Abstract: The shrinkage of composite restorations upon polymerization may lead to clinical failures and adverse consequences. Microcomputed tomography (microCT) can be used to measure the volume change before and after polymerization of the resin and the resulting microleakage; on the other hand, shrinkage vector can be calculated through tracing particles. This method is nondestructive, threedimensional visual, more accurate, and more scientific. This article reviewed the technology.

Key words: resin composite, polymerization shrinkage, micro CT