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What is  flexural modulus and what is flexural strength?

Acta Odontol Scand. 2003 Apr;61(2):87-92. Related Articles, Links

Flexural strength and modulus of a novel ceramic restorative cement
intended for posterior restorations as determined by a three-point
bending test.

Sunnegardh-Gronberg K, Peutzfeldt A, van Dijken JW.

Department of Odontology, University of Umea, Umea, Sweden.
Karin.Sunnegardh@odont.umu.se

The aim of this study was to compare a new restorative cement intended
for posterior restorations, Doxadent, with other types of tooth-colored
materials as regards flexural strength and flexural modulus. The new
restorative material consists mainly of calcium aluminate. Four hybrid
resin composites, one polyacid-modified resin composite, one
resin-modified glass ionomer cement, one conventional glass ionomer
cement, one zinc phosphate cement, and an experimental version as well
as the marketed version of Doxadent were investigated. Flexural
strength and flexural modulus were tested according to ISO standard
4049 and determined after 1 d, 1 week, and 2 weeks. Together with the
zinc phosphate cement, Doxadent had the lowest flexural strengths
(13-22 MPa). The strongest materials were the resin composites and the
polyacid-modified resin composite (83-136 MPa). The highest flexural
modulus was found for Doxadent (17-19 GPa). The flexural strength of
Doxadent decreased significantly from 1 week to 2 weeks, while flexural
modulus remained unchanged. The other materials reacted in different
ways to prolonged water storage. It can be concluded that the
restorative cement Doxadent had significantly lower flexural strength
and significantly higher flexural modulus than today's materials used
for direct posterior restorations.

PMID: 12790505 [PubMed - indexed for MEDLINE]

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