Dental implants serve as a reliable treatment option for replacing missing teeth. The important properties for implant materials are, besides biocompatibility, adequate strength, corrosion, wear and fracture resistance. The most important step in the stability of the implant is a structural and functional connection between the implant's surface and the newly formed bone, which is called osseointegration. It comprises a cascade of complex physiological mechanisms. The implant's surface

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... istics and roughness are the most important in achieving the biomechanical concept of secondary stability. Nowadays, dental implants are produced from metals, ceramics or even polymers. Rehabilitations with titanium and titanium-alloy dental implants have shown long-term survival; therefore, they have become a gold standard to replace missing teeth. In the study we investigated new and retrieved dental implants and restorative materials, commercially pure titanium (cpTi), the Ti6Al4V alloy and CoCrMo alloys using light microscopy and scanning electron microscopy for the surface morphology and microstructure. Energy-dispersive spectroscopy was used for the chemical analyses. The results showed that the surfaces of the Ti and Ti6Al4V implants were roughened by corundum (Al2O3) blasting, and the corundum contamination was found not only on the surface but also in the sub-surface of the new and retrieved dental implants. It is assumed that the retained corundum Al2O3 contamination on the surface of the Ti or Ti-alloy affects the osseointegration and longevity of the dental-implant rehabilitation. Zobni vsadki slu'ijo kot zanesljiva metoda nadomestitve manjkajo~ih zob. Pomembne lastnosti materialov za zobne vsadke so biokompatibilnost, upogibna trdnost ter korozijska in obrabna odpornost. Stabilnost vsadka v kosti je omogo~ena zaradi procesa oseointegracije, ki pomeni strukturno in funkcionalno povezavo med povr{ino vsadka in novonastalo kostjo. Oseointegracija poteka preko kaskade zapletenih fiziolo{kih mehanizmov. Stabilnost zobnega vsadka je odvisna od povr{inske lastnosti in hrapavosti vsadka, kar zagotavlja dobro stabilnost v~eljustni kosti. Sodobni zobni vsadki so izdelani iz kovin, keramike ali celo polimerov. Zobni vsadki iz titana in njegove zlitine, predstavljajo zanesljivo oskrbo manjkajo~ih zob z visoko stopnjo pre'ivetja. V {tudiji smo preiskovali nove in odstranjene zobne vsadke ter material za proteti~no oskrbo, izdelane iz komercialno~istega titana -cpTi, zlitine Ti6Al4V in CoCrMo z metodami svetlobne mikroskopije, vrsti~ne elektronske mikroskopije za povr{insko morfologijo in mikrostrukturo ter energijske rentgenske disperzijske spektroskopije za kemijsko analizo. Rezultati prikazujejo delce korunda (Al2O3) na povr{ini titanovih vsadkov in vsadkov iz zlitine Ti6Al4V. Sledi kontaminacije s korundom so bile ugotovljene tudi v materialu pod povr{ino novih in odstranjenih zobnih vsadkov. Korund na povr{ini zlitine titanovih zobnih vsadkov lahko vpliva na proces oseointegracije in zmanj{a'ivljensko dobo zobnih vsadkov. Klju~ne besede: zobni vsadek, korund Al2O3, oseointegracija, vrsti~na elektronska mikroskopija, energijska rentgenska disperzijska spektroskopija