Final answer:
Polymerization shrinkage in resin matrix composites can be decreased by incorporating fillers into the resin, using low-shrinkage resin systems, and optimizing polymerization conditions.
Step-by-step explanation:
In resin matrix composites, polymerization shrinkage can be decreased by using certain techniques and materials. One method is to incorporate fillers into the resin matrix. These fillers can help reduce the overall volume change during polymerization, thereby decreasing shrinkage. For example, silica fillers are commonly used in dental composites to minimize shrinkage.
Another approach is to use low-shrinkage resin systems. These resins are specifically formulated to have a lower polymerization shrinkage compared to traditional resin matrices. They typically contain special additives that help control the shrinkage during polymerization.
Additionally, polymerization conditions can be optimized to minimize shrinkage. This can involve controlling factors such as temperature, pressure, and curing time to promote a more controlled and uniform polymerization process, reducing shrinkage.