Influence of Surface Treatment and Protracted Ageing on the Shear Bond Strength of Orthodontic Brackets to Two Digitally Fabricated (Milled and 3D-Printed) Polymethacrylate-Based Provisional Crowns.

• Tác giả: Mai Almarzouki, Ahid Amer Alshahrani, Abdullah Hasan Alshehri, Nisreen Nabiel Hassan, Atheer Khawaji, Khurshid Mattoo, Hanan Najmi, Abeer Ali Qahtani, Almaha Sadeli, Mohammed E Sayed
• Ngôn ngữ: eng
• Thông tin xuất bản: Switzerland : Polymers , 2025
• Bộ sưu tập: NCBI
• ID: 705178

Tóm tắt

 This study determined the influence of surface treatment and protracted ageing on the shear bond strength (SBS) of orthodontic brackets bonded to CADCAM (milled) and 3D-printed polymethylmethacrylate (PMMA) provisional crowns (PCs). Eighty disc-shaped specimens [forty milled (CopraTemp WhitePeaks) [group (Gp) M] and forty printed (Asiga DentaTooth) (Gp P)] were divided into eight subgroups (Gp) based on surface treatment [no treatment (control) (Gp MC and Gp PC), coarse diamond (Gp MCD and Gp PCD), fine diamond (Gp MFD, and GP PFD) and sandblast (Gp MSB and Gp PSB)]. Orthodontic brackets were bonded (Assure Plus, Transbond XT), thermocycled (2200 cycles), and tested for SBS and failure (Adhesive Remnant Index) (ARI). Statistical tests included analysis of variance (ANOVA)
  Kruskal-Wallis (ARI ranks)
  and post hoc (Tukey, Dunn, and Bonferroni) for determining group differences at predetermined probability