The effect of hydrochloric acid and sodium hypochlorite on fracture resistance of orthodontic self‑cure acrylic base

Abstract

Background: Patient cooperation is necessary for treatment success in removable orthodontics.
Every factor has an adverse effect on appliances appearance can impede appliance wearing. This
study investigated the effect of immersion in household cleaner and bleach liquids on fracture
resistance of self‑cure orthodontic acrylic resins.
Materials and Methods: Two orthodontic acrylic resins (Megadental® and Acropars®) were used.
Eighty identical acrylic samples (50 mm × 5 mm × 3 mm) from each acrylic resin were fabricated
and divided into four groups (n = 20). For each type of acrylic resin; Group 1: 15 min immersion in
household cleaner liquid (hydrochloric acid [HCl], 10%), 1 min rinsing with running water, 15 min
immersion in household bleach liquid (sodium hypochlorite [NaOCl], 5.25%) and 1 min rinsing with
running water were done. For Group 2, two times and for Group 3, three times immersion just like
Group 1, were done. Group 4, as control, had no immersion. Fracture resistance of samples was
measured with universal testing machine (Instron) in 3‑point bending set‑up. Data were analyzed
with two‑way repeated measurement ANOVA. Significance level was set at 0.05.
Results: Fracture resistance of Acropars groups was greater than counterpart Megadental
ones (P < 0.001). Immersion factor, alone (P = 0.375) and in combination with material (P = 0.603),
did not make a significant difference among fracture resistance of each acrylic resin groups.
Conclusion: 15 min immersion in household cleaner liquid (HCl acid) followed by 15 min immersion
in household bleach liquid (NaOCl 5.25%) and even 3 times repetition of this process had not
significant adverse effect on fracture resistance of acrylic resins.
Key Words: Fracture Resistance, orthodontic removable appliances, self‑cure acrylic base