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Research Article
- Comparative analysis of bond strength to root dentin and compression of bioceramic cements used in regenerative endodontic procedures
- Maykely Naara Morais Rodrigues, Kely Firmino Bruno, Ana Helena Gonçalves de Alencar, Julyana Dumas Santos Silva, Patrícia Correia de Siqueira, Daniel de Almeida Decurcio, Carlos Estrela
- Restor Dent Endod 2021;46(4):e59. Published online November 9, 2021
- DOI: https://doi.org/10.5395/rde.2021.46.e59
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Abstract
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ePub Objectives This study compared the Biodentine, MTA Repair HP, and Bio-C Repair bioceramics in terms of bond strength to dentin, failure mode, and compression.
Materials and Methods Fifty-four slices obtained from the cervical third of 18 single-rooted human mandibular premolars were randomly distributed (
n = 18). After insertion of the bioceramic materials, the push-out test was performed. The failure mode was analyzed using stereomicroscopy. Another set of cylindrically-shaped bioceramic samples (n = 10) was prepared for compressive strength testing. The normality of data distribution was analyzed using the Shapiro-Wilk test. The Kruskal-Wallis and Friedman tests were used for the push-out test data, while compressive strength was analyzed with analysis of variance and the Tukey test, considering a significance level of 0.05.Results Biodentine presented a higher median bond strength value (14.79 MPa) than MTA Repair HP (8.84 MPa) and Bio-C Repair (3.48 MPa), with a significant difference only between Biodentine and Bio-C Repair. In the Biodentine group, the most frequent failure mode was mixed (61%), while in the MTA Repair HP and Bio-C Repair groups, it was adhesive (94% and 72%, respectively). Biodentine showed greater resistance to compression (29.59 ± 8.47 MPa) than MTA Repair HP (18.68 ± 7.40 MPa) and Bio-C Repair (19.96 ± 3.96 MPa) (
p < 0.05).Conclusions Biodentine showed greater compressive strength than MTA Repair HP and Bio-C Repair, and greater bond strength than Bio-C Repair. The most frequent failure mode of Biodentine was mixed, while that of MTA Repair HP and Bio-C Repair was adhesive.
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Original Article
- Effect of cavity shape, bond quality and volume on dentin bond strength
- Hyo-Jin Lee, Jong-Soon Kim, Shin-Jae Lee, Bum-Soon Lim, Seung-Ho Baek, Byeong-Hoon Cho
- J Korean Acad Conserv Dent 2005;30(6):450-460. Published online November 30, 2005
- DOI: https://doi.org/10.5395/JKACD.2005.30.6.450
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Abstract
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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™ Multi-purpose and Xeno®III) and iris hole diameters (volume; 1 mm or 3 mm in diameter × 1.5 mm in thickness). Ninety-six molars were randomly divided into 8 groups (2 × 2 × 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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