Hypersensitivity reactions to dental materials in a referred group of patients

Stenman, Evert; Bergman, Maud

doi:10.1111/j.1600-0722.1989.tb01433.x

Cited by 30 publications

(26 citation statements)

References 22 publications

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“…In the humid environment of the oral cavity all alloys undergo corrosion, at least to a certain extent. 9 A number of factors can affect the process of ion release by an alloy: Manufacturing method; bracket surface characteristics; features of the environment in which brackets are inserted, such as composition, temperature, pH, bacterial flora, enzyme activity and the presence of proteins; 10 in addition to factors such as alloy usage (aging), which may be subject to adverse conditions such as stress, heat treatment, recycling or reuse of components, among others. 2) What can be done to reduce the biodegradation of metal brackets?…”

Section: Editor's Summarymentioning

confidence: 99%

Biodegradação de braquetes ortodônticos: análise por microscopia eletrônica de varredura

Menezes

Souza²,

Dolci³

et al. 2010

Dental Press J. Orthod.

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Objectives: The purpose of this study was to analyze, with the aid of scanning electron microscopy (SEM), the chemical and structural changes in metal brackets subjected to an in vitro biodegradation process. Methods: The sample was divided into three groups according to brackets commercial brand names, i.e., Group A = Dyna-Lock, 3M/Unitek (AISI 303) and Group B = LG standard edgewise, American Orthodontics (AISI 316L). The specimens were simulated orthodontic appliances, which remained immersed in saline solution (0.05%) for a period of 60 days at 37°C under agitation. The changes resulting from exposure of the brackets to the saline solution were investigated by microscopic observation (SEM) and chemical composition analysis (EDX), performed before and after the immersion period (T0 and T5, respectively). Results: The results showed, at T5, the formation of products of corrosion on the surface of the brackets, especially in Group A. In addition, there were changes in the composition of the bracket alloy in both groups, whereas in group A there was a reduction in iron and chromium ions, and in Group B a reduction in chromium ions. Conclusions: The brackets in Group A were less resistant to in vitro biodegradation, which might be associated with the type of steel used by the manufacturer (AISI 303). Editor's summaryThe occurrence of hypersensitivity caused by the nickel present in stainless steel alloyswidely used in orthodontic treatment-has become increasingly common. Orthodontic brackets, bands and archwires are universally made from this alloy, which contains about 6% to 12% nickel and 15% to 22% chromium. Besides allergenicity, carcinogenic, mutagenic and cytotoxic effects have been attributed to nickel and, to a lesser extent, chromium. One of the factors that determine the biocompatibility of alloys used in dentistry is their resistance to corrosion. However, despite the high resistance of austenitic stainless steel-the major alloy employed in the manufacture of orthodontic brackets-several studies have revealed the corrosion of these brackets. In view of the wide array of factors associated with * Access www.dentalpress.com.br/journal to read the full article.

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Section: Editor's Summarymentioning

confidence: 99%

Biodegradação de braquetes ortodônticos: análise por microscopia eletrônica de varredura

Menezes

Souza²,

Dolci³

et al. 2010

Dental Press J. Orthod.

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“…Allergies to chromium salts are found in less than 1% of both genders. Allergies to palladium [8,9] and to gold, cobalt and copper [9] usually accompany nickel salt allergies. Previously, allergic reactions in the oral cavity to chromium alloys or in patients with metal restorations were thought to be exceptionally rare [10], but in recent years the number of patients with diagnosed dermal allergies to the most commonly used metal alloy components has grown rapidly [3,4,[11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Cytological response of palatal epithelium to TiN-coated CoCr alloy denture

Łukomska−Szymańska

Brzeziński

Zieliński

et al. 2012

Folia Histochem Cytobiol.

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Abstract:The aim of this study was to assess the impact of titanium nitride coatings on CoCr alloy metal parts in framework dentures on human palatal epithelium cytology compared to framework dentures made with the same alloy but without titanium nitride coating, and to acrylic dentures. Every prosthetic restoration introduced into the oral cavity and remaining in direct contact with the palate exhibits a varied and harmful effect on the state of the palatal epithelium by disturbing its keratinization. CoCr alloy dentures produce a significantly greater perturbation of keratinization compared to acrylic dentures. There is no evidence showing that a titanium nitride coating of the CoCr alloy plays a protective role in the environment of the oral cavity.

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“…In the humid environment of an oral cavity, all alloys are susceptible to corrosion, if only to some extent. 6 Menezes et al 7 analyzed structural and chemical alterations in several metallic brackets, and observed that the wrinkled surface of new brackets makes them more susceptible to the corrosive process, and consequently the release of metallic ions.…”

Section: Introductionmentioning

confidence: 99%

Comparison surface characteristics and chemical composition of conventional metallic and Nickel-Free brackets

et al. 2015

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This study aims at comparing conventional and nickelfree metal bracket surface characteristics with elemental composition by scanning electron microscopy (SEM), using energy dispersive spectroscopy (EDS). The sample consisted of 40 lower incisor brackets divided into four groups: ABZ = conventional brackets, Kirium Abzil 3M ® (n = 10); RL = conventional brackets, Roth Light Morelli ® (n = 10); NF = nickel-free brackets, Nickel-Free Morelli ® (n = 10); and RM = nickel-free brackets, Roth Max Morelli ® (n = 10). Qualitative evaluation of the bracket surface was performed using SEM, whereby surface features were described and compared. The elemental composition was analyzed by EDS. According to surface analysis, groups ABZ and RL showed a homogeneous surface, with better finishing, whereas the surfaces in groups NF and RM were rougher. The chemical components with the highest percentage were Fe, Cr and C. Groups NF and MR showed no nickel in their composition. In conclusion, the bracket surface of the ABZ and RL groups was more homogeneous, with grooves and pores, whereas the surfaces in groups NF and RM showed numerous flaws, cracks, pores and grooves. The chemical composition analysis confirmed that the nickel-free brackets had no Ni in their composition, as confirmed by the manufacturer's specifications, and were therefore safe to use in patients with a medical history of allergy to this metal.

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Hypersensitivity reactions to dental materials in a referred group of patients

Cited by 30 publications

References 22 publications

Biodegradação de braquetes ortodônticos: análise por microscopia eletrônica de varredura

Biodegradação de braquetes ortodônticos: análise por microscopia eletrônica de varredura

Cytological response of palatal epithelium to TiN-coated CoCr alloy denture

Comparison surface characteristics and chemical composition of conventional metallic and Nickel-Free brackets

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