Bond strength of ceramic veneered CAD-milled alloy upon prolonged sintering

• Published in: Clinical oral investigations 2023-09, Vol.27 (9), p.5377-5389
• Main Authors: Juntavee, Niwut, Juntavee, Apa, Rengpattanakij, Nuttida
• Format: Article
• Language: English
• Subjects: Alloys; Atomic force microscopy; Dentistry; Medicine; Scanning electron microscopy; Sintering; Temperature; Unloading
• ISSN: 1436-3771; 1432-6981; 1436-3771
• DOI: 10.1007/s00784-023-05157-1

Objectives Ceramic-sintering affects bond strength and longevity of metal-ceramic. This study investigated the effect of sintering temperatures and times on metal-ceramic bond strength vis-a-vis interfacial fracture toughness. Materials and methods One hundred eighty rectangular-shaped (25 × 8 × 1 mm) casting (Auriloy® (CA)) and CAD-milling (Ceramill Sintron® (MA)) alloys were prepared and randomly veneered with ceramic at normal (930 °C; (TN)), increased (940 °C; (TI)), and extremely increased (950 °C; (TE)) sintering temperatures and normal (1 min; (HN)), increased (2 min; (HI)), and extremely increased (3 min; (HE)) sintering time ( n  = 10/group). Pre-cracked was subjected to four loading–unloading cycles at 0.05 mm/min speed to determine interfacial fracture toughness from strain energy release rate ( G ). Microstructures were examined with a scanning electron microscope (SEM), energy-dispersive X-ray (EDX), and atomic force microscopy (AFM). ANOVA and Tukey comparisons were determined for significant differences ( α  = 0.05). Results Significant differences in G due to the effect of alloy, sintering temperature, and time ( p