Journal Article

Shear bond strength of a new polycarbonate bracket—an in vitro study with 14 adhesives

Nilgun Akin-Nergiz, Ibrahim Nergiz, Kerstin Behlfelt and Ursula Platzer

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 18, issue 1, pages 295-301
Published in print January 1996 | ISSN: 0141-5387
e-ISSN: 1460-2210 | DOI:
Shear bond strength of a new polycarbonate bracket—an in vitro study with 14 adhesives

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Shear bond strength and failure location were used to evaluate the effectiveness of plastic bracket primers for bonding diacrylate adhesives on a new fibre-reinforced poly-carbonate bracket.

Maxillary incisor polycarbonate and mesh-based brackets as control were bonded to human incisors with 14 different adhesives (four filled diacrylate two-paste, six diacrylate one-step and four powder-liquid acrylic adhesives), and after thermo-cycling for 2000 cycles between 5° and 55°C, tested in shear. A non-parametric test (Mann-Whitney U test) was used to compare the shear bond strength of the polycarbonate brackets with the mesh based brackets and a One-way test (according to Scheffe) to compare the shear bond strength of different adhesives. The following conclusions can be made:

1. Seven of the 14 adhesives used in this study with both types of brackets demonstrated adequate shear bond strength values for the clinical application. The exceptions were: Achieve Mix, No-Mix: 30 Silkon, Lee Insta-Bond, Ortho-Loc and Bond-Eze, all with too low a shear bond strength for one or both types of brackets, and finally Quasar, which used with the plastic brackets sometimes caused enamel fractures, due to a very high bond strength.

2. The adhesives with their own plastic primer demonstrated higher bond strength values than those without plastic primer, and two-paste adhesives used with plastic primer displayed a higher bond strength than the other adhesives.

3. Generally, the shear bond strength values of the one-step adhesives were lower compared with the two-paste adhesives.

4. The liquid-powder adhesives demonstrated very different values for bond strength.

Journal Article.  0 words. 

Subjects: Restorative Dentistry and Orthodontics

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