Material Outperforms Competing Bulk-Fill Composites

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Posted: September 16, 2016
Edited by Dentaltown staff

YORK, Penn.—Compared to traditional layered fill techniques, composites designed for bulk-filling can significantly reduce the time and effort for performing Class I and Class II restorations.

However, many dentists have been concerned that the bulk-fill technique may lead to premature failure of the restoration due to inadequate bonding at the cavity floor or excess material shrinkage.

A recently published study* shows that these concerns are unfounded when SureFil SDR flow material is used to bulk-fill restorations up to 4mm deep. The peer-reviewed study found that the material delivered the highest light irradiance at the cavity floor and significantly less polymerization stress compared to other leading bulk-fill composites. Dentists can expect a fully cured bond and minimal shrinkage for a stronger, longer-lasting restoration, even with high C- factor cavities.

The study design

The study, “Effect of Bulk-Filling on the Bonding Efficacy in Occlusal Class I Cavities,” was published in the Journal of Adhesive Dentistry 2016, 18:119–24. Authors include A. Van Ende, J. De Munck, K. Van Landuyt and B. Van Meerbeek. The study compared four composites:

• Filtek Z100 (3M Espe), a conventional light-curing composite
• Filtek Bulk Fill Flowable (3M Espe)
• Tetric EvoCeram Bulk Fill (Ivoclar Vivadent)
• SureFil SDR flow Bulk Fill Flowable (Dentsply Sirona)

These materials were bulk-filled into 4mm deep Class I cavities. To provide a baseline for evaluating the relative strength of these restorations, the materials were also built up in bulk on flat dentin surfaces using molds that reproduced the dimensions of a Class I cavity. All materials were bonded to the dentin using the same adhesive.

Additional samples were prepared to measure the curing-light irradiance at the bottom of each composite fill using a spectrometer.

The samples were stored in water for one week, then sliced into microspecimens and tested for microtensile bond strength (µTBS). Fracture surfaces were analyzed using conventional light microscopy, and representative samples were further examined using scanning electron microscopy.

The results

When built up on flat dentin surfaces, the tested materials exhibited no significant differences in µTBS, and no pre-test failures occurred.

However, all the composites except SureFil SDR flow material showed a large decrease in µTBS when actual Class I cavities were bulk-filled, indicating significant polymerization stress resulting in material shrinkage.

Unlike competing composites, SureFil SDR flow material retains exceptional bond strength when bulk-filled into cavities, similar to the strength it exhibits when bonded to a flat dentin surface under ideal laboratory conditions. This advantage is reflected in the correlation between µTBS results and actual failure rates. Pre-test failure rates were 100 percent for the Filtek Z100 samples and more than 70 percent for both Filtek Bulk Fill Flowable and Tetric EvoCeram Bulk Fill. SureFil SDR flow+ material showed no pre-test failures.

Additionally, the highest curing-light irradiance at the cavity floor was measured for SureFil SDR flow material, indicating the greatest likelihood of achieving a fully cured bond at this crucial interface. Light irradiance was lower for the other bulk-fill composites and lowest for the conventional layered-fill composite Filtek Z100.

SureFil SDR flow+ material offers even greater versatility

When SureFil SDR flow was launched in 2009, it introduced a new way of placing Class I and II restorations.

Its highly flowable consistency provides excellent cavity adaptation, even in the deepest corners of the proximal box. Its self-leveling property, requiring no further manipulation, provides an optimum base for the final occlusal layer and simplifies placement even on maxillary posterior teeth. And the SDR chemistry provides up to 60 percent less polymerization stress compared to other flowable and universal composites—including other bulk-fill materials—allowing layers up to 4mm thick even in high C-factor cavities.

Now, the new SureFil SDR flow+ material offers even greater versatility, with additional A1, A2 and A3 shades in addition to the original universal shade, greater wear resistance and radiopacity, and approval for use in a wider range of cases beyond Class I and II. It’s an essential component of the Class II Total Practice Solution from Dentsply Sirona, delivering more efficient procedures and reliable clinical outcomes for a more effective dental practice.

For more information, visit dentsplysirona.com.

*Van Ende A et al., 2016: Effect of Bulk-filling on the Bonding Efficacy in Occlusal Class I Cavities. J Adhes Dent.;18(2):119-24
 
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