Semi-interpenetrating network composites reinforced with Kevlar fibers for dental post fabrication

TY - JOUR

T1 - Semi-interpenetrating network composites reinforced with Kevlar fibers for dental post fabrication

AU - Deb, Sanjukta

AU - Almaroof, Ahmed Ghazi Subhy

AU - Mannocci, Francesco

AU - Ali, Ahmed Hamid

PY - 2018

Y1 - 2018

N2 - This study evaluates the reinforcement of semi-interpenetrating network composites of 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropyl)-phenyl] propane (Bis-GMA)/ triethyleneglycol dimethacrylate (TEGDMA)/polymethyl methacrylate (PMMA) and 25% titanium dioxide (TiO2) nanofiller with surface treated Kevlar fibers for potential application as dental posts. The post material was subjectedto thermo-cycling and flexural strength determined, characterised by dynamic mechanical analysis, water sorption, radiopacity and cytotoxicity tests. The results were compared with everStick®POST. Kevlar pre-treatment with acetic acid and silane coupling agent demonstrated a clear effect on the flexural strength of the composites with a significant increase compared to composites with fiberswithout surface treatment. The inclusion of TiO2 into the final formulation provided the desired radiopacity and improved both aesthetics and flexural strength, which exhibits a higher resistance on thermocycling. The ratios of fatigue limit to static flexural strength were about 0.73 for Kevlar and 0.58 for everStick®POSTs; MTT assay confirmed the absence of any toxic eluents, indicating its feasibility as new intracanal post material.

AB - This study evaluates the reinforcement of semi-interpenetrating network composites of 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropyl)-phenyl] propane (Bis-GMA)/ triethyleneglycol dimethacrylate (TEGDMA)/polymethyl methacrylate (PMMA) and 25% titanium dioxide (TiO2) nanofiller with surface treated Kevlar fibers for potential application as dental posts. The post material was subjectedto thermo-cycling and flexural strength determined, characterised by dynamic mechanical analysis, water sorption, radiopacity and cytotoxicity tests. The results were compared with everStick®POST. Kevlar pre-treatment with acetic acid and silane coupling agent demonstrated a clear effect on the flexural strength of the composites with a significant increase compared to composites with fiberswithout surface treatment. The inclusion of TiO2 into the final formulation provided the desired radiopacity and improved both aesthetics and flexural strength, which exhibits a higher resistance on thermocycling. The ratios of fatigue limit to static flexural strength were about 0.73 for Kevlar and 0.58 for everStick®POSTs; MTT assay confirmed the absence of any toxic eluents, indicating its feasibility as new intracanal post material.

M3 - Article

SN - 0287-4547

JO - Dental Materials Journal

JF - Dental Materials Journal

M1 - http://dx.doi.org/10.4012/dmj.2018-040

ER -