Nickel-free vs conventional braces for patients allergic to nickel: gingival and blood parameters during and after treatment

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dc.creatorCamila Alessandra Pazzini
dc.creatorLuciano José Pereira
dc.creatorLeandro Silva Marques
dc.creatorJoana Ramos-Jorge
dc.creatorTarcília Aparecida da Silva
dc.creatorSaul Martins de Paiva
dc.date.accessioned2025-03-31T19:42:45Z
dc.date.accessioned2025-09-09T00:46:05Z
dc.date.available2025-03-31T19:42:45Z
dc.date.issued2016-12
dc.identifier.doihttps://doi.org/10.1016/j.ajodo.2016.05.009
dc.identifier.issn1097-6752
dc.identifier.urihttps://hdl.handle.net/1843/81141
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofAmerican Journal of Orthodontics and Dentofacial Orthopedics
dc.rightsAcesso Restrito
dc.subjectBasophils
dc.subjectEvaluation study
dc.subjectGingiva
dc.subjectBlood
dc.subjectNickel
dc.subjectNeutrophils
dc.subjectPeriodontal index
dc.subjectAntibodies
dc.titleNickel-free vs conventional braces for patients allergic to nickel: gingival and blood parameters during and after treatment
dc.typeArtigo de periódico
local.citation.epage1019
local.citation.issue6
local.citation.spage1014
local.citation.volume150
local.description.resumoIntroduction: Allergic and inflammatory reactions have commonly been associated with the release of metal ions during orthodontic treatment. Our objective was to evaluate prospectively gingival and blood status in patients allergic to nickel. Methods: Allergy to nickel was diagnosed using a patch test. Two groups were established: conventional braces (n = 21) and nickel-free braces (n = 21). The gingival index was used to determine gingival status before treatment, periodically for 12 months (evaluations every 3 months), and 1 month after the removal of the braces. Blood status was evaluated with a complete blood count, including the quantification of nickel and immunoglobin E before treatment, during treatment, and 1 month after removal of the braces. The data were analyzed using Mann-Whitney, Student t, Wilcoxon, repeated measures analysis of variance, Friedman, and chi-square tests. Either the Pearson or the Spearman correlation coefficients were calculated, when appropriate. Results: The number of basophils increased significantly among the evaluations in both groups (conventional, P = 0.002; nickel-free, P = 0.001), whereas the number of eosinophils and the immunoglobin E levels decreased significantly in the conventional group (P = 0.004). Plasma nickel levels were increased before and during treatment, and decreased 1 month after removing the braces in both groups, but the differences were significant only in the nickel-free group (P = 0.002). No correlations were found between the concentrations of nickel and immunoglobin E, basophils, or eosinophils, or between the gingival index and either bands or segmented neutrophils (P ≥ 0.05). Conclusions: Patients treated with nickel-free braces had better gingival health and smaller blood changes than did those treated with conventional braces. All abnormalities tended to be eliminated after the removal of the braces.
local.identifier.orcidhttps://orcid.org/0000-0002-1699-4682
local.identifier.orcidhttps://orcid.org/0000-0002-0502-2554
local.identifier.orcidhttps://orcid.org/0000-0003-1906-3784
local.identifier.orcidhttps://orcid.org/0000-0001-9623-7835
local.identifier.orcidhttps://orcid.org/0000-0002-3968-1638
local.publisher.countryBrasil
local.publisher.departmentFAO - DEPARTAMENTO DE CLÍNICA
local.publisher.departmentFAO - DEPARTAMENTO DE ODONTOPEDIATRIA E ORTODONTIA
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S0889540616304656?via%3Dihub

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