Intraoral low-temperature degradation of monolithic zirconia dental prostheses: Results of a prospective clinical study with ex vivo monitoring

Koenig, Vinciane; Bekaert, Sandrine; Dupont, Nathalie; Vanheusden, Alain; Goff, Stan; Douillard, Thierry; Chevalier, Jérôme; Djaker, Nadia; Chapelle, Marc Lamy de la; Amiard, Frédéric; Dardenne, N.; Mainjot, Amélie

doi:10.1016/j.dental.2021.03.008

Cited by 23 publications

(12 citation statements)

References 64 publications

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“…Despite a modest improvement in translucency (translucency parameter—TP first generation: ~7; TP second generation: ~10), 117 these Y‐TZP systems can achieve reasonable biomimetic characterization with the addition of coloring liquids before sintering and superficial extrinsic staining, while maintaining high mechanical properties 47,108,118,119 . Still, due to the metastability of 3Y‐TZP, the second generation zirconia has clinically shown 100% loss of glaze at the occlusal surfaces at 1 year and phase transformation characterized also by increased roughness and grain pull‐out at the occlusal surfaces in a similar pattern observed in the past for retrieved orthopedic hip prostheses 120 …”

Section: All‐ceramic Systemssupporting

confidence: 55%

“…47,108,118,119 Still, due to the metastability of 3Y-TZP, the second generation zirconia has clinically shown 100% loss of glaze at the occlusal surfaces at 1 year and phase transformation characterized also by increased roughness and grain pull-out at the occlusal surfaces in a similar pattern observed in the past for retrieved orthopedic hip prostheses. 120 The limited light transmission of second generation Y-TZPs have led to the development of a third generation dental zirconia, ultra-translucent zirconia. 121 This material is characterized by the predominant presence of optically isotropic cubic crystals by increasing yttria content (4-5 mol%), yttria partially stabilized zirconia (Y-PSZ).…”

Section: Polycrystalline Ceramicsmentioning

confidence: 99%

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Indirect restorative systems—A narrative review

Bonfante

Calamita

Bergamo

2023

J Esthet Restor Dent

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Objective: The background and clinical understanding of the properties of currently available indirect restorative systems and fabrication methods is, along with manufacturer and evidence-based literature, an important starting point to guide the clinical selection of materials for tooth and/or implant supported reconstructions. Therefore, this review explores most indirect restorative systems available in the market, especially all-ceramic, along with aspects of manufacturing process, clinical survival rates, and esthetic outcomes. Overview: Progressive incorporation of new technologies in the dental field and advancements in materials science have enabled the development/improvement of indirect restorative systems and treatment concepts in oral rehabilitation, resulting in reliable and predictable workflows and successful esthetic and functional outcomes. Indirect restorative systems have evolved from metal ceramics and polymers to glass ceramics, polycrystalline ceramics, and resin-matrix ceramics, aiming to improve not only biological and mechanical properties, but especially the optical properties and esthetic quality of the reconstructions, in attempt to mimic natural teeth. Conclusions: Based on several clinical research, materials, and patient-related parameters, a decision tree for the selection of indirect restorative materials was suggested to guide clinicians in the rehabilitation process. Clinical Significance: The pace of materials development is faster than that of clinical research aimed to support their use. Since no single material provides an ideal solution to every case, professionals must continuously seek information from well designed, long-term clinical trials in order to incorporate or not new materials and technological advancements.

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Section: All‐ceramic Systemssupporting

confidence: 55%

Section: Polycrystalline Ceramicsmentioning

confidence: 99%

Indirect restorative systems—A narrative review

Bonfante

Calamita

Bergamo

2023

J Esthet Restor Dent

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“…The mechanical stress of the crack leads to a phase transformation of the neighboring zirconia grains from tetragonal (t) to monoclinic (m), which is associated with an increase in volume to counteract crack growth (Christel et al, 1989; Piconi & Maccauro, 1999). However, in the warm and humid environment of the oral cavity, zirconia may undergo a spontaneous t‐m transformation, potentially leading to an increased roughness, micro‐cracks, and fractures of the zirconia implant (“aging,” low‐temperature degradation, LTD) (Chevalier et al, 2007; Koenig et al, 2021; Sanon et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Influence of loading and aging on the fracture strength of an injection‐molded two‐piece zirconia implant restored with a zirconia abutment

Kohal

Schierholz

Nold

et al. 2022

Clinical Oral Implants Res

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Objective To investigate the fracture strength and potential phase transformation of an injection‐molded two‐piece zirconia implant restored with a zirconia abutment after loading and/or aging. Methods Thirty‐two two‐piece zirconia implants (4.0 mm diameter) restored with zirconia abutments were embedded according to ISO 14801 and divided into four groups (n = 8/group): Three groups were either exclusively hydrothermally treated (group HT; 85°C), dynamically loaded (group DL; 107 cycles; 98 N), or subjected to both treatments simultaneously (group DL/HT). One group remained untreated (group 0). A sample from each group was cross‐sectioned and examined by scanning electron microscopy for possible crystal phase transformation. The remaining samples were then loaded to fracture in a static loading test. A one‐way ANOVA was used for statistical analyses. Results During dynamic loading, three implants of group DL and six implants of group DL/HT fractured at a load of 98 N. The fracture strength of group DL/HT (108 ± 141 Ncm) was significantly reduced compared to the other groups (group 0: 342 ± 36 Ncm; HT: 363 ± 49 Ncm; DL: 264 ± 198 Ncm) (p < .05). Fractures from group 0 and HT occurred at both implant and abutment level, whereas implants from group DL and DL/HT fractured only at implant level. A shallow monoclinic transformation zone of approximately 2 μm was observed following hydrothermal treatment. Conclusions Within the limitations of this study, it can be concluded that dynamic loading and the combination of loading and aging reduced the fracture strength of the implant abutment combination. Hydrothermal treatment caused a shallow transformation zone which had no influence on the fracture strength.

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“…The main disadvantage of this generation of PSZ is that the cubic/tetragonal stabilisation results in lower fracture toughness of third-generation zirconia. Therefore, the most translucent third-generation zirconia materials were announced for anterior restorations and limited to 3-unit bridges in the posterior regions [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Effect of Two Brands of Glaze Material on the Flexural Strength and Probability of Failure of High Translucent Monolithic Zirconia

Singh

Lyons

et al. 2021

Materials

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(1) Background: The effect of glazing on the mechanical properties of monolithic high translucent zirconia is not well reported. Therefore, the purpose of this study was to evaluate the effect of glazing on the flexural strength of high translucent zirconia; (2) Methods: Ninety specimens were prepared from second-generation 3Y-TZP high translucent blocks and divided into three groups. Glaze materials were applied on one surface of the specimen and subjected to a four-point bending test and flexural stress and flexural displacement values were derived. Descriptive fractographic analysis of surfaces was conducted to observe the point of failure and fracture pattern.; (3) Results: Control-nonglazed (647.17, 1σ = 74.71 MPa) presented higher flexural strength values compared to glaze I (541.20, 1σ = 82.91 MPa) and glaze II (581.10, 1σ = 59.41 MPa). Characteristic strength (σƟ) from Weibull analysis also observed higher (660.67 MPa) values for the control specimens. Confocal microscopy revealed that glazed surfaces were much rougher than control surfaces. Descriptive fractographic analysis revealed that there was no correlation between the point of failure initiation and flexural strength; (4) Conclusions: The test results demonstrated that glazing significantly decreased the flexural strength and flexural displacement of the zirconia specimens.

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Intraoral low-temperature degradation of monolithic zirconia dental prostheses: Results of a prospective clinical study with ex vivo monitoring

Cited by 23 publications

References 64 publications

Indirect restorative systems—A narrative review

Indirect restorative systems—A narrative review

Influence of loading and aging on the fracture strength of an injection‐molded two‐piece zirconia implant restored with a zirconia abutment

Effect of Two Brands of Glaze Material on the Flexural Strength and Probability of Failure of High Translucent Monolithic Zirconia

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