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Physical and mechanical properties of a strontium silicate-based sealer
Shannon Wong1, Xiaofei Zhu1, Tun-Yi Hsu1
1Department of Endodontics, Boston University Henry M. Goldman School of Dental Medicine, Boston, MA, USA.
Introduction:
This study aimed to evaluate the physical and mechanical properties of an endodontic sealer containing strontium silicates (Sr-Si sealer, C-Root SP, Beijing, China) compared to a calcium silicate-based sealer (Ca-Si sealer, Endosequence BC Sealer, Savannah, USA).
Methods:
Elemental composition of the sealers was confirmed by energy-dispersive X-ray spectroscopy (EDS). Afterwards, particle size was evaluated with SEM (scanning electron microscopy). Flow (n = 10 per group), setting time. (n = 5), film thickness (n = 10), and radiopacity (n = 10) were tested under ISO 6876/2012 standards. To mimic clinical applications, a pressure-flow test (n = 10) was designed and carried out to estimate the forces needed to initiate sealer flow into dentin tubules. A direct observation on sealer penetration depth inside dentin tubule was also performed by SEM with 20 extracted single-canaled teeth, obturated with either Sr-Si or Ca-Si sealer (n = 10 each) using hydraulic condensation technique, resulting in 1080 per sealer group. The data were analyzed with a t test (α = 0.05).
Results:
The Sr-Si sealer contained 10.6 wt% Sr and an average particle size of 1.59 ± 0.97 µm, while the Ca-Si sealer contained 27.0 wt% Ca and a particle size at 8.05 ± 5.66 µm. The Sr-Si sealer also contained 16.2% tantalum which was not found in Ca-Si sealer. In the ISO tests, the Sr-Si sealer showed longer setting time, better flowability, and radiopacity (p < 0.01). The force to initiate the flow in simulated tubules for the Sr-Si sealer was 11.00 ± 0.74 N, significantly lower than the Ca-Si sealer's 21.51 ± 2.59 N. The results were also consistent with the observation on extracted teeth that Sr-Si sealer penetrated further than Ca-Si sealer.
Conclusions:
The properties of the Sr-Si sealer suggest that it possesses desirable characteristics based on current in vitro criteria. While these results provide a strong foundation for its application, conclusions regarding its long-term clinical suitability depend on further clinical trials.
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