Effects of airborne-particle abrasion, sodium hydroxide anodization, and electrical discharge machining on porcelain adherence to cast commercially pure titanium

Department of Prosthodontics, Faculty of Dentistry, University of Selcuk, Konya, Turkey.
Journal of Biomedical Materials Research Part B Applied Biomaterials (Impact Factor: 2.76). 07/2007; 82(1):267-74. DOI: 10.1002/jbm.b.30730
Source: PubMed


The aim of this study was to determine the effect of airborne-particle abrasion (APA), sodium hydroxide anodization (SHA), and electrical discharge machining (EDM) on cast titanium surfaces and titanium-porcelain adhesion. Ninety titanium specimens were cast with pure titanium and the alpha-case layer was removed. Specimens were randomly divided into three groups. Ten specimens from each group were subjected to APA. SHA was applied to the second subgroups, and the remaining specimens were subjected to the EDM. For the control group, 10 specimens were cast using NiCr alloy and subjected to only APA. Surfaces were examined by using scanning electron microscope and a surface profilometer. Three titanium porcelains were fused on the titanium surfaces, whereas NiCr specimens were covered with conventional porcelain. Titanium-porcelain adhesion was characterized by a 3-point bending test. Statistical analysis showed that the porcelain-metal bond strength of the control group was higher than that of the titanium-porcelain system (p < 0.05). There were no significant differences between the bond strengths of titanium groups (p 0.05), except the bond strengths of Noritake Super Porcelain TI-22 groups on which APA and SHA were applied (p < 0.05). SHA and EDM as surface treatment did not improve titanium-porcelain adhesion when compared to APA.

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    • "Considering these phenomena, various methods were proposed to improve the bond strength of the metal–ceramic system. Thus, various processes were used, such as alumina and silica airborne-particle abrasion process for increasing the roughness of the metallic parts [12] [13] [14], acid treatments and caustic baths to clean the contaminated surfaces after the heat treatments [15] [16] [17] [18], mechanical metallization [19] and anodizing [14] for generating additional metal and oxide layers, respectively, and laser etching for removing the excess oxides [20]. Other methods such as acceleration of the oxidation process during the preparation of metal substrate [14] [21] [22], or the use of bonding agents [23], of ceramic [24] or composite intermediate layers [25] were also reported. "
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    ABSTRACT: High bonding between the NiCr or CoCr alloys and the ceramic layer is essential for the clinical success of dental prostheses restorations. Aiming to enhance the bond strength between metal and dental ceramics in prosthetic restorations, TiSiN coatings were deposited as interlayers. The coatings were deposited on NiCr and CoCr dental alloys by using the cathodic arc technique at various substrate bias voltage values and characterized in terms of elemental composition, crystalline structure, mechanical properties, surface roughness and contact angle. The bond strength of the metal–ceramic system, with and without TiSiN interlayers, was evaluated by using a three-point bending test. The coatings consisted of nanocrystalline solid solutions (grain sizes of 3.6–4.3 nm) with a face-centered cubic structure. The film hardness, ranging from approximately 21 to 38 GPa, was observed to increase with increasing substrate bias, irrespective of the substrate type. The best adhesion values (critical loads of ~54 N) were obtained on both substrates for coatings deposited at of −100 V bias voltage. The deposition of the TiSiN coatings determined the roughness decrease of both NiCr and CoCr coated alloys. The contact angle measurements indicated a hydrophobic character for the films deposited at bias voltages ranging from −50 to −150 V and a hydrophilic character at a bias of −200 V. The results indicated that TiSiN coatings improved the bond strength of NiCr – ceramic systems. Based on these results it is expected an increase of the clinical service life of the dental restorations having a TiSiN interlayer between the metallic support and the ceramic layer.
    No preview · Article · Mar 2015 · Ceramics International
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    • "/1C respectively, which were very closed with each other [15]. The bond agents were considered to be responsible for the differences of bond strength mostly. "

    Full-text · Dataset · Jun 2014
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    • "/1C respectively, which were very closed with each other [15]. The bond agents were considered to be responsible for the differences of bond strength mostly. "
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    ABSTRACT: The effects of different brands' bond agents on the cpTi-porcelain bond strength was investigated in this study. The elemental composition and weight percentage of the three bond agents (Super Ti22, Duceratin Kiss, Titankeramik) for titanium were evaluated. The adhesion between titanium and porcelain with or without bond agent was measured by the three-point bending test. Then the cpTi-porcelain interfaces were characterized. All of the three bond agents were SiO2-based and mixed with different oxides. The bond strengths of Super Ti22 and Duceratin with bond agent were significantly higher than those without bond agent (p < 0.05). There was no statistical difference when Titankeramik bond agent was used (p > 0.05). The interfaces of Super Ti22 and Duceratin with bond agent were compact, while there were visible cracks and pores at the interfaces of the other groups. The results show that the bond agent can improve the cpTi-porcelain bond strength and may be suitable for clinical use.
    Full-text · Article · Oct 2013 · Materials Letters
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