Influence of surface treatments on the flexural strength of denture base repair

Abstract

Influence of surface treatments on the flexural strength of denture base repairObjective: The purpose of this study was to evaluate the flexural strength of repairs made with autopolymerising acrylic resin after different treatments of joint surfaces. Material and Methods: Fifty rectangular specimens were made with heat-polymerised acrylic resin and 40 were repaired with autopolymerising acrylic resin following joint surface treatments: group 1 (intact specimens), group 2 (chemical treatment: wetting with methyl-methacrylate for 180 s), group 3 (abraded with silicon carbide paper), group 4 (abraded and wetting with methyl-methacrylate for 180 s) and group 5 (without surface treatment). The flexural strength was measured by a three-point bending test using a universal testing machine with a 100 Kgf load cell in the centre of repair at 5 mm/min cross-head speed. All data were analysed using one-way ANOVA and Tukey HSD test for multiple comparisons (p < 0.05). Results: Among repaired specimens, groups 2 and 4 had 66.53 ± 3.4 and 69.38 ± 1.8 MPa mean values and were similar. These groups had superior flexural strength than groups 3 and 5 that were similar and had 54.11 ± 3.4 and 51.24 ± 2.8 MPa mean values, respectively. Group 1 had a mean value of 108.30 ± 2.8 MPa being the highest result. Conclusion: It can be concluded that the treatment of the joint surfaces with methyl-methacrylate increases the flexural strength of denture base repairs, although the strength is still lower than that observed for the intact denture base resin. Abrasion with sandpaper was not able to influence the flexural strength of repaired denture bases.

The effect of joint surface contours and glass fiber reinforcement on the transverse strength of repaired acrylic resin: An in vitro study

“…To overcome this problem, various methods for enhancing the strength of the repaired part have been advocated; these include the alteration of repair surface design,[ 6 7 8 9 ] the use of repair surface treatments,[ 5 10 11 ] and combined use of autopolymerizing acrylic resin with reinforcing materials. [ 5 12 13 ]…”

Effect of Graphene Oxide Incorporation on the Strength of Denture Repair Resin

“…6,15,20 Chemical agents such as MMA, chloroform, acetone, or methylene chloride are used to increase the bond strength between base acrylic and repair acrylic. 16,20 Pereira et al evaluated the bending strength of repaired PMMA specimens by applying different surface treatments (silicon carbide sanding, monomer soaking, and both monomer soaking and sanding). It has been reported that specimens repaired by soaking with monomer have higher flexural strength.…”

“…It has been reported that specimens repaired by soaking with monomer have higher flexural strength. 16 In the present study, both bevel-shaped specimen surfaces were prepared, and repair acrylic was applied after wetting the repair surfaces with monomer for 180 s in order to increase the strength of the specimens in light of all these previous studies.…”

“…The repair surfaces were treated with methyl methacrylate monomer (MMA) liquid for 180 s using a micro brush. 6,16 The AP acrylic resin repair material was mixed according to manufacturer recommendations and packed into a repair area within the mold for G II. G III specimens were repaired with HA acrylic resin.…”

Influence of Different Repair Acrylic Resin and Thermocycling on the Flexural Strength of Denture Base Resin

“…Researchers attempted to improve fracture resistance by incorporating various reinforcing agents like glass fiber [16], carbon fiber [17], metal mesh [18], and polyethylene fibers [19]. Alternatively, surface treatment of the fracture site with acetone [20] and chloroform [21] was recommended by a few investigators. Previous researchers have also suggested different fracture edge profile modifications [22] and roughened internal surface [23] to enhance the surface area.…”