Load-to-fracture Value of Different All-ceramic Crown Systems

Snyder, Mark D.; Hogg, Kyle D.

doi:10.5005/jcdp-6-4-54

Cited by 20 publications

(21 citation statements)

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“…The abutment material, as mentioned above, has a significant influence and increased the fracture load in this study 31,32. Similar fracture loads have been reported with titanium abutments 39. The standard deviation of up to 30% was in the same range or higher compared to similar studies 10,20,30,35.…”

Section: Discussionsupporting

confidence: 86%

In vitroevaluation of fracture strength of zirconia restoration veneered with various ceramic materials

et al. 2012

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PURPOSE Fracture of the veneering material of zirconia restorations frequently occurs in clinical situations. The purpose of this in vitro study was to compare the fracture strengths of zirconia crowns veneered with various ceramic materials by various techniques. MATERIALS AND METHODS A 1.2 mm, 360° chamfer preparation and occlusal reduction of 2 mm were performed on a first mandibular molar, and 45 model dies were fabricated in a titanium alloy by CAD/CAM system. Forty-five zirconia copings were fabricated and divided into three groups. In the first group (LT) zirconia copings were veneered with feldspathic porcelain by the layering technique. In the second group (HT) the glass ceramic was heat-pressed on the zirconia coping, and for the third group (ST) a CAD/CAM-fabricated high-strength anatomically shaped veneering cap was sintered onto the zirconia coping. All crowns were cemented onto their titanium dies with Rely X™ Unicem (3M ESPE) and loaded with a universal testing machine (Instron 5583) until failure. The mean fracture values were compared by an one-way ANOVA and a multiple comparison post-hoc test (α=0.05). Scanning electron microscope was used to investigate the fractured interface. RESULTS Mean fracture load and standard deviation was 4263.8±1110.8 N for Group LT, 5070.8±1016.4 for Group HT and 6242.0±1759.5 N for Group ST. The values of Group ST were significantly higher than those of the other groups. CONCLUSION Zirconia crowns veneered with CAD/CAM generated glass ceramics by the sintering technique are superior to those veneered with feldspathic porcelain by the layering technique or veneered with glass ceramics by the heat-pressing technique in terms of fracture strength.

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Section: Discussionsupporting

confidence: 86%

In vitroevaluation of fracture strength of zirconia restoration veneered with various ceramic materials

et al. 2012

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“…In the current study, 40% of fatigued YZ crowns fractured within the veneering porcelain during the fatigue test, and the remainder had cracks. Zirconium oxide ceramic systems were recently introduced to the marketplace, and the literature is lacking information about the fracture strength of YZ crowns 40–44 . Only one study subjected molar zirconium oxide (Procera AllZirkon, Nobel Biocare, Goteborg, Sweden) crowns to 10,000 mechanical fatigue (30 to 300 N) cycles at 1 Hz 43 .…”

Section: Discussionmentioning

confidence: 99%

Fracture Strength and Fatigue Resistance of All‐Ceramic Molar Crowns Manufactured with CAD/CAM Technology

Zahran

El‐Mowafy

Tam

et al. 2008

Journal of Prosthodontics

123

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“…With an increased demand for esthetics and concerns about toxic and allergic reactions to dental alloys, full coverage allceramic crowns have become very popular with both patients and clinicians because of their highly esthetic results and biocompatibility [1]. However, the fracture resistance of allceramic crowns remains a concern for clinical success [2].…”

Section: Introductionmentioning

confidence: 99%

Influence of the supporting die structures on the fracture strength of all-ceramic materials

et al. 2011

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This study investigated the influence of the elastic modulus of supporting dies on the fracture strengths of all-ceramic materials used in dental crowns. Four different types of supporting die materials (dentin, epoxy resin, brass, and stainless steel) (24 per group) were prepared using a milling machine to simulate a mandibular molar all-ceramic core preparation. A total number of 96 zirconia cores were fabricated using a CAD/CAM system. The specimens were divided into two groups. In the first group, cores were cemented to substructures using a dual-cure resin cement. In the second group, cores were not cemented to the supporting dies. The specimens were loaded using a universal testing machine at a crosshead speed of 0.5 mm/min until fracture occurred. Data were statistically analyzed using two-way analysis of variance and Tukey HSD tests (α = 0.05). The geometric models of cores and supporting die materials were developed using finite element method to obtain the stress distribution of the forces. Cemented groups showed statistically higher fracture strength values than non-cemented groups. While ceramic cores on stainless steel dies showed the highest fracture strength values, ceramic cores on dentin dies showed the lowest fracture strength values among the groups. The elastic modulus of the supporting die structure is a significant factor in determining the fracture resistance of all-ceramic crowns. Using supporting die structures that have a low elastic modulus may be suitable for fracture strength tests, in order to accurately reflect clinical conditions.

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Load-to-fracture Value of Different All-ceramic Crown Systems

Cited by 20 publications

References 1 publication

In vitroevaluation of fracture strength of zirconia restoration veneered with various ceramic materials

In vitroevaluation of fracture strength of zirconia restoration veneered with various ceramic materials

Fracture Strength and Fatigue Resistance of All‐Ceramic Molar Crowns Manufactured with CAD/CAM Technology

Influence of the supporting die structures on the fracture strength of all-ceramic materials

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