Original Article
Retentive Strength of Orthodontic Bands Cemented with Amorphous Calcium Phosphate-Modified Glass Ionomer Cement: An In-Vitro Study Farzin Heravi 1, Maryam Omidkhoda 2, Niloufar Koohestanian 3, Tabassom Hooshmand 4, Hossein Bagheri 5, Negin Ghaffari 6 1
Professor, Department of Orthodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran Associate Professor, Oral & Maxillofacial Diseases Research Center, Mashhad University of Medical Sciences, Mashhad, Iran 3 Advanced Implantology Student, UCLA School of Dentistry, Los Angles, USA 4 Associate Professor, Department of Dental Biomaterials, School of Dentistry, Research Center for Science and Technology in Medicine, Tehran University of Medical Sciences, Tehran, Iran 5 Assistant Professor, Dental Materials Research Center, Mashhad University of Medical Sciences, Mashhad, Iran 6 Dental Student, University of Toronto, Faculty of Dentistry, Toronto, Canada 2
Abstract Objectives: The aim of this study was to evaluate and compare the retentive strength of orthodontic bands cemented with amorphous calcium phosphate (ACP)-containing and conventional glass ionomer cements (GICs). Materials and Methods: One-hundred-and-twenty mandibular third molars were embedded in acrylic resin blocks with the buccal surface of crowns perpendicular to the base of the mold. The teeth were randomly divided into four groups containing 30 teeth each. Groups 1 and 3 were cemented using conventional GIC and groups 2 and 4 were cemented using ACPcontaining orthodontic cement. Groups 1 and 2 without thermocycling, and groups 3 and 4 after thermocycling (5000 cycles, 5° to 55°C) were tested for retentive strength using a universal testing machine (crosshead speed of 1mm/minute). Two-way ANOVA was performed to compare the retentive strength of the groups. Results: The highest retentive strength belonged to group 1, and it was significantly higher Corresponding author: N. Koohestanian, Advanced than that of group 2 (P
Retentive Strength of Orthodontic Bands Cemented with Amorphous Calcium Phosphate-Modified Glass Ionomer Cement: An In-Vitro Study Farzin Heravi 1, Maryam Omidkhoda 2, Niloufar Koohestanian 3, Tabassom Hooshmand 4, Hossein Bagheri 5, Negin Ghaffari 6 1
Professor, Department of Orthodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran Associate Professor, Oral & Maxillofacial Diseases Research Center, Mashhad University of Medical Sciences, Mashhad, Iran 3 Advanced Implantology Student, UCLA School of Dentistry, Los Angles, USA 4 Associate Professor, Department of Dental Biomaterials, School of Dentistry, Research Center for Science and Technology in Medicine, Tehran University of Medical Sciences, Tehran, Iran 5 Assistant Professor, Dental Materials Research Center, Mashhad University of Medical Sciences, Mashhad, Iran 6 Dental Student, University of Toronto, Faculty of Dentistry, Toronto, Canada 2
Abstract Objectives: The aim of this study was to evaluate and compare the retentive strength of orthodontic bands cemented with amorphous calcium phosphate (ACP)-containing and conventional glass ionomer cements (GICs). Materials and Methods: One-hundred-and-twenty mandibular third molars were embedded in acrylic resin blocks with the buccal surface of crowns perpendicular to the base of the mold. The teeth were randomly divided into four groups containing 30 teeth each. Groups 1 and 3 were cemented using conventional GIC and groups 2 and 4 were cemented using ACPcontaining orthodontic cement. Groups 1 and 2 without thermocycling, and groups 3 and 4 after thermocycling (5000 cycles, 5° to 55°C) were tested for retentive strength using a universal testing machine (crosshead speed of 1mm/minute). Two-way ANOVA was performed to compare the retentive strength of the groups. Results: The highest retentive strength belonged to group 1, and it was significantly higher Corresponding author: N. Koohestanian, Advanced than that of group 2 (P
