[Table/Fig-7]:

Comparison of dimensional accuracy of group II casts (premolar site) with master model using three types of impression trays.

Group I		Group II	Premolar
			Bucco-lingual		Mesio-distal
			Mean ± SD	Difference	Mean ± SD	Difference
Group II Heavy +Light Body	IIA Metal Dual Arch	Mean ± SD % difference P value	4.196± 0.010 - -	0.008± 0.010 0.2% 0.04, S	3.254± 0.019 - -	0.013± 0.019 0.4% 0.06, NS
	IIB Plastic Dual Arch	Mean ± SD % difference P value	4.170± 0.047 - -	0.034± 0.047 0.8% 0.05, S	3.209± 0.072 - -	0.058± 0.072 1.8% 0.03, S
	IIC Custom Tray	Mean ± SD % difference P value	4.196± 0.010 - -	0.007± 0.010 0.2% 0.06,NS	3.257± 0.026 - -	0.010± 0.026 0.3% 0.25,NS
	ANOVA F P	IIA/IIB/IIC	-	2.82 0.08,NS	-	3.47 0.04,S
	(Difference In Accuracy Amongst Various Tray Groups)	IIA-IIB IIA-IIC IIB-IIC	- - -	0.12,NS 1.0,NS 0.11,NS	- - -	0.09,S 0.99,NS 0.05,S

*Anova test