Physical Properties of Vinylpolysiloxane Impression Materials

0573 Physical Properties of Vinylpolysiloxane Impression Materials

L. HUYNH, D. XIE, and D. TOBIA, Kerr Corporation, Orange, CA, USA

Objective: The purpose of this study was to evaluate the physical properties of five vinylpolysiloxane impression materials with low and high viscosities in cartridges. Materials evaluated include Experimental Super Fast (Kerr), Aquasil Ultra Fast (Dentsply), Imprint II Garant Quick Step (3M/ESPE), Virtual Fast (Ivoclar) and Splash Half Time (Discus). Methods: Shore A hardness, tensile strength, tensile elongation and tear strength were tested (n=3) according to ASTM D2240, D412 (die C) and D624 (die C) respectively. The measurements were made approximately 1 hour after the specimens were prepared. The water contact angles were determined (n=3) using a Contact Angle Goniometer (Rame-Hart Inc) at 1 minute after placing a drop (2 m L) of distilled water on a horizontal surface of the cured material. Results:

Impression Materials

Shore A

Tensile Str.(MPa)

Elongation(%)

Tear Str.(kN/m)

Contact Angle(°)

Experimental Wash

48±1^a,d*

2.79±0.18^a

153±6^a

8.73±0.70^a

6±0.2^a

Aquasil Ultra XLV

52±0^b

5.42±0.12^b

95±2^b

7.29±0.04^b

5±0.1^a

Imprint II Garant LB

43±1^c

1.73±0.05^c

175±20^a

5.84±0.29^c

43±1^b

Virtual XLB

50±1^a,b

2.20±0.04^d

113±2^b

5.66±0.28^c

88±1^c

Splash XL Half Time

46±0^d

2.93±0.13^a

102±5^b

5.03±0.44^c

22±1^d

Experimental Tray

53±1^A

2.98±0.07^A

195±5^A

8.56±0.57^A

13±1^A

Aquasil Ultra HB

67±0^B

5.34±0.07^B

69±2^B

7.29±0.13^B

6±0.3^B

Imprint II Garant HB

67±0^B

2.93±0.06^A

64±3^B,C

5.54±0.23^C

73±1^C

Virtual Heavy Body

68±0^B

2.60±0.09^C

57±4^C

4.67±0.17^D

72±1^C

Splash Heavy Body

70±1^C

1.92±0.01^D

34±4^D

3.77±0.13^E

25±1^D

* Means with the same letters are not significantly different (p<0.05) within the same column.

Conclusions: Statistical analysis (ANOVA, p<0.05) showed that the experimental material had the highest tensile elongation (except for Imprint II LB) and tear strength among all tested materials. The experimental material and Aquasil Ultra had significantly lower contact angles than the other tested materials, indicating higher hydrophilicity.

Seq #78 - Composition, Physical Properties, and Fatigue
10:15 AM-11:30 AM, Thursday, 11 March 2004 Hawaii Convention Center Exhibit Hall 1-2

Back to the Dental Materials: VI - Polymer Materials-Mechanical Properties and Degradation Program
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