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

Abstract

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 subjected to 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 fibers without 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 ® POST; MTT assay confirmed the absence of any toxic eluents, indicating its feasibility as new intracanal post material.

Bond strength of a new Kevlar fiber-reinforced composite post with semi-interpenetrating polymer network (IPN) matrix

“…The experimental KF posts were prepared from surface treated Kevlar fibers and Bis-GMA/TEGDMA/PMMA semi-IPN polymer matrix as described earlier by Almaroof et al (9). A total of 40 posts with a diameter of 1.5 mm were used for the test; 20 ES (GC Corporation, Tokyo, Japan) and 20 KF posts both consisting of the semi-IPN matrix polymer.…”

“…In our previous study, a new post material based on the semi-interpenetrating polymer network (IPN) reinforced with Kevlar fibers was reported (9). The ability of Kevlar fibers to reinforce polymeric matrices prompted the study and were used to reinforce 2, 2-Bis [4- (2-hydroxy-3 methacryloyloxypropyl)-phenyl] propane (Bis-GMA) and tri-ethylene glycol dimethacrylate (TEGDMA)/ Polymethyl methacrylate (PMMA) semi-IPN matrix with titanium dioxide (TiO2) nanofiller composite and characterized to function as a new intracanal fiber post.…”

Development and Assessment of New Bioactive Glass Fiber Post. Part II: Ion’s Release

“…Unidirectional E-glass fibres bundles with 8-15μm filament diameter and 2,58 g/cm3 density which their chemical composition mention in (Table1) was treated by 99.9% acetic acid (Chem-Lab NV, Belgium) for 2h at 55 °C, washed three times with purified water and dried in the incubator for 8 h at 50 ° C. A part of the acetic acidtreated glass fiber was further exposed to wet salination by means of 2% of 3-methacryloxyproyltrimethoxysilane silane coupling agent A-174 (Sigma-Aldrich, Germany) in an ethanol-water mixture (90/10 w/w) acidified to pH 3.8 and maintained at this level with glacial acetic acid. The glass fiber was processed for 1 h in this solution and then dried for two h at 110 ° C before usage, as in previous studies [13,14] . The fiber's surface texture and morphology were examined by scanning electron microscopy (TESCAN VEGA III, TESCAN, Czech Republic) with an accelerating voltage of 5KeV as well as a magnification of (1Kx, 2Kx, and 5Kx).…”

“…The impregnation procedure of the fiber to resin cement base on hand lay-up moulding technique was the first step in fabrication [13] , in which the PTFE mould fixed to a glass slide and Mylar strip, then the resin cement and the treated fiber added and painting layer by layer until the mould filling. Later, another mylar strip and glass slide were positioned over the mould and pressed with (1 Kg) weight to level up the specimen surface and prevents the development of bubbles and an oxygen-inhibited layer.…”

Effect of Interpenetrating Polymer Network (IPN) Thermoplastic Resin on Flexural Strength of Fibre-Reinforced Composite and the Penetration of Bonding Resin into Semi-IPN FRC Post

“…For mechanical testing, three-point bending tests have been universally used to test the flexural properties of composite materials. Previously, many studies which compare cross-linked polymer FRC to IPN FRC, have been done and the mechanical properties of FRC materials evaluated [ 4 , 12 , 13 ]. The fracturing of FRC caused by biting forces should be avoided, especially in the posterior molar areas.…”