Ugradnja Lantanida u caklinu ljudskih zuba

Abstract

The incorporation of lanthanides in human dental enamel was investigated by means o f X-ray microprobe analysis. Sound human premolar teeth - after extraction-were prepared and kept for 60 days in 10% solutions of neodymium-, samariumeuropium-, ytterbium resp. lanthanum-chloride at room temperature with constant shaking. Results of the X-ray microprobe analysis revealed 100-140 m depth penetration and incorporation o f neodymium, with transformation o f the apatite phases of enamel into neodymium-hydroxil-apatite-, resp. neodymium- hidrochlor-apatite. The changes were accompanied by a decrease in the values o f calcium, magnesium and sodium. Samarium- , ytterbium-, europium and lanthanum-chloride treatments produced a phosphate-complex containing coherent layer on the enamel surface. However, no real incorporation into the apatite-lattice was observed. The incorporation o f neodymium-apatites, and the formation of cerium-apatite into the dental enamel observed in previous studies might indicate the possibility of stabilizing the apatite structure, and discovering new ways of caries prevention.U radu je istraživana ugradnja lantanida u humanu caklinu zuba s pom oću rendgenske mikroanalize.Zdravi ljudski prem olari su poslije vađenja priprem ljeni i držani kroz 60 dana u 10% otopinama neodijsamarij, iterbij i lantanij klorida na sobnoj tem peraturi uz trajno m iješanje. Rezultati rendgenske m ikroanalize objelodanili su i potvrdili prodor i ugradnju neodija, s preobrazbom apatita cakline u neodij - -hidroxil-apatit. Promjene su bile praćene smanjenjem vrijednosti kalcija, magnezija i kalija. Samarij, iterbij, europij i lantanij klorid u postupku su uzrokovali stvaranje kompleksa fosfata stvarajući čvrst sloj na caklinskoj površini. M eđutim, prava ugradnja u caklinsku strukturu nije primijećena. Inkorporacija neodij apatita i stvaranje cerij apatita, što je bilo prim ijećeno u prethodnim studijama, moglo bi ukazivati na mogućnost stabilizacija apatitne strukture i otkriće novih putova prevencije karijesa