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ترمیمی: Reparability of Aged Silorane With Methacrylate-Based Resin Composite: Micro-Shear Bond Strength and Scanning Electron Microscopy Evaluation

 Reparability of Aged Silorane With Methacrylate-Based Resin Composite: Micro-Shear Bond Strength and Scanning Electron Microscopy Evaluation

Authors: L Giachetti *• D Scaminaci Russo 1• M Baldini 2• C Goracci 3• M Ferrari4

 *Luca Giachetti, MD, DMD, MSc, Tuscany School of Dental Medicine, University of Florence and Siena, Italy, Department of Public Health, Dentistry, University of Florence

 1-Daniele Scaminaci Russo, DDS, Tuscany School of Dental Medicine, University of Florence and Siena, Italy, Department of Public Health, Dentistry, University of Florence

 2-Matteo Baldini, DDS, Tuscany School of Dental Medicine, University of Florence and Siena, Italy, Department of Public Health, Dentistry, University of Florence

 3-Cecilia Goracci, DDS, MSc, PhD, Tuscany School of Dental Medicine, University of Florence and Siena, Italy, Department of Dental Materials and Fixed Prosthodontics, University of Siena

 4-Marco Ferrari, MD, DMD, PhD, Tuscany School of Dental Medicine, University of Florence and Siena, Italy, Department of Dental Materials and Fixed Prosthodontics, University of Siena

luca.giachetti@unifi.it


Abstract:


Clinical Relevance

 Aged silorane composite restorations can be repaired with a methacrylate-based resin composite by using a phosphate-methacrylate–based adhesive as the intermediate layer.

SUMMARY

 Objectives:

To evaluate the compatibility between aged siloranes and methacrylate-based composites by simulating a common

  repair-technique.

 Methods:

Twenty substrates were constructed using silorane (Filtek Silorane, 3M ESPE) and methacrylate composites (Filtek Supreme XT, 3M ESPE). Substrates were aged in 0.9% NaCl solution at 37°C for 72 hours. Silorane build-ups were constructed on silorane substrates without any intermediate layer (IL). Methacrylate build-ups were constructed on silorane substrates without any IL, with a methacrylate IL (Heliobond, Ivoclar Vivadent), or with a phosphate-methacrylate IL (Silorane System Adhesive Bond, 3M ESPE). Methacrylate build-ups were also constructed on methacrylate substrates without any IL. The micro-shear bond strength test was carried out after thermocycling. Bond strength data were statistically analyzed using analysis of variance and Tukey post hoc tests. Failure modes were assessed by means of scanning electron microscopy observations.

 Results:

 The silorane-methacrylate group without any IL showed the lowest bond strength values (0.4 ± 0.1 MPa). The use of a methacrylate-based IL (1.6 ± 1.7 MPa) led to a slight increase in bond strength, whereas the use of phosphate-methacrylate IL (9.1 ± 5.4 MPa) significantly increased bond strength. There was no statistically significant difference in bond strength between silorane-silorane (7.9 ± 3.6 MPa) and methacrylate-methacrylate (9.5 ± 4.1 MPa) groups without any IL.


Source: Operative Dentistry

  Full text

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