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Related Experiment Videos

Marginal hybrid layer in Class V restorations.

C Prati1, D H Pashley, S Chersoni

  • 1University of Bologna, School of Dentistry, Department of General Dentistry, Via San Vitale 59,40125 Bologna, Italy.

Operative Dentistry
|February 24, 2001
PubMed
Summary

The hybrid layer's thickness and porosity varied significantly among bonding systems at the CEJ. Incomplete resin infiltration of collagen fibrils at the cervical margin may compromise the durability of dental restorations.

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Area of Science:

  • Dental Materials Science
  • Restorative Dentistry
  • Biomaterials

Background:

  • The hybrid layer is crucial for the micromechanical retention of adhesive restorations.
  • Understanding hybrid layer morphology at the cementoenamel junction (CEJ) is vital for long-term restoration success.
  • Variability in bonding systems may influence hybrid layer formation and integrity.

Purpose of the Study:

  • To evaluate the morphology and thickness of the marginal hybrid layer at the CEJ of Class V restorations.
  • To compare the effects of different bonding systems and post-etching treatments on hybrid layer formation.
  • To assess the impact of noninfiltrated collagen on the sealing capability of dental adhesives.

Main Methods:

  • Class V restorations were prepared in vitro on extracted third molars at the CEJ.

Related Experiment Videos

  • Three bonding systems (Scotchbond 1, Scotchbond MP, Clearfil Liner Bond 2V) were used.
  • SEM analysis was performed after treatment with phosphoric acid and/or NaOCl gel to evaluate hybrid layer morphology and thickness.

    • Main Results:

    • Scotchbond MP and Scotchbond 1 exhibited marginal hybrid layer thicknesses of 1.5-2.5 microns.
    • Clearfil Liner Bond 2V showed a variable hybrid layer thickness (0.0-12.0 microns) with increased porosities, especially after NaOCl treatment.
    • Enamel margins lacked a hybrid layer in all tested groups.

    Conclusions:

    • Collagen fibrils at the CEJ are not completely infiltrated by adhesive resin, irrespective of the bonding system.
    • Incomplete infiltration and porosities in the hybrid layer may compromise the sealing ability of the restoration.
    • The findings suggest potential long-term durability issues for Class V restorations at the CEJ due to inadequate hybrid layer formation.