Evaluation of Dimensional Changes in Stone Casts from Disinfected Elastomeric Impressions Using Coordinate Measuring...

Area of Science:

• Dental Materials Science
• Prosthodontics
• Infection Control

Background:

• Effective disinfection of elastomeric impression materials is crucial in prosthodontics to prevent cross-contamination.
• Maintaining dimensional accuracy of impressions after disinfection is vital for precise dental restorations.

Purpose of the Study:

• To evaluate the three-dimensional changes in die stone models made from three different elastomeric impression materials after disinfection.
• To compare the dimensional stability of Addition Silicone, Condensation Silicone, and Polyether after treatment with three common disinfectants.

Main Methods:

• 120 impressions were made using Addition Silicone, Condensation Silicone, and Polyether.
• Impressions were disinfected with 5.25% Sodium Hypochlorite, 2% Glutaraldehyde, or 2% Chlorhexidine for 10 minutes.
• Die stone models were poured and measured using a coordinate measuring machine (CMM) to assess dimensional changes.

Main Results:

• Addition Silicone exhibited the highest dimensional accuracy across all tested disinfectants.
• 2% Glutaraldehyde demonstrated superior preservation of dimensional fidelity compared to Sodium Hypochlorite and Chlorhexidine.
• Polyether showed the most significant dimensional variation, particularly in the control group.

Conclusions:

• Disinfection protocols do not adversely affect the dimensional stability of elastomeric impression materials.
• The combination of Addition Silicone and 2% Glutaraldehyde is recommended for optimal dimensional accuracy in prosthodontic applications.
• The hydrophilic nature of Polyether may contribute to its reduced dimensional stability post-disinfection.