Evaluation of surface characteristics of Ti-6Al-4V and Tilite alloys used for implant abutments

Abstract

The aim of this study was to evaluate surface free energy (SFE), surface roughness (SR) and surface hardness (SH) of two commercially available materials for fabricating dental implant abutments. In addition, the specimens were investigated by scanning electron microscopy (SEM) to determine the surface morphology. Twenty five discs (5 x 2 mm) of Ti-6Al-4V and Tilite (Ni-Cr-Ti) alloys were used in this study. Surface free energy was determined by the contact angle formed between a drop of distilled, deionized water and the surface of the specimen of each material. The surface roughness was measured with a mechanical profilometer and the surface hardness was evaluated by means of the Vickers hardness micro indentation test. SFE, SR and SH data were analyzed using one-way ANOVA (p < 0.05). Statistical differences (p < 0.05) were found between Ti-6Al-4V (36.2 erg x cm(-2); 0.2 microm) and Tilite (30.9 erg x cm(-2); 0.16 microm) for SFE and SR. However, the differences between the surface hardness values of Ti-6Al-4V (325.0 kg/mm(2)) and Tilite (324.3 kg/mm(2)) were not statistically significant (p > 0.05). Evaluations by SEM revealed different surface morphology. Within the limits of this study, it can be concluded that the Ti-6Al-4V and Tilite alloys showed differences in surface properties, except for surface hardness, suggesting that both alloys may be considered appropriate for producing abutments. Further studies are, however, necessary to elucidate the biological responses to implant abutments made with these alloys.

Mechanical behavior of NiCr and NiCrTi alloys for implant prosthetic components

“…The amount of γ'' depends on the chemical composition and temperature, as shown in the quaternary phase diagram [20]. The addition of Cr in the alloy forms Ni-Cr dendrites and is essential for oxidation resistance, due to the formation of a Cr-rich film, that is highly resistant to acid attack, while adding the molybdenum-based alloy NiCr increases resistance to localized corrosion [2,22]. These elements (Cr and Mo) are also enhancers, both in a solid solution γ and γ' phase [20].…”

Proposal for a new site to insertion of dental implants for osseointegration test: Research methodology

“…For two decades, the most significant aspects of implantology that were studied were related to osseointegration and the stability of marginal ridges. [1,2] These factors are still widely studied today, but biomechanics and function, [3] surface and anatomy of the implants, [4,5] esthetics, [6] and knowledge of risk factors, [7] are also studied. These features, in addition to increasing the quality of life for people [8] in need of dental implants, have delineated a new horizon in this promising area of research.…”

Avaliação histológica e histomorfométrica da energia superficial e molhabilidade em implantes de titânio grau IV e grau V: estudo experimental em coelhos

“…Quanto à aplicabilidade do titânio e sua liga na implantodontia, pode-se dizer que é visto em vários materiais de uso corriqueiro como instrumentais, implantes, parafusos de cobertura, mini-implantes ortodônticos e componentes protéticos, entre outros utilizados na odontologia (GIOKA et al, 2004;LIMA et al, 2006;PASTOR et al, 2008;SQUEFF et al, 2008;OLIVEIRA et al, 2009;MATHIEU et al, 2012;GALLI et al, 2012;SINGH et al,2012). A liga titânio alumínio vanádio é aproximadamente seis vezes mais forte do que o osso compacto, assim há a possibilidade de peças mais finas, como regiões finas de interconexões, lojas de parafusos de implantes, componentes protéticos, entre outros.…”

“…Porém, muitas indústrias vêm utilizando o titânio grau V como biomaterial em implantes depois de ser muito empregado em componentes protéticos. Os componentes protéticos entram em contato com a cavidade bucal após se integram ao implante, passando pela mucosa gengival, onde deve haver biocompatibilidade, adesão e estagnação de bactérias (LIMA et al, 2006). São confeccionados em ligas de titânio, Ti6Al4V, a qual além de ter menor custo, possui resistência a cargas superior ao titânio comercialmente puro.…”

“…Além do titânio e o titânio-alumínio-vanádio, outras ligas, Ni-Cr-Mo, Ni-Cr-Mo-Ti e a de Ni-Cr-Ti, são usadas e adequadas para confecção de abutments (LALITHAMMA et al, 2014;SARTORI et al, 2013;LIMA et al, 2006).…”