ViscoStat Clear vs Astringedent: Hemostatic Comparison
By Ultradent Products, Inc. | Published: 2026-10-19
Category: Comparisons
Compare ViscoStat Clear (aluminum chloride) and Astringedent (ferric sulfate) for gingival retraction and hemostasis. Learn trade-offs in tissue staining, cord placement, and esthetic zone suitability.
Quick answer
Choose ViscoStat Clear when working in the esthetic zone and tissue staining is a concern; choose Astringedent when maximum hemostasis is needed and temporary tissue discoloration is acceptable.
Why hemostatic agent choice matters for gingival retraction
Effective hemostasis during gingival retraction is critical for accurate impressions and clean restorative margins. The two most common chemical agents—aluminum chloride and ferric sulfate—work differently and have distinct trade-offs in tissue response and post-operative appearance.
ViscoStat Clear uses 25% aluminum chloride in a viscous gel that does not temporarily stain tissue, making it ideal for anterior restorations where soft tissue color matters. Astringedent uses 15.5% ferric sulfate, which provides powerful hemostasis but leaves a dark precipitate on tissue that resolves in a few days.
Your choice depends on the tooth location, the retraction technique (cord vs. cordless), and whether the patient will see the treated area immediately after the procedure.
Trade-offs between ViscoStat Clear and Astringedent
- Tissue staining: ViscoStat Clear: no temporary staining. Astringedent: leaves a dark ferric sulfate precipitate that resolves in 2–3 days. Use ViscoStat Clear for anterior teeth or when the patient will see the area immediately.
- Hemostatic strength: Astringedent provides more aggressive clotting, especially in heavy bleeding. ViscoStat Clear is effective for routine gingival sulcus bleeding but may require longer contact time for brisk hemorrhage. Choose Astringedent for posterior teeth or when bleeding is difficult to control.
- Retraction technique compatibility: Both work with cord and cordless techniques. ViscoStat Clear's viscous gel stays in place well without running, while Astringedent's liquid requires careful placement to avoid overflow. ViscoStat Clear is easier to control in confined sulci.
Product facts at a glance
- ViscoStat™ Clear-25% Aluminum Chloride: Aluminum chloride viscous hemostatic will not temporarily stain tissue, ideal for esthetic zone. ViscoStat Clear preserves natural gingival color during and after retraction, so patients in the esthetic zone leave with no visible discoloration.
ViscoStat™ Clear-25% Aluminum Chloride
Which one should you choose?
Best for
- Clinicians working in the esthetic zone (anterior teeth) who want no temporary tissue discoloration
- Practices that frequently use cordless retraction techniques and need a stay-put gel
Not ideal for
- Situations requiring maximum hemostasis in heavy bleeding—consider Astringedent instead
- Posterior restorations where tissue staining is not a concern and stronger clotting is preferred
