Comparison of Micro-Shear Bond Strength between Silorane-Based Composite and Conventional Methacrylate-Based Composite to the Dentin of Primary Teeth

Bond strength between the restorative material and tooth structure is one of the major factors in the selection of restorative materials, which plays a key role in durable restoration and reducing microleakage. Considering the recent attention of researchers to low-shrinkage composites, the present study aimed to compare the micro-shear bond strength of silorane-based composite (P90) with the conventional methacrylate-based composite (Z250) to the dentin of primary teeth.
In this experimental study, 24 intact primary canines were selected. Two disks (thickness: 2 mm) were prepared from each tooth, and the samples were randomly divided into four groups (n=12). Composite resin cylinders (r=0.7) were adapted on each dentin surface, as follows: g1: (silorane bond system P90), g2: (etch silorane bond system P90), g3: (single bond Z250), g4: (etch single bond Z250). Afterwards, the samples were subjected to a micro-shear bond strength test until failure. Data analysis was performed using Tamhane’s T2 (P Statistically significant differences were observed between the four groups of g1, g2, g3, and g4. The highest bond strength was reported in the second group (etch silorane bond composite P90), while the third group (single bond Z250) had the lowest micro-shear bond strength compared to the other groups.
According to the results, silorane-based composite (P90) has higher micro-shear bond strength to the primary dentin compared to the methacrylate-based composite (Z250). Moreover, etching the surfaces could increase the bonding efficiency of P90 to the primary dentin.