Thermal dimensional behavior of dental ceramics.

Abstract:

:The aim of this study was to characterize the relation of dimensional changes of dental ceramic materials as function of temperature. The thermal dimensional behavior of one glass ceramic core, four commercially available veneering porcelains and two experimental veneering porcelain materials was determined on cooling from 450 degrees C to 20 degrees C by means of a vertical differential pushrod thermal dilatometer. The thermal dimensional behavior of the ceramic materials was expressed in three different ways: as linear relation with a linear line fitting procedure; as non-linear relation by a quadratic curve fitting procedure and according to ISO 9693 by a thermal expansion coefficient. For all ceramic materials except the one consisting of aluminum oxide fillers, the thermal dimensional behavior is best described with the polynomial function: Deltal/l = C + alpha1T + alpha2T2. The description of the thermal expansion coefficient according to the ISO standard on metal is not appropriate for the prediction of a thermal incompatibility of ceramic materials. Except for Vitadur Alpha, the ceramics materials tested showed non-linear expansion; their thermal dimensional behavior can be best described according to the quadratic relation method, second by the linear relation, third as recommended by ISO.

journal_name

Biomaterials

journal_title

Biomaterials

authors

Isgrò G,Kleverlaan CJ,Wang H,Feilzer AJ

doi

10.1016/j.biomaterials.2003.09.027

keywords:

subject

Has Abstract

pub_date

2004-05-01 00:00:00

pages

2447-53

issue

12

eissn

0142-9612

issn

1878-5905

pii

S0142961203007610

journal_volume

25

pub_type

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