Hydrophilic Properties Of Commercial PVS Impression Materials

Hydrophilic Properties of Commercial PVS Impression Materials

C. LUU*, M. DURALI, L. HUYNH, and D. TOBIA (Kerr Corporation, Orange, CA, USA)

Objective: To compare hydrophilic characteristics of leading polyvinylsiloxane (PVS) impression materials by contact angle (CA) measurement during and after cure.

Methods: Four low viscosity PVS impression materials including Take 1 Adv FS LB (TA1, Kerr), Imprint 3 QS LB (IP3, 3M/ESPE), Aquasil Ultra FS LV (AQU, Dentsply), and Affinis Precious FS LB (AFF, coltene whaledent) were tested.  A Drop Shape Analysis System (DSA100, Kruss) equipped with a camera and software (DSA100S) was used. The impression materials were mixed and extruded onto a glass slide. For measurement during cure, a razor blade was used to scrape excess material and create a flat surface (~0.05mm thick). For after cure, material was extruded in between two glass slides to form a sample thickness of 2 mm.  The sample was allowed to fully cure according to the manufacturer suggested setting time.  A drop of 4 µL distilled water was carefully dispensed onto either the sample during cure or after cure. CA was measured at 1sec, 10sec, 30sec, and 60sec from the time of water droplet placement.

Results:

	Post Cure				During Cure
Time (s)	TA1	IP3	AQU	AFF	TA1	IP3	AQU	AFF
1	29(4)a	17(1)a	73(8)b	66(1)b	68(1)f	59(1)	75(1)	68(2)f
10	14(2)c	11(1)c	13(7)c	19(3)c	53(2)	39(1)	58(2)g	59(1)g
30	11(3)d	10(1)d	8(2)d	9(1)d	45(2)h	37(1)	54(1)	45(1)h
60	7(1)e	9(1)e	8(2)e	9(1)e	38(1)i	36(1)i	52 (1)	43(1)

Means with the same letter are not statistically different at p<0.05

Conclusion:  For post cure measurements; although, IP3 and TA1 showed greater hydrophilicity initially, all products dropped to low CA values at longer measurement times. Meanwhile, examination of the products during cure revealed IP3 and TA1 reached to the lowest CA values at 60 sec.