Machinability of an experimental Ti-Ag alloy in terms of tool life in a dental CAD/CAM system

Inagaki, Ryoichi; Kikuchi, Masafumi; Takahashi, Masatoshi; Takada, Yukyo; Sasaki, Keiichi

doi:10.4012/dmj.2015-014

Cited by 11 publications

(7 citation statements)

References 14 publications

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“…Few studies comparing the fit of multi-unit FDPs with Co-Cr alloys and different CAD-CAM techniques have been published [7,34,57,58]. These studies are focused on the speed of machining, costs, etc.…”

Section: Resultsmentioning

confidence: 99%

Influence of the CAD-CAM Systems on the Marginal Accuracy and Mechanical Properties of Dental Restorations

Padrós¹,

Giner

Herrero-Climent³

et al. 2020

IJERPH

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The aim of this study was to compare the quality of different computer-assisted-design and computer assisted manufacturing systems (CAD-CAM) generated by only one scanner, focusing on vertical fit discrepancies and the mechanical properties. A master model was obtained from a real clinical situation: the replacement of an absent (pontic) tooth, with the construction of a fixed partial denture on natural abutments with three elements. Nine scans were performed by each tested and 36 copies were designed using a dental CAD-CAM software (Exocad). The frameworks were manufactured using three-axis and five-axis, with the same batch of the chrome-cobalt (CrCo) alloy. The frameworks were not cemented. A focus ion beam-high resolution scanning electron microscope (FIB-HRSEM) allowed us to obtain the vertical gap measurements in five points for each specimen. Roughness parameters were measured using white light interferometry (WLI). The samples were mechanically characterized by means of flexural tests. A servo-hydraulic testing machine was used with a cross-head rate of 1 mm/min. One-way ANOVA statistical analysis was performed to determine whether the vertical discrepancies and mechanical properties were significantly different between each group (significance level p < 0.05). The overall mean marginal gap values ranged: from 92.38 ± 19.24 µm to 19.46 ± 10.20 µm, for the samples produced by three-axis and five-axis machines, respectively. Roughness was lower in the five-axis machine than the three-axis one, and as a consequence, the surface quality was better when the five-axis machine was used. These results revealed a statistically significant difference (p < 0.005) in the mean marginal gap between the CAD-CAM systems studied. The flexural strength for these restorations range from 6500 to 7000 N, and does not present any statistical differences’ significance between two CAD-CAM systems studied. This contribution suggests that the number of axes improves vertical fit and surface quality due to the lower roughness. These claims show some discrepancies with other studies.

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Section: Resultsmentioning

confidence: 99%

Influence of the CAD-CAM Systems on the Marginal Accuracy and Mechanical Properties of Dental Restorations

Padrós¹,

Giner

Herrero-Climent³

et al. 2020

IJERPH

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“…The precipitated secondary phase may act as a local brittle zone similar to the concept of inclusions in free-machining materials 10) . This hypothesis is also applicable in the case of Ti-Ag alloys 4,11) and Ti-Zr alloys 12) . Ternary titanium alloys which are a combination of binary Ti-Nb and Ti-Cu alloys, may exhibit higher strengh and better grindability.…”

Section: Introductionmentioning

confidence: 83%

“…Since Titanium, Ti-6Al-4V or Ti-6Al-7Nb are difficult-to-machine, making adjustments or polishing of dental prostheses is difficult. Currently, significant and fast evolution is taking place in dental CAD/CAM systems, that would make it possible for metallic dental prostheses be made using dental CAD/CAM in the near future in spite of the known difficulty in processing titanium using CAD/CAM 4) . Improved machinability of titanium is still a highly desirable quality, in addition to the special cutting tool for titanium and its alloys that has already been developed 5) .…”

Section: Introductionmentioning

confidence: 99%

Construction of Ti-Nb-Ti<sub>2</sub>Cu pseudo-ternary phase diagram

2020

Self Cite

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The aim of this study was to construct a Ti-Nb-Cu ternary phase diagram that plays the role of a map for developing new titanium alloys with excellent machinability and mechanical properties. Fifteen experimental Ti-Nb-Cu ternary alloys composed of Ti-5-30%Nb-2-20%Cu were designed, and ingots made using Ar-arc melting furnace before casting to generate specimen. The alloy castings were evaluated in terms of their microstructures and alloy phases. A Ti-Nb-Ti2Cu pseudo-ternary phase diagram was constructed using X-ray diffractmetry results. Three alloy phases (α-Ti, β-Ti and Ti2Cu) were established within the specimen. Furthermore, the prescence of two-phase coexistence regions (α+Ti2Cu, α+β and β+Ti2Cu), and three-phase coexistence region (α+β+Ti2Cu) was noted. The findings obtained through microstructural observation corresponded well with the constructed phase diagram.

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“…The fabrication of titanium prostheses was improved after the application of dental CAD/CAM system and this provided high precision and this improved clinical outcomes [34,35]. As stated in a recent review, In vitro efficiency of ceramic-titanium restorations is considerably satisfactory to suggest as a treatment option [35], although there are limited data currently available on the clinical outcome of CAD/CAM-fabricated ceramic-titanium prostheses [39].…”

Section: Discussionmentioning

confidence: 99%

Influence of Various Laser Surface Modifications on SBS of Titanium and Zirconium Oxide Substructures

Saygın¹,

Özdemir²,

Görler³

2017

Cumhuriyet Science Journal

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In prosthodontics, to increase the bonding of metals with porcelain by several means including laser surface treatments is still an important research topic. The current study was undertaken to evaluate the influence of surface treatment with Ho:YAG, Er:YAG, and Nd:YAG lasers on the shear bond strength (SBS) of low fusion dental porcelain to titanium and zirconium oxide substructures. Titanium (n=70) and zirconium oxide (n=70) specimens were categorized into 7 study groups (n=10): sandblasting, Er:YAG 1.5W and 2.5W, Nd:YAG 1.5W and 2.5W, and Ho:YAG 4W and 10W. Their surface morphology was examined with under scanning electron microscopy (SEM) after surface treatment. After application of low fusion dental porcelain, the SBS test was performed applying a universal testing machine. In the titanium specimens, the SBSs of the Nd:YAG laser 2.5W and 1.5W were significantly higher than those of the sandblasting and other lasers, respectively (p<0.05); In the zirconium oxide specimens, the SBSs of the sandblasting, Nd:YAG 1.5W and Nd:YAG 2.5W lasers were significantly higher than those of the other lasers, respectively (p<0.05); In the titanium specimens, Er:YAG 1.5W, Nd:YAG 2.5W, and Ho:YAG 10W lasers provided significantly higher SBSs compared to those in the zirconium oxide specimens (p<0.05). To increase SBS of low fusion porcelain with titanium and zirconium oxide substructures, Nd:YAG laser is more successful compared to Er:YAG and Ho:YAG lasers. The laser applications provide different SBS results although there are no obvious differences among their surfaces by SEM; this requires further research in order to clarify the mechanism of these differences.

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Machinability of an experimental Ti-Ag alloy in terms of tool life in a dental CAD/CAM system

Cited by 11 publications

References 14 publications

Influence of the CAD-CAM Systems on the Marginal Accuracy and Mechanical Properties of Dental Restorations

Influence of the CAD-CAM Systems on the Marginal Accuracy and Mechanical Properties of Dental Restorations

Construction of Ti-Nb-Ti<sub>2</sub>Cu pseudo-ternary phase diagram

Influence of Various Laser Surface Modifications on SBS of Titanium and Zirconium Oxide Substructures

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