Fatigue resistance of simplified CAD–CAM restorations: Foundation material and ceramic thickness effects on the fatigue behavior of partially- and fully-stabilized zirconia

Machry, Renan Vaz; Cadore-Rodrigues, Ana Carolina; Borges, Alexandre Luiz Souto; Pereira, Gabriel Kalil Rocha; Kleverlaan, Cornelis J.; Venturini, Andressa Borin; Valandro, Luiz Felipe

doi:10.1016/j.dental.2021.01.001

Cited by 21 publications

(12 citation statements)

References 27 publications

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“…The results of the study are similar to a previous study. A study by Machry et al [ 12 ] bonded 0.7 mm and 1.0 mm 3 mol% yttria-stabilized zirconia discs to 2 mm discs of epoxy resin (modulus = 14.9 GPa) and composite resin (11 GPa). The discs were cyclically step-loaded against a stainless steel, spherical piston.…”

Section: Discussionmentioning

confidence: 99%

“…In the study by Machry et al [ 12 ], flat specimens of zirconia were loaded perpendicular to their surface by a round ball. In this configuration, the mismatch in elastic modulus between the zirconia and substructure resins indicates that the substructure may undergo more strain than the zirconia under a given load [ 8 ].…”

Section: Discussionmentioning

confidence: 99%

“…Some materials may bond better to their substructure die, which more efficiently allows stress transfer [ 11 ]. Also, the different mismatch in elastic modulus between the crown and the substructure die may allow some materials to fare better than others [ 12 ]. Previous studies have reported that rankings of materials with crown fracture load testing do not correlate with flexural strength testing [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have compared the effect of die material in static and cyclic load testing. Generally, ceramic crowns fractured at a lower load on resin composite dies than on metal dies [ 12 , 14 , 15 , 16 ]. A study comparing the fracture strength of zirconia crowns reported that crowns fractured on resin dies produced a similar strength as enamel dies, whereas metal dies produced a significantly higher strength [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Die Material on the Crown Fracture Strength of Zirconia Crowns

Sayed Ahmed,

Lawson,

et al. 2024

Materials

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Background: Determination of the eligibility of several tooth analog materials for use in crown fracture testing. Methods: A standardized premolar crown preparation was replicated into three types of resin dies (C&B, low modulus 3D printed resin; OnX, high modulus 3D printed resin composite; and highest modulus milled resin composite). 0.8 mm zirconia crowns were bonded to the dies and the maximum fracture load of the crowns was tested. Twelve extracted human premolars were prepared to a standardized crown preparation, and duplicate dies of the prepared teeth were 3D printed out of C&B. Zirconia crowns were bonded to both the dies and natural teeth, and their fracture load was tested. Results: There was no statistical difference between the fracture load of zirconia crowns bonded to standardized dies of C&B (1084.5 ± 134.2 N), OnX (1112.7 ± 109.8 N) or Lava Ultimate (1137.5 ± 88.7 N) (p = 0.580). There was no statistical difference between the fracture load of crowns bonded to dentin dies (1313 ± 240 N) and a 3D-printed resin die (C&B, 1156 ± 163 N) (p = 0.618). Conclusions: There was no difference in the static fracture load of zirconia crowns bonded to standardized resin dies with different moduli or between a low modulus resin die and natural dentin die.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of Die Material on the Crown Fracture Strength of Zirconia Crowns

Sayed Ahmed,

Lawson,

et al. 2024

Materials

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“…Previous studies have reported high survival rates for 3Y-TZP-based restorations with minimal thickness at the occlusal surface [24][25][26][27][28][29][30][31][32]. Nevertheless, there is scarce information about the effect of thickness on the performance of thirdgeneration zirconia restorations [33,34]. One in vitro study [35] reported a better performance for crowns made of third-generation zirconia compared to lithium disilicate and zirconia-lithium silicate, although the crown thickness was restricted to 1.5 mm for all studied systems, which warrants further research on restorations with reduced thickness.…”

Section: Introductionmentioning

confidence: 99%

Fatigue failure of lithium disilicate and translucent zirconia crowns with different occlusal thicknesses

Adabo

Longhini

Baldochi

et al. 2022

Preprint

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Objectives: To assess the probability of survival of crowns made of high translucent 3rd generation zirconia (Prettau Anterior - PA), 2nd generation zirconia (Prettau - P), and the glass-ceramic lithium disilicate (IPS e.max CAD - EM). Materials and Methods: CAD-CAM premolar crowns were fabricated with occlusal thicknesses of 1.0 mm or 1.5 mm and cemented on a metal dye. Step-stress accelerated life testing (SSALT) was performed using 3 profiles: mild (n=9), moderate (n=6), and aggressive (n=3). The use-level probability Weibull curves and reliability were calculated for completion of a mission of 100,000 cycles at 300, 600, 900, and 1200 N. Results: A high probability of survival was found for all ceramics (87-99%) at 300 N, irrespective of thickness. There was no significant decrease in the probability of survival for all P crowns up to 1200 N (83-96%). EM crowns presented lower reliability than P or PA crowns under the 600-900 N mission. PA crowns showed lower reliability than P crowns at higher loads of 1200 N. There was no significant difference in the Weibull modulus (3.23-7.12). P demonstrated the highest characteristic strength (2483-2972 N), followed by PA (1512-1547 N) and EM (971-1154 N). Conclusion: High translucent 3rd generation zirconia has a high probability of survival (up to 900 N-load), while lithium disilicate survives up to 300 N load only, irrespective of thickness (1.0 mm or 1.5 mm). Clinical Relevance: The probability of survival of posterior crowns made with zirconia ceramics has sufficient strength for parafunctional loads, while glass ceramics resist normal chewing loads only.

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