A comparative study to determine the wettability and castability of different elastomeric impression materials

Dental impressions require precise material properties to ensure accurate restorations. Prior research has shown that the hydrophilic or hydrophobic nature of impression materials affects how well they interact with gypsum during casting. However, no prior work had resolved how different elastomeric materials compare in both wettability and castability. This gap motivated a direct comparison of various materials. Understanding these interactions is essential for minimizing voids in casts. No prior work had resolved the relationship between contact angles and void formation in stone casts. The clinical importance of accurate impressions is well established. Yet, the specific role of material hydrophilicity remains unclear. This study addresses that uncertainty.

This study aimed to compare the wettability and castability of different elastomeric impression materials. The goal was to determine how material hydrophilicity affects gypsum casting outcomes. Researchers focused on polyether, polyvinyl siloxane, and condensation silicone materials. They compared these with polysulfide materials as a reference. The study sought to quantify contact angles and void counts in stone casts. No prior work had resolved how these properties correlate. The motivation was to improve clinical outcomes in prosthodontics. This work addresses a specific gap in material science for dental applications.

Researchers evaluated wettability by measuring contact angles of elastomeric materials. They placed calcium sulfate dihydrate solution on material surfaces. A profile projector captured contact angle measurements. For castability, they made stone casts from impressions of an aluminum die. Voids in the casts were counted using a diopter magnifying lens. Different viscosities of polyvinyl siloxane were tested alongside polyether and silicone. Polysulfide served as a comparative baseline. The study design allowed direct comparisons of wettability and void formation.

Polyether, polyvinyl siloxane, and condensation silicone showed low contact angles. These materials also exhibited fewer voids in stone casts compared to polysulfide. Contact angle measurements correlated significantly with void counts in casts. Materials with lower contact angles produced more accurate stone reproductions. Polysulfide had higher contact angles and more voids in casts. No material showed perfect performance across all metrics. Variability in polyvinyl siloxane viscosity affected outcomes. These findings suggest material hydrophilicity influences casting accuracy.

The study suggests that hydrophilic materials improve gypsum casting accuracy. Lower contact angles correlate with fewer voids in stone casts. Polysulfide materials appear less suitable for precise restorations. Polyether and polyvinyl siloxane may offer better clinical outcomes. Contact angle measurements may serve as a predictive tool for cast quality. No material showed absolute superiority in all aspects. The findings may guide material selection in dental practice. These results may help clinicians choose materials based on wettability and castability.