The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)
- Volume 40 Issue 3
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- Pages.287-295
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- 2002
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- 0301-2875(pISSN)
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- 2005-3789(eISSN)
FRACTURE STRENGTH AND FRACTURE MODE OF RESIN ROOT ANALOGS RESTORED WITH VARIOUS POST AND CORE MATERIALS
- Lee, Byung-Chul (Department of Prosthodontics, Graduate School, Seoul National University) ;
- Han, Jung-Suk (Department of Prosthodontics, Graduate School, Seoul National University) ;
- Lee, Jai-Bong (Department of Prosthodontics, Graduate School, Seoul National University) ;
- Yang, Jae-Ho (Department of Prosthodontics, Graduate School, Seoul National University) ;
- Lee, Sun-Hyung (Department of Prosthodontics, Graduate School, Seoul National University)
- Published : 2002.06.01
Abstract
Statement of Problem. Endodontically treated teeth frequently required posts and cores to provide retention and resistance form for crowns. In spite of excellent mechanical properties of metal post and core, its metallic color can be detected through all ceramic restorations occasionally. To solve esthetic problems of metal post and core zirconia post system has been introduced recently. Purpose. The purpose of this study was to examine the fracture strength and mode of resin root analogs restored with zirconia, gold and titanium posts with resin, ceramic and metal cores after cementation with metal crowns. Materials and methods. To avoid the morphological variations of natural teeth, 40 root analogs were fabricated with composite resin. Forty resin root analogs were randomly assigned to four groups according to post and core materials: Group A: cast gold post and core and complete cast crowns, as control. Group B: titanium posts (Parapost, Coltent/Whaledent Inc., NJ, USA) and composite resin cores. Group C: zirconia posts (Cosmopost, Ivoclar AG, Schaan/Liechtenstein) and composite resin cores Group D: zirconia posts and heat-pressed ceramic cores (IPS Empress Cosmo Ingots, Ivoclar AG) After thermocycling (