Type IV gypsum compatibility with five addition-reaction silicone impression materials

Area of Science:

• Dental Materials Science
• Impression Techniques
• Casting Materials

Background:

• The interaction between addition-reaction silicone impression materials and Type IV gypsum products is not fully understood.
• Ensuring accurate dental impressions is critical for prosthodontic success.

Purpose of the Study:

• To evaluate and compare the surface detail reproduction capabilities of various addition-reaction silicone impression materials when used with different Type IV gypsum products.
• To identify optimal combinations for reliable dental casting procedures.

Main Methods:

• Standardized impressions of a ruled stainless steel die were made using five addition-reaction silicone materials.
• Each impression material was combined with four different Type IV gypsum products.
• Surface detail reproduction, specifically a 20-micrometer line, was assessed at 12x magnification by two independent examiners.

Main Results:

• All tested silicone impression materials successfully reproduced the 20-micrometer line.
• Significant variations in compatibility were observed between different silicone and gypsum combinations.
• Only 25% of the resulting Type IV gypsum casts completely reproduced the 20-micrometer line, with Suprastone accounting for 88% of these successful reproductions.

Conclusions:

• The compatibility between addition-reaction silicone impression materials and Type IV gypsum products is not uniform.
• Suprastone emerged as a highly compatible Type IV gypsum product for achieving fine detail reproduction with the tested silicone materials.