Contemporary Materials I−1 (2010)

Contemporary Materials, I–1 (2010)     Page 105 - 111

HOLOGRAPHIC INTERFEROMETRY AS A METHOD FOR MEASURING STRAIN CAUSED BY POLYMERIZATION SHRINKAGE OF DENTAL COMPOSITE

T. Puškar¹, D. Jevremović², L. Blažić¹, D. Vasiljević³, D. Pantelić³, B. Murić³, B. Trifković⁴

Ab­stract

Polyme­ri­za­tion shrin­ka­ge is one of the most cri­ti­cal pro­per­ti­es of est­he­tic resin-ba­sed den­tal re­sto­ra­ti­ve ma­te­ri­als and may ha­ve a ne­ga­ti­ve im­pact on the­ir cli­ni­cal per­for­man­ce. As the com­po­si­te is ad­he­si­vely bon­ded, con­trac­tion of com­po­si­te ma­te­rial that oc­curs du­ring the polyme­ri­za­tion ca­u­ses stress and strain of hard den­tal tis­su­es. Polyme­ri­za­tion shrin­ka­ge al­so af­fects the ma­in­te­nan­ce of the bon­ded in­ter­fa­ce bet­we­en the com­po­si­te re­sin and den­tal hard tis­su­es. The aim of this study is to pre­sent holographic in­ter­fe­ro­me­try as a met­hod for de­tec­ting and me­a­su­ring strain of den­tal hard tis­sue ca­u­sed by the polyme­ri­za­tion shrin­ka­ge of the den­tal com­po­si­te. Ma­te­ri­als and met­hods: Strain was me­a­su­red ex­pe­ri­men­tally, by real ti­me ho­lo­grap­hic in­ter­fe­ro­me­try, on the ma­xil­lary te­eth. Strain of den­tal tis­sue was de­ter­mi­ned by co­un­ting the interferomen­tic frin­ges that ap­pe­a­red du­ring the polyme­ri­za­tion pro­cess. Re­sults: The defor­ma­tion was re­cor­ded on the co­ro­nal den­tal tis­sue from 2.25 µm to 5.8 µm. The conclu­sion is that ho­lo­grap­hic in­ter­fe­ro­me­try is a non-con­tact, non-de­struc­ti­ve, very preci­se met­hod for me­a­su­ring de­for­ma­tion of hard den­tal tis­su­es that is ca­u­sed by the polyme­ri­za­tion shrin­ka­ge of den­tal com­po­si­te.  

Keywords: Resin based composites, polymerization shrinkage, holographic inter­ferometry.

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