Physicochemical characterization of the titanium surface after surface treatment with 45S5 bioglass obtained from silica extracted from rice husk associated with niobium

• Grant number: 24/13038-0
• Support Opportunities: Scholarships in Brazil - Master
• Start date: April 01, 2025
• End date: April 30, 2026
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Luis Geraldo Vaz
• Grantee: Gabriel Gimenez Pedroso
• Host Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil

Abstract

The application of osseointegrated implants with modified surfaces is widely used in tooth replacement, with titanium being the most common material due to its physicochemical and biological properties capable of promoting bone formation effectively. In this context we find bioglasses such as Bioglass 45S5, which has demonstrated satisfactory osteoinductive potential, with positive results also being found regarding biocompatibility and bone formation from the doping of this bioglass with niobium. Given this situation, the main objective is to observe the physicochemical characteristics of the surface of commercially pure titanium associated with 45S5 bioglass doped with Niobium using the spraying technique developed for the study. In this way, the sustainable nature of the project stands out since the 45S5 bioglass will be synthesized from silica from rice husks and ash, of which Brazil is one of the largest producers in the world, in addition to the Niobium that the country has. around 95% of the world's reserves. 186 commercially pure titanium samples will be used, which will be randomly divided into: Group 1: No previous surface treatment; and Group 2: With previous surface treatment using aluminum oxide blasting and fixation with nitric and hydrofluoric acid. Within both groups there will be Control (C1 and C2) Bioglass Blasting Group (B1 and B2) Bioglass Blasting Group doped with Niobium (BN1 and BN2), and the bioglass blasting will be carried out using the ultrasound spraying technique. Three-dimensional roughness assessment will be carried out after treatments, using 3D laser scanning confocal microscopy. Vickers microhardness (VHN) will be measured using a digital microhardness meter after each treatment. Adhesion will be evaluated according to the ABNT M985 standard. The surface topography will be analyzed by field emission scanning electron microscopy (SEM-FEG) with three samples per group. X-ray diffraction will be performed using the energy dispersive X-ray spectroscopy (EDS) technique using a field emission scanning electron microscope (FEG-SEM). The wettability will be determined using a goniometer (Ramé-Hart 100-00, Succasunna, NJ, USA) using the sessile drop method. Except for the qualitative analysis of surface topography, all resulting data will be treated statistically using the most appropriate tests for each situation (±=0.05). (AU)