Surface and Biomechanical Study of Titanium Implants Modified by Laser With and Without Hydroxyapatite Coating, in Rabbits
Surface and biomechanical analysis of titanium implant surfaces modified by laser beam with and without hydroxyapatite. Titanium implants with 3 different surfaces were inserted into the tibias of 30 rabbits: group I (GI) machined surface (control group), group II irradiated with laser (GII), and group III irradiated with laser and hydroxyapatite coating applied—biomimetic method (GIII). Topographical analysis with scanning electron microscopy was made before surgery in the tibia. These rabbits were distributed into 2 periods of observation: 4 and 8 weeks postsurgery, after which biomechanical analysis (removal torque) was conducted. Statistical analysis used the Student-Newman-Keuls method. Surface showed roughness in GII and GIII. Biomechanical analysis demonstrated values with significant differences in GII and GIII. Titanium implants modified by laser irradiation can increase osseointegration during the initial phase.
Biomechanical analysis of removal torque of GI compared with GII and GIII at 4 and 8 weeks.
Figure 1. SEM GI: machined titanium implant surface. Figure 2. SEM GII: titanium implant surface modified by laser beam. Figure 3. SEM GIII: titanium implant surface modified by laser beam + hydroxyapatite.
X-ray diffraction results for the machined surface GI, laser surface GII, and laser + HA surface GIII.
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