Fracture resistance of ceramic and polymer-based occlusal veneer restorations

Al-Akhali, Majed; Chaar, Mohamed Sad; Elsayed, Adham; Samran, Abdulaziz; Kern, Matthias

doi:10.1016/j.jmbbm.2017.06.013

Cited by 91 publications

(123 citation statements)

References 30 publications

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“…This study involves the fabrication of identical crowns on identical metal dies, this was to investigate one variance between groups Graph 1: Fracture load of groups with and without aging a conclusion that is supported by the results of the present study even though the differences recorded did not reach statistical significance in all four assessed groups. The larger fracture resistance recorded for e.Max is likely due to the interpenetrating needle-type lithium disilicate that responds better to load than the dispersed spherical charge in RNC or the fused particles of PICN; this result is in agreement with previously published results, 6,18,[26][27][28][29][30] and the literature highlights that lithium disilicate has clearly higher fracture strength than other ceramic groups. 6,18,26,[28][29][30] PICN with fused particles proved having higher strength than RNC with dispersed fillers.…”

Section: Discussionsupporting

confidence: 91%

“…The larger fracture resistance recorded for e.Max is likely due to the interpenetrating needle-type lithium disilicate that responds better to load than the dispersed spherical charge in RNC or the fused particles of PICN; this result is in agreement with previously published results, 6,18,[26][27][28][29][30] and the literature highlights that lithium disilicate has clearly higher fracture strength than other ceramic groups. 6,18,26,[28][29][30] PICN with fused particles proved having higher strength than RNC with dispersed fillers. According to Stawarczyk, the fact that PICN has higher resistance than RNC but lower than LDGC comes with the same order in hardness and wear properties to the antagonist teeth.…”

Section: Discussionsupporting

confidence: 91%

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Evaluation of the Adaptation and Fracture Resistance of Three CAD–CAM Resin Ceramics: An In vitro Study

Naffah

Ounsi

Özcan

et al. 2019

The Journal of Contemporary Dental Practice

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Aim:The internal fit and resistance to fracture of resin ceramics are to be evaluated compared to that of lithium disilicate as the control group. Materials and methods: Four groups of 20 crowns each (GC Cerasmart, Vita Enamic, Coltène Brilliant Crios, and e.max CAD) were cemented on identical metal dies. Marginal gaps were measured before cementation and load to fracture was applied after cementation, half of each group was thermodynamically aged (3,000 cycles of 5° to 55° immersion followed by 200,000 cycles of 100 N load), finally the crowns were loaded until fracture in a universal testing machine. Statistical package for social sciences (SPSS) package 23 was used for statistical work. Results: Marginal gaps ranged between 68.5 ± 23.8 µm and 87 ± 29.1 µm while occlusal gaps ranged from 220.7 ± 33.3 µm to 275.5 ± 46.5 µm and were not significantly different between groups. Fracture loads ranged from 633.8 ± 127.3 N to 1596.4 ± 497.7 N with lithium disilicate glass ceramics (LDGCs) and Enamic having higher values than resin nano-ceramics (RNCs). The fracture resistance was more related to material than aging and gap value. Conclusion: The margin adaptation of resin ceramics was comparable to lithium disilicate with no significant difference. Lithium disilicate showed a higher resistance than resin ceramics and there was a higher resistance to fracture for polymer-infiltrated ceramic-network (PICN) than RNCs. Clinical significance: Resin ceramics can have marginal adaptation and fracture resistance within clinical acceptance; therefore, they can be a good chair-side solution achieved in a single appointment session.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 91%

Evaluation of the Adaptation and Fracture Resistance of Three CAD–CAM Resin Ceramics: An In vitro Study

Naffah

Ounsi

Özcan

et al. 2019

The Journal of Contemporary Dental Practice

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“…On the other hand, Al-Akhali et al, 57 evaluated the influence of thermodynamic loading on the durability and fracture resistance of four dental CAD/ CAM occlusal veneers: lithium disilicate (e.max CAD), ZLS (Vita Suprinity)), Polymer-infiltrated ceramic (Vita Enamic), and PMMA (Telio CAD). They reported that ZLS (Vita Suprinity) veneers showed significantly higher fracture resistance than occlusal veneers made from resin containing materials (Vita Enamic and Telio CAD).…”

Section: Discussionmentioning

confidence: 99%

Fracture Resistance of A Newly Proposed Occlusal Veneer Design Using Two Different CAD/CAM Ceramic Materials

Halim

2018

Egyptian Dental Journal

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Statement of the Problem:Management of severe occlusal erosive lesions constitutes a challenging therapeutic approach to the restorative dentist. Bonded occlusal veneers have been introduced as a conservative solution to traditional onlays or complete coverage crowns. Still, there is lack of information and conflict in the data concerning the mechanical performance of the occlusal veneer materials and designs.Purpose: The purpose of this in vitro investigation was to evaluate and compare the fracture resistance and failure mode of a newly proposed occlusal veneer design constructed of zirconia reinforced lithium silicate and hybrid ceramic materials with the conventional design restored with the same tested materials. Materials and Methods:Two mandibular first molars of a typodont were chosen to perform the master preparations; one for the conventional planar occlusal veneer design, and the second for the proposed modified design which consisted of occlusal veneer preparation with circumferential chamfer finish line and two shallow proximal slots. Ten elastomeric impressions were taken for each design using the putty and light polysiloxane addition silicone impression material. The twenty impressions were poured using type IV dental stone to produce twenty stone casts, ten for each design. Each group of stone casts was subdivided randomly into two equal subgroups according to the ceramic material to be tested; the zirconia reinforced lithium silicate "Celtra Duo" and the hybrid resin nano ceramic "Lava Ultimate". All the occlusal veneers were fabricated using the CAD/CAM Cerec InLab SW 4.2.5 System. The veneers were then checked on both the stone casts and the master preparation on the typodont for perfect seating, after the Celtra veneers were crystallized and glazed and the Lava veneers being subjected to finishing and polishing. The preparations were duplicated to obtain twenty epoxy casts over which the occlusal veneers were adhesively cemented using a standard bonding protocol. The samples were then subjected to thermal cycling program. All the samples were individually mounted on the Instron testing machine with a loadcell of 5 KN and fracture test was done by compressive mode of load applied occlusally using a metallic rod with spherical tip (5.6 mm diameter) at cross-head speed of 1mm/min. The load required to fracture was recorded in Newton and tabulated to be statistically analyzed. The fractured specimens were examined to detect the mode of failure. (2900)Carl Hany Halim E.D.

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“…Bonded occlusal veneers made of e.max CAD were found to resist to forces of up to 800 N and 1000 N, when their thickness was 0.6‐1.0 mm or 1.2‐1.8 mm, respectively; these values are only slightly inferior to those of monolithic full crowns of comparable thickness . The use of ultrathin LDG occlusal veneers (0.6 mm) has been reported to be a promising and viable restorative procedure . Further, Guess et al reported no significant effect on the fracture resistance of pressable LDG ceramic onlay restorations on premolars reducing the preparation depth to 1.00 and 0.5 mm.…”

Section: Introductionmentioning

confidence: 99%

“…22 The use of ultrathin LDG occlusal veneers (0.6 mm) has been reported to be a promising and viable restorative procedure. 23,24 Further, Guess et al 25 reported no significant effect on the fracture resistance of pressable LDG ceramic onlay restorations on premolars reducing the preparation depth to 1.00 and 0.5 mm.…”

mentioning

confidence: 98%

Influence of preparation designs on marginal adaptation and failure load of full‐coverage occlusal veneers after thermomechanical aging simulation

Angerame

Biasi

Agostinetto³

et al. 2019

J Esthet Restor Dent

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Objectives To evaluate the fracture resistance and marginal quality of maxillary molars restored using lithium disilicate glass‐ceramic (LDG) occlusal veneers with two preparation designs. Methods Sixteen extracted maxillary molars were assigned to two groups (n = 8). In group 1 (G1), the teeth received a preparation for a conservative full‐coverage occlusal veneer restoration with a 90° rounded shoulder margin. In group 2 (G2), the teeth underwent a 1‐mm cusp reduction with a marginal chamfer. LDG restorations (IPS e.max CAD) were obtained with the Cerec 3 CAD/CAM system and luted with Variolink II cement. After thermomechanical aging (1 250 000 cycles), the specimens were loaded to fracture. A semiquantitative marginal seal evaluation was performed observing resin replicas of the specimens at the scanning electron microscope. Cement thickness was assessed at the stereomicroscope on sectioned specimens. Collected data were statistically analyzed by parametric and nonparametric tests. Results The maximum load to fracture was 2395.01 ± 150.96 N in G1 and 2408.39 ± 112.66 N in G2. Most of the observed specimens exhibited restorable fractures and continuous margins. Cement thickness was 132 ± 38 μm in G1 and 150 ± 41 μm in G2. No differences between the groups emerged. Conclusion This study demonstrated similar satisfactory performance of the two considered preparations designs for occlusal veneer with LDG. Clinical Significance A new minimally invasive occlusal veneer preparation with marginal chamfer exhibited promising fracture resistance and marginal adaptation that were comparable to those of a standard conservative preparation for the restoration of molars with CAD/CAM lithium disilicate occlusal veneers.

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Fracture resistance of ceramic and polymer-based occlusal veneer restorations

Cited by 91 publications

References 30 publications

Evaluation of the Adaptation and Fracture Resistance of Three CAD–CAM Resin Ceramics: An In vitro Study

Evaluation of the Adaptation and Fracture Resistance of Three CAD–CAM Resin Ceramics: An In vitro Study

Fracture Resistance of A Newly Proposed Occlusal Veneer Design Using Two Different CAD/CAM Ceramic Materials

Influence of preparation designs on marginal adaptation and failure load of full‐coverage occlusal veneers after thermomechanical aging simulation

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