J Adv Prosthodont.  2015 Dec;7(6):454-459. 10.4047/jap.2015.7.6.454.

Effect of different veneering techniques on the fracture strength of metal and zirconia frameworks

• Turk AG
• Ulusoy M
• Yuce M
• Akin H

• KMID: 2176620
• DOI: http://doi.org/10.4047/jap.2015.7.6.454

Abstract

PURPOSE
To determine whether the fracture strengths and failure types differed between metal and zirconia frameworks veneered with pressable or layering ceramics.
MATERIALS AND METHODS
A phantom molar tooth was prepared and duplicated in 40 cobalt-chromium abutments. Twenty metal (IPS d.SIGN 15, Ivoclar, Vivadent, Schaan, Liechtenstein) and 20 zirconia (IPS e.max ZirCAD, Ivoclar) frameworks were fabricated on the abutments. Each framework group was randomly divided into 2 subgroups according to the veneering material: pressable and layering ceramics (n=10). Forty molar crowns were fabricated, cemented onto the corresponding abutments and then thermocycled (5-55degrees C, 10,000 cycles). A load was applied in a universal testing machine until a fracture occurred on the crowns. In addition, failure types were examined using a stereomicroscope. Fracture load data were analyzed using one-way ANOVA and Tukey HSD post-hoc tests at a significance level of 0.05.
RESULTS
The highest strength value was seen in metal-pressable (MP) group, whereas zirconia-pressable (ZP) group exhibited the lowest one. Moreover, group MP showed significantly higher fracture loads than group ZP (P=.015) and zirconia-layering (ZL) (P=.038) group. No significant difference in fracture strength was detected between groups MP and ML, and groups ZP and ZL (P>.05). Predominant fracture types were cohesive for metal groups and adhesive for zirconia groups.
CONCLUSION
Fracture strength of a restoration with a metal or a zirconia framework was independent of the veneering techniques. However, the pressing technique over metal frameworks resisted significantly higher fracture loads than zirconia frameworks.

Keyword

Dental porcelain; Zirconia; Crowns; Compressive strength

MeSH Terms

Adhesives
Ceramics
Compressive Strength
Crowns
Dental Porcelain
Molar
Tooth
Adhesives
Ceramics
Dental Porcelain

Figure

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  Fig. 1 Metal and zirconia based ceramic specimens before cementation.

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  Fig. 2 Load was applied on each crown using a spherical indenter with an ethylen-vinyl acetate foil.

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  Fig. 3 Stereomicroscope images of fractured metal group, (A) lingual view of MP specimen and (B) fractured segment (cohesive within metal), (C) lingual view of ML specimen and (D) fractured part (cohesive within metal).

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  Fig. 4 Stereomicroscope images of fractured zirconia group, (A) lingual view of ZP specimen and (B) fractured segments (cohesive within ceramic), (C) lingual view of ZL specimen and (D) fractured parts (adhesive).

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