This study aims to evaluate the effect of the addition of chlorohexidine gluconate (CHX) (powder) on some physical, mechanical properties and antimicrobial effect. In this study two hundred and forty samples of heat cured acrylic resin (Major base-2) were prepared and divided into different groups.
Control group (without the addition of CHX) and experimental groups (with the addition of CHX (powder) at (1%, 2%, 3%)) to evaluate transverse strength, tensile strength, surface hardness, dimensional accuracy, deflection, residual monomer in addition to antimicrobial effect for heat cured acrylic resin before and after the addition of CHX (powder).
Results showed a statistically significant difference at (p0.05) between control and experimental groups. The addition of CHX (powder) into heat cured acrylic resin increases its flexibility in addition to it's antimicrobial effect. Group of 1% CHX has the highest value of transverse strength, tensile strength, surface hardness and dimensional accuracy after control group.
In addition to its antimicrobial effect, CHX increases the flexibility of heat cured acrylic resin. As the concentration of added CHX increased, the flexibility of heat cured acrylic resin specimens will be increased.
Table of Contents
1. Abstract
2. Materials and Methods
2.1 Evaluation of transverse strength and deflection
2.2 Evaluation of tensile strength
2.3 Evaluation of surface hardness test
2.4 Evaluation of dimensional accuracy
2.5 Evaluation of residual monomer
2.6 Evaluation of antimicrobial effect
3. Results
4. Discussion
5. Conclusions
6. References
Research Objectives and Core Themes
The primary objective of this study is to assess the impact of adding chlorohexidine gluconate (CHX) powder to heat-cured acrylic resin, specifically investigating its influence on mechanical properties, physical stability, and antimicrobial efficacy.
- Evaluation of physical properties including dimensional accuracy and residual monomer release.
- Mechanical assessment of transverse strength, tensile strength, surface hardness, and deflection.
- Testing of antimicrobial activity against oral cavity microorganisms.
- Determination of the optimal CHX concentration for improving acrylic resin performance.
- Analysis of the influence of CHX on the flexibility of denture base materials.
Excerpt from the Book
MATERIALS AND METHODS
Two hundred and forty samples of heat cured acrylic resin (Major base 2) were prepared and divided into: Control group: 60 samples of heat cured acrylic resin without the addition of CHX. Experimental group :180 samples of heat cured acrylic resin with the addition of CHX at (1%, 2%, 3%).
Acrylic resin specimens were prepared in a mold made by investing a hard elastic foil for specific dimensions (according to each test as mentioned bellow) in dental stone that were mixed in a water/powder ratio of 32gm/100ml and placed in the lower half of the flask, then glass slab was placed against the first half till the stone set. After final setting of stone, a conventional flashing procedure was used for the preparation of acrylic resin samples(33).
Acrylic resin samples were mixed and manipulated according to manufacturer directions. Cure was taken to avoid porosities due to entrapment of air bubbles. Trail closure was performed. The specimens were cured in water path with conventional curing cycle, the specimens processed at 74°C for 90 minutes, then the temperature of water path raised to boiling 100°C for 30 minutes(according to manufacture instructions). The samples left for bench cooling for 30 minutes then it finished using tungsten drill and sand paper at low speed (34). All samples used in this study were evaluated for the presence of porosity by examining them under reflecting light microscope(LOMO Micmed 2) before being tested ( 6, 35, 36) . After that the samples stored in distilled water at 37°C for two periods of time (2days and 7 days), then the following tests were done to evaluate:
Summary of Chapters
Abstract: Provides a concise overview of the study's aim to evaluate CHX addition on acrylic resin and summarizes the key findings regarding improved flexibility and antimicrobial activity.
Materials and Methods: Details the preparation of 240 acrylic resin samples and describes the specific protocols for the six mechanical, physical, and biological tests conducted.
Results: Presents the statistical analysis of the laboratory tests, highlighting the significant differences observed in samples treated with varying concentrations of CHX over 2 and 7-day periods.
Discussion: Interprets the findings by linking the observed changes in polymer lattice and residual monomer release to the mechanical performance of the modified acrylic resin.
Conclusions: Summarizes the final verdict that CHX addition enhances the flexibility of heat-cured acrylic resin while maintaining antimicrobial properties.
References: Lists the academic literature and previous studies that informed the methodology and discussion of this research.
Keywords
CHX, acrylic resin, flexibility, heat-cured, transverse strength, tensile strength, surface hardness, antimicrobial effect, residual monomer, dental materials, denture base, chlorohexidine gluconate, polymerization, oral cavity, mechanical properties.
Frequently Asked Questions
What is the core focus of this research paper?
The study investigates the physical, mechanical, and antimicrobial effects of incorporating chlorohexidine gluconate (CHX) powder into heat-cured acrylic resin used for dental prostheses.
What are the central themes covered?
The research covers material science in dentistry, specifically addressing the modification of denture base materials to improve patient comfort, durability, and infection control.
What is the primary research question?
The study asks how the addition of different concentrations (1%, 2%, 3%) of CHX powder affects the mechanical properties and antimicrobial performance of heat-cured acrylic resin.
Which scientific methods were employed?
The researchers used an Instron universal machine for bending tests, a Rockwell hardness tester, UV spectrophotometry for monomer analysis, and disk-diffusion tests for antimicrobial evaluation.
What subjects are discussed in the main body?
The main body details the experimental design, the specific curing and testing protocols, and an extensive statistical analysis of the results (ANOVA and Duncan's test).
Which keywords characterize this work?
Key concepts include CHX, acrylic resin, flexibility, antimicrobial efficacy, and mechanical strength properties.
How does CHX concentration affect the flexibility of the resin?
The study concludes that as the concentration of CHX increases, the flexibility of the heat-cured acrylic resin specimens also increases due to the formation of gaps in the polymer lattice.
What were the findings regarding residual monomer release?
The 1% CHX group showed the lowest residual monomer release, suggesting that lower concentrations of this additive may be more favorable for maintaining material stability.
- Quote paper
- Amer Taqa (Author), Nada Z. Mohammed (Author), Alia'a W. Alomari (Author), 2011, The Effect of Addition Chlorohexiidine Gluconate (Powder) on the Properties of Heat Cured Acrylic Resin, Munich, GRIN Verlag, https://www.grin.com/document/431815
