title: Evaluation of titanium implants with surface modification by laser beam. Biomechanical study in rabbit tibias.
abstract: The purpose of the present study was to evaluate, using a biomechanical test, the force needed to remove implants with surface modification by laser (Nd:YAG) in comparison with implants with machined surfaces. Twenty-four rabbits received one implant with each surface treatment in the tibia, machined surface (MS) and laser-modified surface (LMS). After 4, 8 and 12 weeks of healing, the removal torque was measured by a torque gauge. The surfaces studied were analyzed according to their topography, chemical composition and roughness. The average removal torque in each period was 23.28, 24.0 and 33.85 Ncm for MS, and 33.0, 39.87 and 54.57 Ncm for LMS, respectively. The difference between the surfaces in all periods of evaluation was statistically significant (p < 0.05). Surface characterization showed that a deep and regular topography was provided by the laser conditioning, with a great quantity of oxygen ions when compared to the MS. The surface micro-topography analysis showed a statistical difference (p < 0.01) between the roughness of the LMS (R(a) = 1.38 +/- 0.23 microm) when compared to that of the MS (R(a) = 0.33 +/- 0.06 microm). Based on these results, it was possible to conclude that the LMS implants' physical-chemical properties increased bone-implant interaction when compared to the MS implants.
authors.affiliation: Department of Diagnosis and Surgery, School of Dentistry of Araraquara, São Paulo State University (UNESP), Araraquara, SP, Brazil.
authors.forename: Rafael Silveira
authors.initials: RS
authors.lastname: Faeda
authors.forename: Hewerson Santos
authors.initials: HS
authors.lastname: Tavares
authors.forename: Rafael
authors.initials: R
authors.lastname: Sartori
authors.forename: Antonio Carlos
authors.initials: AC
authors.lastname: Guastaldi
authors.forename: Elcio
authors.initials: E
authors.lastname: Marcantonio
mesh_terms: D055011:Ablation Techniques; D000704:Analysis of Variance; D000818:Animals; D001696:Biomechanical Phenomena; D003758:Dental Implantation, Endosseous / Q000379:methods*; D017268:Dental Prosthesis Retention; D020007:Implants, Experimental; D053844:Lasers, Solid-State / Q000627:therapeutic use*; D008855:Microscopy, Electron, Scanning; D016348:Osseointegration / Q000502:physiology / Q000528:radiation effects*; D011817:Rabbits; D013499:Surface Properties / Q000528:radiation effects; D013977:Tibia; D013997:Time Factors; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects; D019415:Torque; D014945:Wound Healing / Q000502:physiology / Q000528:radiation effects
chemical_list: D014025:Titanium