Restor Dent Endod.  2021 Nov;46(4):e59. 10.5395/rde.2021.46.e59.

Comparative analysis of bond strength to root dentin and compression of bioceramic cements used in regenerative endodontic procedures

• Rodrigues MNM
• Bruno KF
• Alencar AHGd
• Silva JDS
• Siqueira PCd
• Decurcio DdA
• Estrela C

• KMID: 2548103
• DOI: http://doi.org/10.5395/rde.2021.46.e59

Abstract

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 pushout 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.

Keyword

Calcium silicate cement; Compressive strength; Dentin bond strength; Regenerative endodontics

Figure

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  Figure 1 Sample preparation for the push-out test: (A) Slices of Biodentine, MTA Repair HP, and Bio-C Repair with experimental cements after a storage period of 7 days; (B) Push-out test: specimen positioned on the metallic platform of a universal testing machine.

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  Figure 2 Compressive strength test: (A) Split matrix. (B) Model specimens made of composite resin. (C) Matrices made of condensed silicone and placed on a Petri dish or insertion of bioceramic cements. (D) Matrices after the insertion of MTA Repair HP cement. (E) Biodentine cement specimen. (F) Biodentine cement specimen positioned at the center of the compressive strength test device.

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  Figure 3 Box plot with the median, interquartile range, and maximum and minimum values of bond strength for the tested materials.

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  Figure 4 Illustrative photograph of the classification of the failure mode of bioceramic cements observed after the mechanical push-out test: (A) cohesive; (B) adhesive; (C) mixed.

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  Figure 5 Box plot with the median, interquartile range, and maximum and minimum values of compressive strength for the tested materials.

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