Title: Effect of cavity-configuration and thermo-cycling on adhesion of low-shrinking composite
Authors: Mine, Atsushi ×
De Munck, Jan
Van Landuyt, Kirsten
Poitevin, André
Kuboki, Takuo
Yoshida, Yasuhiro
Suzuki, Kazuomi
Van Meerbeek, Bart
Lambrechts, Paul #
Issue Date: Sep-2008
Publisher: Journal of Dental Research
Series Title: Journal of Dental Research vol:87 issue:submitted
Conference: the Pan European Federation of the International Association for Dental Research location:London date:10-12 Sep 2008
Abstract: Objectives: Polymerization shrinkage stress can impair bonding effectiveness, especially at the bottom of a high C-factor occlusal class-I cavity. The purpose of this study was 1) to evaluate the effect of a low-shrinking composite on the bonding effectiveness in a high polymerization shrinkage stress environment and 2) to evaluate the effect of thermo-cycling on these pre-stressed interfaces.

Methods: A new low-shrinking composite (els, Saremco) was bonded into standardized occlusal class-I cavities (4.5x4.5x2.5 mm) using a 3-step etch-and-rinse adhesive (cmf, Saremco). A 2-step etch-and-rinse adhesive (XP Bond, Dentsply) and a conventional composite (Z100, 3M ESPE) served as control. The restored teeth were subjected to 20,000 thermo-cycles or 3 weeks of water storage. Then, the teeth were sectioned to 1x1 mm sticks by an automated, water-cooled diamond saw (Accutom, Struers), of which the 4 central sticks were further processed for micro-tensile bond strength (μTBS) testing (5 teeth per group were used).

Results: 3-way ANOVA revealed a significant effect for the adhesive and composite (both p<0.0001), but no effect for thermo-cycling (p=0.994). mean ± SD (ptf/n)
20,000 thermo-cycles

26.2 ± 9.2 MPaa,b (0/20)
27.5 ± 9.2 MPaa (0/20)

16.3 ± 16.9 MPab,c,d (7/20)
20.3 ± 13.6 MPaa,b,c (1/20)

XP Bond/els
13.7 ± 12.1 MPac,d (3/20)
8.3± 10.5 MPad,e (9/20)

XP Bond/Z100
0.0 ± 0.0 MPae (20/20)
0.1± 0.4 MPae (19/20)

ptf = pre-testing failure = 0 MPa. Means with the same superscript are not statistically different (Turkey multiple comparisons, p<0.05).

Conclusion: The low-shrinking composite in combination with the 3-step etch-and-rinse adhesive provided the best bonding performance, even after thermo-cycling. The 2-step etch-and-rinse adhesive suffered strongly from polymerization shrinkage stress, which could be partially restored by using the low-shrinking composite.
ISSN: 0022-0345
Publication status: submitted
KU Leuven publication type: IT
Appears in Collections:Biomaterials - BIOMAT
Clinical Residents Dentistry
Department of Oral Health Sciences - miscellaneous
× corresponding author
# (joint) last author

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