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Shear bond strength of rebonded metal brackets using four light-curing resins: an in vitro study
Verónica Estefanía Pozo1, Mauricio Aguirre Balseca1, Marjory Elizabeth Vaca Zapata1
1Department of Health Sciences, University of the Hemispheres, Quito, Ecuador.
Background:
Rebonding of orthodontic brackets requires effective surface conditioning to restore adequate adhesive retention.
Objective:
To compare the shear bond strength (SBS) of rebonded metal brackets using four light-curing resins.
Material And Methods:
Eighty premolars were allocated to two conditioning protocols (n = 40 per group): G1 - enamel etching with 37% phosphoric acid; G2 - sandblasting of bracket bases followed by enamel etching. Each group was subdivided according to the resin used (n = 10 per subgroup): Orthocem (FGM), Bracespace (3M), Transbond XT (3M), and Z250 (3M). Brackets were bonded, debonded, reconditioned, and rebonded. SBS was tested using a universal testing machine (0.5 mm/min). Data were analyzed using Kruskal-Wallis and Dunn's post-hoc tests (α = 0.05).
Results:
In the acid-etched group, there was no statistically significant difference in SBS among the four resins (Kruskal-Wallis, p = 0.097). In the sandblasting group, a significant intergroup difference was observed (p = 0.044). Dunn's post-hoc test identified higher SBS for Bracespace (3M) and Transbond XT (3M) compared with Orthocem (FGM) and Z250 (3M). When comparing conditioning methods within each resin, sandblasting of the bracket bases resulted in significantly higher SBS only for Bracespace and Transbond XT, whereas Orthocem and Z250 showed no significant change.
Conclusions:
Rebonding of metal brackets showed comparable SBS among resins after acid etching. However, when the bracket bases were sandblasted, Bracespace and Transbond exhibited significantly higher bond strengths. Surface preparation of the bracket base is therefore a key factor influencing SBS in rebonding procedures.
