Fatigue performance of joints executed in pure titanium structures with several diameters

Author(s)

Costa Nunez-Pantoja, Juliana Maria ^[1] ; Vaz, Luis Geraldo ^[2] ; de Arruda Nobilo, Mauro Antonio ^[1] ; Mesquita, Marcelo Ferraz

Affiliation

^[1] Univ Campinas UNICAMP, Piracicaba Dent Sch, Dept Prosthodont & Periodontol, BR-13414903 Piracicaba, SP - Brazil

^[2] State Univ Sao Paulo Julio de Mesquita Filho, Araraquara Dent Sch, Dept Dent Mat & Prosthodont, Araraquara, SP - Brazil

• Document type: Journal article
• Source: DENTAL MATERIALS JOURNAL; v. 30, n. 6, p. 887-893, NOV 2011.
• Web of Science Citations: 4

Abstract

This study evaluated fatigue strength of CP-Ti laser-welded joints. Sixty (20/diameter) CP-Ti casted dumbbell rods with diameters of 1.5, 2.0, and 3.5 mm were sectioned and welded using two joint openings (0.0 (00) and 0.6 mm (06)). Six groups were formed, amounting to a total of 9 (n=10) with inclusion of intact groups. Welding was executed using 360 V/8 ms (1.5 and 2.0 mm) and 380 V/9 ins (3.5 mm). Joints were finished, polished, and submitted to radiographic examination to visually analyze presence of porosity (PP). Specimens were submitted to cyclic tests, and the number of cycles until failure (NC) was recorded. Fractured surfaces were examined by SEM. Kruskal-Wallis and Dunn (alpha=0.05) tests demonstrated that NC was lower for all diameters with 06, and for 3.5 mm/00. NC and PP were found to have a negative correlation (Spearman Coefficient). For CP-Ti frameworks with thin diameters, laser welding is better when structures are juxtaposed. (AU)