What is a disadvantage of silicone impression materials?

Silicone impression materials are widely used due to their excellent properties, including good elasticity and detail reproduction. However, one significant disadvantage is their potential for dimensional instability. This characteristic means that silicone impressions can undergo changes in size or shape over time, especially if they are not stored properly or if they are subjected to changes in temperature or humidity. This dimensional instability can lead to inaccuracies when creating prosthetics or with model casts, as the impressions may not represent the precise anatomy they were intended to capture.

While silicone impressions are generally quick to set and have good accuracy in capturing details, the concern of dimensional changes can affect the final outcome in prosthetic procedures. Cost can also be a factor, but it is generally not cited as a primary disadvantage when considering the specific performance attributes of the material. Understanding this property is essential for dental professionals to ensure the integrity of their restorative work.