engleski

Cobalt, chromium and nickel ion release from the CO•CR•MO dental alloy dependent on polishing procedure

MATERIALS AND METHODS: CO•CR•MO ALLOY WAS CASTED AND AND ELECTROPOLISHED (EP) ; SOME SAMPLES HAD BEEN ADDITIONALLY MECHANICALY POLISHED USING ROTATING RUBBERS AND BRUSHES WITH POLISHING PASTE (MP). THE ROUGHNESS AND OTHER MORPHOLOGICAL FEATURES OF THE EP AND MP SURFACES WERE ASSESSED BY ATOMIC FORCE MICROSCOPE (AFM). THE EP AND MP SAMPLES WERE SOAKED IN PH 6.0 PHOSPHATE BUFFER (SALIVA), 3.5 PH PHOSPHATE BUFFER (ACID) AND PH 3.5 MIXTURE OF LACTIC, FORMIC AND ACETIC ACID (DENTOBACTERIAL PLAQUE), AND INCUBATED AT 37 0C FOR 7 DAYS. SIX SAMPLES OF EVERY SOLUTION WERE PREPARED. AAS-GF WAS USED FOR ANALYSIS OF THE RELEASED CO, CR AND NI. RESULTS: CO AND CR WERE RELEASED ; NI WAS NOT DETECTED. AFM REVEALED DIFFERENT MORPHOLOGICAL FEATURES IN EP AND MP SAMPLES WHERE Z RANGE WAS SIGNIFICANTLY HIGHER IN EP SAMPLES (P<0.05) ; THE ROUGHNESS (RMS AND RA VALUES) WERE SLIGHTLY REDUCED IN MP, WITHOUT STATISTICAL SIGNIFICANCE (P>0.05). THERE WAS ALSO NO SIGNIFICANT DIFFERENCE IN ION RELEASE BETWEEN EP AND MP POLISHING TREATMENTS (P>0.05). DISCUSSION: ALTHOUGH THERE WERE MORPHOLOGICALLY DIFFERENT FEATURES BETWEEN THE RESPECTIVE STANDARD EP AND ADDITIONAL MP SURFACES, THEY DID NOT SIGNIFICANTLY AFFECT THE DIFFERENCE IN CO AND CR ION RELEASE FROM THE CO•CR•MO DENTAL ALLOY. CONCLUSION: ADDITIONAL MECHANICAL POLISHING DOES NOT INFLUENCE ION RELEASE AND DOES NOT REDUCE OR ENHANCE THE RISK OF POSSIBLE METAL TOXICITY.

dental materials

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