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Restoration interface microleakage using one total-etch and three self-etch adhesives.

S Deliperi1, D N Bardwell, C Wegley

  • 1Tufts University School of Dental Medicine, Boston, MA, USA. simone.deliperi@tufts.edu

Operative Dentistry
|April 13, 2007
PubMed
Summary

This study compared dental adhesives for microleakage. The i-Bond self-etch adhesive showed significantly more dye penetration, indicating higher microleakage compared to other tested dental adhesives.

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Area of Science:

  • Dental Materials Science
  • Restorative Dentistry
  • Adhesive Dentistry

Background:

  • Microleakage is a significant concern in restorative dentistry, potentially leading to secondary caries and pulpal inflammation.
  • Dental adhesives are crucial for achieving a seal between the tooth structure and restorative material, preventing microleakage.
  • Evaluating the microleakage of different adhesive systems under simulated intraoral conditions is essential for clinical success.

Purpose of the Study:

  • To evaluate and compare the efficacy of a total-etch adhesive and three self-etch adhesives in reducing microleakage.
  • To assess the performance of these adhesives after prolonged water storage and thermocycling, simulating clinical aging.
  • To determine if there are significant differences in microleakage between occlusal and gingival margins for each adhesive system.

Main Methods:

  • Thirty human premolars and molars underwent Class V preparations and were restored with resin composite using four different adhesive systems: Xeno III (one-step self-etch), Prime & Bond NT (total-etch), i-Bond (one-step self-etch), and Clearfil SE Bond (two-step self-etch).
  • Restored teeth were stored in distilled water for 90 days and subjected to 500 cycles of thermocycling between 5°C and 55°C.
  • Microleakage was assessed using 0.5% methylene blue dye penetration, with samples sectioned and evaluated under a stereomicroscope at 20x magnification.

Main Results:

  • The i-Bond one-step self-etch adhesive demonstrated significantly greater dye penetration at both occlusal and gingival margins compared to the other groups (p < 0.0001).
  • No significant difference in microleakage was observed between occlusal and gingival margins for Xeno III, Prime & Bond NT, and i-Bond adhesives.
  • Clearfil SE Bond showed significantly more dye penetration at the occlusal margin than at the gingival margin (p = 0.001).

Conclusions:

  • The i-Bond one-step self-etch adhesive exhibited the poorest sealing ability among the evaluated systems, suggesting a higher risk of microleakage in clinical applications.
  • Clearfil SE Bond, a two-step self-etch adhesive, demonstrated acceptable performance but with a tendency for more leakage at the occlusal margin.
  • Further research may be warranted to optimize self-etch adhesive formulations and application techniques to minimize microleakage and enhance the longevity of dental restorations.