Evaluation of dimensional stability of autoclavable elastomeric impression material

Area of Science:

• Dental materials science
• Infection control in dentistry
• Sterilization techniques

Background:

• Dental impressions are critical for prosthodontic restorations and can transmit infections.
• Proper disinfection and sterilization of impressions are vital for laboratory safety.
• Elastomeric impression materials require evaluation for dimensional stability after sterilization.

Purpose of the Study:

• To assess the dimensional stability of polyvinyl siloxane (Affinis) elastomeric impression material after autoclaving.
• To determine the optimal waiting period before casting autoclavable impression materials.

Main Methods:

• Standardized stainless steel dies were used to fabricate 40 polyvinyl siloxane impressions (light body and putty).
• Impressions were autoclaved, and dimensional changes were measured using a measuring microscope immediately and 24 hours post-autoclaving.
• Statistical analysis was performed to evaluate dimensional stability across different time points.

Main Results:

• No statistically significant difference in mean dimensional change was observed between the three measurement groups (P > 0.05).
• A higher mean dimensional change was noted immediately after autoclaving compared to 24 hours post-autoclaving.
• The dimensional stability improved by the 24-hour mark post-autoclaving.

Conclusions:

• Autoclaving is an effective sterilization method for elastomeric impression materials.
• A 24-hour delay before casting autoclavable elastomeric impressions is recommended to ensure optimal dimensional stability.
• This study supports autoclaving as a viable sterilization protocol in dental laboratories, enhancing patient and staff safety.