Effect of low-shrinking composite on the bonding effectiveness of two adhesives in occlusal Class-I cavities.
The purpose of this study was to evaluate if a low-shrinking composite can improve the bonding effectiveness of adhesives in highly constrained conditions. A low-shrinking composite ('els-extra low shrinkage', Saremco) was bonded in standardized occlusal Class-I cavities using a three-step ('cmf', Saremco) and a two-step etch-and-rinse adhesive ('XP Bond', Dentsply). Both adhesives were also combined with a conventional composite ('Z100', 3M ESPE). Half of the restored cavities were exposed to 20,000 thermo-cycles. 3-way ANOVA revealed a significant effect for the factors 'adhesive' and 'composite' (both p<0.0001), but not for 'thermo-cycling' (p=0.994). Significantly higher bond strengths were recorded for the low-shrinking composite than for the control composite, using either of the adhesives. The low-shrinking composite in combination with the three-step etch-and-rinse adhesive performed best in the high C-factor Class-I cavity. The two-step etch-and-rinse adhesive suffered strongly from polymerization-shrinkage stress, which could be partially restored by using the low-shrinking composite.
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-Facial Surgery, Catholic University of Leuven, Leuven, Belgium. amine@md.okayama-u.ac.jp
Atsushi
A
Mine
Jan
J
De Munck
Marcio V
MV
Cardoso
Kirsten L
KL
Van Landuyt
André
A
Poitevin
Takuo
T
Kuboki
Yasuhiro
Y
Yoshida
Kazuomi
K
Suzuki
Bart
B
Van Meerbeek
D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000145:classification*; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D006801:Humans; D008422:Materials Testing; D058105:Polymerization; D019904:Polymethyl Methacrylate; D012044:Regression Analysis; D019279:Resin Cements; D033081:Shear Strength; D016019:Survival Analysis; D013718:Tensile Strength
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements; C532387:XP-Bond; C035124:CMW cement; D019904:Polymethyl Methacrylate