The Effect of Thyme and Nigella Oil on Some Properties of Acrylic Resin Denture Base

Abstract

Aims: To evaluating the preferable properties and concentrations of Genuine Nigella sativa and Thyme as oil low cost additive biocompatible antibiotic materials of denture base acrylic powder inrelation to the commercially available heat cure acrylic resin material. Materials and Methods: One hundred and sixty acrylic resin Major heat cured samples were prepared without additives (Control), and with additives (A pure natural oil of Nigella sativa and Thyme 0.5%, 1%, 1.5%, and 2%) to evaluate transverse strength, indentation hardness, color property, residual monomer, dimensional accuracy, porosity, measurement of IR spectra, and anti-microbial-sensitivity tests. Results: Results showed a significant difference to P= 0.05. The addition of Thyme and Nigella oil increased the transverse strength, and hardness of the denture base materials, no porosities, an increase in residual monomer elution at 1 st day, and both additives Nigella and Thyme oil act as antibacterial materials. Conclusions: The additives materials of pure natural oil of Nigella sativa and Thyme with concentration of 1.5% were recommended to give a proper properties, and as antimicrobial after curing of the acrylic resin denture base, but Thyme oil showed no effect on the color after curing in relation to Nigella sativa

Evaluation of Addition of Plant Fixed Oil Extracts (Ginger , Maramia, Eucalyptus) on Some Properties of Heat Cured Denture Base Material

“…This may be due to that the oil will coat the polymer particles and this coating will decrease the amount of conversion of monomer to polymer and some unreacted mono-mer are left in the polymerized material, so this will weaken the mechanical strength of the resin. (14) This results disagree with Hatim et al 2010 (15) that may be due to the type of essential oil used in the study or the difference in oil concentration applied. The hardness test: The Rockwell hardness test is based on the ability of the surface of any material to resist the penetration of a specific tip with a given load for a specific time.…”

“…The hardness test: The Rockwell hardness test is based on the ability of the surface of any material to resist the penetration of a specific tip with a given load for a specific time. In our study, there is a significant difference between the control and additive groups, there is a significant difference between the two concentration for all additive groups with higher hardness for 1.5% concentration, this may be due to unreacted monomer with oil coated polymer and this can explained by water sorption phenomenon of methylmethacrylate denture base material (15,16,17) .It has been proven that there is a relationship between residual monomer and water sorption, if residual monomer is present, less monomer conversion occur and may result in increasing sorption, as water sorption increase the hardness increase agree with Hatim et al 2010 (15) and these two properties related to surface properties (18) . Residual monomer According to the results at the 1 st day show higher residual monomer release this can explained by the uncoated particles with oil cause faster monomer release.…”

“…Residual monomer According to the results at the 1 st day show higher residual monomer release this can explained by the uncoated particles with oil cause faster monomer release. At the 2 nd day the elution from additive groups increase with significantdifference to control ( the day we test the hardness and transverse strength) due to unreacted monomer coated with oil (15) , then continue by gradual longer lasting elution of monomer (19) with no significant difference between tested groups.…”

The Effect of Thermal Cycling on The Fitness of Modified Heat Cured Acrylic Resin Maxillary Denture Base

“… Modified samples: 40 samples of heat cured acrylic resin maxillary denture base with the addition of : a-1% Chlorohexidine gluconate (28) (10 samples). b-1.5% Nigella oil (29) (10 samples). c-c-1.5% Thyme oil (29) (10 samples).…”

Study Compression, Hardness and Density properties of PMMA Reinforced by Natural Powder Used in Denture Base applications

“…Hatim et al were studied the effect of Genuine Nigella sativa and Thyme as oil to denture base resin in different percentages of (0.5%, 1%, 1.5%, and 2%) by weight and the (transverse strength, indentation hardness, color property, residual monomer, dimensional accuracy, porosity, measurement of IR spectra, and anti-microbial-sensitivity tests) were determined. The results were as the following: the additives of natural oil of Nigella sativa and Thyme with concentration of 1.5% were recommended to give proper properties, as antimicrobial after curing of the acrylic resin denture base, but Thyme oil showed no effect on the color after curing in relation to Nigella sativa [4]. Mansour et al estimated the effectiveness of reinforcing by mica on the mechanical properties (three-point bending and micro hardness) of Poly (Methyl Methacrylate) resin (PMMA).…”