J Adv Prosthodont.  2017 Feb;9(1):57-66. 10.4047/jap.2017.9.1.57.

The effect of repeated bonding on the shear bond strength of different resin cements to enamel and dentin

• Bulut AC
• Atsü SS

• KMID: 2368213
• DOI: http://doi.org/10.4047/jap.2017.9.1.57

Abstract

PURPOSE
Cementation failures of restorations are frequently observed in clinical practice. The purpose of this study is to compare the effect of initial and repeated bonding on the bond strengths of different resin cements to enamel and dentin.
MATERIALS AND METHODS
Ninety human maxillary central incisors were bisected longitudinally. The 180 tooth halves were divided into 2 groups (n = 90) for enamel and dentin bonding. The enamel and dentin groups were further divided into 3 groups (n = 30) for different resin cement types. Composite resin (Filtek Ultimate) cylinders (3 × 3 mm) were prepared and luted to enamel and dentin using Variolink II (Group V), RelyX ARC (Group R), or Panavia F 2.0 (Group P) resin cement. After 24 hours, initial shear bond strengths of the resin cements to enamel and dentin were measured. Using new cylinders, the specimens were de-bonded and re-bonded twice to measure the first and the second bond strengths to enamel and dentin. Failure modes and bonding interfaces were examined. Data were statistically analyzed.
RESULTS
Initial and repeated bond strengths to enamel were similar for all the groups. The first (15.3 ± 2.2 MPa) and second (10.4 ± 2.2 MPa) bond strengths to dentin were significantly higher in Group V (P<.0001). Second bond strengths of dentin groups were significantly lower than initial and first bond strengths to dentin (P<.0001).
CONCLUSION
All resin cements have similar initial and repeated bond strengths to enamel. Variolink II has the highest first and second bond strength to dentin. Bond strength to dentin decreases after the first re-bonding for all resin cements.

Keyword

Shear strength; Dental bonding; Enamel; Dentin; Resin cements

MeSH Terms

Cementation
Dental Bonding
Dental Enamel*
Dentin*
Humans
Incisor
Resin Cements*
Shear Strength
Tooth
Resin Cements

Figure

• 

  Fig. 1 Scanning electron microscope image (×1000 magnification) of (A) the initial enamel bonding, (B) the first enamel re-bonding and (C) the second enamel re-bonding of a sample in Group V. Note similar resin penetration patterns for the initial bonding and the re-bondings. E = Enamel, RC = Resin Cement.

• 

  Fig. 2 Scanning electron microscope images (×1000 magnification) of Group R. (A) the initial enamel bonding, (B) the first enamel re-bonding and (C) the second enamel re-bonding. Note that there are no significant differences among initial bonding, and the first and second enamel re-bondings. E = Enamel, RC = Resin Cement.

• 

  Fig. 3 Scanning electron microscope images (×1000 magnification) of (A) the initial enamel bonding, (B) the first enamel re-bonding and (C) the second enamel re-bonding of a sample in Group P. Note similar resin penetration patterns for the initial bonding and re-bondings. E = Enamel, RC = Resin Cement.

• 

  Fig. 4 Scanning electron microscope images (×1500 magnification) of Group V. Note (A) the resin tags (indicated by arrows) and contact of the resin cement with the dentin at the initial bonding, and (B) the first re-bonding. Note (C) the gap between the dentin and the resin cement (indicated by white arrows) and the diminished number of the resin tags at the second dentin re-bonding. D = Dentin, RC = Resin Cement, HL = Hybrid Layer, TG = Resin Tag.

• 

  Fig. 5 Scanning electron microscope images (×1500 magnification) of Group R bonded to dentin showing contact of resin cement with resin tags (indicated by arrows ) at (A) the initial bonding, and (B) the first re-bonding. Note (C) the discontinuities of the hybrid layer (indicated by white arrows) between the dentin and the resin cement at the second dentin re-bonding. D = Dentin, RC = Resin Cement, HL = Hybrid Layer, TG = Resin Tag.

• 

  Fig. 6 Scanning electron microscope images (×1500 magnification) of Group P. Note contact of resin cement with the dentin and resin tags (indicated by arrows) at (A) the initial bonding, and (B) the first re-bonding. Note (C) the gaps and discontinuity of the hybrid layer (indicated by white arrows) and the diminished number of resin tags at the second dentin re-bonding. D = Dentin, RC = Resin Cement, HL = Hybrid Layer, TG = Resin Tag.

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