Effect of impregnated fibers on the flexural strength of crown and bridge provisional restorative materials
Smirlian Hagopian, Genoveba Cibel
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Objectives: To assess the reinforcement effect of incorporating resin-impregnated glass-fibers on flexural strength and flexural modulus of crown and bridge provisional restorative materials. Materials and Methods: Two commercially available light-curing resin-impregnated unidirectional glass-fibers were tested: Dentapreg (ADM), and everStick[R]C&B (GC) in combination with 2 self-curing provisional C&B materials: PMMA (Coldpac, Yates Motloid) and Bis-acrylic (Protemp Plus, 3M). Rectangular specimens measuring 3mmx3mmx24mm were fabricated using customized aluminum molds in the following groups (n=20/group): A. CoIdpac; B. Coldpac with Dentapreg; C. Coldpac with everStick[R]C&B, D. Protemp; E. Protemp with Dentapreg; F. Protemp with everStick[R]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 divided in two subgroups (n=10/group) for water storage (37[degrees]C, 72hrs) and thermocycling (5-55[degrees]C, 3000 cycles). All specimens were then subjected to a three point bending test (lnstron 5566A). FlexuraI strength and flexural modulus data were analyzed via one-way ANOVA using SAS JMP11 Pro. Results: Analysis of variance revealed a statistically significant difference (P[less than]0.001) on provisional materials with and without glass fiber reinforcement. All fiber reinforced groups showed a significant higher fIexural strength and fIexural modulus than all pure matrix material groups. However, water soaking and thermal cycling have shown no significant difference in flexural strength and flexural modulus. Conclusion: Within the limitations of the study, it can be concluded that both Dentapreg and everStick[R]C&B glass fiber reinforcement significantly increase flexuraI strength and flexural modulus of Coldpac and Protemp Plus provisional materials.
PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact email@example.com.Thesis (MSD) --Boston University, Henry M. Goldman School of Dental Medicine, 2015 (Department of Restorative Sciences and Biomaterials).Includes bibliographic references: leaves 79-86.
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