Original scientific paper
https://doi.org/10.15644/asc53/1/2
Comparison of Shear Bond Strength Orthodontic Brackets Bonded to Zirconia and Lithium Disilicate Crowns
Blerim Mehmeti
; Zavod za ortodonciju i pedodonciju Medicinskog fakulteta Sveučilišta u Prištini, Kosovo
Jeta Kelmendi
; School of Dental Medicine - Ph.D. studies, University of Zagreb, Croatia
Donika Ilijazi-Shahiqi
; School of Dental Medicine - Ph.D. studies, University of Zagreb, Croatia
Bleron Azizi
; School of Dental Medicine, University College AAB, Pristina, Kosovo
Suzana Jakovljević
; Department for Materials, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Croatia
Fehim Haliti
; Department of Orthodontics and Pedodontics, Medical Faculty - School of Dentistry, University of Pristina, Kosovo
Sandra Anić-Milošević
orcid.org/0000-0003-2641-2364
; Department of Orthodontics, School of Dental Medicine, University of Zagreb, Zagreb, Croatia
Abstract
Aim of this study was to analyze Shear Bond Strength (SBS) and Adhesive Remnant Index (ARI) of ceramic and metallic orthodontic brackets bonded to zirconia or lithium-disilicate ceramics used for
prosthetic restorations, conditioned with hydrofluoric acid (HFA) or phosphoric acid (PhA), as well as to determine the Porcelain Fracture Index (PFI), in order to examine the condition of the ceramic surface after debonding. Material and methods: The research was conducted on 96 prepared all-ceramic samples divided into 8 groups combined from the type of ceramic material, orthodontic brackets, and surface conditioning. SBS was tested with Universal Testing Machine, and the samples were analyzed using a Scanning Electron Microscope, to determine ARI and PFI. Statistical data were processed using ANOVA, with the level of significance α = 0.05. Results: Lithium-disilicate showed better bond strength in almost all groups. However, no significant difference between the groups was noticed and none of the factors had a significant influence on the mean values of SBS (p>0.05). Nevertheless, ARI significantly depended on the type of bracket (p = 0.005), and PFI significantly depended on the type of etchant (p = 0.029). Conclusion: The use of HFA for surface etching of zirconia and lithium-disilicate, does not cause a significant increase in the SBS values as compared to etching with PhA and silane application. Furthermore, HFA can weaken the surface structure of the ceramic, and considering its toxicity, might not be the best suitable conditioner prior to orthodontic bonding to lithium disilicate, and in particular to zirconia, also taking into account its crystalline structure.
Keywords
Orthodontic Brackets; Shear Bond Strength; Crowns; Adhesive Remnant Index (ARI); Porcelain Fracture Index (PFI); Zirconia; Lithium Compounds
Hrčak ID:
217997
URI
Publication date:
19.3.2019.
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