TTP-3 - To The Point Lecture: Assessment of the Physical and Mechanical Properties of a Strontium Silicate-Based Endodontic Sealer

Newly developed silicate-based bioceramic sealers have demonstrated superior volume stability and bioactivity, leading to increased acceptance among general dentists and endodontists. Recently, a novel pre-mixed, injectable strontium silicate-based (Sr-Si) bioceramic sealer received FDA approval. Strontium is known for its osteogenic potential and favorable biocompatibility. While initial studies have confirmed the low cytotoxicity and excellent biocompatibility of this Sr-Si sealer, comprehensive assessments of its physical and mechanical properties, particularly regarding dentin tubule penetration, have not yet been reported.

In this study, the elemental composition of the Sr-Si sealer was analyzed using energy dispersive X-ray spectroscopy (EDS), and particle size was characterized via scanning electron microscopy (SEM). Additionally, critical parameters including flowability, setting time, film thickness, and radiopacity were evaluated according to ISO 6876/2012 standards. Dentin tubule penetration was investigated utilizing a custom-designed apparatus and extracted tooth model. Results demonstrated that the Sr-Si sealer exhibited superior performance in terms of flowability, radiopacity, and dentin tubule penetration. These findings strongly support the clinical application and potential advantages of the Sr-Si sealer in endodontic practice.