Effect of novel cycloaliphatic comonomer on surface roughness and surface hardness of heat-cure denture base resin

Abstract

A BSTRACT Background: Polymethyl methacrylate (PMMA) is a widely used resin in the field of prosthodontics for fabricating myriad orofacial prostheses. Albeit several advantages, it possesses certain lacunae concerning physicomechanical properties. Purpose: This in vitro research aimed to evaluate the surface roughness (SR) and hardness (SH) of heat-cured PMMA processed with a cycloaliphatic monomer, tricyclodecane dimethanol diacrylate (TCDDMDA), in methyl methacrylate at various concentrations. Materials and Methods: Groups have been divided into control (SRC and SHC) and experimental groups (SR10 and 20; SH10 and 20). Forty-five PMMA disc specimens were prepared. SR was assessed using a nanomechanical testing machine and the arithmetic roughness (Ra) was recorded. The same specimens were then subjected to Vicker’s microhardness testing and Vicker’s hardness number (VHN) was obtained. Data were compared using one-way analysis of variance (ANOVA) and post hoc Bonferroni tests ( α =0.05). Results: The mean (standard deviation [SD]) of SRC, SR10, and 20 groups were 111.415 nm (0.789), 62.666 nm (0.482), and 41.004 nm (0.561), respectively. The mean (SD) VHN of SHC, SH10, and 20 groups were 21.003 (0.252), 23.975 (0.207), and 34.622 (0.079), respectively. Conclusion: The addition of TCDDMDA markedly decreased the SR and increased the SH of the experimental groups.

A Comparison of the Surface and Mechanical Properties of 3D Printable Denture‐Base Resin Material and Conventional Polymethylmethacrylate (PMMA)

“…8,26 3D printed denture-base resin groups exhibited lower surface hardness in comparison to the conventionally heat-polymerized group which might be associated to the level of residual monomers as residual monomer content was found to adversely affect the surface hardness. 17, 26 Farina et al 27 reported that homogenous heating of PMMA produced higher monomer conversion, less plasticizing effect of residual monomers, and hence an increased surface hardness. A study by Prpić et al 8 found that the surface hardness of milled and heat-polymerized PMMA was higher when compared to 3D-printed materials.…”

“…Hardness is a measure of how resistant a material is to localized plastic deformation caused by mechanical indentation or abrasion 8,17 . Dentures made of low‐surface‐hardness materials can be damaged by mechanical brushing, resulting in plaque retention and pigmentation, which can reduce denture life 8,26 . 3D printed denture‐base resin groups exhibited lower surface hardness in comparison to the conventionally heat‐polymerized group which might be associated to the level of residual monomers as residual monomer content was found to adversely affect the surface hardness 17,26 .…”

Effect of Novel Cycloaliphatic Comonomer Incorporation on the Color Stability of Thermo-polymerized Denture Base Resin

“…The high color stability of G10 and G20 can also be substantiated with a higher degree of conversion, less or negligible unreacted residual monomer, and smoother surfaces than the G0 group. [ 15 17 ]…”

“…[ 14 15 ] This novel copolymer P(MMA- Co -TCDDMDA) exhibited better mechanical properties and biocompatibility than the conventional P(MMA). [ 16 17 18 19 ] However, there are no literature concerning the color stability of this copolymer. Hence, the present study aims to evaluate the color stability of P(MMA- Co -TCDDMDA) copolymer at 10% and 20% (vol/vol) concentration of TCDDMDA comonomer in MMA monomer.…”

Bond Strength of Acrylic Denture Tooth to a Novel Thermo-Polymerized Denture Base Copolymer Containing Cycloaliphatic Comonomer after Mechanical and Thermal Aging

“…[ 16 17 ] This novel copolymer P(MMA- Co -TCDDMDA) exhibited better mechanical properties and biocompatibility than the conventional P(MMA). [ 18 19 20 21 ] However, there is no literature concerning the bond strength of P(MMA- Co -TCDDMDA) copolymeric resin base to artificial teeth. There are different types of artificial teeth, including methacrylate resin, composite resin, and porcelain teeth, each with its advantages and disadvantages.…”