Koch, Angela and Kroeger, Mareike and Hartung, Martin and Manetsberger, Iris and Hiller, Karl-Anton and Schmalz, Gottfried and Friedl, Karl-Heinz (2007) Influence of ceramic translucency on curing efficacy of different light-curing units. JOURNAL OF ADHESIVE DENTISTRY, 9 (5). pp. 449-462. ISSN 1461-5185,
Full text not available from this repository. (Request a copy)Abstract
Purpose: The aim of the study was to examine the influence of dental ceramic translucency under different exposure conditions upon the polymerization rate of a dual-curing composite resin by measuring the depth of cure (DOC) and the Vickers microhardness (VHN). Materials and Methods: Three hundred twenty ceramic specimens (160 Empress 2, Ivoclar Vivadent, color 300, and 160 ProCAD, Ivoclar Vivadent, 300, 114; diameter 4 mm, height 1 mm or 2 mm) were inserted into steel molds and overlayed using a composite resin (Variolink II, Ivoclar Vivadent) with and without a self-curing catalyst. Specimens were cured either in contact with or at a 5-mm distance from a conventional halogen curing light (Elipar TriLight, 3M ESPE, exposure duration 40 s, standard mode) and a light-emitting diode (LED: Bluephase 16i, Ivoclar-Vivadent, exposure duration 20 s, high-power mode), DOC under the ceramic specimen was measured following ISO 4049:2000. The VHN of the resin composite was determined at 0.5 mm and 1.0 mm distance from the ceramic using a Vickers hardness tester. Statistical analysis was performed using the Mann-Whitney U-test (a = 0.05) and the error-rates method (ERM). Results: Higher translucency of the ceramic restoration resulted in higher DOC and VHN values, which were statistically significant for the halogen light source and in most cases for the LED groups. The use of a self-curing catalyst generally produced an increase in DOC and VHN data, with the exception of DOC data for the highly translucent ceramic and direct contact of the tip of the light source with the ceramic. No significant differences between VHN data of the highly translucent ceramic without catalyst and the opaque ceramic with catalyst were observed in 3 out of 4 pairwise comparisons and according to the ERM. Thus, there are indications that for a highly translucent ceramic with the LED unit tested the catalyst may be waived for a ceramic thickness up to 2 mm. Conclusions: There are indications that for a highly translucent ceramic with the LED unit tested, the catalyst may be omitted with a ceramic thickness up to 2 mm. High ceramic translucency improves polymerization of luting composite.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | REMAINING DOUBLE-BONDS; RAMAN-SPECTROSCOPY; EXPOSURE DURATION; DENTAL COMPOSITES; CURED COMPOSITES; DEPTH; RESINS; POLYMERIZATION; CONVERSION; QUANTITY; light curing; LED; ceramic; translucency; depth of cure; Vickers microhardness |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnerhaltung und Parodontologie > Dr. rer. nat. Karl-Anton Hiller |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 01 Dec 2020 09:46 |
| Last Modified: | 01 Dec 2020 09:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/32132 |
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