Avaliação do duplo ataque ácido em ligas de titânio para uso em implantes dentários

Abstract

Double acid etching is a well-established method of surface modification for implants, although there are few studies on its application in newly developed alloys. The topography and surface composition influence the long-term success of dental implants, favoring fixation and osseointegration. Titanium alloys β emerge as an alternative with low modulus of elasticity, high resistance to corrosion and better mechanical properties, in addition to being composed of biocompatible elements, if compared to the most commonly used alloys today, Ti (cp-grade 2) and Ti-6Al-4V. Promising new alloys based on niobium and tin have been researched. In the present research, the influence of the double acid etching process on Ti-xNb-ySn alloys (x= 35 and 42 and y= 0 and 2) only cold-deformed, cold-deformed and aged was studied. The samples were subjected to surface acid attack in two steps of different acids HCl, HNO3 and H2SO4). The surface roughness parameters were quantified by roughness meter, while topography was studied by scanning electron microscopy, and wettability was determined by the sessile drop method. The results revealed that the two-step acid treatment altered the topography, increasing the surface area and consequently the potential for osseointegration. Attack A (HCl and HNO3) was more efficient for alloys with lower niobium content, while attack B (HCl and H2SO4) stood out as the most balanced in terms of roughness, surface energy and topography. Attack D (HCl, HNO3 and H2SO4) proved to be less efficient.