scholarly journals Avaliação de soluções antifúngicas de guanidina para resina base de dentadura: um estudo in vitro

2020 ◽  
Vol 61 (2) ◽  
pp. 39-49
Author(s):  
Maria Eduarda Rodrigues Gama ◽  
Vicente Castelo Branco Leitune ◽  
Isadora Martini Garcia ◽  
Stéfani Becker Rodrigues ◽  
Fabrício Mezzomo Collares
Keyword(s):  
Surface Roughness ◽  
Antifungal Activity ◽  
Flexural Strength ◽  
Guanidine Hydrochloride ◽  
Acrylic Resin ◽  
Control Group ◽  
Distilled Water ◽  
Acrylic Resins ◽  
Polyhexamethylene Guanidine

Background: The purposes of this study were: (1) to formulate polyhexamethylene guanidine hydrochloride (PHMGH) solutions at different concentrations; (2) to evaluate their antifungal activity against a mature biofilm of Candida albicans on acrylic resins; (3) to evaluate possible effects on acrylic resins flexural strength and surface roughness. Methods: PHMGH solutions were formulated with distilled water and 0.125, 0.250, or 0.5 wt.% of PHMGH. One group without PHMGH was used as control. For antifungal activity analysis, acrylic resin specimens were contaminated with C. albicans. Specimens were immersed in PHMGH solutions or distilled water for 5 or 10 min. Ultimate flexural strength and surface roughness of acrylic resins were evaluated. Results: All PHMGH solutions at 5 or 10 min showed antifungal activity compared to the control group (p

scholarly journals Effect of Different Dentifrices on the Surface Roughness of Acrylic Resins: An in vitro Study

2017 ◽  
Vol 18 (8) ◽  
pp. 679-682
Author(s):  
Nitin Gautam ◽  
Aditi Sharma ◽  
Unjum Bashir ◽  
Sisir Rapolu ◽  
Nallamilli Mamatha ◽  
...  
Keyword(s):  
Surface Roughness ◽  
In Vitro Study ◽  
Positive Association ◽  
Acrylic Resin ◽  
Control Group ◽  
Distilled Water ◽  
Acrylic Resins ◽  
Type Size ◽  
Utmost Care

ABSTRACT Aim This study was undertaken to study the effect of three most commonly used dentifrices for denture cleaning and to find out any positive association between number of strokes by toothbrush and surface roughness of acrylic resin. Materials and methods About 40 acrylic rectangular blocks with high finish were polished until surface roughness was calculated as 0 µm. The materials tested were distilled water as a control group, Patanjali Dant Kanti, Colgate Total Cream, and Cleansodent as dentifrices. Stroking was done with dentifrices, and surface roughness readings were recorded at 1,000, 9,000, and 18,000 strokes. Results Patanjali Dant Kanti was found to have maximum abrasive potential followed by Colgate Total Cream, followed by Cleansodent and least by distilled water. Conclusion Surface roughness was found to be directly proportional to the type, size, and fineness of the abrasive component used; the professional denture cleanser (Cleansodent) has less abrasive potential than the regular toothpastes. Among those tested, the highest abrasive potential was found in Patanjali Dant Kanti and lowest by Cleansodent (denture cleanser). Clinical significance The patient as well as dentist should choose the dentifrice with utmost care noting the size and type of abrasives used. Washing the dentures normally with water without toothbrush daily and cleaning of dentures once in 10 to 15 days with a soft toothbrush and professional denture cleanser should be the line of maintenance of dentures. How to cite this article Gautam N, Sharma A, Bashir U, Rapolu S, Mamatha N, Sravani S. Effect of Different Dentifrices on the Surface Roughness of Acrylic Resins: An in vitro Study. J Contemp Dent Pract 2017;18(8):679-682.

scholarly journals A Comparative Evaluation of Flexural Strength of Commercially Available Acrylic and Modified Polymethylmethacrylate: An in vitro Study

2013 ◽  
Vol 14 (1) ◽  
pp. 80-83 ◽  
Author(s):  
Naveen S Yadav ◽  
Teerthesh Jain ◽  
Amrita Pandita ◽  
SMA Feroz ◽  
UK Kartika ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Methacrylic Acid ◽  
Comparative Evaluation ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Bending Test ◽  
Control Group ◽  
Diabetic Patients ◽  
Denture Stomatitis

ABSTRACT Aim The purpose of this study was to evaluate and compare the flexural strength of commercially available acrylic (trevalone) and modified polymethylmethacrylate (PMMA). Materials and methods Four groups were tested; Group 1— control group regular MMA, group 2—2% methacrylic acid, 88% MMA, group 3—16% methacrylic acid, 84% MMA group 4— 20% methacrylic acid, 80% MMA 15 resin specimens of each group were polymerized. After processing, the specimens were subjected for flexural strength testing using three point bending test in a Universal Testing Machine. All data was statistically analyzed with one-way ANOVA, differences within the groups were analyzed by Scheffe's analysis. Results As the ratio of incorporated methacrylic acid to PMMA increased, the flexural strength decreased. Analysis of data revealed a significant decrease in flexural strength of specimens (p < 0.000) after incorporation of 12%, 16%, 20% methacrylic acid to heat polymerized acrylic resin, when compared with the control group. Lowest flexural strength was observed with specimens containing 20% methacrylic acid and highest flexural strength was observed with specimens containing conventional monomer without methacrylic acid. Conclusion It was observed that as the concentration of methacrylic acid in heat polymerized acrylic resin increases, the flexural strength decreases. Lowest flexural strength was observed with specimens containing 20% methacrylic acid and highest flexural strength was observed with specimens containing conventional monomer without methacrylic acid. Clinical significance The major advantages of addition of methacrylic acid to polymethylmethacrylate could be for the elderly people with restricted manual dexterity or cognitive disturbances, especially for patients who do not follow an adequate denture cleansing protocol and diabetic patients who are more susceptible for denture stomatitis. How to cite this article Jain T, Yadav NS, Pandita A, Feroz SMA, Kartika UK, Singh PP. A Comparative Evaluation of Flexural Strength of Commercially Available Acrylic and Modified Polymethylmethacrylate: An in vitro Study. J Contemp Dent Pract 2013;14(1):80-83.

scholarly journals Influence of Silver Nanoparticles on the Specific Properties of Acrylic Resin for Ocular Prosthesis

2018 ◽  
Vol 11 (3) ◽  
pp. 1573-1581 ◽  
Author(s):  
Maha M. Turki ◽  
Faiza M. Abdul-Ameer
Keyword(s):  
Surface Roughness ◽  
Impact Strength ◽  
Flexural Strength ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Acrylic Resin ◽  
Control Group ◽  
Mean Values ◽  
The Mean ◽  
Group B

Scleral acrylic resin is widely used to synthesize ocular prosthesis. However, the properties of this material change over time, thus requiring the prosthesis to be refabricated. Many studies were conducted to improve these properties by reinforcing this material with nanoparticles. This study aims to evaluate the effect of silver nanoparticle powder on the mechanical properties (transverse flexural strength, impact strength, shear bond strength, surface microhardness, and surface roughness) of scleral acrylic resin used for ocular prostheses. Two concentrations were selected from the pilot study and evaluated for their effects on scleral acrylic resin properties. According to the pilot study, 0.01 and 0.02wt% AgNPs powder improved the transverse flexural strength, microhardness, and surface roughness compared with other percentages. The specimens in the main study were divided into (3) main groups, (50) specimens without additives (control group A), (50) experimental specimens (with 0.01wt% AgNPs group B), and (50) experimental specimens (with 0.02 wt% AgNPs group C). Each group was subdivided into (5) equal subgroups depending on the tests used. The data were studied using one way ANOVA and post hoc LSD test. At 0.01 wt% AgNPs addition, the mean values of transverse flexural strength insignificantly increased (p> 0.05), and those of impact strength and shear bond strength significantly increased (p< 0.05) compared with those of the control group. At 0.02 wt% AgNPs addition (group C), the mean value of transverse flexural strength significantly increased (p< 0.05), that of impact strength insignificantly increased (p> 0.05), and that of shear bond strength increased with high significance (p< 0.01) compared with those of the control group. Group C showed insignificant increase in the mean values of transverse flexural strength, impact strength, and shear bond strength (p. 0.05) compared with group B. The scleral acrylic resin added with 0.01 and 0.02 wt% AgNPs showed insignificant increase in microhardness and insignificant decrease in surface roughness. The addition of AgNPs powder in both concentrations improved the mechanical properties of scleral acrylic resin used for ocular prostheses.

scholarly journals Antimicrobial and mechanical acrylic resin properties with silver particles obtained from Fusarium oxysporum

2018 ◽  
Vol 21 (1) ◽  
pp. 96 ◽  
Author(s):  
Tabata Prado Sato ◽  
Celio Ilidio Conjo ◽  
Rodnei Dennis Rossoni ◽  
Juliana Campos Junqueira ◽  
Renata Marques de Melo ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Fusarium Oxysporum ◽  
Biofilm Formation ◽  
Antimicrobial Agents ◽  
Acrylic Resin ◽  
Control Group ◽  
Significant Difference ◽  
Color Alteration ◽  
Cie Lab

<p><strong>Objective: </strong>This study evaluated the effects of the incorporation of silver nanoparticles (AgNPs) obtained from <em>Fusarium oxysporum</em> on heat-activated acrylic resin (HAAR) and their influence on resin’s surface roughness, hardness, color alteration and antimicrobial capacity against <em>Candida albicans</em>. <strong>Material and Methods:</strong> For this, 50 discs of HAAR (2x5 mm) were produced and divided into three groups, Control: HAAR; Ag1: HAAR plus 0.539 mg of AgNPs; and Ag2: HAAR plus 1.1 mg of AgNPs. Knopp hardness (HK), surface roughness (Ra and Rz) and color alteration according to the CIE Lab were measured. Specimens were then evaluated <em>in vitro</em> with regard to <em>C. albicans</em> biofilm formation through formed colony count (CFU/mL). Scanning Electron Microscopy (SEM) and Atomic force microscopy (AFM) analyses were performed. <strong>Results:<em> </em></strong>The addition of AgNPs of both concentrations changed Ra, Rz and HK significantly. There was statistically significant difference for L (p=0.00); a*(p=0.00) and b*(p=0.00) parameters. There were no differences between Ag1 and Ag2 biofilm formation, but the comparison of both with the control group presented a significant reduction (p=0.0091) on biofilm formation. SEM and AFM images showed no signs of NPs clustering. <strong>Conclusion:</strong> It can be concluded tha AgNPs incorporation in HAAR was effective in reducing <em>C. albicans</em> activity, with a slight change in color and hardness of the material, being effective therefore, in regions such as the dental prostheses palate, which have lesser aesthetic appeal.</p><p><strong>Keywords</strong></p><p>Acrylic resins; Silver; Antimicrobial agents.</p>

scholarly journals Variations in Flexural Strength of Heat-polymerized Acrylic Resin after the Usage of Denture Cleansers

2016 ◽  
Vol 17 (4) ◽  
pp. 322-326 ◽  
Author(s):  
M Kalavathi ◽  
Mallikarjuna Ragher ◽  
G Vinayakumar ◽  
Sanketsopan Patil ◽  
Aishwarya Chatterjee ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Testing Machine ◽  
Peak Load ◽  
Acrylic Resin ◽  
Control Group ◽  
Denture Base ◽  
Acrylic Resins ◽  
Significant Difference ◽  
Base Resin ◽  
Denture Cleansers

ABSTRACT Objective The objective of this study was to evaluate and compare changes in the flexural strength of heat-cured denture base resins when treated using denture cleansers. Study design A total of 40 specimens with dimension 65 mm length, 10 mm width, and 3 mm thickness were prepared as per ISO 1567 specification. A total of 10 specimens were immersed in distilled water to be used as control. Of the remaining 30 samples, 10 were treated with Clinsodent, 10 with VI-Clean, and 10 with Clanden denture cleansers. Specimens in each group were subjected to three-point flexural load in universal testing machine at a cross-head speed of 5 mm/min. The peak load (N) was recorded and flexural strength was calculated. The findings were analyzed using Kruskal–Wallis analysis of variance and Mann–Whitney test. Results Heat-cured denture base resin selected for this study showed significant difference in flexural strength after immersion in denture cleansers Clinsodent, VI-Clean, and Clanden solutions, when compared with the control group. Conclusion Findings of this study showed that denture cleansers altered the flexural strength of heat polymerized acrylic resins that endured soaking cycles which simulated 180 days of use. Hence, denture cleansers should be used with caution, once a day after brushing the dentures. It is advisable for patients to follow the manufacturer's instructions. How to cite this article Ragher M, Vinayakumar G, Patil S, Chatterjee A, Mallikarjuna DM, Dandekeri S, Swetha V, Pradeep MR. Variations in Flexural Strength of Heat-polymerized Acrylic Resin after the Usage of Denture Cleansers. J Contemp Dent Pract 2016;17(4):322-326.

scholarly journals Influence of Toothbrush Abrasion and Surface Treatments on Roughness and Gloss of Polymer-Infiltrated Ceramics

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3694
Author(s):  
Nawaf Labban ◽  
Mohammad D. Al Al Amri ◽  
Sarah M Alnafaiy ◽  
Saleh M. Alhijji ◽  
Mohammad A. Alenizy ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Mean Value ◽  
Control Group ◽  
P Value ◽  
Distilled Water ◽  
Storage Medium ◽  
Significant Difference ◽  
Toothbrush Abrasion ◽  
Surface Gloss

The aim of this study was to compare the surface roughness and gloss of polymer-infiltrated ceramics after simulated in vitro toothbrushing in different storage mediums. Four polymer- infiltrated ceramics were evaluated, Lava ultimate (LU), Vita enamic (EN), Shofu (SH), and Crystal ultra (CU). The control group was a feldspathic ceramic, Vita Mark II (VM). One hundred and twenty specimens (12 × 14 × 2.5 mm) were prepared using a precision saw. For each material (n = 24), the specimens were allocated into two groups, polished and stained. The specimens of each group were stored (for 7 days) in either citric acid (0.2N) or distilled water. Data for surface gloss (ΔE*SCE-SCI) and roughness (Ra) were evaluated before (baseline) and after simulated toothbrushing. For toothbrushing simulation, a toothpaste slurry containing a toothpaste of 100 relative dentin abrasion (RDA) and 0.3 mL distilled water was used for 3650 cycles (7300 strokes) for each specimen. Data were analyzed using t-test and ANOVA. A p-value of ≤ to 0.05 was considered significant. The highest mean value of surface gloss was identified in CU (stained—water) (4.3 (0.47)) (ΔE*) and EN (stained—acid) (4.3 (1.00)) (ΔE*) specimens, whereas the lowest mean value was shown by SH (stained—acid) (2.04 (0.42)) (ΔE*) samples. The highest mean value of surface roughness was observed in SH (0.40 (0.99)) Ra (stained—acid) whereas the lowest in VM (0.13 (0.039)) Ra (polished—water). A significant difference (p < 0.05) was observed in surface roughness and gloss between the materials with simulated toothbrushing, except in VM and LU, respectively. Therefore, it can be concluded that simulated toothbrushing impacts on surface roughness and gloss, irrespective of the storage medium.

scholarly journals In Vitro Antifungal Evaluation of Seven Different Disinfectants on Acrylic Resins

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
A. Z. Yildirim-Bicer ◽  
I. Peker ◽  
G. Akca ◽  
I. Celik
Keyword(s):  
Surface Roughness ◽  
Candida Albicans ◽  
Uv Light ◽  
Acrylic Resin ◽  
Cost Effective ◽  
Alternative Methods ◽  
Acrylic Resins ◽  
Significant Difference ◽  
White Vinegar

Objective. The aim of this study was to evaluate alternative methods for the disinfection of denture-based materials.Material and Methods. Two different denture-based materials were included in the study. Before microbial test, the surface roughness of the acrylic resins was evaluated. Then, the specimens were divided into 8 experimental groups(n=10), according to microorganism considered and disinfection methods used. The specimens were contaminated in vitro by standardized suspensions ofCandida albicansATCC#90028 andCandida albicansoral isolate. The following test agents were tested: sodium hypochlorite (NaOCl 1%), microwave (MW) energy, ultraviolet (UV) light, mouthwash containing propolis (MCP), Corega Tabs, 50% and 100% white vinegar. After the disinfection procedure, the number of remaining microbial cells was evaluated in CFU/mL. Kruskal-Wallis, ANOVA, and Dunn’s test were used for multiple comparisons. Mann WhitneyUtest was used to compare the surface roughness.Results. Statistically significant difference(P<0.05)was found between autopolymerised and heat-cured acrylic resins. The autopolymerised acrylic resin surfaces were rougher than surfaces of heat-cured acrylic resin. The most effective disinfection method was 100% white vinegar for tested microorganisms and both acrylic resins.Conclusion. This study showed that white vinegar 100% was the most effective method for tested microorganisms. This agent is cost-effective and easy to access and thus may be appropriate for household use.

scholarly journals Changes in Crystal Phase, Morphology, and Flexural Strength of As-Sintered Translucent Monolithic Zirconia Ceramic Modified by Femtosecond Laser

2021 ◽  
Vol 11 (15) ◽  
pp. 6925
Author(s):  
Shanshan Liang ◽  
Hongqiang Ye ◽  
Fusong Yuan
Keyword(s):  
Surface Roughness ◽  
Flexural Strength ◽  
Femtosecond Laser ◽  
Laser Treatment ◽  
Acid Corrosion ◽  
Zirconia Ceramic ◽  
Control Group ◽  
Airborne Particle ◽  
Monolithic Zirconia

Conventional bonding technology suitable for silica-based ceramics is not applicable to zirconia, due to its polycrystalline phase composition, chemical stability, and acid corrosion resistance. The development of an effective treatment to improve its surface roughness and mechanical properties remains an unresolved problem. Therefore, to solve this problem, this in vitro study evaluated the changes in surface morphology and flexural strength of translucent monolithic zirconia surfaces treated with femtosecond laser technology. As-sintered translucent zirconia specimens were subjected to airborne particle abrasion and femtosecond laser treatments, while control group specimens received no treatment. After treatment, the roughness and morphology of the treated zirconia surfaces were examined. The flexural strength and X-ray diffraction of the treated specimens were measured and analyzed. Statistical inferential analysis included one-way analysis of variance at a set significance level of 5%. The surface roughness after femtosecond laser treatment was significantly improved when compared with the control group and the group that received the airborne particle abrasion treatment (p < 0.05). In comparison with the airborne particle abrasion group, the flexural strength of the group that received the femtosecond laser treatment was significantly improved (p < 0.05). The femtosecond laser approach using appropriate parameters enhanced the roughness of the zirconia without reducing its flexural strength; therefore, this approach offers potential for the treatment of zirconia surfaces.

scholarly journals Noni – An Effective Solution for Denture Storage

2021 ◽  
Vol 10 (16) ◽  
pp. 1150-1155
Author(s):  
Surabhi Duggal ◽  
Karthikeyan Vaishnavi ◽  
Mohanalakshmi D. ◽  
Megha Chopra
Keyword(s):  
Thermal Conductivity ◽  
Flexural Strength ◽  
Plant Extract ◽  
Test Group ◽  
Acrylic Resin ◽  
Morinda Citrifolia ◽  
Control Group ◽  
Distilled Water ◽  
Microbial Infections ◽  
Group 2

BACKGROUND A plant extract of Morinda citrifolia has been known as an analgesic to treat and heal patients with various health problems ranging from body aches to microbial infections. Every component of this medicinal plant can be made use of to cure diabetes and many other systemic disorders. The role of Morinda citrifolia in dentistry is mostly limited to endodontics, whereas not much evidence is seen in the area of prosthetic dentistry. Hence, the present study has been conducted to study the effects of this magical plant extract on storage and disinfection of acrylic dentures. METHODS Samples of ten rectangular heat-cured polymethylmethacrylate resin moulds were fabricated by the traditional technique of denture processing. Five specimens were dipped in distilled water (Group 1) and the other five specimens were immersed in Morinda citrifolia (Group 2) for 20 days after which they were subjected to UTM testing to evaluate flexural strength. Results were analysed using Mann Whitney Utest (P < 0.05). RESULTS Statistical analysis proves that polymethylmethacrylate slices immersed in the test group (Morinda citrifolia / group 2) showed superior thermal conductivity than the control group (P = 0.028). CONCLUSIONS The flexural strength of Polymethylmethacrylate had increased after storing in Morinda citrifolia for twenty days when compared to storage in distilled water. Thus, Morinda citrifolia can be used as an effective storage medium without any changes in the flexural strength. KEY WORDS Plant Extract in Dentistry, Thermal Conductivity, Heat Cure Acrylic Resin, Geriatric Patients

Evaluation of Polypropylene Fiber Reinforced Glass Ionomer Cement: A Comparative In-Vitro Study

2020 ◽  
Vol 11 (2) ◽  
pp. 196-201
Author(s):  
Fatih Oznurhan ◽  
Ceren Ozturk
Keyword(s):  
Surface Roughness ◽  
Flexural Strength ◽  
In Vitro Study ◽  
Vitro Study ◽  
Control Group ◽  
Glass Ionomer ◽  
Fiber Reinforced ◽  
Group 4 ◽  
Group 3

Aim: To compare the surface roughness, microtensile bond strength (µTBS), and flexural strength of polypropylene (PP) fibers reinforced glass ionomer cements (GICs). Materials and Methods: A comparative in vitro study was designed to test the PP fiber reinforced GIC, which was formed when 0.5–1 mm length PP fibers were added into the powder of conventional GIC. Four groups were prepared (Group 1: control, Group 2: 1 wt% PP fiber, Group 3: 3 wt% PP fiber, and Group 4: 5 wt% PP fiber) to evaluate flexural strength, surface roughness values, and µTBS. A total of 10 samples with 25 × 2.5 × 5 mm dimensions were prepared for each group to test flexural strength. Disk-shaped specimens ( n = 10) of 2 mm thickness and 10 mm diameter were used to test surface roughness. A total of 24 human primary molar teeth were used to evaluate µTBS, and 12 sticks were obtained for each group. The fractured surface analyses of samples from µTBS was performed using scanning electron microscope. The data obtained from the experiments were recorded and analyzed with one-way analyses of variance technique, and the normality was tested using the Shapiro–Wilk technique. A significance level of .05 was used. Results: In flexural strength tests, Group 3 (3 wt% PP fiber) showed significantly increased values ( p < .05) when compared with other groups. Group 4 (5 wt% PP) showed significantly highest values in surface roughness tests ( p < .05). No significant differences were seen between the groups ( p > .05) according to µTBS results. More PP fibers were seen in fractured surfaces, when PP ratio increases. Conclusion: It was observed that increased PP fiber percentage showed increased surface roughness, and 3 wt% PP fiber gave optimal values for fracture toughness. Incorporation of PP fiber to GIC does not affect the bonding to primary tooth dentine.

Sign in / Sign up

Export Citation Format

Share Document