1996b-169 appareilsetmatériel bibliography catalogs commercialastopic dental dentalequipment dentalhygiene dentalprophylaxis dentaltechnology dentisterie directory equipmentandsupplies hygiènedentaire instrumentation medicalinstrumentsandapparatus methods pharmaceuticalindustry programmedinstruction rootplaning surgicalinstruments technology wu113 wu113n6673f1996 wu150j44p