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Objective: To test the hypothesis that adhesive remnant index (ARI) scores show no differences when examined under different magnifications. Materials and Methods:The study included 80 upper human premolars. Stainless steel brackets were bonded to the specimens with Transbond XT light cure adhesive and Transbond Plus Self Etch Primer (3M Unitek, Monrovia, Calif, USA). The brackets were debonded 24 hours after bonding with a universal testing machine (LLOYD Instruments, Segensworth, Fareham, England) at a cross head speed of 2.00 mm/min. The adhesive remnant was evaluated after debonding with the naked eye and under 10ϫ and 20ϫ magnification (Mag) using the 4-point scale described by Å rtun and Bergland. Results: ARI scores were significantly different at different magnifications (P ϭ .018). Scores were not significantly different when evaluated with the naked eye and under 10ϫ Mag (P ϭ .102). Scores were significantly different under 20ϫ Mag and with the naked eye (P ϭ .014); under 20ϫ Mag, score 0 decreased from 12 to 6 and score 2 increased from 14 to 20 and also under 20ϫ Mag and under 10ϫ Mag (P ϭ .046); the under 20ϫ Mag score 1 decreased from 40 to 38 and score 3 increased from 14 to 16. Conclusion: ARI scores were significantly different under 20ϫ Mag, where score 0 decreased and score 2 increased compared with the naked eye, while score 1 decreased and score 3 increased compared with 10ϫ Mag. (Angle Orthod. 2009;79:773-776.)

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Introduction: Biomimetic hydroxyapatite-based toothpastes have been investigated in recent years for their remineralizing activity on dental surfaces. The aim of the present study was to evaluate the efficacy of toothpaste containing biomimetic hydroxyapatite versus a 1450 pppm fluoride one in promoting the remineralization and desensitization of white spot lesions. Methods: 40 patients were randomly assigned to two different domiciliary oral hygiene treatments: toothpaste containing 1450 ppm of fluoride (control group) and toothpaste containing biomimetic hydroxyapatite (experimental group). Dental sensitivity/pain and dental erosion were assessed at baseline and after 15, 30, and 90 days using the following indexes: Schiff Air Index (SAI), Visual Analogue Scale (VAS), and Basic Erosive Wear Examination (BEWE). Results: Data were submitted for statistical analysis. SAI significantly decreased after 3 months (T3) of treatment only in the Trial group (p < 0.05). VAS values significantly decreased at T2 in the trial group (p < 0.05) with a further significant reduction at T3 (p < 0.05). BEWE scores did not significantly vary during the follow up neither in the trial nor in the control group. Conclusions: The hydroxyapatite-based toothpaste tested caused a reduction of hypersensitivity/pain values higher than conventional fluoride toothpaste.