Adhesion of restorations to impression materials

Area of Science:

• Dental Materials Science
• Restorative Dentistry
• Impression Techniques

Background:

• Accurate dental impressions are crucial for successful restorative procedures.
• The interaction between impression materials and restorative materials can affect impression retention.
• Understanding this interaction is key to optimizing clinical workflows and prosthetic fit.

Purpose of the Study:

• To evaluate the retention of three impression materials (Impregum, Permadyne, Reprosil) with three restorative materials (Lodestar, Dispersalloy, Concise).
• To determine the influence of restorative material type and sample design (with/without collar) on impression retention.
• To assess the potential for bonding between impression and restorative materials.

Main Methods:

• Polished cylindrical samples of restorative materials (metal and resin composite) with and without a collar design were prepared.
• Samples were submerged in each of the three impression materials until set.
• A pullout test using an Instron machine quantified the resistance to impression removal.

Main Results:

• Lodestar and Dispersalloy (metal) showed similar retention behavior, irrespective of the collar design.
• Permadyne and Impregum exhibited significantly higher retention with resin composite (Concise) compared to Reprosil.
• Resin composite demonstrated significantly greater retention than the metallic restorative materials.

Conclusions:

• A significant bond can form between certain impression and restorative materials, increasing removal resistance.
• Permadyne and Impregum are more retentive with resin composites than Reprosil.
• Material selection is critical, as the interaction can impact the ease of impression removal in clinical practice.