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Comparison of shear bond strength of orthodontic brackets using various zirconia primers

Title
 Comparison of shear bond strength of orthodontic brackets using various zirconia primers 
Authors
 Ji Yeon Lee ; Jin Seok Kim ; Chung Ju Hwang 
Issue Date
2015
Journal Title
 Korean Journal of Orthodontics (대한치과교정학회지) 
ISSN
 2234-7518 
Citation
 Korean Journal of Orthodontics (대한치과교정학회지), Vol.45(4) : 164~170, 2015 
Abstract
OBJECTIVE: The aim of this study was to compare the shear bond strength (SBS) of orthodontic brackets bonded to zirconia surfaces using three different zirconia primers and one silane primer, and subjected to thermocycling. METHODS: We designed 10 experimental groups following the surface treatment and thermocycling. The surface was treated with one of the following method: no-primer (NP), Porcelain Conditioner (PC), Z-PRIME Plus (ZP), Monobond Plus (MP) and Zirconia Liner Premium (ZL) (n=20). Then each group was subdivided to non-thermocycled and thermocycled groups (NPT, PC, ZPT, MPT, ZLT) (n=10). Orthodontic brackets were bonded to the specimens using Transbond™ XT Paste and light cured for 15 s at 1,100 mW/cm(2). The SBS was measured at a 1 mm/min crosshead speed. The failure mode was assessed by examination with a stereomicroscope and the amount of bonding resin remaining on the zirconia surface was scored using the modified adhesive remnant index (ARI). RESULTS: The SBS of all experimental groups decreased after thermocycling. Before thermocycling, the SBS was ZL, ZP ≥ MP ≥ PC > NP but after thermocycling, the SBS was ZLT ≥ MPT ≥ ZPT > PCT = NPT (p > 0.05). For the ARI score, both of the groups lacking primer (NP and NPT) displayed adhesive failure modes, but the groups with zirconia primers (ZP, ZPT, MP, MPT, ZL, and ZLT) were associated with mixed failure modes. CONCLUSIONS: Surface treatment with a zirconia primer increases the SBS relative to no-primer or silane primer application between orthodontic brackets and zirconia prostheses.
URI
http://ir.ymlib.yonsei.ac.kr/handle/22282913/140767
DOI
10.4041/kjod.2015.45.4.164
Appears in Collections:
1. 연구논문 > 2. College of Dentistry > Dept. of Orthodontics
Yonsei Authors
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