アブストラクト（33巻2号：The Bulletin of Kanagawa Dental College）

The Bulletin of Kanagawa Dental College

English

Title　： Fracture Resistances of Composite Veneered Ceramic Crowns
Subtitle　： ORIGINAL ARTICLES
Authors　： Satoshi Ino1), Albert Mehl2), Reinhard Hickel2), Tadahiro Fujita3), Minoru Toyoda1)
Authors（kana）　：
Organization　： 1)Division of Prosthetics, Department of Oral and Maxillofacial Rehabilitation, Kanagawa Dental College, 2)Department of Restorative Dentistry, Ludwig Maximilians University, 3)Institute for Frontier Oral Science, Kanagawa Dental College
Journal　： The Bulletin of Kanagawa Dental College
Volume　： 33
Number　： 2
Page　： 45-49
Year/Month　： 2005 / 9
Article　： Original article
Publisher　： Kanagawa Odontological Society
Abstract　： [Abstract] The aim of this study is to investigate the fracture behavior of composite veneered ceramic crowns (ICCV), and to compare these to the results of all-composite crowns (Estenia) (EST) and all-ceramic crowns (Vita Mark II) (M II). Sixty crowns were made for a standardized upper 1st molar crown preparation. All twenty EST and M II crowns were manufactured using a CAD / CAM system (Cerec 2). Twenty ceramic core frames were milled from alumina blocks using Cerec 2, and the final shape was accomplished by placing a veneer of the composite (Estenia) for ICCV. All crowns were cemented onto their dies with either adhesive (Panavia 21, Kuraray) or non-adhesive cement (Ketac-Cem, 3M-Espe), and were subjected to a cyclically applied pre-load (50,000 cycles, 200N, 1Hz). Subsequently, measurements of the fracture strengths were taken with a testing machine (0.1 mm/min). ICCV and EST showed a significantly higher fracture resistance than M II. Where adhesive cement was used on ICCV and EST, the results were significantly higher (p>0.01) than those obtained with non-adhesive cement. However, there was no-significant difference between adhesive and non-adhesive cement in the case of M II. The ceramic core coping of all the composite veneered ceramic crowns was observed to remain intact but the veneered composites were fractured. In the case of cementation with adhesive cement, EST and M II exhibited complete fractures in both crowns and preparation dies. However, using non-adhesive cement, only the crowns were fractured. According to the results of this study, it is recommended that adhesive cement should be used with composite veneered ceramic crowns, because of their hyper integration to abutment teeth.
Practice　： Dentistry
Keywords　： CAD, CAM, Composite, Ceramics, Fracture resistance, Adhensive cement