Abstract
The aim of this study was to evaluate the dentine bond strength of a novel fast-setting calcium silicate cement (Protooth) versus a calcium hydroxide-based cement (Dycal), a calcium silicate cement (ProRoot MTA), and a glass ionomer cement (Ketac-Molar). Mid-root dentine slices of 1mm thickness were obtained from human maxillary incisors. After enlarging the lumen of the canal to 1.3mm, the cavities were randomly filled with test materials. Samples were immersed in physiological-like solution. The push-out bond strength was tested on days 1, 28, and 180 (n=12). Failure types of bonding were determined using a stereomicroscope. We analysed the data using linear regression. Dycal and day 1 were considered as reference for cement type and assessment time, respectively. Protooth, Ketac-Molar, and ProRoot MTA demonstrated higher push-out bond strength than Dycal. The push-out bond strength in the Protooth group increased on day 28 and 180. The bond strength of Ketac-Molar was significantly reduced on day 28. Dycal showed a significant decrease in bond strength on day 180 compared with that on day 1 and 28. Mixed failure was the dominant failure type. Protooth bonding to dentine was increased with time, in contrast to that of ProRoot MTA, Dycal, and Ketac-Molar, as a function of time.
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