Fracture Resistance of Pressed and Milled Lithium Disilicate Anterior Complete Coverage Restorations Following Endodontic Access Preparation

Gerogianni, Petrina; Lien, Wen; Bompolaki, Despoina; Verrett, Ronald G.; Haney, Stephan J; Mattie, Patrick; Johnson, R. P.

doi:10.1111/jopr.12798

Cited by 22 publications

(22 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The clinical success of the dental restoration is defined by its longevity, which is substantially influenced by the oral environment. For a reasonable estimation of the long-term stability of dental restorative materials in the clinical situation, artificial aging tests to simulate oral environmental variables, and thermal cycling should be designed [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Surface Characterization and Optical Properties of Reinforced Dental Glass-Ceramics Related to Artificial Aging

et al. 2020

View full text Add to dashboard Cite

The development of various dental glass-ceramic materials and the evolution of novel processing technologies lead to an essential change in the clinical and technical workflow. The long-term success of a dental restoration treatment is defined by its durability, which is directly influenced by the oral environment. This study’s purpose was to evaluate the artificial aging behavior of nanostructured, respective microstructured ceramics related to surface topography, roughness, and optical properties. Six monolithic restoration materials were selected: milled lithium disilicate glass-ceramic (LDS-M) MT (medium translucency), hot-pressed lithium disilicate glass-ceramic (LDS-P) MT and HT (high translucency), milled zirconia-reinforced lithium silicate ceramic (ZLS-M) MT and hot-pressed zirconia-reinforced lithium silicate ceramic (ZLS-P) MT and HT, resulting n = 96 surfaces. All the samples were artificially aged by thermal cycling, and all investigations were made before and after thermal cycling. In terms of optical properties, differences recorded between ZLS and LDS ceramics are not significant. Thermal cycling increases the translucency of ZLS and LDS glass-ceramic materials significantly, with the most harmful effect on the pressed and polished samples. Micro- and nano roughness are significantly influenced by in vitro aging and a negative correlation was recorded. Glazed samples are characterized by significant rougher surfaces for all types of materials. On nanolevel, ZLS materials are significantly smoothed by thermal cycling.

show abstract

Section: Introductionmentioning

confidence: 99%

Surface Characterization and Optical Properties of Reinforced Dental Glass-Ceramics Related to Artificial Aging

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Thermal cycling is a useful method to accelerate the artificial ageing of the samples. This is useful because it can estimate the clinical performance by reproducing the temperature in the oral environment, which contributes to long-term degradation [ 65 ]. The water ageing method includes standardized thermal variations with baths ranging from 5 to 55 °C for several cycles [ 66 ].…”

Section: Discussionmentioning

confidence: 99%

“…The water ageing method includes standardized thermal variations with baths ranging from 5 to 55 °C for several cycles [ 66 ]. The thermal ageing protocol was involved in the artificial ageing simulation with 5000 cycles, simulating a clinical period of 6 months [ 65 ]. On the other hand, the staining cycling period has been equated with an immersion of 2 min/day, meaning 360 min/6 months, respective to 720 cycles for each sample and each beverage.…”

Section: Discussionmentioning

confidence: 99%

Optical Properties and Color Stability of Dental PEEK Related to Artificial Ageing and Staining

et al. 2021

View full text Add to dashboard Cite

Considering that the processes of PEEK discoloration caused by either intrinsic or extrinsic factors require elucidation, the aim of this study was to investigate the long-term effect of the combined action of ageing and immersing solutions on the optical properties and color stability of PEEK material, related to surface processing (polishing or glazing). (2) Methods: This study aims to determine the influence of different ageing and staining protocols on optical properties, color changes, and surface roughness of a reinforced PEEK material (bioHPP, Bredent, Senden, Germany). For ageing, specimens were submitted to 5000 cycles in a 55 °C bath and a 5 °C bath filled with distilled water. For staining, thermal cycling was performed in a hot coffee bath (55 °C) and a bath filled with distilled water (37 °C) and in a cold juice bath (5 °C) and a bath filled with distilled water (37 °C). Translucency (TP) and opalescence (OP) parameters were determined, the total color change value (ΔΕ*) was calculated, specimens’ surface roughness was analyzed, and statistical analyses were performed. (3) Results: The mean TP values of the studied samples were in the interval of 1.25–3.60, which is lower than those reported for natural teeth or other aesthetic restoration materials. The OP values of PEEK were registered in the range of 0.27–0.75, being also lower than those of natural teeth or other aesthetic restoration materials. OP has a very strong positive relationship with TP. The mean registered Ra values for all subgroups were below 0.13 µm. Artificial ageing and staining in hot coffee proved to increase the roughness values. (4) Conclusions: The glazing of PEEK has a favorable effect on surface roughness and opalescence, irrespective of the artificial ageing or staining protocols. Artificial ageing damages the color stability and roughness of PEEK, regardless of surface processing, and decreases the translucency and opalescence of glazed surfaces. Immersion in hot coffee leads to perceivable discolorations.

show abstract

“…The pressing of lithium disilicate ceramics with the lost wax technique combines a good marginal fit, an occlusal accuracy, low shrinkage, low porosity, good mechanical properties, and is above all, a simple and cost-effective fabrication method 3,4,[13][14] . Pressed lithium disilicate ceramic resulted in superior fracture toughness compared to milled ceramics 15,16) . These observations might be traced back to different heating parameters that are known to possibly upset the driving force for growing lithium disilicate crystals and alter the overall percentage of residual glasses, which in turn might adversely impact several material properties including load-bearing capacity and fracture toughness 17) .…”

Section: Introductionmentioning

confidence: 99%

Flexural strength and fracture toughness of two different lithium disilicate ceramics

et al. 2020

View full text Add to dashboard Cite

To test the impact of the pressing furnace on flexural strength and facture toughness of the lithium-disilicate-ceramics HS10PC (HS) and IPS e.max Press (IP). Three hundred and sixty specimens (3×4×30 mm) were pressed (n=180/ceramic) using different pressing furnaces, namely Austromat 654 Press-i-dent (AUS), Programat EP5000 (PRO), and Vario Press 300 (VAR). Three-point flexural strength (n=30) and fracture toughness (n=30) were measured. Flexural strength (336-360 MPa) was not affected by pressing furnace or ceramic and showed comparable values between all groups. Fracture toughness (2.65-2.81 MPa√m) provided higher values for HS pressed using AUS compared to specimens pressed in PRO and VAR. For IP, no impact of the pressing furnace on fracture toughness was found. IP presented higher fracture toughness than HS when pressed using PRO. No correlations were found. Both lithium disilicate ceramics showed comparable flexural strength regardless of the pressing furnace. Fracture toughness depended on the ceramic and on the pressing furnace.

show abstract

Fracture Resistance of Pressed and Milled Lithium Disilicate Anterior Complete Coverage Restorations Following Endodontic Access Preparation

Cited by 22 publications

References 33 publications

Surface Characterization and Optical Properties of Reinforced Dental Glass-Ceramics Related to Artificial Aging

Surface Characterization and Optical Properties of Reinforced Dental Glass-Ceramics Related to Artificial Aging

Optical Properties and Color Stability of Dental PEEK Related to Artificial Ageing and Staining

Flexural strength and fracture toughness of two different lithium disilicate ceramics

Contact Info

Product

Resources

About