List of Articles by Author

1. Radnai M, Bereznai M, Pelseczi I, Toth Z, Turzo K, Bor Z, Fazekas A. Surface Modification of Titanium Dental Implants by Excimer Laser. Acta Stomatol Croat. 2002;36(3):324-5.
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   Title in English:	Surface Modification of Titanium Dental Implants by Excimer Laser
   Title in Croatian:	nema
   Type of Article:	congress abstract
   MeSH:	TITANIUM DENTAL IMPLANTS LASERS
   Abstract:	The perfect osseointegration process of the dental implants depends among other factors on the surfact characteristics of the titanium. In this study enlarged mechanical roughness was produced by a laser-based technique, in order to decrease the healing period of the implant. There are different ways of forming laser induced surfacestructures. In the case of mask projection techniques the surface can be modified in larger areas and surface patterns. An ArF nanosecond excimer laser was used in the experiments because of the advantageous properties of the excimer beams. Effective polishing by homogeneous laser illumination in the 3-5 J/cm2 fluence range was performed as confirmed by SEM and AFM studies. Holes of about20 mm diameter and 10 mm in depth, with high aspect ratio and protrusions around the edges were ablated into the titanium surface with subsequent pulses of ns ArF excimer laser. To avoid easily breakable protrusions we applied excimer pulse durations of 0.5 picoseconds. In this case we obtained melting- and ridge-free ablation of titanium. The laser treatment influenced the chemical composition of the surface in two respects. On the one hand itremoved carbonaceous contamination as indicated by XPS and XRD measurements, demonstrating that cleaning of the surface does not alter the original crystalline structure. On the other hand, XPS measurements proved that pulsed laser oxidation in air increased the thickness of the surface oxide layer, promoting better osseointegration.