title: Application of porous titanium in prosthesis production using a moldless process: Evaluation of physical and mechanical properties with various particle sizes, shapes, and mixing ratios.
abstract: The prosthetic applications of titanium have been challenging because titanium does not possess suitable properties for the conventional casting method using the lost wax technique. We have developed a production method for biomedical application of porous titanium using a moldless process. This study aimed to evaluate the physical and mechanical properties of porous titanium using various particle sizes, shapes, and mixing ratio of titanium powder to wax binder for use in prosthesis production. CP Ti powders with different particle sizes, shapes, and mixing ratios were divided into five groups. A 90:10wt% mixture of titanium powder and wax binder was prepared manually at 70°C. After debinding at 380°C, the specimen was sintered in Ar at 1100°C without a mold for 1h. The linear shrinkage ratio of sintered specimens ranged from 2.5% to 14.2%. The linear shrinkage ratio increased with decreasing particle size. While the linear shrinkage ratio of Groups 3, 4, and 5 were approximately 2%, Group 1 showed the highest shrinkage of all. The bending strength ranged from 106 to 428MPa under the influence of porosity. Groups 1 and 2 presented low porosity followed by higher strength. The shear bond strength ranged from 32 to 100MPa. The shear bond strength was also particle-size dependent. The decrease in the porosity increased the linear shrinkage ratio and bending strength. Shrinkage and mechanical strength required for prostheses were dependent on the particle size and shape of titanium powders. These findings suggested that this production method can be applied to the prosthetic framework by selecting the material design.
authors.affiliation: Department of Oral and Maxillofacial Prosthodontics and Oral Implantology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan.
authors.forename: Widyasri
authors.initials: W
authors.lastname: Prananingrum
authors.affiliation: Oral Implant Center, Tokushima University Hospital, Tokushima, Japan. Electronic address: tomotake.dent@tokushima-u.ac.jp.
authors.forename: Yoritoki
authors.initials: Y
authors.lastname: Tomotake
authors.affiliation: Oral Implant Center, Tokushima University Hospital, Tokushima, Japan.
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Naito
authors.affiliation: Department of Biomaterials and Bioengineering, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan.
authors.forename: Jiyoung
authors.initials: J
authors.lastname: Bae
authors.affiliation: Department of Biomaterials and Bioengineering, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan.
authors.forename: Kazumitsu
authors.initials: K
authors.lastname: Sekine
authors.affiliation: Department of Biomaterials and Bioengineering, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Hamada
authors.affiliation: Department of Oral and Maxillofacial Prosthodontics and Oral Implantology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan.
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Ichikawa
mesh_terms: D008422:Materials Testing; D010316:Particle Size; D016062:Porosity; D019736:Prostheses and Implants; D014025:Titanium / Q000737:chemistry*
chemical_list: D014025:Titanium