Durability and Weibull Characteristics of Lithium Disilicate Crowns Bonded on Abutments with Knife‐Edge and Large Chamfer Finish Lines after Cyclic Loading

Cortellini, Davide; Canale, Angelo; Souza, Rodrigo Othávio de Assunção e; Campos, Fernanda; Lima, Julia C.; Özcan, Mutlu

doi:10.1111/jopr.12237

Cited by 20 publications

(22 citation statements)

References 17 publications

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“…The fracture strength results obtained in this study ranged between 3302 and 3754 N, comparable to a previous report on monolithic CAD/CAM crowns (3237 N) . In another study, after fatigue conditions, the results decreased almost twofold ranging between 1618 and 1655 N, and 1719 N . All frameworks were made of lithium disilicate, having higher elasticity modulus (95 ± 5 GPa) compared to the veneering ceramic (68 GPa) .…”

Section: Discussionsupporting

confidence: 83%

“…These values are well above the moduli obtained for natural teeth when they are tested under static axial ( m = 3.8) or lateral loading ( m = 4.6) . The results of this study are slightly higher than those of a previous study where lithium disilicate crowns with knife edge ( m = 5.48) and light chamfer type ( m = 7.68) were tested on molars after subjecting the crowns to 1,200,000 cycles . One of the main causes of structural failure in dental reconstructions is the consequence of fatigue due to repeated stresses.…”

Section: Discussionmentioning

confidence: 45%

“…The fractographic analysis of monolithic specimens, either CAD/CAM milled or thermopressed, showed a dominant radial crack pattern, starting from the loading area. This failure mode has also been demonstrated for monolithic ceramic structures …”

Section: Discussionmentioning

confidence: 63%

“…In this study, resin composite was used as abutment material instead of natural tooth that had an elasticity modulus of 15.5 GPa and hardness of 0.73 GPa comparable to that of human dentin as it would be difficult to standardize the dimensions of the latter . Resin composite abutments were air‐abraded in order to achieve micromechanical retention of the resin cement since adhesion of the cement to the abutment may play a role in fracture propagation at this interface.…”

Section: Discussionmentioning

confidence: 99%

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Reliability Analysis of Lithium Disilicate Crowns: Effectof Veneering and Milling Production Workflow

Cardelli

Serafini

Sinjari

et al. 2016

Journal of Prosthodontics

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Purpose: To evaluate the reliability of lithium disilicate crowns produced using either CAD/CAM milling or thermopress workflow, for monolithic or veneered framework design for crowns. Materials and Methods: Lithium disilicate crowns (N = 40) were produced using one of four different workflows, namely (a) MTP: monolithic thermopressed crowns, (b) MCM: monolithic CAD/CAM milled, (c) VTP: thermopressed frameworks veneered, or (d) VCM: CAD/CAM milled crowns veneered. The specimens were adhesively luted to resin composite abutments and then tested until fracture in a universal testing machine (1 mm/min). Failure types were classified and further evaluated under stereomicroscope and SEM. The data (N) were analyzed using one-way ANOVA.Weibull distribution values including the Weibull modulus (m), characteristic strength ( 0 ), and probability of failure at 5% (0.05) were calculated. Results: Fabrication method did not significantly influence the mean fracture strength (N) of lithium disilicate crowns (MTP: 3626 ± 283; MCM: 3719 ± 483; VTP: 3754 ± 485; VCM: 3302 ± 604) (p = 0.154). Weibull distribution presented lower shape value (m) of VCM (m = 5.81) followed by VTP (m = 8.83), MCM (m = 8.84) compared to MTP (m = 12.9). Type V failures (severe fracture of the crown and/or tooth) were experienced explicitly in all groups. The monolithic specimens showed a homogeneous structure without porosities. Wake hackles were observed at the fracture surface, with a radial path directed to the cervical area. The veneered crowns presented twist and wake hackles propagated perpendicularly from the cement-ceramic interface. Conclusion: Monolithic or veneered lithium disilicate crowns presented similar fracture strength when frameworks or entire crowns were milled or thermopressed but distribution with Weibull characteristics was more favorable for monolithic pressed crowns and the least reliable for the milled and veneered crowns. Clinical Significance: Lithium disilicate ceramic crowns could be produced either by thermopressing or CAD/CAM milling workflow without sacrificing their reliability.Metal-ceramic crowns still represent the gold standard for single-tooth prosthetic rehabilitation, with a 5-year survival rate of 95.6%.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 45%

Section: Discussionmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 99%

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Reliability Analysis of Lithium Disilicate Crowns: Effectof Veneering and Milling Production Workflow

Cardelli

Serafini

Sinjari

et al. 2016

Journal of Prosthodontics

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“…Alternatively, when small amounts of enamel preparation are needed, a two‐step approach can be adopted. Vertical preparation has been tested in vitro and in vivo with high‐strength ceramics and lithium disilicate for full crowns and veneers with marginal fit similar to conventional preparation and survival rates over 95% from 4 to 12 year …”

Section: Discussionmentioning

confidence: 99%

Laminate veneers: Preplanning and treatment using digital guided tooth preparation

Silva

Stanley²,

Gardee

2020

J Esthet Restor Dent

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Objective The ability to control the reduction of tooth structure in a precise and measurable way during the preparation of ceramic veneers is a clinical challenge. The objective of this article is to introduce a new digital technology that can be used to address this challenge showing its advantages and limitations. First Fit is a digitally guided tooth preparation system that can be used to control the accurate and efficient preparation of teeth. In some cases, the system can be used to prepare the teeth for previously made restorations based on planned digital reduction. Clinical considerations The First Fit system uses 3D‐printed guides and a specially designed handpiece for guided veneer preparation using either a one‐step or a two‐step approach. In the one‐step approach, final restorations are produced prior to preparation of the teeth using reduction guides, and veneers are cemented on the same day as preparation. The two‐step approach includes a preparation phase during which the teeth are prepared using a combination of the reduction guides and free hand techniques. Cementation is then completed at a second appointment. Conclusion The First Fit system controls and guides veneer preparation with a minimally invasive approach. In some cases, it enables the production of veneers before tooth preparation, alleviating the need for provisional restorations. Clinical significance The guided restorative dentistry technique described here utilizes digital CAD‐CAM technology to achieve predictable and accurate results in a minimally invasive and efficient manner.

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Additive manufacturing of lithium disilicate glass-ceramic by vat polymerization for dental appliances

et al. 2022

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Durability and Weibull Characteristics of Lithium Disilicate Crowns Bonded on Abutments with Knife‐Edge and Large Chamfer Finish Lines after Cyclic Loading

Abstract: Pressed lithium disilicate ceramic crowns may not require invasive finish line preparations since finish line type did not impair the strength after aging conditions.

Cited by 20 publications

References 17 publications

Reliability Analysis of Lithium Disilicate Crowns: Effectof Veneering and Milling Production Workflow

Reliability Analysis of Lithium Disilicate Crowns: Effectof Veneering and Milling Production Workflow

Laminate veneers: Preplanning and treatment using digital guided tooth preparation

Additive manufacturing of lithium disilicate glass-ceramic by vat polymerization for dental appliances

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