Effect of chemical surface treatments and repair material on transverse strength of repaired acrylic denture resin

<b>Purpose:</b> This study was performed to evaluate the transverse strength of a denture base resin (H), repaired with an autopolymerizing acrylic resin (A) or a visible light-curing (VLC) resin (T) following the use of three chemical solvents: methyl methacrylate monomer, aceton or chl...

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Bibliographic Details
Main Authors: Vojdani Mahroo (Author), Rezaei Sakineh (Author), Zareeian Lila (Author)
Format: Book
Published: Wolters Kluwer Medknow Publications, 2008-01-01T00:00:00Z.
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Summary:<b>Purpose:</b> This study was performed to evaluate the transverse strength of a denture base resin (H), repaired with an autopolymerizing acrylic resin (A) or a visible light-curing (VLC) resin (T) following the use of three chemical solvents: methyl methacrylate monomer, aceton or chloroform. <b> Materials and Methods: </b> Eighty specimens (65.0 x 10.0 x 3.3 mm) of H were fabricated and stored in distilled water at 37&#x00B0;C for seven days. Specimens were divided into eight equal groups of 10. In each group, specimens were sectioned in the middle to create a 10 mm gap. Two groups served as controls and had no surface treatment. They were repaired with A or T materials. In the remaining six experimental groups, specimen surfaces were treated with ac for 30 sec or mma for 180 sec or ch for 5 sec. Then A or T material was placed on the treated surfaces, using the same preparation molds. After seven days&#x2032; storage at 37&#x00B0;C, the transverse bond strength (MPa) of the specimens was measured using a three-point bending test. A two-way ANOVA and a Tukey HSD were performed to identify significant differences (<i> P</i> &lt; 0.05). The nature of the failures was noted as adhesive, cohesive or mixed. <b> Results:</b> Significant differences were found between the controls and experimental groups (<i> P</i> &lt; 0.05). In the control groups, repair with A showed significantly higher strength (60.3 MPa) than those repaired with T (51.3 MPa). Mean transverse strength of experimental specimens repaired with A was (75.06 MPa) which was significantly greater than those repaired with T (67.9 MPa). Although surface treatment increased repair strength, no significant differences were detected between the effects of the chemical etchants. <b> Conclusions:</b> The autopolymerizing resin exhibited significantly higher repair strength than VLC resin. The transverse strength of the repaired specimens was increased significantly after chemical treatments.
Item Description:0970-9290