Holographic Measurement of Dental Tissue Contraction and Stress due to Postpolymerization Reaction

Abstract

Polymerization contraction of dental photo-polymer composites induces internal stress, in a tooth cavity. This stress is measured indirectly by, first, holographic determination of tooth deformation, with consequent calculation of stress using finite element method. Real time holographic technique enabled observation of dental deformation in all stages of polymerization. Specially constructed blue-LED light source was used to polymerize photopolymer composite. We have found that polymerization continues even after illumination is over. Consequently, stress is increased, too.

Novel biophotonics-based techniques in dental medicine - a literature review

“…In general, photo-mechanics is a scientific discipline that uses optical methods for studying the mechanical response of various structures under an impact of load [20][21][22]. It includes several non-destructive, highly sensitive (submicron range) techniques such as digital holographic interferometry (DHI), photo-elasticity, digital image correlation, and Moiré interferometry that can provide full-field stress and strain information of specimens in situ [23].…”

Digital image correlation analysis of biomaterials

“…3D analysis of surface deformations, e.g. vibrational spectroscopy [1], real time holographic technique [2], can lead to better understanding of mechanical properties of biomaterials, and complement other contemporary means of analysis. Measuring systems consider the real component geometry which wouldn't be possible with traditional measuring devices such as strain gauges, displacement sensors (LVDT), vibrometers, etc.…”

“…More techniques and holographic interferometry (ESPI) from theoretical perspective [2,3] have been thoroughly described as well as the application engineering viewpoint [4].…”