Effect of ethanol treatment on mechanical properties of heat-polymerized polymethyl methacrylate denture base polymer

Abstract

This laboratory study was assessing the nano-mechanical properties (NMP), surface roughness (Sa), and topographic changes caused by ethanol on the surface of heat-polymerized denture base polymers at different time past dough stage. Specimens of heat polymerizing acrylic resin (Interacryl Hot, Interdent, Celje, Slovenia) of size 10×10×3 mm were prepared, wet ground, and polished for uniform smoothness and treated with ethanol in concentrations of 40, 70, and 99.9% for 30, 60, and 120 s and statistical analysis was done. Some statistical significance for Sa were highest with 120 s exposure to 40% ethanol. NMP were the highest for specimens treated with 99.9% ethanol concentration for 120 s, on specimens prepared 30 min past the dough stage. This study suggested that heat-polymerized denture base polymers are prone for changes by ethanol which alters mechanical properties and surface topography. Dough time influenced the ethanol resistance.

Long‐term stainability of interim prosthetic materials in acidic/staining solutions

“…To obtain the HPAR, APR, and BR specimens, a stainless steel matrix (80 × 40 × 3 mm) with 10 perforations of 10 × 10 × 3 (± 0.005) mm 9 was used, coupled with a metallic muffle (MAC; Dental Articles and Prosthesis Ltd., Sao Paulo, Brazil). In the HPAR group, the HPAR was manipulated and polymerized according to the manufacturer's recommendations under a pressure of 1000 kg for 30 minutes and a water bath at 100°C for 1 hour in an automatic thermopolymerizer (Thermopolymerizer Solab; Solab Equipment for Laboratory Ltd., Piracicaba, Sao Paulo, Brazil) . In the APR group, APR was manipulated according to the manufacturer's recommendations (ratio equivalent to the volume of 3:1), placed inside the metallic matrix, and the final polymerization was performed under a pressure of 1000 kg in a bench press.…”

Characterization of the mechanical properties of CAD/CAM polymers for interim fixed restorations

“…This might be attributed to its flexibility since Zirkonzahn Multistratum flexible consists of a thermoplastic resin, which is a linear polymer without cross-linking agent as stated by the manufacturer 37,38) . Interestingly, the THF solvent treatment test did not reveal dissolving of surface which may suggests that the polymer structure although it was linear (not cross-linked) was syndiotactic or isotactic providing better capability to resist effects by solvents [38][39][40][41] .…”

Interfacial Adhesion of a Semi-Interpenetrating Polymer Network-Based Fiber-Reinforced Composite with a High and Low-Gradient Poly(methyl methacrylate) Resin Surface

“…This occurrence may facilitate the diffusion of the phosphate ester monomers of the primer and the dimethacrylate component of the resin luting cement into the PMMA layer of the FRC. The polymer chain mobility and radical diffusion rates have already been determined using ethanol [22], and the effect of ethanol on PMMA has been thoroughly investigated in previous studies [23,24]. In contrast, the adhesion of the resin luting cement to the ground FRC was inadequate with the G-Multi PRIMER treatment.…”