نمایش پرونده ساده آیتم

dc.contributor.authorShahrbaf, S
dc.contributor.authorvan Noort, R
dc.contributor.authorMirzakouchaki, B
dc.contributor.authorGhassemieh, E
dc.contributor.authorMartin, N
dc.date.accessioned2018-08-26T07:56:30Z
dc.date.available2018-08-26T07:56:30Z
dc.date.issued2014
dc.identifier.urihttp://dspace.tbzmed.ac.ir:8080/xmlui/handle/123456789/48822
dc.description.abstractObjectives. To determine, by means of static fracture testing the effect of the tooth preparation design and the elastic modulus of the cement on the structural integrity of the cemented machined ceramic crown-tooth complex. Methods. Human maxillary extracted premolar teeth were prepared for all-ceramic crowns using two preparation designs; a standard preparation in accordance with established protocols and a novel design with a flat occlusal design. All-ceramic feldspathic (Vita MK II) crowns were milled for all the preparations using a CAD/CAM system (CEREC-3). The machined allceramic crowns were resin bonded to the tooth structure using one of three cements with different elastic moduli: Super-Bond C&B, Rely X Unicem and Panavia F 2.0. The specimens were subjected to compressive force through a 4 mm diameter steel ball at a crosshead speed of 1 mm/min using a universal test machine (Loyds Instrument Model LRX.). The load at the fracture point was recorded for each specimen in Newtons (N). These values were compared to a control group of unprepared/unrestored teeth. Results. There was a significant difference between the control group, with higher fracture strength, and the cemented samples regardless of the occlusal design and the type of resin cement. There was no significant difference in mean fracture load between the two designs of occlusal preparation using Super-Bond C&B. For the Rely X Unicem and Panavia F 2.0 cements, the proposed preparation design with a flat occlusal morphology provides a system with increased fracture strength. Significance. The proposed novel flat design showed less dependency on the resin cement selection in relation to the fracture strength of the restored tooth. The choice of the cement resin, with respect to its modulus of elasticity, is more important in the anatomic design than in the flat design. (C) 2013 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
dc.language.isoEnglish
dc.relation.ispartofDENTAL MATERIALS
dc.subjectMaxillary premolar
dc.subjectCAD/CAM
dc.subjectVita MK II
dc.subjectAnatomic design
dc.subjectFlat design
dc.subjectElastic modulus
dc.subjectResin luting agent
dc.subjectMechanical test
dc.titleFracture strength of machined ceramic crowns as a function of tooth preparation design and the elastic modulus of the cement
dc.typeArticle
dc.citation.volume30
dc.citation.issue2
dc.citation.spage234
dc.citation.epage241
dc.citation.indexWeb of science
dc.identifier.DOIhttps://doi.org/10.1016/j.dental.2013.11.010


فایلهای درون آیتم

فایلهاسایزفرمتنمایش

هیچ فایل مرتبطی وجود ندارد

این آیتم در مجموعه های زیر مشاهده می شود

نمایش پرونده ساده آیتم