Predictions of cement microfracture under crowns using 3D-FEA

Journal of Prosthodontics : Official Journal of the American College of Prosthodontists
P KamposioraD A Felton

Abstract

The objective of this research study was to test the effects of (1) crown margin type, (2) cement type, (3) cement thickness, (4) loading direction, and (5) loading magnitude on stress levels and distributions within luting cement that might lead to cement microfracture using three-dimensional Finite Element Analysis techniques. Thirty-two three-dimensional computer models, as well as models for standards, were generated for a mandibular first premolar. Crown preparations exhibited shoulder or chamfer margin configurations, and zinc phosphate, zinc polycarboxylate, glass ionomer, and resin cements were used in thicknesses of 25 or 100 microm. Modeled crowns were loaded axially or obliquely at 10 and 100 MPa. Areas and levels of stress concentrations within the cement were determined. Stresses in the cement were low for all situations except 100 MPa oblique stressing. Stresses at the margins of crowns with chamfer marginal configuration were higher than those with shoulder margins. Stresses under oblique stressing were 10 to 150 times higher than under axial stressing. Except for Zn phosphate cement, cement thickness minimally affected stress levels and distributions. Greater stresses were found in cements with the greater Young...Continue Reading

Citations

Jun 19, 2002·The Journal of Prosthetic Dentistry·Won-Suck Oh, Kenneth J Anusavice
Oct 7, 2008·Dental Materials Journal·Cem KurtogluAmirullah Mamedov
Jan 23, 2016·Dental Materials : Official Publication of the Academy of Dental Materials·Zhongpu ZhangMichael V Swain
Nov 3, 2009·Journal of Prosthodontic Research·Takashi NakamuraHirofumi Yatani
Jun 16, 2009·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·N Gopi Chander, T V Padmanabhan
May 29, 2008·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·E Dianne RekowYu Zhang
Jan 15, 2014·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Timea WimmerFlorian Beuer

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