Objective: To determine the prevalence of nickel allergy in a sample of orthodontic patients and longitudinally compare the clinical periodontal status of these individuals with that of a group of nonallergic patients. Materials and Methods:The initial sample consisted of 96 patients selected randomly from a databank of patients who sought orthodontic care at a teaching institution. Following the selection and beginning of treatment, periodontal status was assessed over a 12-month period (one evaluation every 3 months-T 1 , T 2, T 3, T 4 ) using the Loe index. The evaluations were performed blindly by a single, calibrated examiner and were followed by prophylaxis and orientation regarding oral hygiene. The prevalence of nickel allergy was determined by the patch test 9 months after the beginning of treatment and occurred in 16 individuals (17.2%). Two groups were then established: the allergic group (AG, n ϭ 16) and the age-paired nonallergic control group (NAG, n ϭ 16). Data were analyzed using the Mann-Whitney U-test and Friedman's analysis of variance (ANOVA) tests (P Յ .05). Results: Significant differences were present between groups at the T 3 and T 4 evaluations for the LOE index (P ϭ .045 and .009), with allergic individuals showing higher mean values than nonallergic individuals (hyperplasia, change in color, and bleeding). No significant differences were found in the intragroup evaluations between the four evaluations (P Ͼ .05). Conclusions:The results suggest a cumulative effect from nickel throughout orthodontic treatment associated with clinically significant periodontal abnormalities in allergic individuals over time. (Angle Orthod. 2009;79:922-927.)
Objective: To perform a longitudinal comparison of periodontal status in allergic individuals treated with conventional and nickel-free braces. Materials and Methods: Forty-two individuals allergic to nickel were randomly divided into two groups: those receiving conventional braces (n 5 21) and those receiving nickel-free braces (n 5 21). Periodontal status (gingival hyperplasia, change in color and bleeding) was assessed before treatment (T0) and at 3-month intervals for 12 months (T1, T2, T3, and T4), using the Lö e Index. Evaluations were performed blindly by a single, calibrated examiner, followed by prophylaxis and orientations regarding oral hygiene. Data were analyzed using the Mann-Whitney U-test for comparisons of the gingival index between groups and Friedman's test for successive comparisons between sessions in the same group (P # .05). Results: Periodontal status did not differ between groups in the initial 9 months of treatment, whereas significant differences were found at T3 and T4 (.039 and .047, respectively). Individuals wearing conventional appliances had higher mean gingival index scores than those wearing nickelfree braces. Conclusion: Individuals with an allergy to nickel exhibit better periodontal health when treated with nickel-free braces than with conventional braces. (Angle Orthod. 2012;82:653-657.)
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