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Shear Bond Strength of Two Chemically Different Denture Base Polymers to Reline Materials
Author(s) -
Ahmad Fauziah,
Dent MClin,
Yunus Norsiah
Publication year - 2009
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2009.00481.x
Subject(s) - materials science , adhesive , composite material , bond strength , universal testing machine , crosshead , post hoc , dentistry , flexural strength , ultimate tensile strength , medicine , layer (electronics)
Purpose: This study evaluated the shear bond strengths of light‐polymerized urethane dimethacrylate (Eclipse) and heat‐polymerized polymethylmethacrylate (Meliodent) denture base polymers to intraoral and laboratory‐processed reline materials. Materials and Methods: Thirty disks measuring 15 mm diameter and 2 mm thick were prepared for each denture base material following the manufacturers’ recommendation. They were relined with Meliodent RR, Kooliner, and Secure reline materials after 1 month of water immersion. Ten additional Eclipse specimens were relined using the same Eclipse resin. A shear bond test was carried out on an Instron machine at a crosshead speed of 1.0 mm/min 24 hours after relining. Data were analyzed using two‐way and one‐way ANOVAs and post hoc Dunnett's T3 test ( p = 0.05). The nature of failure was analyzed under a stereomicroscope. The effect of dichloromethane adhesive on the two denture polymer surfaces and the failed interfaces of mixed and adhesive failures were analyzed under a SEM (scanning electron microscope). Results: Two‐way ANOVA showed significant differences in the shear bond strength values as a function of the denture base polymers, reline materials, and their interaction ( p < 0.05). One‐way ANOVA showed significant differences in shear bond strength values among denture base‐reline combinations ( p < 0.05) except for Meliodent‐Kooliner and Eclipse‐Meliodent RR relines. Meliodent showed the highest shear bond strength value when relined with Meliodent RR (14.5 ± 0.5 MPa), and Eclipse showed the highest value with Eclipse relining (11.4 ± 0.6 MPa). Meliodent denture base showed adhesive, cohesive, and mixed failure, while all Eclipse showed adhesive failure with various reline materials. Conclusion: The two chemically different denture base polymers showed different shear bond strength values to corresponding reline materials.