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D. NGUYEN, Kerr Corporation, Orange, CA, USA, and C. ANGELETAKIS, Kerr Corporation, Orange, CA, USA Objective : To evaluate the physical properties of a new low shrinkage translucent composite with high polish-retention along with commercial translucent composites. Methods: Physical properties of Kerr Translucent Experimental Composite (EXP) and comparable commercial materials were measured. Opacity was determined as the contrast ratio on 1 mm dia. X 20 mm disks using a spectrophotometer (X-Rite Inc., SP64). Flexural strength was measured according to ISO 4049. Polymerization shrinkage was measured via a volumetric (buoyancy) method. Gloss was measured (ASTM D-523) after abrasion with 600 grit sandpaper on samples 3x20x28 mm using a Leco grinder and polisher. Results: All four composites show no significant difference in flexural strength and opacity. However, the EXP composite showed the lowest volumetric shrinkage value of 1.92 % and highest gloss value of 37.7%.
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Manufacturer |
Kerr |
Dentsply |
Ultradent |
Ivoclar |
|
Composite |
EXP |
Esthet-X |
Vit-l-escence |
Four Seasons |
|
Shade |
Translucent |
W-E |
Pearl Frost |
Enam. Hi-Value |
|
Opacity |
48.9 |
47.9 |
48.2 |
46.8 |
|
Flexural Str. (MPa) (sd) |
125 (9)a |
136 (22)a |
128 (17)a |
132 (9)a |
|
% Vol. shrinkage (sd) |
1.92 (0.06) |
2.90 (0.09) a,b |
3.09 (0.01) a,c |
2.89 (0.20) b,c |
|
Gloss (sd) |
37.7 (0.3) |
18.9 (1.4) |
10.4 (0.2) |
28.4 (0.9) |
Means with the same letter are not statistically different at p<0.05
Conclusion: The Kerr Experimental Translucent Composite exhibits lower shrinkage and higher gloss retention with comparable flexural strength to commercial composites of same opacity range. |