title: Shear bond strength of metal-ceramic repair systems.
abstract: This study evaluated the shear bond strength of different repair systems to nickel-chromium (NiCr) alloy after storage in water for either 24 hours or six months. One hundred cylindrical specimens (3 mm thick x 9 mm diameter) were fabricated using an NiCr alloy and embedded in a PVC ring, where they received one of five bonding and resin composite repair treatments (n = 20): Clearfil SE Bond/Clearfil AP-X (Group 1), Bistite II DC/Palfique (Group 2), CoJet/Z100 (Group 3), Scotchbond Multi-Purpose Plus/Z100 (Group 4; reference group), and CoJet Sand plus Scotchbond Multi-Purpose Plus/Z100 (Group 5). The specimens were stored in distilled water for 24 hours at 37 degrees C, thermocycled for 1,000 cycles in two baths (at 5 degrees C and 55 degrees C) with a dwell time of 30 seconds for each bath, and stored in distilled water at 37 degrees C for either 24 hours or six months. At 24 hours, Group 3 presented the highest mean values (P < 0.001); at six months, Group 5 demonstrated the highest mean values (P < 0.001). At six months, Group 5 presented a significant increase in shear bond strength (P < 0.001), while Groups 1 and 3 showed a significant reduction (P < 0.001). There were no significant differences between the storage times for Group 2 (P = 0.064) or Group 4 (P = 0.490).
authors.affiliation: Department of Dental Materials and Prosthodontics, Araraquara Dental School, Sao Paulo State University (UNESP), Araraquara, SP, Brazil.
authors.forename: Isabella Gagliardi
authors.initials: IG
authors.lastname: Haneda
authors.forename: Renata Garcia
authors.initials: RG
authors.lastname: Fonseca
authors.forename: Juliana Gomes dos Santos Paes
authors.initials: JG
authors.lastname: de Almeida
authors.forename: Carlos Alberto dos Santos
authors.initials: CA
authors.lastname: Cruz
authors.forename: Gelson Luis
authors.initials: GL
authors.lastname: Adabo
mesh_terms: D002858:Chromium Alloys; D001840:Dental Bonding; D017269:Dental Prosthesis Repair; D003799:Dental Stress Analysis; D006868:Hydrolysis; D008422:Materials Testing; D016876:Metal Ceramic Alloys; D019279:Resin Cements; D033081:Shear Strength
chemical_list: D002858:Chromium Alloys; D016876:Metal Ceramic Alloys; D019279:Resin Cements