Dynamic measurement of local displacements within curing resin-based dental composite using optical coherence elastography.

This study aimed to determine the feasibility of using optical coherence elastography to measure internal displacements during the curing phase of a light-activated, resin-based composite material. Displacement vectors were spatially mapped over time within a commercial dental composite. Measurements revealed that the orientation of cure-induced displacement vectors varied spatially in a complex manner; however, each vector showed a systematic evolution with time. Precision of individual displacements was estimated to be ∼1 ∼1 to 2  μm 2  μm , enabling submicrometer time-varying displacements to be detected.