In vitro shear bond strength study of new and reconditioned stainless steel orthodontic brackets

Document Type : Original Article

Authors

1 Orthodontics department, Faculty of Dentistry, Alexandria University, Egypt

2 Dental Biomaterials Department, Faculty of Dentistry, Alexandria University, Egypt

Abstract

This study was conducted to compare the shear bond strength between new and reconditioned brackets using four reconditioning techniques on two bracket base designs. Eighty specimens were divided into two equal groups according to bracket base designs, mesh-base brackets group (Ormco), and laser-base brackets group (Dentaurum). In each group, new brackets were bonded to premolar teeth and the bond strength was recorded as a base line (control 1). Each group was further subdivided into five equal subgroups as follows: first subgroup, debonded brackets were removed, new brackets were bonded and the bond strength was recorded as (control 2), for the remaining four subgroups, debonded brackets were rebonded after reconditioning by 30 1m silanated sandblasting, 50 1m non silanated sandblasting, acid bath, and carbide bur and their bond strengths measured. Statistical analysis revealed that there was significant difference in the bond strength between the two bracket base designs used (P = 0.000) as laser-structured base brackets demonstrated higher bond strength (mean= 18.7±5.2 MPa) compared to mesh-base brackets (mean= 14.6±4.2 MPa). Moreover, there was significant difference (P = 0.000) in bond strength between the different reconditioning techniques. On the contrary, there was no significant difference (P = 0.840) on the interaction between the type of bracket base design and reconditioning technique as both designs of bracket base responded similarly to each reconditioning technique. In conclusion, bracket reconditioning using sandblasting technique was efficient and technically simple, and might provide cost reduction for orthodontists and patients alike.

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