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-41-everStickC&B3815 Mechanical Properties of Fiber-reinforced Provisional C&B Materials and ThermocyclingEffectsPoster Presentation3:45 PM–5:00 PM Mar 25, 2017CC, First Floor Authors:Authors:GenovebaSmirlian, Henry M. Goldman School of Dental Medicine,BostonUniversityNasreenAlbar(Presenter)Henry M. Goldman School of Dental Medicine,BostonUniversityYuweiFan, Henry M. Goldman School of Dental Medicine,BostonUniversityDan Nathanson, Henry M. Goldman School of Dental Medicine,BostonUniversityAbstract: Objectives: To assess the reinforcement effect of incorporating glass-fibers on flexural strength and flexural modulus of crown and bridge provisional restorative materials with thermocyclingtreatment.treatment.Methods: Two commercially available light-curing unidirectional glass-fibers, were tested: Dentapreg(ADM), and everStick®C&B(GC) in combination with 2 self-curing provisional C&B materials: PMMA (Coldpac, Yates Motloid) and Bis-acrylic(ProtempPlus, 3M). Rectangular specimens measuring 3×3×24mm were fabricated using customized aluminum molds in the following six groups (n=20/group): A. Coldpac; B. Coldpacwith Dentapreg; C. Coldpackwith everStick®C&B; D. Protemp; E. Protempwith Dentapreg; F. Protempwith everStick®C&B. For each reinforced specimen, the provisional material was applied into the bottom 1/3 of the mold. A coating of bonding agent and 24mm fiber were placed and cured for 5 seconds by Bluphase16i (Ivoclar). Another coating of adhesive was applied on the fiber and the remaining 2/3 of the mold was filled with the provisional material, then cured for 40 seconds. Each group was further mold was filled with the provisional material, then cured for 40 seconds. Each group was further divided in two subgroups (n=10/group) for water storage (37oC, 72hrs) and thermocycling(5-55oC, 3000 cycles, TC). All specimens were then subjected to a three-point bending test (Instron5566A). Flexural strength and flexural modulus data were analyzed via one-way ANOVA using SAS JMP12.Results: Flexural strength and flexural modulus of tested materials are shown in the bar charts below.Conclusions: The fiber-reinforced groups demonstrated significantly higher flexural strength and flexural modulus than non-reinforced groups (p< 0.001). Water storage and thermocyclinghad no significant effect on the flexural strengths in all groups. No significant difference was found no significant effect on the flexural strengths in all groups. No significant difference was found between the reinforcement effects of Dentapregand everStick®C&B(p =0.275). Thermocyclinghad a significant effect of lowering the flexural modulus of Protemp-Plus with Dentapreg(p=0.0046).Image(s):Disclosure Statement:The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The Reprinted with permission from the Journal of Dental Research, J Dent Res 96 (Spec Iss A):-41-relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: N/AI have read the IADR policy on licensing.Signed by NissAlbarabstract number 3815, https://iadr2017.zerista.com/event/member/336250, 2017