Effect of different high-palladium metal-ceramic alloys on the color of opaque and dentin porcelain

Stavridakis, Minos; Dent, Dr Med; Papazoglou, Efstratios; Seghi, Robert R.; Johnston, William M.; Brantley, William A.

doi:10.1016/j.prosdent.2004.05.001

Cited by 34 publications

(24 citation statements)

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“…The drawback of such restorations is increased light reflectivity due to opaque porcelain layer. 27,28 All-ceramic crowns permit greater light transmission through the crown and can mimic natural tooth appearance in terms of color, surface texture, and translucency. [29][30][31] Nevertheless, variations in translucency in core material in a restoration may influence the final optical outcome.…”

Section: Introductionmentioning

confidence: 99%

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Effects of surface-finishing protocols on the roughness, color change, and translucency of different ceramic systems

Akar

Pekkan

Çal

et al. 2014

The Journal of Prosthetic Dentistry

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STATEMENT OF PROBLEM Surface-finishing protocols have a mechanical impact on ceramic surfaces that could eventually affect surface topography and light scattering. An optimum protocol is needed to avoid damaging the optical properties of ceramics. PURPOSE The purpose of this study was to determine the effects of different surface-finishing protocols on the surface roughness, color change, and translucency of ceramic and metal ceramic restorations. MATERIAL AND METHODS Standardized disk-shaped specimens (1.5 × 10 mm, n=128) were fabricated from 3 different ceramic core materials (aluminum oxide [Al2O3]-AL, zirconium oxide [ZrO2]-ZR, lithium disilicate [Li2Si2O5]-LIT), veneered (V) with dentin ceramics (n=32 per group), and placed in the following groups: ALV, ZRV, and LITV. The metal ceramic group acted as the control (n=32). Four different surface-finishing methods were tested. Airborne-particle abrasion with 50 m Al2O3, polishing with adjustment kit, polishing with adjustment kit plus diamond polishing paste, and autoglazing (n=8 subgroup) were applied on the veneering ceramics. The specimens were analyzed with a profilometer for surface roughness, and color change and translucency were measured with a clinical spectrophotometer. Statistical analyses were performed with 1-way ANOVA and the Tukey honest significant difference tests (=.05). RESULTS Specimens treated with the airborne particle abrasion method showed significantly higher mean profilometer for surface roughness values in all groups (P<.05). The polishing with adjustment kit and autoglazing methods revealed statistically similar surface roughness values in all groups (P>.05). With the diamond polishing paste method, lower surface roughness values were achieved in the ZRV and metal ceramic groups acted as the control groups. Different surface-finishing methods affected the color change of the ceramic systems, except for ZRV. Surface-finishing protocols significantly affected the translucency values of the ALV, LITV, and metal ceramic groups (P<.05). CONCLUSIONS No single surface-finishing protocol can be recommended to obtain the smoothest surface and the least color change without affecting translucency for the ceramics tested. The airborne-particle abrasion protocol created rougher surfaces and decreased translucency, and color change in zirconia was not affected by the finishing protocols. Purpose. The purpose of this study was to determine the effects of different surface finishing protocols on the surface roughness, color change and translucency of all-ceramic and metalceramic restorations. Materials and methods.Standardized disc-shaped specimens (1.5 mm x 10 mm, N=128)were fabricated using three different all-ceramic core materials (Al 2 O 3 -AL, ZrO 2 -ZR, Li 2 Si 2 O 5 -LIT) materials and veneered (V) with dentin ceramics (n=32 per group) constituting the following groups: ALV, ZRV, LITV. Metal-ceramic group acted as the control (MC) (n=32). Four different surface finishing methods were tested: Air-borne particle abrasion (AB) with 5...

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Section: Introductionmentioning

confidence: 99%

“…39,40 A color difference of 2 ∆E units has been described as an acceptable clinical shade match in dentistry, whereas color differences above 3.5 ∆E units are considered unacceptable and are visually detectable. 28 The ultimate goal in achieving an accurate color match is to achieve ΔE values lowest possible.…”

Section: Introductionmentioning

confidence: 99%

Effects of surface-finishing protocols on the roughness, color change, and translucency of different ceramic systems

Akar

Pekkan

Çal

et al. 2014

The Journal of Prosthetic Dentistry

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“…Under intraoral conditions the limit to clinical acceptability will be in the range of $2.8-3.7 DE units. [28][29][30] Considering that a DE value of more than 3.7 is regarded as a clinically detectable color difference, mean DE grade in the present study were easy to identify under intraoral conditions, which were more than 8.0 DE units (Table IV). Thus, it was definite and reliable to determine RB staining results according to the present shade guide.…”

Section: Discussionmentioning

confidence: 60%

Rose bengal staining in detection of oral precancerous and malignant lesions with colorimetric evaluation: A pilot study

Chen

et al. 2007

Intl Journal of Cancer

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Early detection of oral precancerous and malignant lesions is still a diagnostic challenge for most of clinicians, and ideal adjuncts for detection of these lesions are currently unavailable. Our preliminary study has indicated that rose bengal (RB) staining might have the potency as a diagnostic aid; however, its clinical significance and reliability in hospital-based population are still not clear. In the present study, we investigated the efficacy of RB staining in detection of oral precancerous and malignant lesions. RB staining was conducted in 132 patients, and staining results were determined by a 4-graded shade guide, which had been quantitatively measured in the 1976 CIEL*a*b* space by instrumental colorimetry. Histological examination was performed in 128 of 132 patients after RB staining. The sensitivity and specificity to detect epithelial dysplasia (DP) and oral squamous cell carcinoma were 93.9 and 73.7%, respectively. The positive and negative likelihood ratios were 3.570 and 0.082, respectively. Moreover, RB staining seemed promising to detect DP in oral leukoplakia, lichen planus and leukokeratosis. In this study, 5 of 6 DP or oral squamous cell carcinoma were identified by RB staining before histological examination. In conclusion, RB staining may be a valuable diagnostic test in detection of oral precancerous and malignant lesions. ' 2007 Wiley-Liss, Inc.Key words: rose bengal; early detection; oral squamous cell carcinoma; epithelial dysplasia; colorimetry It was estimated that cancer of the head and neck, including all oral, laryngeal and pharyngeal sites, is the fifth most common cancer, accounting for about 615,000 new cases annually. 1 About 40% of head and neck malignancies are known to be squamous cell carcinomas (SCCs) arising in the oral cavity, 1 and it has one of the lowest survival rates, 50%, within a 5-year period. 2 These survival rates have remained relatively unchanged for the past 3 decades, probably because of late recognition of the disease. Consequently, emphasis has been placed on early detection and diagnosis of precancerous lesions and early stages of oral cancer. Nevertheless, oral epithelial lesions have many different presentations, such that clinical variants require diagnostic tests beyond visual examination to obtain definitive diagnoses. [3][4][5] Adjuncts for detection of lesions and selection of biopsy sites include toluidine blue staining, exfoliative cytology and other recently emerging techniques. But because of various reasons, such as less effective when used in oral precancerous lesions, inevitably bewildered when equivocal results occurred, 4,6 these techniques have not been accepted all over the world at present.Rose bengal (RB), the 4,5,6,7-tetrachloro-2 0 ,4 0 ,5 0 ,7 0 -tetraiododerivative of fluorescein, has been widely used to diagnose various ocular surface disorders. 7 It has been believed to stain desquamated ocular epithelial cells, dead or degenerated cells but not healthy epithelial cells, or wherever there is poor protection of the surface e...

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“…Taking into account the criteria of ∆E* > 3.6 as the acceptable level of color difference 15,16 above mentioned, Table 6 evidences that many of the experimental samples fit the requirements needed for approval as potential coating material in dental prosthesis application.…”

Section: Potential Application Of the Pigmentsmentioning

confidence: 94%

“…The CIELab method can also be used for evaluation of the instrumental tolerance (∆E*) or the range of clinically acceptable color difference between the prosthesis and the natural tooth color of a patient 15 . This analysis is accomplished by applying Equation 1, presented below:…”

Section: Potential Application Of the Pigmentsmentioning

confidence: 99%

Production and characterization of colored feldspathic enamel for dental application

et al. 2014

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In this work we synthesized pigments capable of developing dental shades when mixed with dental porcelain and fired at appropriate temperatures. TiO2-xCeO2 pigments (x = 2, 6, 10, 13 and 18 mol%) were synthesized by the Pechini method. Characterization by thermal analysis revealed the stability of the material at temperatures up to 1200 °C. X-ray diffraction showed stable crystalline phases (rutile to TiO2 and cerianite to CeO2) for all pigments studied. Color of pigments was characterized by colorimetric coordinates according to the CIELAB method and reflectance measurements in the visible region. Through colorimetric analysis it was possible to verify the potential use of these pigments in dental ceramics.

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Effect of different high-palladium metal-ceramic alloys on the color of opaque and dentin porcelain

Cited by 34 publications

References 24 publications

Effects of surface-finishing protocols on the roughness, color change, and translucency of different ceramic systems

Effects of surface-finishing protocols on the roughness, color change, and translucency of different ceramic systems

Rose bengal staining in detection of oral precancerous and malignant lesions with colorimetric evaluation: A pilot study

Production and characterization of colored feldspathic enamel for dental application

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