Resin-based composite materials are increasingly used as alternative to
amalgam for molar restorations. New types of composites such as 'Ormocers'
and highly filled 'Heavy Body (HB)' composites as well as compomers have
been introduced to the dental profession; another resin-based composite
(InTen-S®, Ivoclar-Vivadent Corp.) has been developed recently with
improved properties, such as reduced polymerization time of 10 seconds
and decreased shrinkage.
Objectives: Determination of flexural strength (
FS-3,
3-point bending, n=10, according to ISO 24049:1999;
FS-4, 4-point
bending, n=10), elastic modulus (
EM), and Vickers hardness (
HV)
of InTen-S® (
IN), compared to different types of restoratives:
Tetric® Ceram HB (
TC), Heliomolar® HB (
HM), Solitaire®
2 (
SO), Definite® (
DE; Ormocer), and Dyract® AP (
DY;
Compomer).
Methods: Specimens (25 x 2 x 2 mm ³) were
prepared according to manufacturers´ instructions and stored for
24 hours in aqua dest at 37°C to determine FS and EM, using a three-
resp. four-point-bending device (Zwicki). Surface hardness was measured
by means of a Vickers Hardness Tester after 24 hours.
Results:
(mean, SD)
|
IN |
TC |
HM |
SO |
DE |
DY |
| FS-3 [MPa] |
107.4 (6.8) |
130.5 (9.2) |
98.9 (7.5) |
117.6 (4.3) |
101.0 (13.4) |
108.7 (14.6) |
| FS-4 [MPa] |
84.4 (9.2) |
96.6 (11.8) |
83.4 (11.6) |
99.1 (9.9) |
84.4 (10.1) |
78.6 (12.6) |
| EM[GPa] |
8.3 (0.5) |
9.7 (0.6) |
5.3 (0.4) |
9.1 (0.5) |
8.9 (0.2) |
7.5 (1.1) |
| HV 0.5 |
54.5 (1.4) |
70.4 (1.3) |
36.1 (1.0) |
58.9 (0.4) |
75.7 (1.9) |
54.6 (0.5) |
TC shows the significantly highest value for FS-3,
TC and
SO exhibit significantly higher values for FS-4;
HM shows
the lowest value for Vickers hardness, statistically significant compared
to all tested materials (Data analyzed by One-way ANOVA, mod. LSD test
p<.05).
Conclusions: Results show competitive data of a new
composite (IN), compared to commercially available composites and a compomer.
(Study supported by Ivoclar-Vivadent Corp., Schaan, Principality of Liechtenstein)
