Elastic Impression Materials

	優點	缺點	建議使用	注意事項
Irreversible hydrocolloid	Rapid set	Poor accuracy and surface detail	Diagnostic casts	Pour immediately
	Straightforward technique		Not suitable for definitive casts
	Low cost
Reversible hydrocolloid	Long working time	Low stability	Multiple preparations	Pour immediately
	Hydrophilic	Low tear resistance	Problems with moisture	Use only with stone
	No custom tray required	Equipment needed
	Low cost
Polysulfide polymer
	容易灌模	Setting time長	Most impressions	Pour within 1hr. Allow 10 min to set
	Tear strength高	黏稠、味道不好
		一小時內需灌模
Condensation silicone
	Setting time短	穩定性差	Most impressions	Pour immediately
	方便操作	厭水性、難濕潤		Care to avoid bubbles when pouring
Addition silicone
	Setting time短	有些廠牌會釋放氫氣	Most impressions	Delay pour of some materials
	方便操作	厭水性、難濕潤		Care to avoid bubbles when pouring
	尺寸穩定性高	改良為較親水
	可用Automix
Polyether
	Setting time短	Working time短	Most impressions	Care not to break teeth when separating cast
	親水性佳	凝固後很硬
	尺寸穩定性高	會吸水膨脹
	可用Automix	拔模易斷裂