Delayed Photo-activation Effects on Mechanical Properties of Dual Cured Resin Cements and Finite Element Analysis of Shrinkage Stresses in Teeth Restored With Ceramic Inlays

Operative Dentistry
Carlos José SoaresA Versluis

Abstract

The aim of this study was to investigate the effect of delayed photo-activation on elastic modulus, Knoop hardness, and post-gel shrinkage of dual cure resin cements and how this affects residual shrinkage stresses in posterior teeth restored with ceramic inlays. Four self-adhesive (RelyX Unicem, 3M ESPE; GCem, GC; MonoCem, Shofu; and seT, SDI) and two conventional (RelyX ARC, 3M ESPE; and AllCem, FGM) dual cure resin cements for cementing posterior ceramic inlays were tested. Strain gauge and indentation tests were used to measure the post-gel shrinkage (Shr), elastic modulus (E), and Knoop hardness (KHN) when photo-activated immediately and 3 and 5 minutes after placement (n=10). Shr, E, and KHN results were analyzed using two-way analysis of variance followed by Tukey honestly significant difference post hoc tests (α=0.05). The experimentally determined properties were applied in a finite element analysis of a leucite ceramic inlay (Empress CAD, Ivoclar Vivadent) cemented in a premolar. Modified von Mises stresses were evaluated at the occlusal margins and cavity floor. Shr, E, and KHN varied significantly among the resin cements (p<0.001). Highest overall Shr values were found for RelyX Unicem; GCem had the lowest. Increasi...Continue Reading

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Citations

Aug 22, 2016·Journal of the Mechanical Behavior of Biomedical Materials·Maryam KhoroushiPouran Samimi
Feb 16, 2017·Journal of Applied Oral Science : Revista FOB·Veridiana Resende NovaisCarlos José Soares
Aug 23, 2018·Journal of Applied Oral Science : Revista FOB·Ana Luíza Serralha de Velloso ViannaCarlos José Soares
Sep 14, 2017·Brazilian Oral Research·Carlos José SoaresAntheunis Versluis
May 22, 2017·Dental Materials : Official Publication of the Academy of Dental Materials·Carla M Ramos-TonelloAna Flávia S Borges
Jul 9, 2020·Dental Materials : Official Publication of the Academy of Dental Materials·André L Faria-E-Silva, Carmem S Pfeifer

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