275 SHEAR CREEP BEHAVIOR OF AN ADHESIVE RESIN SYSTEM AT THE INTERFACE BETWEEN AN ORTHODONTIC BRACKET AND ENAMEL B. H. Durgesh, 1* A. A. Alkheraif, 2 M. K. Altwijry, 3 M. A. Asiry, 4 I. AlShahrani, 5 J. Varrela, 6 and P. K. Vallittu 7 Keywords: adhesive system, creep, bonding, fber-reinforced composites Creeping of a resin-composite-based interface between the enamel and an orthodontic bracket was investigated using two testing setups — tooth-bracket and three-point bending ones. Orthodontic brackets were bonded onto an etched enamel surface using various resin composites. A static load was applied to the bracket-tooth, and the time required to debond it from the tooth surface was recorded. In the three-point bending test, the creep and recovery of the resin composite materials were tested using rectangular test specimens. It was found that the incorporation of continuous glass fbers at the interface between the orthodontic bracket and enamel increased the creeping and debonding time of the brackets Mechanics of Composite Materials, Vol. 55, No. 2, May, 2019 (Russian Original Vol. 55, No. 2, March-April, 2019) 1 Dental Health Department, College of Applied Medical Sciences, King Saud University and Department of Biomaterials Science, University of Turku, Turku, Finland 2 Dental Health Department, Dental Biomaterials Research Chair, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia 3 General Dentist, King Abdulaziz Medical City, Riyadh, Saudi Arabia 4 Department of Pediatric Dentistry and Orthodontics, College of Dentistry, King Saud University, Riyadh, Saudi 5 Department of Pediatric Dentistry and Orthodontics, College of Dentistry, King Khalid University, Abha, Saudi Arabia 6 Department of Oral Development and Orthodontics, Institute of Dentistry, University of Turku, Turku and City of Turku Welfare Division, Oral Health Care, Turku, Finland E-mail: jvarrela@utu.f 7 Department of Biomaterials Science and Turku Clinical Biomaterials Centre-TCBC, Institute of Dentistry, University of Turku and City of Turku Welfare Division, Oral Health Care, Turku, Finland and King Saud University, Visiting Professor Program *Corresponding author; tel.: +966 537135611; e-mail: drdurgesh19@gmail.com 0191-5665/19/5502-0275 © 2019 Springer Science+Business Media, LLC Russian translation published in Mekhanika Kompozitnykh Materialov, Vol. 55, No. 2, pp. 389-402, March-April, 2019. Original article submitted August 03, 2018. DOI 10.1007/s11029-019-09811-2