Shear Bond Strength of Composite Veneers and Acrylic Veneer Bonded to Ni–Cr Alloy: A Laboratory Study

Abstract

A growing number of composite materials are being used as an alternative for veneering cast restorations. The objective of this investigation was to evaluate and compare the shear bond strength of UDMA based composite, restorative composite, and heat cure acrylic when veneered to Ni-Cr alloy and to evaluate the type of bond failure. Three different veneering materials were used: heat cure acrylic, UDMA based composite and a restorative composite. 10 samples were fabricated, each with heat cure acrylic and restorative composite and 20 samples were fabricated with UDMA based composite; thus, the total number of samples amounted to 40. All the samples were subject to shear bond stress fracture tests and observed for the type of bond failure. The greatest mean shear bond strength was recorded in relation to the UDMA based composite material when thermal conducting paste was used during the curing (10.51 MPa). The mean bond strength values of UDMA based composite without thermal conducting paste (8.92 MPa), heat cured acrylic veneering material (4.24 MPa) and restorative composite material (5.03 MPa) were significantly different from each other (p > 0.05). Samples veneered with heat cure acrylic veneering material and restorative composite material showed adhesive failure. Samples prepared with UDMA based composite veneering composite showed cohesive or predominantly cohesive failure. UDMA based composite veneering material when used with heat protection paste exceeds the shear bond strength requirement as suggested by Matsumura et al. (>10 MPa). A statistically significant association between the test groups and the type of failure was observed.

Comparison of Adhesive and Mechanical Effects on the Bond Strength of Indirect Composite to Titanium

“…Some studies suggested that primers containing MDP or thiophosphate monomer (MEPS) were effective for chemical bonding between resin and Ti (29)(30)(31). The choice of a chemical bonding system for prosthodontic application may depend on factors such as expense, availability, time requirement, and shelf life of the perishable components (32).…”

Farklı Yaşlandırma İşlemlerinin Bir Seromerin Yüzey Özelliklerine Etkisinin Değerlendirilmesi

“…Kompozitler 1960'lı yıllarda kullanılmaya başlanmış; estetik ihtiyaca cevap veren, düşük maliyetli ve uygulanması kolay dental materyallerdir (1,2). Kompozitlerde yaşanan marjinal uyum problemi, arayüzlerde, komşu diş temas ve kontur alanlarında polimerizasyon büzülmesi göstermesi, aşınma direnci yetersizliği sebebiyle alternatif çözümler üretilerek 1980'li yılların ortalarında büyük ve küçük doldurucu partiküllerin karışımından oluşan "hibrit kompozitler" elde edilmiştir (3)(4)(5).…”