Comparison Study Between Two Different Mixing Ratios of Polyethers

Objectives: To compare the properties of a hand-held (ExpIg/Garant)  2:1 ratio experimental polyether material versus the automix  (Impregum Penta Quick-Soft) 5:1 ratio material .

Methods: The properties of two fast-setting 3M ESPE polyether impression materials were tested. Test groups: Group 1 - Experimental (ExpIG/Garant); Group 2- Impregum Penta Quick-Soft (IPSQ).  The following nine experiments were conducted on each group according to the norms of the International Organization for Standardization (ISO) :

1.Consistency (CO)

2.Detail reproduction (DR)

3.Linear dimensional change (LC)

4.Compatibility with gypsum (CG)

5.Recovery from deformation (RD)

6.Strain in compression (SC)

 (Tests measured according to ISO4823:2000)

7.Shore hardness after 24 hours according to DIN53505

8.Tensile strength (TS) and

9.Elongation at break (EL) according to DIN53504.

Results: Data were analyzed by 2-sample t-test. Mean values (standard deviation) are shown in the table below.

* Statistically different (p<0.05)

Both materials passed their respective testing requirements for DR and CG methods.

 

	CO (mm)	LC (%)	RD (%)	SC (%)	SHORE A 24 h	TS (MPa)	EL (%)
n	5	6	5	5	6	Penta = 9 Garant=8	Penta=9 Garant=8
IPSQ (Penta)	36.2 (0.9)	-0.36 (0.046)	98.35 (0.094)	2.71 (0.101)	55.50 (1.049)	2.01 (0.149)	299.3 (35.66)
ExpIG (Garant)	35.1 (0.82)	-0.30 (0.066)	98.49 (0.108)	2.73 (0.076)	58.83 (1.169)*	2.16 (0.99)*	281.8 (23.71)
P value	0.08	0.09	0.06	0.78	<0.001	0.03	0.25

Conclusions: The Experimental Group 1 (2:1 dispenser material) showed no statistical differences from Group 2 (Penta 5:1) material with two exceptions: Group 1 showed improved TS and higher levels of Shore hardness. Partially sponsored by 3M ESPE