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The European Journal of Orthodontics 1996 18(1):295-301; doi:10.1093/ejo/18.1.295
© 1996 by European Orthodontic Society
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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**

*Departments of Orthodontics, University of Hamburg Germany
**Departments of Operative Dentistry and Periodontology, University of Hamburg Germany

Address for Coreespondence Dr Nilgün Akin-Nergiz, University of Hamburg, Faculty of Dentistry, Department of Orthondontics Martinistraße 52, D-20251 Hamburg, Germany

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.


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