RESUMO
Titanium dioxide (TiO2) thin films have generated considerable interest over recent years, because they are functional materials suitable for a wide range of applications. The efficient use of the outstanding functional properties of these films relies strongly on their basic characteristics, such as structure and morphology, which are affected by deposition parameters. Here, we report on the influence of plasma power and precursor chemistry on the growth kinetics, structure and morphology of TiO2 thin films grown on Si(100) by plasma-enhanced atomic layer deposition (PEALD). For this, remote capacitively coupled 13.56 MHz oxygen plasma was used to act as a co-reactant during the ALD process using two different metal precursors: titanium tetrachloride (TiCl4) and titanium tetraisopropoxide (TTIP). Furthermore, we investigate the effect of direct plasma exposure during the co-reactant pulse on the aforementioned material properties. The extensive characterization of TiO2 films using Rutherford backscattering spectroscopy, ellipsometry, x-ray diffraction (XRD), field-emission scanning electron microscopy, and atomic force microscopy (AFM) have revealed how the investigated process parameters affect their growth per cycle (GPC), crystallization and morphology. The GPC tends to increase with plasma power for both precursors, however, for the TTIP precursor, it starts decreasing when the plasma power is greater than 100 W. From XRD analysis, we found a good correlation between film crystallinity and GPC behavior, mainly for the TTIP process. The AFM images indicated the formation of films with grain size higher than film thickness (grain size/film thickness ratio ≈20) for both precursors, and plasma power analysis allows us to infer that this phenomenon can be directly related to the increase of the flux of energetic oxygen species on the substrate/growing film surface. Finally, the effect of direct plasma exposure on film structure and morphology was evidenced showing that the grid removal causes a drastic reduction in the grain size, particularly for TiO2 synthesized using TiCl4.
RESUMO
A prótese total sobre implantes é uma alternativa para pacientes totalmente edêntulos com rebordo ósseo que não proporciona retenção e nem estabilidade para uma prótese total convencional. A prótese implanto-suportada e implanto-retida é o tipo de prótese que os pacientes têm maior preferência, sendo uma das melhores formas de reabilitação para pacientes desdentados total, reestabelece a função mastigatória, deglutição e também a capacidade fonética, trazendo maior conforto e segurança para o paciente resultando em melhor qualidade de vida. O objetivo deste trabalho é mostrar uma técnica alternativa para reabilitação total superior com prótese total implanto-suportada cerâmica com infraestrutura de zircônia.
The total prosthetic implant is an alternative to edentulous patients with bone edge which does not provide retention and stability or for a conventional denture. The implant-supported and implant-retained prosthesis is the type of prosthesis that patients have more preferably, one of the best forms of rehabilitation for full edentulous patients, restores chewing, swallowing and also the phonetic capacity, providing greater comfort and safety to the patient resulting in improved quality of life. The objective of this work is to show an alternative technique for maxillary complete rehabilitation with implant-supported denture with ceramic zirconia infrastructure.
