Extended glaze firing on ceramics for hard machining: Crack healing, residual stresses, optical and microstructural aspects

Aurélio, Iana Lamadrid; Dorneles, L. S.; May, Liliana Gressler

doi:10.1016/j.dental.2016.12.002

Cited by 57 publications

(57 citation statements)

References 48 publications

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“…Thus, the null hypothesis was rejected. Ideally, the ceramic firings should not interfere in the restoration characteristics . However, we noticed in our research that all groups had a ΔE that indicates a perceptible color change (E 00 > 0.8), although these color changes were clinically unacceptable (ΔE 00 > 1.8) and only occurred after the sixth firing of control lithium disilicate (CO 2x‐6x), as well as the samples from group DC (DC 2x‐4x and DC 2x‐6x).…”

Section: Discussionmentioning

confidence: 66%

“…In which ΔL, ΔC, and ΔH are the differences in lightness, chroma, and hue, respectively; ΔR is an interaction term between the chroma and hue differences . The kL, kC, and kH values are the parametric factors to be adjusted according to different viewing parameters such as textures, backgrounds, and separations, for the lightness, chroma, and hue components, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Effect of staining and repeated firing on the surface and optical properties of lithium disilicate

Miranda

Barcellos

MartinelliLobo

et al. 2019

J Esthet Restor Dent

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Objective: Evaluate the effect of staining and repeated firings on color, translucency and surface proprieties of CAD/CAM lithium disilicate (LD).Material and Methods: One hundred eighty LD discs were made (ISO 6872) and distributed in different groups (n = 20): control (CO)-no treatment; single-step characterization (SC)-crystallization and staining fired together; and double step characterization (DC)-crystallization and then staining. The samples were submitted to two, four, or six firings, resulting in nine groups: COII, COIV, COVI, SCII, SCIV, SCVI, DCII, DCIV, and DCVI. The color and translucency were measured by a reflectance spectrophotometer. Surface roughness (Ra) and Vickers nano-hardness were also measured. ANOVA and Tukey statistical tests were used (α = .05). Results:Only CO and DC demonstrated significant color alterations (ΔE 00 > 1.8). SC and DC did not show changes in translucency by the number of firings (P > .05); however, for CO (P = .02) these values increased. Nano-hardness was similar in all groups (P > .05). Ra values indicated differences due to the type of characterization (SC presented the highest values) and number of firings (CO and DC groups) (P < .01).Conclusion: SC promoted color, translucency, and roughness stability after repeated firings.Clinical Significance: The single characterization technic in CAD/CAM lithium disilicate presents good color, translucency, and hardness stability, which promote predictable results to monolithic restoration. K E Y W O R D Scolor, lithium disilicate, repeated firing, roughness, translucency

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Section: Discussionmentioning

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Effect of staining and repeated firing on the surface and optical properties of lithium disilicate

Miranda

Barcellos

MartinelliLobo

et al. 2019

J Esthet Restor Dent

View full text Add to dashboard Cite

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“…Nevertheless, after crystallization, it was possible to observe the presence of a zirconia peak only for Cfir. According to Krüger et al [21] and Aurélio et al [22], the absence of crystalline zirconia after the CFP indicates that ZrO 2 remains amorphous and aggregated to the glassy matrix. It appears that zirconia grains decreased after the crystallization process, which may have contributed to higher fracture strength of the crystallized Celtra Duo, as already described in the literature [4,23].…”

Section: Discussionmentioning

confidence: 97%

Impact of crystallization firing process on the microstructure and flexural strength of zirconia-reinforced lithium silicate glass-ceramics

et al. 2018

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“…Glaze firing is supposed to be advantageous in terms of healing cracks that might have been induced by hard milling. 42 Glaze may also seal deep grooves or imperfections that might not be completely reached by polishing. From roughness aspects, polishing has proven to be effective in reducing high surface roughness of glass ceramics to similar values as measured for glaze layers.…”

Section: Discussionmentioning

confidence: 99%

In vitro performance and fracture resistance of novel CAD/CAM ceramic molar crowns loaded on implants and human teeth

et al. 2018

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PURPOSETo investigate the fatigue and fracture resistance of computer-aided design and computer-aided manufacturing (CAD/CAM) ceramic molar crowns on dental implants and human teeth.MATERIALS AND METHODSMolar crowns (n=48; n=8/group) were fabricated of a lithium-disilicate-strengthened lithium aluminosilicate glass ceramic (N). Surfaces were polished (P) or glazed (G). Crowns were tested on human teeth (T) and implant-abutment analogues (I) simulating a chairside (C, crown bonded to abutment) or labside (L, screw channel) procedure for implant groups. Polished/glazed lithium disilicate (E) crowns (n=16) served as reference. Combined thermal cycling and mechanical loading (TC: 3000×5℃/3000×55℃; ML: 1.2×106 cycles, 50 N) with antagonistic human molars (groups T) and steatite spheres (groups I) was performed under a chewing simulator. TCML crowns were then analyzed for failures (optical microscopy, SEM) and fracture force was determined. Data were statistically analyzed (Kolmogorow-Smirnov, one-way-ANOVA, post-hoc Bonferroni, α=.05).RESULTSAll crowns survived TCML and showed small traces of wear. In human teeth groups, fracture forces of N crowns varied between 1214±293 N (NPT) and 1324±498 N (NGT), differing significantly (P≤.003) from the polished reference EPT (2044±302 N). Fracture forces in implant groups varied between 934±154 N (NGI_L) and 1782±153 N (NPI_C), providing higher values for the respective chairside crowns. Differences between polishing and glazing were not significant (P≥.066) between crowns of identical materials and abutment support.CONCLUSIONFracture resistance was influenced by the ceramic material, and partly by the tooth or implant situation and the clinical procedure (chairside/labside). Type of surface finish (polishing/glazing) had no significant influence. Clinical survival of the new glass ceramic may be comparable to lithium disilicate.

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Extended glaze firing on ceramics for hard machining: Crack healing, residual stresses, optical and microstructural aspects

Cited by 57 publications

References 48 publications

Effect of staining and repeated firing on the surface and optical properties of lithium disilicate

Effect of staining and repeated firing on the surface and optical properties of lithium disilicate

Impact of crystallization firing process on the microstructure and flexural strength of zirconia-reinforced lithium silicate glass-ceramics

In vitro performance and fracture resistance of novel CAD/CAM ceramic molar crowns loaded on implants and human teeth

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