The effect of repeated porcelain firings on corrosion resistance of different dental alloys

Tunçdemir, Ali Rıza; Karahan, İsmail Hakkı; Polat, Serdar; Malkoç, Meral Arslan; Dalkız, Mehmet

doi:10.4047/jap.2013.5.1.44

Cited by 6 publications

(7 citation statements)

References 23 publications

(28 reference statements)

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“…The increase in corrosion rates corresponded well with the reduced Cr and Mo levels in the surface oxides of the fired alloys. These results were in consistence with other study, reporting that repeated firings decreased corrosion resistance of CrCo and CrNi alloys [5]. The above-mentioned studies support the results of the present paper [5,51].…”

Section: Discussionsupporting

confidence: 94%

Does Simulated Porcelain Firing Influence Corrosion Properties of Casted and Sintered CoCr Alloys?

2021

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The aim of the study was to evaluate how heat processing used for dental porcelain firing influences the surface properties of sintered and casted CoCr alloy. Two CoCr alloys, Soft Metal LHK (milling in soft material and sintering) and MoguCera C (casting), were used for the study. The samples were examined using SEM–EDS before and after heat treatment. Next, corrosion examinations (Ecorr, jcorr, polarization curve, Ebr) were performed. Finally, the samples were evaluated under SEM. Based on the results, the following conclusions might be drawn: 1. Thermal treatment (porcelain firing) did not cause chemical impurities formation on the surface of CoCr alloy; 2. The sintered metal exhibited significantly higher corrosion resistance than the casted one due to its homogeneity of structure and chemical composition; 3. Heat treatment (porcelain firing) decreased the resistance of casted and sintered CoCr alloy to electrochemical corrosion. The reduction in corrosion resistance was significantly higher for the casted alloy than for the sintered alloy; 4. The corrosion resistance decrease might be due to an increased thickness and heterogeneity of oxide layers on the surface (especially for the casted alloy). The development of corrosion process started in the low-density areas of the oxide layers; 5. The sintered metal seems to be a favourable framework material for porcelain fused to metal crowns.

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Section: Discussionsupporting

confidence: 94%

Does Simulated Porcelain Firing Influence Corrosion Properties of Casted and Sintered CoCr Alloys?

2021

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“…For sterilization, samples were placed in sodium hypochlorite for 5 minutes, and then they were kept in phosphate-buffered saline (PBS) with 0.02% thymol to inhibit bacterial growth until samples were used [ 31 ]. The samples were prepared as slices and then polished in order to satisfy the experimental requirements according to reported protocols [ 9 , 32 ]. A number of slices parallel to the occlusal surface were processed using a water-cooled low-speed diamond wheel saw model 650 (SBT INC., CA, USA).…”

Section: Methodsmentioning

confidence: 99%

“…Every slice thickness was 2 mm. For polishing, surfaces of a sample were mechanically polished using 1500 grit silicon carbide a wet sandpaper [ 32 ] before laser irradiation to increase the measurement accuracy. Finally, samples were cleaned for 10 minutes [ 33 ] in an ultrasonic bath to remove conjoined particles.…”

Section: Methodsmentioning

confidence: 99%

Data Fitting to Study Ablated Hard Dental Tissues by Nanosecond Laser Irradiation

et al. 2016

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Laser ablation of dental hard tissues is one of the most important laser applications in dentistry. Many works have reported the interaction of laser radiations with tooth material to optimize laser parameters such as wavelength, energy density, etc. This work has focused on determining the relationship between energy density and ablation thresholds using pulsed, 5 nanosecond, neodymium-doped yttrium aluminum garnet; Nd:Y3Al5O12 (Nd:YAG) laser at 1064 nanometer. For enamel and dentin tissues, the ablations have been performed using laser-induced breakdown spectroscopy (LIBS) technique. The ablation thresholds and relationship between energy densities and peak areas of calcium lines, which appeared in LIBS, were determined using data fitting. Furthermore, the morphological changes were studied using Scanning Electron Microscope (SEM). Moreover, the chemical stability of the tooth material after ablation has been studied using Energy-Dispersive X-Ray Spectroscopy (EDX). The differences between carbon atomic % of non-irradiated and irradiated samples were tested using statistical t-test. Results revealed that the best fitting between energy densities and peak areas of calcium lines were exponential and linear for enamel and dentin, respectively. In addition, the ablation threshold of Nd:YAG lasers in enamel was higher than that of dentin. The morphology of the surrounded ablated region of enamel showed thermal damages. For enamel, the EDX quantitative analysis showed that the atomic % of carbon increased significantly when laser energy density increased.

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“…Pd-Ag-based alloys, which are a substitute for Au-based metal-ceramic alloys, are generally composed of 50 to 60 wt% Pd, 30 to 40 wt% Ag, and some trace elements to facilitate bonding with porcelain. Pd-Ag-based alloys have a high modulus of elasticity, excellent bonding strength with porcelain, and stability against discoloration and corrosion [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Rate on Hardness and Phase Transformation of a Pd-Ag-Based Metal–Ceramic Alloy with or without Ice-Quenching

Shin

Kwon

Seol

2021

Metals

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The aim of this study was to investigate the effect of cooling rate on the hardness and phase transformation of a Pd-Ag-based metal–ceramic alloy with or without ice-quenching. A total of 28 test specimens, in an as-cast state, were fabricated. A multiple firing simulation was performed on the randomly selected specimens (n = 3/group) in a porcelain furnace; each firing was followed by cooling at the relatively low or high cooling rate. In addition, ice-quenching after oxidation was introduced before the normal firing process (n = 3/group). Microhardness, microstructure, phase transformation and elemental distribution were observed. Oxidation followed by ice-quenching allowed the alloy to be in a homogenized state. On the other hand, the oxidation-treated specimens followed by cooling at relatively high or low cooling speeds showed much higher hardness than the ice-quenched specimen after oxidation, which was resulted from the formation of the metastable precipitates based on the InPd3 phase with tetragonal structure. The hardness of ice-quenched alloy after oxidation was recovered in the very next firing step at both the relatively high and low cooling rates. In all specimens, the Pd-rich matrix and the InPd3-based precipitates were observed. The hardness of a Pd-Ag-based metal–ceramic alloy with and without ice-quenching depended on the cooling rate during the firing process.

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The effect of repeated porcelain firings on corrosion resistance of different dental alloys

Cited by 6 publications

References 23 publications

Does Simulated Porcelain Firing Influence Corrosion Properties of Casted and Sintered CoCr Alloys?

Does Simulated Porcelain Firing Influence Corrosion Properties of Casted and Sintered CoCr Alloys?

Data Fitting to Study Ablated Hard Dental Tissues by Nanosecond Laser Irradiation

Effect of Cooling Rate on Hardness and Phase Transformation of a Pd-Ag-Based Metal–Ceramic Alloy with or without Ice-Quenching

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