Bonding to CAD-CAM Composites: An Interfacial Fracture Toughness Approach

Eldafrawy, Maher; Ebroin, Marie; Gailly, Patrick; Nguyen, Jean‐François; Sadoun, Michaël; Mainjot, Amélie

doi:10.1177/0022034517728714

Cited by 44 publications

(46 citation statements)

References 24 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%

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%

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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“…For Lava Ultimate, the influence of micromechanical interlocking on the performance of the adhesive interface is particularly important since a high degree of conversion of polymers decreases the potential for chemical co-polymerization of any remaining free monomers with the monomers of the adhesive or resin cement. 23 The adhesion of ceramic materials may be enhanced by increasing the surface energy, and it can improve the wettability of the adhesive or resin cement on the material surface. 24 Thus, internal surface etching with hydrofluoric acid was performed according to the etching times recommended by the manufacturers of Vita Mark II, Vita Suprinity and Vita Enamic to create a reactive area that promotes resin infiltration.…”

Section: Discussionmentioning

confidence: 99%

“…Consequently, the surface of the ceramic became rough and micromechanically retentive. 23,27 Vita Suprinity was etched for 20 s, and this surface treatment created a relatively smooth surface with small undercuts, which can be attributed to the specific microstructure with fine, densely packed crystals. 27 Additionally, when the ceramic is etched, hydroxyl groups are exposed, and this group allows a chemical interaction with the silane coupling agent.…”

Section: Discussionmentioning

confidence: 99%

“…Vita Enamic has a low percentage of organic matrix, which may contribute little to the chemical co-polymerization of free monomers with the monomers of the adhesive or resin cement. 23 Therefore, it is assumed that micromechanical retention is important for the bond interface. However, when Vita Enamic was luted with RelyX Unicem 2, a high percentage of adhesive failure between the resin cement and restorative material occurred, having the lowest bond strength (25.97 MPa) among the adhesive strategies.…”

Section: Discussionmentioning

confidence: 99%

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Microtensile bond strength of CAD/CAM materials to dentin under different adhesive strategies

et al. 2017

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The present study aimed to evaluate the microtensile bond strength (µTBS) of novel computer-aided design/computer-aided manufacturing (CAD/CAM) restorative materials to dentin using different adhesive strategies. Thirty-two crowns were milled using CAD/CAM materials (Vita Mark II as control, Vita Suprinity, Vita Enamic and Lava Ultimate) and luted to dentin using different resin cements (RelyX ARC, RelyX Unicem 2 and RelyX Ultimate). The specimens were stored in 100% relative humidity at 37°C for 24 h and sectioned. The samples (n = 16) with cross-sectional areas of approximately 0.90 mm², were submitted to a µTBS test in a universal testing machine with a crosshead speed of 0.5 mm/min. The samples were analyzed with SEM to determinate the failure mode. According to 2-way ANOVA and Tukey's test (α=0.05), the interaction effect (material x luting strategy) was significant (p=0.001). Regardless of the luting strategy, a higher µTBS was obtained with Lava Ultimate and Vita Enamic, which were significantly different from Vita Mark II and Vita Suprinity (p<0.05). For Vita Mark II, Vita Suprinity, Vita Enamic, and Lava Ultimate, the µTBS obtained with RelyX Unicem 2 was not significantly different from that obtained with RelyX ARC or RelyX Ultimate. All groups obtained at least three types of failure. The adhesive strategy with self-adhesive resin cement was comparable to conventional resin cement with total-etch or self-etch adhesive techniques in the bond of novel CAD/CAM materials to dentin.

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“…The main difference of the proposed approach with conventional indirect methods is related to the absence of new VDO testing phase and provisional restorations use (One step), definitive indirect restorations being all bonded within two consecutive days, which reduces visit number, chairtime, cost and treatment complexity. The procedure is also characterized by the material approach, with the use of PICN materials (hybrid ceramics), which exhibit several advantages compared to ceramics and other composite materials, such as (1) the ability to be milled to a very low thickness with less edge chipping than ceramics which allowed for a “No prep” approach and a restoration design corresponding to the estimated tissue loss; (2) the ease of in‐mouth adjustments: the management of occlusal relationships required meticulous adjustments and from that point of view, PICNs were shown to be more adapted than ceramics; (3) the biomechanical properties, ceramics being brittle and stiff, while direct light‐cured composites exhibit a reduced strength and a too low elasticity modulus compared to tooth tissues; (4) the high degree of conversion of monomers, which improves chemical stability and reduces free monomer release compared to light‐cured composites; (5) the bonding properties, which were shown to be as good as glass‐ceramics when the material is etched . The use of CAD‐CAM indirect restorations facilitates tooth anatomy and occlusion management with a reduced chairtime compared to direct composites.…”

Section: Discussionmentioning

confidence: 99%

The One step‐No prep technique: A straightforward and minimally invasive approach for full‐mouth rehabilitation of worn dentition using polymer‐infiltrated ceramic network (PICN) CAD‐CAM prostheses

Mainjot¹

2018

J Esthet Restor Dent

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Objectives To introduce a novel approach for full‐mouth rehabilitation of severely worn dentition using polymer‐infiltrated ceramic network (PICN) computer‐aided‐design and manufacturing (CAD‐CAM) restorations, without tooth tissue preparation and provisional phase. Clinical considerations Three patients with generalized tooth wear, suffering from dental pain, masticatory dysfunction, bruxism and neck and back pain, were selected and treated in collaboration with physiotherapists. Occlusal analyses were performed and full‐mouth diagnostic wax‐ups were designed on the basis of estimated tissue loss. Deficient direct restorations were replaced and low‐thickness PICN (Vita Enamic) restorations (up to 0.2 mm) were CAD‐CAM designed from wax‐ups, milled, tried‐in and then bonded within two consecutive days. To mask palatal veneers, either buccal direct composites or glass‐ceramic veneers were later performed. An occlusal splint was realized. Clinical results were shown to be successful after a follow‐up of 22, 18, and 13 months, respectively. The absence of provisional phase did not engender any inconveniences. Patient reported outcomes were very positive, showing a reduction in neck and back pain and a well‐being increase. Conclusion The proposed protocol is particularly minimally invasive and straightforward compared to classical techniques. PICNs exhibit several advantages compared to other materials. Preliminary results of this multidisciplinary approach are promising but deserve further clinical research. Clinical significance The development of CAD‐CAM technologies offers the possibility of improving treatment of severe worn dentition, reducing chairtime and need of tooth tissue preparation, and introducing a new class of composite materials (hybrid ceramics), which exhibit interesting properties for this indication. The influence of the proposed multidisciplinary approach, particularly the collaboration with physiotherapists, needs to be further explored with respect to treatment of associated symptoms, such as masticatory muscles hypertrophy and neck pain.

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Bonding to CAD-CAM Composites: An Interfacial Fracture Toughness Approach

Cited by 44 publications

References 24 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

Microtensile bond strength of CAD/CAM materials to dentin under different adhesive strategies

The One step‐No prep technique: A straightforward and minimally invasive approach for full‐mouth rehabilitation of worn dentition using polymer‐infiltrated ceramic network (PICN) CAD‐CAM prostheses

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