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J Korean Acad Conserv Dent. 2005 Nov;30(6):450-460. English. Original Article. https://doi.org/10.5395/JKACD.2005.30.6.450
Lee HJ , Kim JS , Lee SJ , Lim BS , Baek SH , Cho BH .
Department of Conservative Dentistry, School of Dentistry, Seoul National University, Korea. chobh@snu.ac.kr
Dental Research Institute, School of Dentistry, Seoul National University, Korea.
Department of Orthodontics, School of Dentistry, Seoul National University, Korea.
Department of Dental Biomaterials, School of Dentistry, Seoul National University, Korea.
Abstract

The aim of this study was to evaluate the effect of cavity shape, bond quality of bonding agent and volume of resin composite on shrinkage stress developed at the cavity floor. This was done by measuring the shear bond strength with respect to iris materials (cavity shape; adhesive-coated dentin as a high C-factor and Teflon-coated metal as a low C-factor), bonding agents (bond quality; Scotchbond(TM) Multi-purpose and Xeno(R)III) and iris hole diameters (volume; 1 mm or 3 mm in diameter x 1.5 mm in thickness). Ninety-six molars were randomly divided into 8 groups (2 x 2 x 2 experimental setup). In order to simulate a Class I cavity, shear bond strength was measured on the flat occlusal dentin surface with irises. The iris hole was filled with Z250 restorative resin composite in a bulk-filling manner. The data was analyzed using three-way ANOVA and the Tukey test. Fracture mode analysis was also done. When the cavity had high C-factor, good bond quality and large volume, the bond strength decreased significantly. The volume of resin composite restricted within the well-bonded cavity walls is also be suggested to be included in the concept of C-factor, as well as the cavity shape and bond quality. Since the bond quality and volume can exaggerate the effect of cavity shape on the shrinkage stress developed at the resin-dentin bond, resin composites must be filled in a method, which minimizes the volume that can increase the C-factor.

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