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Contemp Clin Dent. 2018 Sep;9(Suppl 2):S347-S353. doi: 10.4103/ccd.ccd_483_18.

Flexural Strength of Surface-Treated Heat-Polymerized Acrylic Resin after Repair with Aluminum Oxide-Reinforced Autopolymerizing Acrylic Resin.

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Department of Prosthodontics and Crown and Bridge, MGM Dental College and Hospital, Navi Mumbai, Maharashtra, India.
Department of Prosthodontics and Crown and Bridge, Coorg Institute of Dental Sciences, Virajpet, Karnataka, India.
Department of Biochemistry, Royal Dental College, Palakkad, Kerala, India.



A fracture of denture base in situ often occurs through a fatigue mechanism, which over a period of time leads to the formation of small cracks, resulting in fracture.

Aim and Objective:

To evaluate the flexural strength of repaired heat-polymerized acrylic resin, with different percentage of aluminum oxide (Al2O3) added to the repair resin and effect of two different surface treatments on the flexural strength of repaired heat-polymerized acrylic resin and also to evaluate quantification of filler particles using scanning electron microscopy.

Materials and Methodology:

Fifty specimens of heat-polymerized acrylic resin were prepared according to the American Dental Association specification no. 12 (65 mm × 10 mm × 2.5 mm). Al2O3<50 nm particle size was silanized using metal alloy primer before incorporation in polymer. Two different percentages of Al2O3 nanoparticles, that is, 1% and 1.5% were added to autopolymerizing acrylic resin which was used as repairing material.


The study showed that repair resin incorporated with 1.5% Al2O3 in the group surface treated with silicon carbide paper improved the flexural strength of denture base resin. A proper filler distribution and deep penetration within the polymer matrix were observed by scanning electron microscope in the same group.


Aluminum oxide nanoparticles; flexural strength; polymethyl methacrylate; silane coupling agent

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