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Quintessence Publishing: Journals: JAD

 

The Journal of Adhesive Dentistry

Edited by Jean-François Roulet

ISSN (print) 1461-5185 • ISSN (online) 1757-9988

Publication:

Fall 1999
Volume 1 , Issue 3



Pages: 243-253
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Shear Bond Strengths Attained In Vitro with Light-Cured Glass lonomers vs Composite Adhesives in Bonding Ceramic Brackets to Metal or Porcelain.

Jost-Brinkmann, Paul-Georg; Böhme, Andreas

Purpose: The aim of this in vitro study was to evaluate whether light-cured resin-modified glass ionomers provide sufficient bond strength for bonding ceramic brackets to metal and porcelain. In addition, the effect of mechanically retentive vs. silanized bracket bases on shear bond strength was investigated. Materials and Methods: Flat specimens made from amalgam, a precious metal alloy, or ceramic were air-abraded with Al2O3 for 3 s and subsequently bonded with either Transcend 6000 or Fascination ceramic brackets. Alternatively, 20 porcelain specimens were treated with 9.6% HF for 2 min. Fuji Ortho LC and Photac Bond (light-cured glass ionomer cements [GIC]) served as adhesives. Two composite adhesives (Concise orthodontic and Transbond) in combination with various conditioners formed the control groups. After water storage for 24 hours, the shear bond strengths of all specimens were determined. Results: Taking 10 MPa as a clinically sufficient bond strength, both resin-modified GICs produced a reliable retention of Transcend 6000 brackets on ceramic and amalgam, while the silanized Fascination brackets yielded a lower shear bond strength. On the precious metal alloy, only Fuji Ortho LC showed adequate strength. Various composite-conditioner combinations produced higher maximum bond strengths than the GICs. The location of bond failure varied considerably, and with most adhesives, bracket fractures occurred occasionally under shear stress. Conclusion: The investigated light-cured GICs provide sufficient strength for bonding ceramic brackets, but in terms of bond failure site and bracket fracture, they provide no advantage over composite adhesives.

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