LST EN ISO 21563:2013 Dentistry - Hydrocolloid impression materials (ISO 21563:2013) has been changed from LST EN ISO 1564:2002 Dental aqueous impression materials based on agar (ISO 1564:1995).
LST EN ISO 21563:2013 Dentistry - Hydrocolloid impression materials (ISO 21563:2013) has been changed from LST EN ISO 13716:2002 Dentistry - Reversible-irreversible hydrocolloid impression material systems (ISO 13716:1999).
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