Chemical Structure and Physical Properties of Heat-cured Poly(methyl methacrylate) Resin Processed with Cycloaliphatic Comonomer: An In Vitro Study

Abstract

Aim:The purpose of this in vitro research is to chemically characterize polymethyl methacrylate (PMMA) processed with 10% and 20% (v/v) tricyclodecane dimethanol diacrylate (TCDDMDA) comonomer. It also aimed to assess the degree of conversion (DC) and glass transition temperature (T g ) of the formed copolymers. Materials and methods: The experimental groups were processed with the TCDDMDA comonomer (10% and 20% v/v), whereas the control group was processed only with the methyl methacrylate monomer. The copolymerization was studied by nuclear magnetic resonance (NMR) spectroscopy. The surface characteristics and composition (wt%) were studied by field-emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX) spectroscopy (cuboidal specimen; 5 mm × 5 mm × 3 mm), respectively. The DC and T g of the formed copolymers (powdered form) were analyzed by Fourier transform infrared spectroscopy and differential scanning calorimetry, respectively. One-way analysis of variance with post hoc Bonferroni test was used to compare the mean values of DC% and T g among the groups. Results: The newly formed copolymer [P(MMA-co-TCDDMDA)] was chemically characterized by NMR and FESEM-EDX. The DC and T g of the experimental groups were higher than the control. Tricyclodecane dimethanol diacrylate at 20% (v/v) concentration showed the highest DC and T g . Conclusion:The addition of TCDDMDA comonomer improved the DC and T g of the formed copolymer. Clinical significance: The P(MMA-co-TCDDMDA) copolymer is expected to improve the mechanical properties and biocompatibility of the denture base acrylic resin. This would result in improved denture quality and durability, thereby, imparting a better quality of life to the geriatric population.

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

“…TCDDMDA complemented the thermo-polymerization by decreasing the residual monomer content. [ 16 17 ] The results of the present research unveiled that G0 specimens possessed the least bond strength values. This is attributable to the existence of residual monomer which exhibits a plasticizing effect, thereby deteriorating the mechanical properties of the acrylic resins and jeopardizing the resin tooth–base resin interfacial adhesion.…”

“…A recently identified cycloaliphatic cross-linking comonomer, tricyclodecane dimethanol diacrylate (TCDDMDA), has been copolymerized with P(MMA). [ 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.…”

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 ]…”

“…[ 13 ] A recently identified cycloaliphatic crosslinking comonomer, tricyclodecane dimethanol diacrylate (TCDDMDA), has been copolymerized with P(MMA). [ 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.…”

Shade Matching in Fixed Partial Denture Patients

“…Colour matching in aesthetic restorative material with the natural teeth is the common approach in shade matching . 1,2 .The aesthetic success is dependent upon the close shade matching between the dental restoration and the adjacent teeth 3,4 .The shade matching is done to adapt restoration with the surrounding tissues 5,6,7,8 . The demanding aspect within the aesthetic dentistry is regarding the duplication and characterisation of colour 5,9,10 .The shade perception is psychophysiological response it is regulated by the human eyes and sensory structures of brain towards the reflection of light spectrum from any object 2,11,12 .Some elements give direct demand and impact on the colour of a restoration 13,14 .The common elements that gives impact includes lightning conditions, thickness of porcelain, soft tissue colour, core material, soft tissue shade selection system, firing process and fabrication 15,16,17 .…”