00329pam a2200121 a 4500020000500000041000500005082001700010100001900027245007700046250000900123260005400132300002100186  c  h  a617.632bGEH  aGehrig ,eJSN.  aFoundations of Periodontics for the Dental Hygienist hTextual Documents  a2nd.  aPhiladelphiabLippincott Williams & Wilkinsc2007  a518:c27.5x21.5.