Tauboeck, Tobias T. and Feilzer, Albert J. and Buchalla, Wolfgang and Kleverlaan, Cornelis J. and Krejci, Ivo and Attin, Thomas (2014) Effect of modulated photo-activation on polymerization shrinkage behavior of dental restorative resin composites. EUROPEAN JOURNAL OF ORAL SCIENCES, 122 (4). pp. 293-302. ISSN 0909-8836, 1600-0722
Full text not available from this repository. (Request a copy)Abstract
This study investigated the influence of modulated photo-activation on axial polymerization shrinkage, shrinkage force, and hardening of light-and dual-curing resin-based composites. Three light-curing resin composites (SDR bulk-fill, Esthet X flow, and Esthet X HD) and one dual-curing material (Rebilda DC) were subjected to different irradiation protocols with identical energy density (27 J cm(-2)): high-intensity continuous light (HIC), low-intensity continuous light (LIC), soft-start (SS), and pulse-delay curing (PD). Axial shrinkage and shrinkage force of 1.5-mm-thick specimens were recorded in real time for 15 min using custom-made devices. Knoop hardness was determined at the end of the observation period. Statistical analysis revealed no significant differences among the curing protocols for both Knoop hardness and axial shrinkage, irrespective of the composite material. Pulse-delay curing generated the significantly lowest shrinkage forces within the three light-curing materials SDR bulk-fill, Esthet X flow, and Esthet X HD. High-intensity continuous light created the significantly highest shrinkage forces within Esthet X HD and Rebilda DC, and caused significantly higher forces than LIC within Esthet X flow. In conclusion, both the composite material and the applied curing protocol control shrinkage force formation. Pulse-delay curing decreases shrinkage forces compared with high-intensity continuous irradiation without affecting hardening and axial polymerization shrinkage.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LIGHT-CURING PROTOCOLS; CONTRACTION STRESS; MECHANICAL-PROPERTIES; MARGINAL ADAPTATION; PHYSICAL-PROPERTIES; CURED COMPOSITES; FILLER-FRACTION; GAP FORMATION; CONVERSION; KINETICS; flowable resin composite; polymerization contraction; pulse-delay; shrinkage stress; soft-start |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnerhaltung und Parodontologie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 12 Sep 2019 07:01 |
| Last Modified: | 12 Sep 2019 07:01 |
| URI: | https://pred.uni-regensburg.de/id/eprint/9838 |
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