Influence of light irradiation on Vickers hardness of dual-cure cement polymerized under restorations

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This study evaluated the influence of the light transmittance of restoratives materials, the distance from the light irradiationarea, and the lapsed time after light irradiation on the degree of polymerization of dual-cure cement (Panavia F2.0) which is placed to the area covered with restoratives by measuring Vickers micro hardness (Hv). Within the limitations of this study, the following conclusionswere drawn:1. Application of the self-etching primer also improved the polymerization of dual-cure cement in areas covered by the restoration.2. When installing a restoration to the abutment tooth using dual-cure resin cement in a clinical practice, an additional light irradiation to the marginal area is preferable to accelerate the polymerization of the cement.3. It is highly recommended to keep to a minimum stresses on the bonding interface the day that a prosthetic restoration is installed.