Restor Dent Endod.  2018 Feb;43(1):e7. 10.5395/rde.2018.43.e7.

Comparison of bond strengths of ceramic brackets bonded to zirconia surfaces using different zirconia primers and a universal adhesive

Affiliations
  • 1Department of Orthodontics, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
  • 2Department of Conservative Dentistry, College of Dentistry, Yonsei University, Seoul, Korea. pjw@yuhs.ac

Abstract


OBJECTIVES
The aim of this study is to compare the shear bond strengths of ceramic brackets bonded to zirconia surfaces using different zirconia primers and universal adhesive.
MATERIALS AND METHODS
Fifty zirconia blocks (15 × 15 × 10 mm, Zpex, Tosoh Corporation) were polished with 1,000 grit sand paper and air-abraded with 50 µm Al2O3 for 10 seconds (40 psi). They were divided into 5 groups: control (CO), Metal/Zirconia primer (MZ, Ivoclar Vivadent), Z-PRIME Plus (ZP, Bisco), Zirconia Liner (ZL, Sun Medical), and Scotchbond Universal adhesive (SU, 3M ESPE). Transbond XT Primer (used for CO, MZ, ZP, and ZL) and Transbond XT Paste was used for bracket bonding (Gemini clear ceramic brackets, 3M Unitek). After 24 hours at 37°C storage, specimens underwent 2,000 thermocycles, and then, shear bond strengths were measured (1 mm/min). An adhesive remnant index (ARI) score was calculated. The data were analyzed using one-way analysis of variance and the Bonferroni test (p = 0.05).
RESULTS
Surface treatment with primers resulted in increased shear bond strength. The SU group showed the highest shear bond strength followed by the ZP, ZL, MZ, and CO groups, in that order. The median ARI scores were as follows: CO = 0, MZ = 0, ZP = 0, ZL = 0, and SU = 3 (p < 0.05).
CONCLUSIONS
Within this experiment, zirconia primer can increase the shear bond strength of bracket bonding. The highest shear bond strength is observed in SU group, even when no primer is used.

Keyword

Ceramic bracket; Multi-mode adhesive; Orthodontic bracket; Universal adhesive; Zirconia; Zirconia primer

MeSH Terms

Adhesives*
Ceramics*
Orthodontic Brackets
Solar System
Adhesives

Figure

  • Figure 1. Scanning electron micrographs (×100) of zirconia surface. (A, B) adhesive failure pattern; (C, D) mixed failure pattern; (E) cohesive failure pattern within the cement. The remnants of the cement were observed on the zirconia surface. CO, control; MZ, Metal/Zirconia primer (Ivoclar Vivadent, Schaan, Liechtenstein); ZP, Z-PRIME Plus (Bisco, Schaumburg, IL, USA); ZL, Zirconia Liner (Sun Medical, Shiga, Japan); SU, Scotchbond Universal adhesive (3M ESPE, St. Paul, MN, USA).


Reference

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