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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.

Author information

1
Department of Prosthodontics and Crown and Bridge, MGM Dental College and Hospital, Navi Mumbai, Maharashtra, India.
2
Department of Prosthodontics and Crown and Bridge, Coorg Institute of Dental Sciences, Virajpet, Karnataka, India.
3
Department of Biochemistry, Royal Dental College, Palakkad, Kerala, India.

Abstract

Background:

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.

Results:

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.

KEYWORDS:

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

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