Color matching of full ceramic versus metal-ceramic crowns - a spectrophotometric study

Background and aims. To verify the color match of metal-ceramic and full ceramic crowns, using instrumental methods. Methods. A number of 153 teeth (anterior and posterior teeth), in 62 patients, were restored with metal ceramic (MC, n=119), pressed-ceramic (PC, n=28), and zirconia-ceramic (ZC, n=6) full coverage crowns. The shade of a reference natural tooth was recorded instrumentally with a dental spectrophotometer (Vitaeasyshade Advance 4.0) in “single tooth measurement”, which provided the base color in Vita Classic (VC) and Vita 3D Master shades (3D). For verifying the outcome of the restoration “verify restoration” mode was used, and ΔE values were recorded for both VC and 3D Master shade guides. Moreover, matching symbols were also recorded (***=good, **=fair, *=poor). Descriptive statistics was performed and data were analyzed (One-sample z-Test, α=0.05) for comparison with visual thresholds in dentistry (Perceptibility Threshold – PT=1.2 and Acceptability Threshold – AT=2.7). Results. The data did not follow a normal distribution (Kolmogorov-Smirnov test, p<0.05). Recorded color difference was significantly higher than PT and AT, for all types of restorations, regardless of the coding system (p<0.05). For MC crowns in 2.52% (4.20% for 3D) of the cases the color difference was smaller than PT, in 19.32% (the same for 3D) of cases was between PT and AT, and in 78.15% (76.47% for 3D) of cases was higher than the AT. For PC crowns in 3.57% (0% for 3D) of the cases the color difference was smaller than PT, in 25% (32.14% for 3D) of cases was between PT and AT, and in 71.42% (67.85% for 3D) of cases was higher than the AT. In the case of ZC crowns none of the restorations had color difference smaller than PT, but in 16.66% of cases was between PT and AT, and in 83.33% of cases was higher than the AT, for both VC and 3D. Conclusion. Within the limitations of the study, a better color match was achieved in the case of pressed ceramic crowns, made of lithium disilicate. In most of the situations the color difference between the restoration and the reference tooth exceeded the perceptibility thresholds, but the matching was recorded as “fair” by the spectrophotometer.

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Variability in Colour Reproduction of Metal-Ceramic Crowns

Revista de Chimie ◽

10.37358/rc.18.10.6600 ◽

2018 ◽

Vol 69 (10) ◽

pp. 2655-2661

Author(s):

Luminita Oancea ◽

Alexandru Petre ◽

Mihai Burlibasa ◽

Eugenia Eftimie Totu ◽

Corina Marilena Cristache

Keyword(s):

Oral Cavity ◽

Color Difference ◽

Color Match ◽

Nickel Chromium ◽

Metal Ceramic ◽

Ceramic Crowns ◽

Different Color ◽

Single Crowns ◽

Enamel Layer ◽

Final Color

The aim of the present study was to objectively assess the variability in color reproduction of metal-ceramic (MC) single crowns fabricated by blending different color of opaque and body ceramic in order to point out which shade of the ceramic layers influences mostly the final color of the restorations. Eight nickel-chromium ceramic metal alloy copings were fabricated, on the same cast, following by blending the ceramic for the specific A3 color as follows: one reference ceramic (R) was blended, according to the producer s recommendation, and seven tests crowns have been build-up by considering as variables each one of the two uniform opaque layers, and dentin layer. Color of each manufactured crowns was measured after the three important steps of the technological workflow: the last opaque layer, enamel-dentin correction and final glaze firing using Vita Easyshade spectrophotometer. The best final color match (color difference of deltaE=0.8) was obtained for specimen no. 5, with a lighter opaque firs layer (A1). Fabricated specimens of all groups, except for no.4, with a darker dentin layer (A 3.5), showed deltaE values between 0.8 and 2.8, in the limit of the threshold perception in the oral cavity, and were scored as good. Within the limits of the present study, we can conclude that the dentin-enamel layer mostly influences the final color of the MC crowns.

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Susceptibility artifacts induced by crowns of different materials with prepared teeth and titanium implants in magnetic resonance imaging

Scientific Reports ◽

10.1038/s41598-021-03962-w ◽

2022 ◽

Vol 12 (1) ◽

Author(s):

Xiaomeng Gao ◽

Qianbing Wan ◽

Qingping Gao

Keyword(s):

Precious Metal ◽

Titanium Implants ◽

Zirconia Ceramic ◽

Signal Loss ◽

Susceptibility Artifacts ◽

Metal Ceramic ◽

Zirconia Crowns ◽

Artifacts Reduction ◽

Ceramic Crowns ◽

Tooth Preparation

AbstractThis study aimed to investigate the artifacts induced by crowns composed of different materials with prepared teeth and titanium implants. Resin, metal-ceramic, ceramic and zirconia crowns were fabricated and placed onto the prepared teeth on a human cadaver head or titanium implants with prosthesis abutments on a dry human mandible. The samples were scanned on a 1.5 T MRI apparatus, and artifact areas were defined as the signal intensity and signal loss adjacent to the prosthesis and measured by a threshold tool with ImageJ2x. Data were analyzed using SPSS 22.0. Resin, ceramic, zirconia, and precious metal-ceramic crowns barely produced artifacts on the cadaver skull (p > 0.999). By contrast, pure Ti and nonprecious metal-ceramic crowns created significant artifacts (p < 0.001). The average artifacts reduction of double Au-Pt and Ag-Pd metal-ceramic crowns combined with titanium implants and abutments was 79.49 mm2 (p < 0.001) and 74.17 mm2 (p < 0.001) respectively, while artifact areas were increased in double Co-Cr and Ni–Cr metal-ceramic crowns by 150.10 mm2 (p < 0.001) and 175.50 mm2 (p < 0.001) respectively. Zirconia, ceramic and precious metal-ceramic crowns induce less MRI artifacts after tooth preparation while precious metal-ceramic crowns alleviate artifacts in combination with titanium implants.

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Fit of metal ceramic crowns cast in Au-1.6wt% Ti alloy for different abutment finish line curvature

Dental Materials ◽

10.1016/j.dental.2005.04.025 ◽

2006 ◽

Vol 22 (5) ◽

pp. 397-404 ◽

Cited By ~ 12

Author(s):

Jianxiang Tao ◽

Masanobu Yoda ◽

Kohei Kimura ◽

Osamu Okuno

Keyword(s):

Ti Alloy ◽

Finish Line ◽

Metal Ceramic ◽

Ceramic Crowns

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Veterans Administration Cooperative Studies Project No. 147. Part III: Assessment of blindness in a clinical evaluation of alternative alloys for metal-ceramic crowns

Journal of Prosthetic Dentistry ◽

10.1016/0022-3913(86)90146-0 ◽

1986 ◽

Vol 56 (6) ◽

pp. 692-697 ◽

Cited By ~ 5

Author(s):

Harold F. Morris

Keyword(s):

Clinical Evaluation ◽

Veterans Administration ◽

Metal Ceramic ◽

Ceramic Crowns

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PROSPECTS FOR MANUFACTURING FRAMES OF METAL CERAMIC STRUCTURES OF DENTAL PROSTHESES BY THE METHOD OF SELECTIVE LASER SINTERING

"Medical & pharmaceutical journal "Pulse" ◽

10.26787/nydha-2686-6838-2021-23-6-232-239 ◽

2021 ◽

pp. 232-239

Author(s):

Stepanov V.A. ◽

Shemonaev V.I. ◽

Buyanov E.A. ◽

Grachev D.V. ◽

Parchomenko A.N. ◽

...

Keyword(s):

Objective Assessment ◽

Selective Laser Sintering ◽

Clinical Effectiveness ◽

Study Groups ◽

Laser Sintering ◽

Dental Prostheses ◽

Metal Ceramic ◽

Abutment Teeth ◽

Ceramic Crowns ◽

Solid Tissues

The article presents the results of evaluating the prototyping of metal-ceramic structures made by casting and selective laser sintering. To achieve this goal, 27 patients with fabricated metal-ceramic crowns and bridgeworks were examined. Two study groups were created. The first group included 14 patients for whom dental prosthesis frameworks were made by casting. The second group consisted of 13 people, for whom the frames of dentures were made by the method of selective laser sintering. The analysis of clinical effectiveness was carried out according to the following criteria: 1- precision of the felling of prosthesis frame to solid tissues of abutment teeth; 2- the condition of the marginal periodontium; 3- the integrity of the ceramic cladding. The results of the study showed that the precision to solid tooth tissues of metal-ceramic dental prostheses made by laser selective sintering is higher than of frames made by casting. In accordance to the second criteria the best results were also shown by the participants of the second group. No chipping of the ceramic veneer from the metal-ceramic denture frameworks made by laser selective sintering was found. Thus, dentures which frameworks are made by the method of selective laser sintering are characterized by a higher objective assessment of their precision to the solid tissues of the abutment teeth. Lesions of the marginal periodontium both inflammatory and dystrophic were less in the participants of the second group. The frequency of defects in the coating of metal-ceramic dentures was significantly lower in the case of fabrication frameworks by laser selective sintering.

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Precision of fit of two margin designs for metal-ceramic crowns

Primary Dental Care ◽

10.1308/135576108783328382 ◽

2008 ◽

Vol os15 (1) ◽

pp. 32-32

Author(s):

P Limkangwalmongkol ◽

GJ Chiche ◽

MB Blatz

Keyword(s):

Metal Ceramic ◽

Ceramic Crowns

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Evaluation of Zirconia-Ceramic Crowns Applied to Implants Placed in the Maxilla at Different Angles by Finite Element Stress Analysis

Journal of Ege University School of Dentistry ◽

10.5505/eudfd.2021.59389 ◽

2021 ◽

Vol 42 (3) ◽

pp. 191-198

Author(s):

Fatih Demirci ◽

Sedat Güven ◽

Samet Tekin

Keyword(s):

Finite Element ◽

Stress Analysis ◽

Zirconia Ceramic ◽

Finite Element Stress Analysis ◽

Ceramic Crowns ◽

Finite Element Stress

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Oral Rehabilitation of Severe Dentoalveolar Trauma: A Clinical Report

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-10-00121 ◽

2012 ◽

Vol 38 (6) ◽

pp. 757-761 ◽

Cited By ~ 2

Author(s):

Fonda G. Robinson ◽

Larry L. Cunningham

Keyword(s):

Clinical Examination ◽

Motor Vehicle ◽

Motor Vehicle Accident ◽

Clinical Report ◽

Oral Rehabilitation ◽

Endosseous Implants ◽

Vehicle Accident ◽

Metal Ceramic ◽

Dentoalveolar Trauma ◽

Ceramic Crowns

This clinical report describes the oral rehabilitation of an adult male who suffered severe dentoalveolar trauma as a result of a motor vehicle accident. The specific objectives of this treatment were to restore esthetics and masticatory function. Treatment included removal of fractured roots, placement of multiple endosseous implants, and placement of anterior and posterior metal-ceramic crowns and fixed partial dentures. Three year clinical examination revealed no pathology associated with the rehabilitation. The patient's esthetic and functional expectations were successfully achieved.

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