Effect of Shoulder and Chamfer Marginal Design on Fracture Resistance of Zircona Crowns. an in Vitro Study

Stavreva, Natasa and Toseska Spasova, Natasa and Radojkova-Nikolovska, Vera and Bajraktarova Valjakova, Emilija and Mijoska, Aneta and Dastevski, Blagoja and Janeva, Nadiva and Nikolovski, Bruno and Trpevska, Vesna (2024) Effect of Shoulder and Chamfer Marginal Design on Fracture Resistance of Zircona Crowns. an in Vitro Study. In: International Dental Congress - Dental Naissa'24, 5-7 Apr 2024, University of Nis.

	Text UTICAJ PREPARACIJE SA PRAVOUGAONOM I OLUKOVIDNOM-abstract.pdf - Published Version Download (1MB)
	Slideshow EFFECT OF SHOULDER AND CHAMFER MARGINAL DESIGN ON FRACTURE.pdf - Published Version Download (194kB)

Abstract

Introduction: One of the major problems of all-ceramic restorations is their probable
fracture under occlusal force in posterior region.
Aim: The aim of the present in vitro study was to compare the effect of two marginal
designs (shoulder and chamfer) on the fracture resistance of zirconia core restorations.
Material and methods: 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. After cementation
by glass ionomer cement, they were loaded on Universal Testing Machine until
fracture.
Results: In this cross-sectional study the mean values of fracture resistance for
chamfer and shoulder preparation were 888.9 ± 84.3 N and 624.2 ± 116.3 N,
respectively. Student’s t-test revealed statistically significant differences between the
groups.
Conclusion: Based on the results of this study, both marginal designs had high
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, it is recommended
as a marginal design for zirconia based restorations from both mechanical and
periodontal point of view.

Item Type:	Conference or Workshop Item (Poster)
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:	Vesna Trpevska
Date Deposited:	04 Oct 2024 12:35
Last Modified:	04 Oct 2024 12:35
URI:	https://eprints.ugd.edu.mk/id/eprint/34773

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