man ▁as ▁honor ary ▁consult ant ▁in ▁period ont ology . ▁He ▁stayed ▁there ▁until ▁he ▁retired ▁in ▁ 2 0 0 1 . ▁ ▁Wh ilst ▁at ▁U CH ▁and ▁the ▁East man , ▁Zam et ▁carried ▁out ▁several ▁research ▁projects . ▁In ▁ 1 9 7 4 ▁he ▁was ▁awarded ▁an ▁M Ph il ▁degree ▁by ▁the ▁University ▁of ▁London ▁for ▁his ▁dis sert ation , ▁A ▁Compar ative ▁C lin ical ▁Study ▁of ▁Three ▁Period ont al ▁S urg ical ▁techniques , ▁which ▁exam ined ▁clin ical ▁out comes ▁of ▁surg ical ▁period ont al ▁ther apy . ▁Other ▁research ▁was ▁carried ▁out ▁into ▁partic ulate ▁bi og lass ▁gra ft s . ▁ ▁In ▁ 1 9 6 6 , ▁Zam et ▁established ▁the ▁first , ▁and ▁for ▁many ▁years ▁the ▁only , ▁singular ly ▁period ont al ▁practice ▁in ▁London . ▁He ▁was ▁also ▁the ▁first ▁UK ▁period ont ist ▁to ▁particip ate ▁in ▁the ▁Br än emark ▁Os se o integration ▁Program me ▁in ▁Gö then berg . ▁This ▁programme ▁stem med ▁from ▁when , ▁in ▁ 1 9 5 2 ▁Per - In g var ▁Br ån emark ▁put ▁tit an ium - enc ased ▁optical ▁devices ▁into ▁the ▁legs ▁of ▁rabb its ▁to ▁study ▁the ▁he aling ▁process . ▁At ▁the ▁end ▁of ▁the ▁research ▁period , ▁after ▁removing ▁the ▁devices , ▁they ▁discovered ▁unexpected ly ▁that ▁the ▁tit an ium ▁had ▁f used ▁into ▁the ▁b one ▁and ▁could ▁not ▁be ▁removed . ▁He