The effect of cement thickness on the fracture strength of all-ceramic crowns.

Abstract:

:The effect of increasing cement thickness on the fracture strength of aluminous porcelain jacket crowns was investigated in this study. Thirty-three aluminous porcelain jacket crowns were divided into three groups. In Group 1, only platinum foil was used to provide cement space. In Group 2 two layers and Group 3 four layers of die spacer were painted onto the metal die before impression taking. Each crown was cemented onto a metal die with zinc phosphate cement and loaded until fracture. The maximum force to break each crown was recorded. The average fracture load was 408 N for Group 1,365 N for Group 2 and 324 N for Group 3. ANOVA (SPSS) found a significant difference (p < 0.05) between groups. A Scheffe Test revealed a significant difference between Groups 1 and 3. It was concluded that increasing the cement thickness above 70 microns reduced the fracture strength of porcelain jacket crowns.

journal_name

Aust Dent J

authors

Tuntiprawon M,Wilson PR

doi

10.1111/j.1834-7819.1995.tb05607.x

subject

Has Abstract

pub_date

1995-02-01 00:00:00

pages

17-21

issue

1

eissn

0045-0421

issn

1834-7819

journal_volume

40

pub_type

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