Radiographic inspection of porosity in pure titanium dumbbell castings

Autor(es)

Costa Nunez, Juliana Maria ^[1] ; Ferreira Koyama Takahashi, Jessica Mie ^[1] ; Pessanha Henriques, Guilherme Elias ^[1] ; de Arruda Nobilo, Mauro Antonio ^[1] ; Xediek Consani, Rafael Leonardo ^[1] ; Mesquita, Marcelo Ferraz ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Dept Prosthodont & Periodontol, Piracicaba Dent Sch, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: GERODONTOLOGY; v. 28, n. 3, p. 233-237, SEP 2011.
• Citações Web of Science: 3

Resumo

Radiographic inspection of porosity in pure titanium dumbbell castings Background: Titanium frameworks are frequently indicated for implant supported prostheses; however, voids are usually encountered inside cast titanium. Objective: This study aimed to confirm the efficacy of a radiographic technique for inspection of porosity in commercially pure titanium castings with different diameter. Materials and methods: Sixty dumbbell rods (n = 20) with a central 1.5, 2.0 and 3.5 mm diameter were prepared by lost-wax casting. Cast specimens were finished and polished and submitted to radiographic examination (90 kV, 15 mA, 0.6 s and 10-13 mm of distance) using periapical film. The radiographs were visually analysed for the presence of porosity in the extension of the dumbbell or in the central portion of the rods. Data were submitted to Pearson Chi-square test (5%). Results: The tested radiographic method proved to be suitable for the evaluation of cast frameworks. Internal porosities were observed in most of the specimens (91.7%) (p = 0.0005); however, only 20% occurred on the central portion of the rods (p = 0.612). Conclusion: Internal porosities can be visualised through radiographs and occur mostly in small diameter structures. The radiographic evaluation of metal structures can improve the quality of frameworks and thereby potentially increase the longevity of the rehabilitation. (AU)

• Processo FAPESP: 07/51306-1 - Resistência à fadiga: efeito da distância de soldagem a laser em estruturas de titânio comercialmente puro com diferentes diâmetros
• Beneficiário: Marcelo Ferraz Mesquita
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 06/58816-2 - Resistência à fadiga: efeito da distância de soldagem a laser em estruturas de titânio comercialmente puro com diferentes diâmetros
• Beneficiário: Juliana Maria Costa Nuñez-Pantoja
• Modalidade de apoio: Bolsas no Brasil - Mestrado