Polymerization shrinkage and porosity profile of dual cure dental resin cements with different adhesion to dentin mechanisms |
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Authors: | Adrieli Burey Paulo José dos Reis Bruno Luiz Santana Vicentin Cássia Cilene Dezan Garbelini Márcio Grama Hoeppner Carlos Roberto Appoloni |
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Affiliation: | 1. Student of the Master Degree Program in Odontology at Universidade Estadual de Londrina – UEL, Londrina, Paraná, Brasil;2. Department of Physics, State University of Central West – UNICENTRO, Guarapuava, Paraná, Brasil;3. Department of Physics, State University of Londrina – UEL, Londrina, Paraná, Brasi;4. Department of Oral Medicine and Infant Odontology, State University of Londrina – UEL, Londrina, Paraná, Brasil;5. Department of Restorative Odontology, State University of Londrina – UEL, Londrina, Paraná, Brasil;6. Department of Physics, State University of Londrina – UEL, Londrina, Paraná, Brasil |
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Abstract: | This research aims to probe the porosity profile and polymerization shrinkage of two different dual cure resin cements with different dentin bonding systems. The self‐adhesive resin cement RelyX U200 (named RU) and the conventional Allcem Core (named AC) were analyzed by x‐ray microtomography (μCT) and Scanning Electron Microscopy (SEM). Each cement was divided into two groups (n = 5): dual‐cured (RUD and ACD) and self‐cured (RUC and ACC). μCT demonstrated that the method of polymerization does not influence the porosity profile but the polymerization shrinkage. Fewer concentration of pores was observed for the conventional resin cement (AC), independently the method used for curing the sample. In addition, SEM showed that AC has more uniform surface and smaller particle size. The method of polymerization influenced the polymerization shrinkage, since no contraction for both RUC and ACC was observed, in contrast with results from dual‐cured samples. For RUD and ACD the polymerization shrinkage was greater in the lower third of the sample and minor in the upper third. This mechanical behavior is attributed to the polymerization toward the light. µCT showed to be a reliable technique to probe porosity and contraction due to polymerization of dental cements. |
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Keywords: | dental composite photo‐cure polymerization contraction self‐cure X‐ray microtomography |
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