Influence of shoulder and chamfer marginal design and type of cement on fracture resistance of zirconia crowns. An in vitro study

Stavreva, Natasa and Pancevska, Sanja and Toshevska Spasovska, Natasa and Mijoska, Aneta and Bajraktarova Valjakova, Emilija and Jovanovski, Saso and Dastevski, Blagoja and Pejkovska Shahpaska, Budima and Zhabokova Bilbilova, Efka (2023) Influence of shoulder and chamfer marginal design and type of cement on fracture resistance of zirconia crowns. An in vitro study. Journal of Hygienic Engineering and Design, 44. pp. 139-143. ISSN 1857- 8489

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Abstract

Abstract
One of the major problems of all-ceramic restorations
is the possibility of their fracture under occlusal force
in posterior region. The aim of the present in vitro
study was to compare the effect of two marginal
designs (shoulder and chamfer) and two types of
cement (phosphate and glass-ionomer) on the fracture
resistance of zirconia crowns.
The stainless steel dies prepared with two different
designs (shoulder and chamfer) were used as
premolars. 20 zirconia copings with a wall thickness of
0.6 mm were fabricated for each type of preparation
and cement. After cementation by two different types
of cement (phosphate and glass ionomer), they were
loaded on Universal Testing Machine until fracture.
Obtained data were analyzed by the Student’s t-test.
The mean values of fracture resistance of copings
cemented with phosphate cement for shoulder and
chamfer preparation were 899 ± 19.7 N and 617.14
± 25.9 N, respectively. The mean values of fracture
resistance of copings cemented with glass-ionomer
cement for shoulder and chamfer preparation were 799
± 31.6 N and 522.43 ± 20.9 N, respectively. Statistical
analysis revealed significant differences between the
groups.
Based on the results of this study, both marginal designs
had sufficient fracture resistance, which are higher than
the physiological masticatory force in posterior region.
Both can be used, but since the fracture resistance of
chamfer preparation is significantly higher than the
shoulder preparation, and the phosphate cemented
copings showed significantly higher resistance than
the glass-ionomer cemented ones within a same type
of preparation, chamfer preparation in combination
with phosphate cement are recommended for zirconia
based restorations from mechanical point of view.
Key words: Zirconia, Tooth preparation, Fracture
resistance, Cement.

Item Type:	Article
Subjects:	Medical and Health Sciences > Basic medicine Medical and Health Sciences > Clinical medicine Medical and Health Sciences > Health biotechnology Medical and Health Sciences > Health sciences Medical and Health Sciences > Other medical sciences
Divisions:	Faculty of Medical Science
Depositing User:	Budima Pejkovska Sahpaska
Date Deposited:	12 Aug 2024 07:03
Last Modified:	12 Aug 2024 07:03
URI:	https://eprints.ugd.edu.mk/id/eprint/32761

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