Internal adjustments decrease the fatigue failure load of bonded simplified lithium disilicate restorations

Rodrigues, Camila da Silva; Guilardi, Luís Felipe; Follak, Andressa Cargnelutti; Prochnow, Catina; May, Liliana Gressler; Valandro, Luiz Felipe

doi:10.1016/j.dental.2018.05.015

Cited by 27 publications

(3 citation statements)

References 45 publications

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“…6,7 Moreover, clinical procedures include dental bleaching, prophylaxis, crown adjustment, and scaling and root planing. 8 Hence, studies have found that these procedures may cause possible surface degradations related to the mechanical removal of the glazed layer and the chemical dissolution of the ceramic glass networks (silica particles), resulting in a rougher and less glossed surface. 4,9,10 Consequently, the affected surface will enhance stain adsorption, change its optical properties, wear the antagonist’s teeth, reduce its fracture strength, increase plaque adhesion, and the possibility of periodontal diseases and recurrent caries.…”

Section: Introductionmentioning

confidence: 99%

The effect of coffee and whitening systems on surface roughness and gloss of CAD/CAM lithium disilicate glass cermaics

Al‐Angari

Meaigel

Almayouf

et al. 2021

Journal of Applied Biomaterials & Functional Materials

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Objectives: To investigate the effects of a coffee beverage and two whitening systems on the surface roughness and gloss of glazed Lithium Disilicate Glass-Ceramics (LDGC) for computer-aided design/computer-aided manufacturing (CAD/CAM) systems. Methods: Sixty-eight LDGC disks (12 × 10 × 2 mm) were prepared from blocks of CAD/CAM systems (IPS e.max CAD ceramic). Baseline measurements for surface roughness (Ra) and gloss (GU) were taken using a 3-D optical profilometer and a glossmeter, respectively; then specimens were randomized into four groups ( n = 17). All specimens were immersed in a coffee solution (24 h × 12 days) then subjected to two whitening systems. G1-negative control (kept moist × 7 days); G2-positive control (brushed with distilled water, 200 g/load, 2 min twice daily × 7 days); G3-whitening toothpaste (Colgate optic white; relative dentin abrasivity (RDA) = 100, 200 g/load, 2 min twice daily × 7 days); and G4-simulated at-home bleaching protocol (Opalescence,15% carbamide peroxide (CP), 6 h/day × 7 days). The study outcomes were measured at baseline and after the treatments. Data were analyzed using paired T-test and one-way ANOVA (α = 0.05). Results: The mean surface roughness significantly increased ( p ⩽ 0.002) for all groups after the designated treatment protocols. Among groups, the mean surface roughness of G2 and G3 were significantly higher ( p ⩽ 0.001) (Ra: 0.51 and 0.57 μm, respectively) compared to the control group (Ra: 0.23 μm), and were not significantly different from G4 (Ra: 0.46 μm). Surface gloss decreased with no significant change within or among groups after treatment. Conclusion: All glazed LDGC had a significant increase in surface roughness after being subjected to simulated 1 year of coffee drinking and whitening systems (15% CP and whitening toothpaste), and the greatest change was associated with brushing (simulating 8 months). However, coffee beverages and whitening systems had no significant effect on the surface gloss.

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Section: Introductionmentioning

confidence: 99%

The effect of coffee and whitening systems on surface roughness and gloss of CAD/CAM lithium disilicate glass cermaics

Al‐Angari

Meaigel

Almayouf

et al. 2021

Journal of Applied Biomaterials & Functional Materials

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“…But ceramics are brittle and notoriously unforgiving: finishing, polishing, and bonding often involve procedures that generate strength-degrading microcrack damage in the subsurface (Xu and Jahanmir 1994; Xu et al 1996; Kosmač et al 1999; Coldea et al 2013). Computer-aided design (CAD)/computer-aided manufacturing (CAM) machining (milling) (Denry 2013), intraoral and extraoral adjustments (grinding) (Rodrigues et al 2018), and surface modifications (grit blasting) (Zhang et al 2004) are prime cases in point. Clinical studies confirm that attendant cracking associated with milling and grinding damage in dental ceramics can be a principal source of failure (Krämer et al 1999; Belli et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Exploring Ductility in Dental Ceramics

et al. 2022

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Two damage regimes—“brittle” and “ductile”—have been identified in the literature on ceramic grinding, machining, grit blasting, and wear. In the brittle regime, the damage mechanism is essentially crack formation, while in the ductile region, it is quasiplasticity. Onset of the brittle mode poses the greater threat to strength, so it becomes important to understand the mechanics of ductile–brittle thresholds in these materials. Controlled microcontact tests with a sharp indenter are employed to establish such thresholds for a suite of contemporary computer-aided design/computer-aided manufacturing dental ceramics. Plots of flexural strength S versus indentation load P show a steep decline beyond the threshold, consistent with well-established contact mechanics relations. Threshold dimensions occur on a scale of order 1 µm and contact load of order 1 N, values pertinent to practical grit finishing protocols. The ductile side of ceramic shaping is accessed by reducing grit sizes, applied loads, and depths of cut below critical levels. It is advocated that critical conditions for ductile shaping may be most readily quantified on analogous S( P) plots, but with appropriate machining variable (grit size, depths of cut, infeed rate) replacing load P. Working in the ductile region offers the promise of compelling time and cost economies in prosthesis fabrication and preparation.

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“…Estudos que avaliaram as dimensões destes espaços observaram que a variação ocorria de acordo com o material de restauração, a técnica de moldagem e a técnica de produção das peças restauradoras (14, 68,69). Aboushelib e col. (70) identificaram valores médios de linhas de cimentação da ordem de 106,7 (±29,6) µm para facetas cerâmicas prensadas e 340,4 (±143,4) µm para facetas cerâmicas usinadas.…”

Section: Viscosidadeunclassified

Influência da composição monomérica e do pré-aquecimento na viscosidade, grau de conversão, propriedades mecânicas e ópticas de resinas compostas experimentais

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Internal adjustments decrease the fatigue failure load of bonded simplified lithium disilicate restorations

Cited by 27 publications

References 45 publications

The effect of coffee and whitening systems on surface roughness and gloss of CAD/CAM lithium disilicate glass cermaics

The effect of coffee and whitening systems on surface roughness and gloss of CAD/CAM lithium disilicate glass cermaics

Exploring Ductility in Dental Ceramics

Influência da composição monomérica e do pré-aquecimento na viscosidade, grau de conversão, propriedades mecânicas e ópticas de resinas compostas experimentais

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