Commercially pure titanium implants with surfaces modified by laser beam with and without chemical deposition of apatite. Biomechanical and topographical analysis in rabbits

Abstract

It was concluded that the implants LS, HAB, and HABT presented physicochemical and topographical properties superior to those of AS and MS and favored the osseointegration process in the shorter periods. In addition, HAB showed the best results when compared with other surfaces.

In vivo evaluation of cp Ti implants with modified surfaces by laser beam with and without hydroxyapatite chemical deposition and without and with thermal treatment: topographic characterization and histomorphometric analysis in rabbits

“…Here, continuing our studies evaluating these modified implant surfaces, in which we have previously assessed LS, HAB, and HABT surfaces by means of biomechanical analysis [28], we aimed to evaluate the surfaces of commercially pure titanium implants (cp Ti) modified by laser beam (LS) with and without hydroxyapatite (HA) deposition by biomimetic method, without (HAB) and with heat treatment (HABT), comparing them with implants with surfaces modified by treatment with acid (AS) and with machined surface (MS) by means of histomorphometric analysis. The rational for this study is that implant surface treatment plays a major role in implant osseointegration.…”

“…The cp Ti implants were fixed at the rotating device under the pulsed laser equipment 20 W Yb (Ytterbium Pulsed Fiber Laser System Omnimark 20F, Ominitek Tecnologia Ltda, Sao Paulo, Brazil) with the parameters of nominal power and pulse rate of 140 mJ and 20 KHz, respectively. The laser beam was projected onto the entire surface of the implant threads in room atmosphere, as previously described [28].…”

“…The protocol was established following previous protocol [28]. Briefly, the samples were immersed in 50 mL of NaOH (5.0 mol/L) in the oven for a period of 24 h at 60°C for surface activation.…”

“…Another surface modification employed to accelerate implant osseointegration and favoring bone tissue interaction is surface coated with ceramic Ca-P [12,[27][28][29][30]. The Ca-P is released in the peri-implant region increasing the saturation of body fluid with consequent biological apatite precipitation on the implant surface.…”

“…Irradiation of the surface by laser beam prior to the chemical deposition of apatites by biomimetic method improves the physical-chemical bond stability between the coatings and implant surface. This is due to the formation of titanium oxides at the implant surface after irradiation with laser beam and its high affinity for Ca and P present in SBF [28,29,[45][46][47].…”