Physical Properties of Vanillin Incorporated Self-Curing Orthodontic Polymethylmethacrylate Resin

2020 ◽  
Vol 853 ◽  
pp. 46-50
Author(s):  
Thongchai Poonpiriya ◽  
Pornrachanee Sawaengkit ◽  
Sroisiri Thaweboon ◽  
Pornkiat Churnjitapirom
Keyword(s):  
Flexural Strength ◽  
Physical Properties ◽  
Flexural Modulus ◽  
Orthodontic Appliances ◽  
Surface Porosity ◽  
Significance Level ◽  
Removable Orthodontic Appliances ◽  
Pmma Resin ◽  
One Way Anova

Polymethylmethacrylate (PMMA) resin is the main polymeric material used in removable orthodontic appliances. However, it can promote the adhesion of microbes due to its surface porosity and from long-term use. While vanillin incorporated PMMA resin has been reported to have antimicrobial effects against Candida albicans, the influence of vanillin incorporation on the physical properties of self-curing orthodontic PMMA resin has not been studied. Objective: To determine the flexural strength and flexural modulus of self-curing orthodontic PMMA resin incorporated with vanillin in different concentrations. Materials and methods: Three groups of self-curing orthodontic PMMA with incorporated vanillin concentrations of 0.1%, 0.5% as well as PMMA without vanillin as a control were prepared with ten specimens per group. Flexural strength and flexural modulus were tested by a 3-point bending machine according to ISO 20795-2:2013 specifications. One-way ANOVA and Tukey’s multiple comparison tests at a p<0.05 significance level were used to analyse the data. Results: The 0.1% vanillin incorporated group met ISO standard requirements (flexural strength = 60.48 MPa, flexural modulus = 1756.60 MPa), while the 0.5% vanillin incorporated group failed to pass this standard (flexural strength = 46.94 MPa, flexural modulus = 1423.49 MPa). The means of both flexural strength and flexural modulus showed significant differences among the three groups. Increasing the concentration of vanillin would decrease the flexural strength and flexural modulus of PMMA resin. Conclusion: The incorporation of vanillin into self-curing orthodontic PMMA resin can affect its physical properties, namely flexural strength and flexural modulus. At a concentration of 0.1% vanillin incorporation, PMMA resin displayed physical properties within the ISO standards.

Water Sorption and Solubility of Vanillin-Incorporated Self-Curing Orthodontic Polymethylmethacrylate Resin

2021 ◽  
Vol 1020 ◽  
pp. 187-191
Author(s):  
Thongchai Poonpiriya ◽  
Pornrachanee Sawaengkit ◽  
Pornkiat Churnjitapirom ◽  
Sroisiri Thaweboon
Keyword(s):  
Water Sorption ◽  
Water Solubility ◽  
Sorption Property ◽  
Control Group ◽  
Orthodontic Appliances ◽  
Significance Level ◽  
Group Water ◽  
Removable Orthodontic Appliances ◽  
Pmma Resin

Polymethylmethacrylate (PMMA) resin is one of the most commonly used materials for fabricating the base of removable orthodontic appliances. It is known that PMMA resin can promote the adhesion of microbes due to its surface porosity and from long-term use. Vanillin-incorporated PMMA resin has been reported to have antimicrobial effects against Candida albicans. However, the influence of vanillin incorporation on the water sorption and solubility of self-curing orthodontic PMMA resin has not been studied. Objective: To determine the water sorption and solubility of self-curing orthodontic PMMA resin incorporated with different concentrations of vanillin. Materials and methods: Three groups of self-curing orthodontic PMMA resin incorporated with 0.1% and 0.5% vanillin as well as PMMA without vanillin as a control were prepared with ten specimens per group. Water sorption and solubility tests were performed according to ISO 20795-2:2013 specifications. One-way ANOVA and Tukey’s multiple comparison tests at a p<0.05 significance level were used to analyse the data. Results: All three groups met ISO standard requirements. The means of water sorption values showed insignificant differences among the three groups even though the value of the 0.5% vanillin group tended to decrease. Water solubility of the 0.1% vanillin-incorporated group was not significantly different when compared with the control group whereas that of the 0.5% vanillin-incorporated group exhibited a significant lower value when compared with both control and 0.1% vanillin-incorporated groups. This suggests that increasing concentrations of vanillin would decrease the water solubility of PMMA resin. Conclusion: The incorporation of 0.5% vanillin into self-curing orthodontic PMMA resin could significantly reduce its water solubility and showed a trend of less water sorption property. Even with different vanillin concentrations, the water sorption and water solubility properties of PMMA resin were within the ISO standards. Nevertheless, further studies are recommended to determine the amount of residual monomer present in different concentrations of vanillin-incorporated PMMA resin.

The Physical Properties of PMMA Denture base Resin Incorporated with Vanillin

2018 ◽  
Vol 773 ◽  
pp. 338-343 ◽  
Author(s):  
Kittituch Vongvachvasin ◽  
Sroisiri Thaweboon ◽  
Pornkiat Churnjitapirom ◽  
Saowaros Kaophun ◽  
Natdhanai Chotprasert
Keyword(s):  
Flexural Strength ◽  
Physical Properties ◽  
Vickers Hardness ◽  
Flexural Modulus ◽  
Surface Hardness ◽  
Hardness Test ◽  
Antimicrobial Effect ◽  
Denture Base ◽  
Significance Level ◽  
Significant Difference

Long-term use of a denture base can be a reservoir of microbes due to porosities and mechanical wear of denture surfaces. Vanillin has an antimicrobial effect. However, its influence on physical properties after incorporated in PMMA has not yet been evaluated. The purpose of this study was to investigate physical properties of PMMA by incorporating vanillin in different concentrations. Material and method. There were three groups of PMMA with ten specimens per group. Flexural strength and flexural modulus were tested by using a 3-point bending machine, and surface hardness was determined by Vickers hardness test. One-way ANOVA and Kruskal Wallis tests were used to analyze all data at 0.05 significance level. Result. The 0.1% vanillin group yielded a significant difference in Vickers hardness number (17.15 HV) as compared to 0.5% vanillin group (16.30 HV) and without vanillin (15.30 HV). In contrast, the flexural strength and modulus showed no significant difference among test groups upon incorporation of vanillin. Conclusion. The vanillin incorporated PMMA group demonstrated higher surface hardness, compared to the group without vanillin. In addition, there were no significant differences in flexural strength and flexural modulus among the three groups. This study also found no adverse effect in physical properties of the vanillin incorporated PMMA.

Effect of Orthodontic Appliances on Oral Microbiota—6 Month Follow-up

2011 ◽  
Vol 35 (4) ◽  
pp. 433-436 ◽  
Author(s):  
Asli Topaloglu-Ak ◽  
Fahinur Ertugrul ◽  
Ece Eden ◽  
Mustafa Ates ◽  
Hakan Bulut
Keyword(s):  
Orthodontic Appliances ◽  
Oral Microbiota ◽  
Chi Square ◽  
Carious Lesions ◽  
Colony Forming Units ◽  
Negative Effect ◽  
Unstimulated Saliva ◽  
Removable Orthodontic Appliances ◽  
Short Time

Objective: This study investigates the effect of fixed and removable orthodontic appliances among children on salivary Streptococcus mutans, Lactobacillus sp. and Candida albicans. Study Design: The study was conducted on 69 patients aged between 6-17 years who used fixed or removable orthodontic appliances. Five ml samples of unstimulated saliva from each patient were collected at baseline and at the 1, 3 and 6 month periodic controls. Samples were diluted and plated on Mitis Salivarus Agar (MSA), Man Rogosa Sharp Agar (MRS) and Saboroud Dextrose Agar (SDA). The growths on the plates were examined under a stereomicroscope. Numbers of colony forming units (CFU) per plate were counted. For statistical analysis,the paired t test and Chi-Square were used. Results: S mutans and Lactobacillus sp counts increased significantly 6 months after the insertion of fixed/removable orthodontic appliances in the oral cavity. A significant increase for C albicans presence was noted after 3 months compared with baseline for fixed appliances.Conclusion: Long-term utilization of orthodontic appliances may have a negative effect on microbial flora and increase the risk of new carious lesions and periodontal problems. Patients should be recalled within short time intervals to be motivated for oral hygiene during their orthodontic therapy.

scholarly journals Longitudinal stability of rapid and slow maxillary expansion

2014 ◽  
Vol 19 (6) ◽  
pp. 70-77 ◽  
Author(s):  
Fábio Henrique de Sá Leitão Pinheiro ◽  
Daniela Gamba Garib ◽  
Guilherme Janson ◽  
Roberto Bombonatti ◽  
Marcos Roberto de Freitas
Keyword(s):  
Retrospective Study ◽  
Orthodontic Appliances ◽  
Maxillary Expansion ◽  
Longitudinal Stability ◽  
Posterior Crossbite ◽  
Group A ◽  
Group B ◽  
One Way Anova ◽  
Intercanine Distance

OBJECTIVE: The aim of this retrospective study was to compare the longitudinal stability of two types of posterior crossbite correction: rapid maxillary expansion (RME) and slow maxillary expansion (SME).METHODS: Study casts of 90 adolescent patients were assessed for interdental width changes at three different periods: pretreatment (T1), post-treatment (T2) and at least, five years post-retention (T3). Three groups of 30 patients were established according to the treatment received to correct posterior crossbite: Group A (RME), group B (SME) and group C (control- Edgewise therapy only). After crossbite correction, all patients received fixed edgewise orthodontic appliances. Paired t-tests and one-way ANOVA were used to identify significant intra and intergroup changes, respectively (P < 0.05).RESULTS: Except for intercanine distance, all widths increased in groups A and B from T1 to T2. In the long-term, the amount of relapse was not different for groups A and B, except for 3-3 widths which showed greater decrease in group A. However, the percentage of clinically relapsed cases of posterior crossbite was similar for rapid and slow maxillary expansion.CONCLUSION: Rapid and slow maxillary expansion showed similar stability in the long-term.

Microwave Irradiation of Candidal Adhesion and Biofilm on Polymethylmethacrylate Resin

2014 ◽  
Vol 905 ◽  
pp. 73-77
Author(s):  
Reiyal Goveas ◽  
Theerathavaj Srithavaj ◽  
Amornrat Wonglamsam ◽  
Boonyanit Thaweboon ◽  
Sroisiri Thaweboon
Keyword(s):  
Flexural Strength ◽  
Microwave Irradiation ◽  
Biofilm Formation ◽  
Strength Reduction ◽  
Maximum Effect ◽  
Phase Study ◽  
Significant Difference ◽  
Candidal Species ◽  
Pmma Resin ◽  
One Way Anova

This 3 phase study examined (1) the effect of microwave irradiation on the adhesion and (2) biofilm formation of 4 candidal species on heat polymerized polymethyl methacrylate (PMMA) specimens. Lastly, (3) the flexural strength of heat polymerized PMMA was tested.C.albicans(ATCC 10231),C. glabrata(ATCC 22019),C. krusei(ATCC 6258) andC.parapsilosis(ATCC 90030) were used. The flexural strength of the PMMA resin after microwave irradiation was tested in accordance with ISO 20795-1 specifications. A one-way ANOVA statistical analysis was used for all the results.The maximum effect of 94% to 98% reduction in adhesion and biofilm counts was seen with microwave irradiation at 850 W and 1000 W for 120 sec. There was no significant difference between the control and irradiated specimens in terms of flexural strength. Reduction of candida adhesion and biofilm on PMMA resin can be achieved with microwave irradiation.

scholarly journals Flexural Modulus and Strength of Cold Cured Poly(methylmethacrylate) Reinforced with TiO2 Nano Particles

2021 ◽  
Vol 57 (4) ◽  
pp. 13-20
Author(s):  
Sebastian Balos ◽  
Branislava Petronijevic Sarcev ◽  
Ivan Sarcev ◽  
Petar Janjatovic ◽  
Branka Pilic ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Flexural Modulus ◽  
Antibacterial Properties ◽  
Polymer Chains ◽  
Nano Particles ◽  
Dsc Analysis ◽  
Tio2 Addition ◽  
20 Nm ◽  
Reduced Mobility ◽  
Pmma Resin

The most significant disadvantage of cold cured poly (methyl methacrylate) - PMMA is its poor mechanical properties, mainly in flexure. The aim of this work is to explore the modulus and flexural strength of modified cold cured PMMA modified with low TiO2 addition, which can also have antibacterial properties. Commercial cold cured PMMA resin, consisting of powder and liquid components, were modified by adding 0.05 %, 0.2 %, and 1.5 wt. % 20 nm hydrophobic TiO2. The specimen s flexural modulus and strength were tested, while heat properties were determined with DSC analysis. SEM and EDX were used to study fracture surfaces of tested specimens. In all modified specimens, an increased flexural modulus and flexural strength were recorded. In all specimens, the appearance of agglomerates was noted. Glass transition temperatures also increased, as the result of the appearance of polymer chains with reduced mobility around nanoparticles. 0.2 % of 20 nm TiO2 nanoparticle content proved to be the most efficient in increasing flexural modulus and strength.

Physical Properties of Four Acrylic Denture Base Resisns

2005 ◽  
Vol 6 (4) ◽  
pp. 93-100 ◽  
Author(s):  
Thomas R. Meng ◽  
Mark A. Latta
Keyword(s):  
Impact Strength ◽  
Flexural Strength ◽  
Physical Properties ◽  
Flexural Modulus ◽  
Heat Processing ◽  
Denture Base ◽  
Test Fixture ◽  
Izod Impact Strength ◽  
Izod Impact ◽  
The Impact

Abstract Resistance to impact fracture and high flexural strength are desirable properties of denture base acrylics. The purpose of this laboratory study was to determine the Izod impact strength, the flexural strength, the flexural modulus, and the yield distance for four premium denture resins. Bar specimens 86 x 11 x 3 mm of Lucitone 199, Fricke Hi-I, ProBase Hot, and Sledgehammer Maxipack were fabricated following the manufacturer's instructions for heat processing. The bars were surface finished using silicon carbide paper to 600 grit. Ten specimens from three lots of each material were made (n=30). Flexural strength, flexural modulus, and yield distance were determined by testing the specimens to failure using a three-point test fixture. Izod impact strength was determined using an Izod tester on un-notched specimens generated from the flexural test (n=60). Analysis of variance (ANOVA) and post-hoc Tukey's test were used for statistical comparison of each property. There were significant differences in the physical properties among the denture acrylics tested. Lucitone 199 demonstrated the highest impact strength, flexural strength, and yield distance (p<0.05). Lucitone 199 with an Izod impact strength of 5.5 ± 1.2 N·m, a flexural strength of 99.5 ± 4.5 MPa, and yield distance of 9.9 ± 0.76 mm exhibited statistically greater results than Fricki Hi-I, ProBase Hot, and Sledgehammer Maxipack. Fricki Hi- I with a yield distance of 7.3 ± 1.1 mm was statically greater than ProBase Hot and Sledgehammer Maxipack. Fricki Hi-I, ProBase Hot, and Sledgehammer Maxipack were statistically similar for the Izod impact strength and flexural strength tests performed. ProBase Hot and Sledgehammer Maxipack yielded statistically similar results for all tests performed. Flexural modulus had an inverse relationship to the impact strength, flexural strength, and yield distance. Citation Meng TR, Latta MA. Physical Properties of Four Acrylic Denture Base Resins. J Contemp Dent Pract 2005 November;(6)4:093-100.

In Vitro Study of Streptococcus mutans Biofilm Formation on Vanillin-Incorporated Orthodontic PMMA Resin

2019 ◽  
Vol 801 ◽  
pp. 9-14 ◽  
Author(s):  
Sroisiri Thaweboon ◽  
Boonyanit Thaweboon
Keyword(s):  
Dental Caries ◽  
Streptococcus Mutans ◽  
Biofilm Formation ◽  
Antimicrobial Property ◽  
Cell Counting ◽  
Bacterial Suspension ◽  
Orthodontic Appliances ◽  
Increased Risk ◽  
Removable Orthodontic Appliances ◽  
Pmma Resin

Removable orthodontic appliances made of poly methyl methacrylate (PMMA) resin are commonly used after complete orthodontic treatment to keep teeth in the right position and prevent the shift out from the alignment. The use of these appliances can place patients at increased risk of dental caries through the biofilm accumulation ofStreptococcus mutans, caries-associated bacteria, on the surfaces of appliance themselves. Moreover, their rough surfaces or intrinsic porosities of PMMA enhance a condition for plaque aggregation, altering the oral microflora and limiting the washing out action of saliva on teeth and mucosal tissues, subsequently bringing about enamel demineralization and gingival inflammation. Cleaning by brushing or using chemical disinfectants is necessary for hygiene maintenance of the appliances, but requires patient cooperation, which is uncertain. Vanillin is a natural phenolic aldehyde which is used widely as a flavoring agent in various foods. It has been reported by many studies to exhibit antimicrobial activity. The aim of the present study was to evaluate antimicrobial property of vanillin-incorporated orthodontic PMMA resin onS. mutansbiofilm formation. The self-curing orthodontic PMMA resin samples (SCG Chemicals, Thailand) were prepared according to the percentage of vanillin incorporation (0%, 0.1% and 0.5% vanillin). Another group of commercial resin samples without vanillin (Dentsply Caulk, USA) was prepared in the same manner. All samples were coated with sterile unstimulated saliva collected from three healthy adult volunteers at 37 °C for 60 min. TheS. mutansbiofilm formation was done with the 107colony forming unit (CFU)/m of bacterial suspension in 96-well plate and incubated at 37°C in 5% CO2 atmosphere for 24 h. The amount of biofilm was quantified by Cell Counting Kit WST-8 (Dojindo Molecular Technologies, USA) at 450 nm. All tests were performed in triplicate on three separate occasions. One-way ANOVA and Turkey’s test were used for the statistical analysis. A significant inhibitory effect was observed in 0.5% vanillin incorporated samples at 48 h compared with 0% vanillin and commercial samples. The percentage of biofilm reduction was 30%. In conclusion, the incorporation of vanillin to self-curing orthodontic PMMA resin could significantly inhibit biofilm formation ofS. mutans. Using this PMMA resin, removable orthodontic appliances with antimicrobial property can be applied to prevent dental caries or tooth demineralization in orthodontic patients.

scholarly journals PRESERVED ALLOPLASTIC MATERIAL IN TREATMENT OF TUMORS AND ODONTOGENIC CYSTS IN CHILDREN

2021 ◽  
pp. 29-33
Author(s):  
P.A. Zhelezny ◽  
◽  
S.P. Zhelezny ◽  
Yu.K. Zheleznaya ◽  
A.P. Zheleznaya ◽  
...  
Keyword(s):  
Odontogenic Cysts ◽  
Orthodontic Appliances ◽  
Facial Aesthetics ◽  
Clinical Observations ◽  
Aesthetic Results ◽  
Near Term ◽  
Removable Orthodontic Appliances ◽  
Jaw Defects

Long-term clinical observations on the treatment and rehabilitation of 117 children with tumors and tumor-like formations of the maxillofacial region are presented. To replace jaw defects, we used transplants preserved in various ways: frozen — in 48 patients, preserved in 0,5% formalin — in 7 patients, Kostma — in 7 pati¬ents, Deprotex — in 28 patients, Orgamax — in 27 patients. In the postoperative period, orthopedic and orthodontic rehabilitation of patients was carried out using removable and non-removable orthodontic appliances and dental implant systems. In the near term, no complications were revealed in 108 patients; consolidation of the graft with the bone bed occurred. 9 patients developed a purulent inflammatory process with allograft sequestration. The follow-ups of the patients showed that after transplantation, the allograft was gradually resorbed and replaced with a full-fledged organotypic regenerate within a period of 1,0 to 3 years. During the long-term up to 10 years follow-up, 92 patients (89,3 %) obtained good anatomical, functional and aesthetic results of rehabilitation, characterized by full restoration of the function of the dentition and facial aesthetics. In 11 patients (10,7 %), the results were satisfactory.

scholarly journals Antimicrobial activity and physicochemical performance of a modified endodontic sealer

2020 ◽  
Vol 9 (11) ◽  
pp. e069119401
Author(s):  
Flávia Gonçalves ◽  
Luiza Mello de Paiva Campos ◽  
Luciana Katty Figueiredo Sanches ◽  
Larissa Tavares Sampaio Silva ◽  
Tamiris Martins Ribeiro dos Santos ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Antimicrobial Activity ◽  
Drug Release ◽  
Flexural Strength ◽  
Physicochemical Properties ◽  
Flexural Modulus ◽  
Control Group ◽  
Ah Plus ◽  
Drug Incorporation ◽  
One Way Anova

Introduction: this study aimed to evaluate the antimicrobial and physicochemical properties of a commercial endodontic sealer modified by the addition of montmorillonite (MMT) nanoparticles loaded with two different drugs: chlorhexidine (CHX) or metronidazole (MET). Methods: 5 wt% MMT/CHX or MMT/MET nanoparticles were added to the sealer AH-Plus. The experimental materials were evaluated for drug release, antimicrobial activity, flow, flexural strength, and flexural modulus. Data were subjected to one-way ANOVA, Kruskal-Wallis, and Mann-Whitney tests. Results: The drug incorporation into MMT particles was 9% and 10% for CHX and MET, respectively. At 20 days after manipulation, 16.5% of the drug was released by the sealer with MMT/MET and 0.4% by MMT/CHX. The addition of both nanoparticles decreased the flow of materials, but they were still in compliance with ISO 6876-2012. The conversion, flexural strength, and flexural modulus of MMT/MET (87%, 37±7 MPa, 2.3 GPa) and MMT/CHX (78%, 29±2 MPa, 2.7 GPa) were similar in both groups but lower than in the control group (100%, 54±7 MPa, 4.0±0.7 GPa). Both experimental materials were able to form an inhibition halo for E. faecalis bacteria (CHX: 4.8±1.4 and MET: 4.0±1.6 mm), whereas the control group did not inhibit the microorganism. Conclusion: both formulations proposed as endodontic sealer presented effective antimicrobial activity and acceptable flow. The addition of MMT/CHX and MMT/MET particles decreased the conversion and mechanical properties, but further studies are required to clarify the clinical relevance of these properties.

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