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-40-everStickPost, MI Core Fiber Post3233 Transmission of Light Through Fiber-reinforced Composite PostsPoster Presentation11:00 AM–12:15 PM Mar 25, 2017CC, First Floor Authors:Authors:Anna-Maria Le Bell-Rönnlöf(Presenter)University of TurkuTimoNärhi, University of TurkuPekkaVallittu, University of TurkuLippoLassila, universtyof turkuAbstract: Objectives: To achieve proper polymerization of fiber-reinforced composite (FRC) post and resin Objectives: To achieve proper polymerization of fiber-reinforced composite (FRC) post and resin lutingcement, good light transmission and scattering is needed. The aim of this in vitro study was to explore light transmission through FRC posts with different polymer matrices. Both prefabricated and individually formed FRC posts were tested. Effect of the length of the FRC post to light-transmission was evaluated. The hypothesis was that different FRC post materials have different light transmission properties.Methods: Five different FRC posts from different manufacturers were tested. Three groups included prefabricated FRC posts with a cross-linked polymer matrix (RelyXFiber Post, GC Fiber Post, FibreKleer4x Fiber Post). Two groups contained FRC posts with a semi-IPN Post, FibreKleer4x Fiber Post). Two groups contained FRC posts with a semi-IPN (interpenetrating polymer network) polymer matrix (everStickPOST, MI Core Fiber Post) one of which consisted of individually formed E-glass FRC posts (everStickPOST). Various lengths of posts were tested: 4, 8 and 10mm (all posts parallel). Three FRC posts of similar length were made (n= 9/post group) and each specimen was tested three times. Light-protected molds of the same lengths as the specimens were made out of putty polyvinylsiloxane. Post preparation was drilled in the putty and posts were placed in the holes. The molds were placed on the test tray of a MARC Resin Calibrator unit and light-polymerized for 10 seconds with EliparS10 (470nm) from a distance of 2mm. Light transmission in the direction of fibers was registered. (470nm) from a distance of 2mm. Light transmission in the direction of fibers was registered. Molds without posts were used as control.Results: The results are presented in the Table.Light transmission decreased with increased post length (p< 0.001; ANOVA) in all post groups. The prefabricated FRC post with a semi-IPN polymer matrix (MI Core Fiber Post) showed highest light transmission in all specimen lengths (p< 0.001).Conclusions: This study shows that a large variation in light transmission exists between different FRC post materials.Table(s):Table(s):Material4810Relyx Fiber Post279.2 ± 1.2A106.9 ± 0.5A49.5 ± 0.4BGC Fiber Post184.2 ± 0.9B68.5 ± 0.4B35.0 ± 0.7BFibreKleer 4x Fiber post94,8 ± 0,4C15.4 ± 0.6C0.0 ± 0.0CeverStick POST165.2 ± 0.9B70.2 ± 0.5B49.9 ± 0.4BMI Core Fiber Post283.6 ± 0.8A122.9 ± 0.9A120.8 ± 0.7APost length (mm)Disclosure Statement:The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONEI have read the IADR policy on licensing.Signed by Anna-Maria Le Bell-RönnlöfControl112.9 ± 0.2C23.8 ± 0.6C14.2 ± 0.4CReprinted with permission from the Journal of Dental Research, J Dent Res 96 (Spec Iss A):-40-Signed by Anna-Maria Le Bell-Rönnlöfabstract number 3233, https://iadr2017.zerista.com/event/member/336391, 2017