INTRODUCTION: The objective of this study was to test the hypothesis that toxic metallic ions in silver solder used in orthodontics are released into saliva. METHODS: The sample included 60 children, 8 to 14 years of age, divided into 2 groups (n = 30 in each group): the control group and the study group (needing maxillary expansion with the hyrax appliance). For analysis of the release of metallic ions, saliva samples from each patient were collected at 6 times in both groups: before placement of the appliance and 10 minutes, 24 hours, and 7, 30, and 60 days after placement. The analysis of saliva was performed by atomic absorption spectrophotometry in a graphite oven to determine the concentrations of cadmium, copper, zinc, and silver ions. Statistical analyses were performed by the mixed model for repeated-measures covariance structure of the symmetrical component type, at P <0.05. RESULTS: The ion concentrations in the control group had low values for cadmium, copper, and zinc (P >0.05); for silver ions, the values did not reach the detection limit. In the study group, all ions showed expressive concentrations at 10 minutes after placement of the appliance (P <0.001), with the highest mean for copper (70.60 μg/L) and the lowest mean for zinc (0.07 μg/L). Comparison between groups revealed significant differences for copper (all periods), zinc (10 minutes, 24 hours, 7 and 30 days), and for cadmium only at 10 minutes. CONCLUSIONS: Great amounts of these ions were released, with the highest concentrations immediately after placement of the appliance.
INTRODUCTION: The objective of this study was to test the hypothesis that toxic metallic ions in silver solder used in orthodontics are released into saliva. METHODS: The sample included 60 children, 8 to 14 years of age, divided into 2 groups (n = 30 in each group): the control group and the study group (needing maxillary expansion with the hyrax appliance). For analysis of the release of metallic ions, saliva samples from each patient were collected at 6 times in both groups: before placement of the appliance and 10 minutes, 24 hours, and 7, 30, and 60 days after placement. The analysis of saliva was performed by atomic absorption spectrophotometry in a graphite oven to determine the concentrations of cadmium, copper, zinc, and silver ions. Statistical analyses were performed by the mixed model for repeated-measures covariance structure of the symmetrical component type, at P <0.05. RESULTS: The ion concentrations in the control group had low values for cadmium, copper, and zinc (P >0.05); for silver ions, the values did not reach the detection limit. In the study group, all ions showed expressive concentrations at 10 minutes after placement of the appliance (P <0.001), with the highest mean for copper (70.60 μg/L) and the lowest mean for zinc (0.07 μg/L). Comparison between groups revealed significant differences for copper (all periods), zinc (10 minutes, 24 hours, 7 and 30 days), and for cadmium only at 10 minutes. CONCLUSIONS: Great amounts of these ions were released, with the highest concentrations immediately after placement of the appliance.
Authors: Bernhard Michalke; Bernd Rossbach; Thomas Göen; Anja Schäferhenrich; Gerhard Scherer Journal: Int Arch Occup Environ Health Date: 2014-03-12 Impact factor: 3.015
Authors: Ramiro Estacia da Silveira; Tatiana Siqueira Gonçalves; Helena Reis de Souza Schacher; Luciane Macedo de Menezes Journal: J Orthod Sci Date: 2022-05-04
Authors: Rafael Velasco-Ibáñez; Edith Lara-Carrillo; Raúl Alberto Morales-Luckie; Elizabeth Teresita Romero-Guzmán; Víctor Hugo Toral-Rizo; Marius Ramírez-Cardona; Verónica García-Hernández; Carlo Eduardo Medina-Solís Journal: Sci Rep Date: 2020-12-17 Impact factor: 4.379