فهرست نشریات علمی دسترسی آزاد ایران

AimThis in vitro study evaluated the transfer accuracy and surface wear of clear aligner attachments fabricated using composite resins with different viscosities and two attachment designs.MethodsThirty‑six extracted human teeth were assigned to six groups based on composite resin type (restorative, orthodontic, or flowable) and attachment design (conventional rectangular or optimized cylindrical). Attachments were digitally planned, transferred using 3D‑printed templates, and scanned at baseline (T0) and after mounting (T1) to assess transfer accuracy. Samples then underwent simulated toothbrushing for 30,000 cycles at 2 N force before being rescanned (T2–T3). Three‑dimensional deviations between scans were quantified using Geomagic Control X. Two-way ANOVA and Tukey HSD tests were used for statistical analysis (α=0.05).ResultsComposite viscosity and attachment design showed no significant influence on transfer accuracy (P>0.05). Surface wear differed significantly among groups (P<0.001). Restorative composite resin demonstrated the least wear (mean 0.12 mm), followed by orthodontic composite resin, while flowable composite resin exhibited the greatest wear (mean 0.31 mm). Cylindrical attachments generally showed lower wear than rectangular attachments.ConclusionUnder the conditions of this study, composite resin viscosity did not affect attachment transfer accuracy. Surface wear following simulated toothbrushing was lower in high‑filler restorative composites and in optimized cylindrical attachment designs.