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Bonding and Strength of Aggregate01:12

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The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
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Conventional vs. Ready-To-Use Bioceramic Cements: In Vitro Bond Strength Performance in Blood-Contaminated Dentine.

Gabriela Kato Bego1, Graziela Bianchi Leoni1, Elias Daniel Covas Rodrigues2

  • 1University of Ribeirão Preto - UNAERP, Ribeirão Preto, SP, Brazil.

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Summary
This summary is machine-generated.

Blood contamination negatively impacts dentine repair cement bond strength. Ready-to-use Bio C Repair showed better performance than Mineral Trioxide Aggregate (MTA) in contaminated conditions.

Keywords:
bioceramic materialsbloodbond strengthdentine

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Area of Science:

  • Endodontics
  • Biomaterials Science
  • Dental Materials

Background:

  • Dentine repair is crucial for endodontic treatment success.
  • Bioceramic cements like Mineral Trioxide Aggregate (MTA) and ready-to-use formulations (e.g., Bio C Repair) are used for dentine repair.
  • Blood contamination can compromise the bond strength and performance of dental cements.

Purpose of the Study:

  • To evaluate the bond strength of MTA and Bio C Repair in dentine repair under blood contamination.
  • To compare the performance of a conventional bioceramic cement (MTA) with a ready-to-use cement (Bio C Repair) when exposed to blood.
  • To assess the effect of delayed application on cement bond strength in contaminated environments.

Main Methods:

  • 120 bovine root dentine discs were used, divided into control and blood-contaminated groups.
  • Cements (MTA and Bio C Repair) were applied immediately or after a 15-min delay.
  • Push-out bond strength was measured using a universal testing machine.
  • Energy Dispersive X-ray Spectroscopy (EDS-X) and Scanning Electron Microscopy (SEM) were performed for analysis.

Main Results:

  • Bio C Repair exhibited significantly higher bond strength than MTA (p < 0.001).
  • Blood contamination significantly reduced bond strength for both cements compared to controls (p < 0.001).
  • A 15-min delay in application reduced bond strength only for Bio C Repair samples (p = 0.045).

Conclusions:

  • Blood contamination adversely affects the bond strength of both MTA and Bio C Repair.
  • Ready-to-use Bio C Repair demonstrates superior performance and potentially better handling characteristics in blood-contaminated dentine repair compared to MTA.
  • Minimizing delays in cement application is important, particularly for ready-to-use materials, to maintain optimal bond strength.