Abstract
Stainless steel crowns (SSCs) are the most durable and effective restorations for the primary teeth. Allergy to nickel as major components is common. The purpose of this study is to evaluate the effect of pH, time, oral temperature, and SSCs trimming on the nickel releasing. This in vitro study was done on 18 same size crowns. Group A (without trim 0 and Group B (with trim) were immersed in 5 ml artificial saliva. The amount of nickel releasing in each 18 subgroup composed from 3 pH (3.5, 5, and 6.75) and 3 temperatures (27°C, 37°C, and 47°C) in 3 times (1, 7, and 21 days), was measured by Atomic Absorption Spectrophotometer. Data were analyzed by SPSS software (SPSS 20, IBM, Armonk, NY, USA) and use of t-test, Duncan, and Tukey's test for analysis of variances. Results were reported with 95% confidence. The amount of nickel releasing reduced with crown trimming, significantly (P = 0.0001). A significant difference was observed in the amount of released nickel in temperature 47°C in comparison with 37°C (P = 0.0001); this measurement was not significant between 47°C and 27°C (P = 0.442). There was no significant difference between concentration of released nickel in 3 pH conditions and also in 3-time situations. The concentration of nickel was lower in trimmed group in comparison to intact group (P = 0.0001). The concentration of released nickel decreased with trimming of margins and increased when temperature increased. Time and pH had no significant effect on released nickel.
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