scholarly journals Effect of plasma treatment on the bond of soft denture liner to conventional and high impact acrylic denture materials

2021 ◽  
Vol 33 (3) ◽  
pp. 9-17
Author(s):  
Lubna M Qanber ◽  
Thekra I Hamad
Keyword(s):  
Plasma Treatment ◽  
Testing Machine ◽  
Argon Plasma ◽  
Acrylic Resin ◽  
Significant Rise ◽  
High Impact ◽  
T Test ◽  
Denture Base ◽  
Soft Liner ◽  
The Impact

Background: The main drawback of soft lining materials was that they debonded from the denture base after a certain period of usage. Therefore, the purpose of this research was to determine the impact of oxygen and argon plasma treatment on the shear bonding strength of soft liners to two different kinds of denture base materials: conventional acrylic resin and high impact acrylic resin. Materials and Methods: Heat cure conventional and high impact acrylic blocks (40 for each group) were prepared. A soft liner connected the final test specimen of two blocks of each acrylic material. Shear bond strength (SBS) was assessed using universal testing machine. Additional blocks were also prepared for analyzing Vickers microhardness, contact angle, FTIR and AFM. The results were statistically analyzed using paired-sample T-test and independent-samples T-test (α=0.05). Results: The results showed a highly significant increase in SBS following plasma treatment with the highest mean value observed in plasma treated high impact acrylic specimen. Along with a significant rise in wettability, while microhardness was preserved. Conclusion: In conclusion, oxygen and argon plasma treatment was significantly effective in enhancing the SBS between soft liner and acrylic materials.

scholarly journals A Comparative Evaluation of Impact Strength of Conventionally Heat Cured and High Impact Heat Cured Polymethyl Methacrylate Denture Base Resins: An in vitro Study

2013 ◽  
Vol 14 (6) ◽  
pp. 1115-1121
Author(s):  
N Simhachalam Reddy ◽  
R Narendra ◽  
Sashi Deepth Reddy ◽  
CR Sashi Purna ◽  
M Chandra Shekar ◽  
...  
Keyword(s):  
Impact Strength ◽  
Physical Properties ◽  
Polymethyl Methacrylate ◽  
Comparative Evaluation ◽  
Acrylic Resin ◽  
High Impact ◽  
Denture Base ◽  
Entire Study ◽  
The Impact

ABSTRACT The denture bases made by using polymethyl methacrylates of Acrylic resin family have excellent physical properties, simple to process and easy to reline, rebase and repair. One of the inherent disadvantages of this material is the liability to break during function. The strength assessment of acrylic resins have been made generally by transverse deflection tests. Aim To evaluate the impact strength valves of certain brands of commercially available denture base resins and suggest their suitability. Materials and methods The denture bases we made using polymethyl methacrylates of acrylic resin family because they have excellent physical properties, simple to process and easy to reline and rebase. Six commercial brands of polymethyl methacrylate, namely Stellon (DPI-India), Acralyn-H (Asian Acrylate, India), Trevalon (Dentsply-England), Lucitone 199 (Dentsply/ York division), Acralyn-H (Super Unbreakable), Trevalon HI (Dentsply, Detray division, England) were tested by breaking them using Analog Pendulum (ASTM D 256). Results From the entire study the maximum impact strength was reported for Acralyn-H super unbreakable (Asian Acrylates, India) 62.19 joules. Conclusion All the analysis led to conclusion that there is basic change in material composition within and among the different groups of denture base resins. Clinical implications The complete dentures made using denture base resins with high impact strength valves (e.g. Acralyn-H super unbreakable) will be more durable and can be used by the patient for considerable period of time, i.e. beyond 4 to 5 years. How to cite this article Narendra R, Reddy NS, Reddy SD, Purna CRS, Shekar MC, Balasubramanyam S. A Comparative Evaluation of Impact Strength of Conventionally Heat Cured and High Impact Heat Cured Polymethyl Metharylate Denture Base Resins: An in vitro Study. J Contemp Dent Pract 2013;14(6): 1115-1121.

Effect of Curing Time on the Flexural Strength of Heat Cured Acrylic Resin

2012 ◽  
Vol 9 (2) ◽  
pp. 15-18
Author(s):  
Kazi Ziaul Islam ◽  
Md Ali Asgor Moral ◽  
Md Mahbubur Rahman
Keyword(s):  
Flexural Strength ◽  
Testing Machine ◽  
Acrylic Resin ◽  
T Test ◽  
Bending Test ◽  
Curing Time ◽  
Compression Moulding ◽  
Denture Base ◽  
Base Resin ◽  
The Mean

Objectives: The aim of this study was to find out the proper curing time and flexural strength of heat cured acrylic resin cured in boiling water at 100°c with time difference and to compare the maximum flexural strength in optimum time. Methods: In this study, 60 heat cured acrylic resin samples were processed with compression moulding technique at 100°c among which each of 20 samples were cured for 20, 40 and 60 minutes separately. Flexural strength of samples was determined by using 3 point bending test by universal testing machine. Data was analyzed using ANOVA test and unpaired t-test. Results: The ANOVA result showed that there was no significant differences among the groups with respect to the mean flexural strength (P>0.05) and unpaired t-test also showed no significant differences among the groups. The mean flexural strength of acrylic resin cured at 100°c with compression moulding technique at 100°c at 20 minutes was 80.09±14.58 MPa, at 40 minutes was 79.71±13.1 MPa and at 60 minutes was 80.76±15.75 MPa. Conclusion: The flexural strength of heat cured acrylic denture base resin cured at 100°c for different period of time (at 20, 40 & 60 minutes) have given no significant differences. DOI: http://dx.doi.org/10.3329/cdcj.v9i2.12316 City Dental College J. Volume-9, Number-2, July-2012

scholarly journals Effect of Incorporation of Silver Nanoparticles on the Tensile Bond Strength of a Long term Soft Denture Liner

2020 ◽  
Vol 14 (02) ◽  
pp. 268-273
Author(s):  
Sareh Habibzadeh ◽  
Arman Omidvaran ◽  
Solmauz Eskandarion ◽  
Ahmad Reza Shamshiri
Keyword(s):  
Silver Nanoparticles ◽  
Bond Strength ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Analysis Data ◽  
Tensile Bond Strength ◽  
Denture Base ◽  
Heat Cure ◽  
Base Resin ◽  
Soft Liner

Abstract Objectives This study aimed at assessing the effect of the addition of silver nanoparticles (SNPs) to a silicone soft liner on its tensile bond strength to denture base resin. Materials and Methods SNPs were added to Mucopren cold cure soft liner in 0 (control), 0.5, 1, 2, and 3 wt% concentrations and bonded in 120 stainless steel molds with processed heat cure acrylic resin blocks. Liner/resin combination samples were divided into two groups. The first half was stored for 2 days in distilled water at 37°C and then subjected to tensile bond strength, while the other half were thermocycled 3000 times before testing. Mean bond strength, expressed in mega pascals (MPa), was determined in the tensile test with the use of a universal testing machine at a crosshead speed of 5 mm/min. Statistical Analysis Data were analyzed using SPSS via one-way analysis of variance test, t-test, and Tukey’s posthoc, at a 95% confidence level (p < 0.05). Results Addition of SNPs and thermocycling both caused a significant reduction in the tensile bond strength of Mucopren to acrylic resin; however, in the thermocycled group, the bond strength increased with the increase in the concentration of SNPs (p < 0.001). Conclusion Addition of SNPs to Mucopren soft silicone liner reduces its tensile bond strength to denture acrylic resin.

scholarly journals Effect of plasma treatment on some surface properties of acrylic resin polymer

2020 ◽  
Vol 32 (2) ◽  
pp. 22-25
Author(s):  
Shaymaa Masood ◽  
Salah Mahamed
Keyword(s):  
Surface Roughness ◽  
Plasma Treatment ◽  
Surface Properties ◽  
Polymer Material ◽  
Oxygen Plasma ◽  
Argon Plasma ◽  
Acrylic Resin ◽  
Denture Base ◽  
Chemical Surface ◽  
Base Polymer

Background: Polymer surfaces usually present problems in bonding and finishing due to their low hydrophilicity. The aim of this study is to investigate the effect of plasma treatment with the use of two types of gases (oxygen and argon) on surface roughness, and chemical surface properties of acrylic resin denture base polymer material. Materials and Methods: Three heat cured acrylic resin specimens of (2*8*30 mm) dimensions were prepared for each test carried out in this study. Two tests were conducted, surface roughness test and chemical surface analysis test. Results: Application of plasma treatment increased surface roughness for both oxygen and argon plasma treated acrylic resin specimen groups compared with control untreated group, with a highly significant difference (P <0.01) among groups. FTIR chemical analysis for oxygen plasma treated acrylic resin specimen group showed a spectrum with a broad peak, which represents the hydroxyl group (-OH). This was an important chemical change that increased the hydrophilicity as compared with FTIR spectrums of control and argon plasma treated acrylic resin groups which exhibited relatively the same peaks with mild chemical changes. Conclusion: Application of oxygen and argon plasma treatment represents an effective surface treatment method for increasing the surface roughness of acrylic resin denture base polymer material. Oxygen plasma treatment can activate the treated surface towards further chemical reactions, and increase the hydrophilicity of the acrylic resin denture base polymer material. Key words: Acrylic resin polymer, plasma treatment, surface roughness, FTIR analysis.

scholarly journals Pengaruh minuman teh pada pemakai basis gigi tiruan nilon termoplastik terhadap penyerapan air dan stabilitas warnaThe effect of tea on the thermoplastic nylon denture base wearers on water absorption and colour stability

2020 ◽  
Vol 32 (1) ◽  
pp. 66
Author(s):  
Siti Wahyuni ◽  
Chairunnisa Ricca
Keyword(s):  
Water Absorption ◽  
Base Material ◽  
Acrylic Resin ◽  
Polyamide 6 ◽  
T Test ◽  
Laboratory Research ◽  
Colour Stability ◽  
Denture Base ◽  
Group A ◽  
Group B

Pendahuluan: Nilon termoplastik merupakan basis gigi tiruan yang banyak diminati oleh para dokter gigi karena memiliki beberapa keuntungan dibandingkan bahan basis gigi tiruan resin akrilik. Diantara jenis nilon termoplastik yang sering dijadikan basis gigi tiruan adalah poliamida 6 dan poliamida mikrokristalin. Poliamida Mikrokristalin merupakan poliamida generasi baru yang dibuat untuk menanggulangi kelemahan pada poliamida sebelumnya. Tujuan penelitian ini adalah menganalisis pengaruh minuman teh pada pengguna gigi tiruan nilon termoplastik terhadap penyerapan air dan stabilitas warna. Metode: Jenis penelitian ini adalah experimental laboratoris. Jumlah sampel terdiri dari 40 dengan  ukuran diameter 15 mm ± 1 mm dan ketebalan 0.5 mm ± 0,1 mm (ISO 4049) dan terbagi menjadi 4 kelompok (kelompok A poliamida 6 dan kelompok B poliamida mikrokristalin untuk penyerapan air serta kelompok C poliamida 6 dan kelompok D poliamida mikrokristalin untuk uji stabilitas warna). Semua sampel direndam dalam larutan teh selama 7 hari. Data dianalisis dengan uji T Independen. Gambaran mikroskopis sampel diuji dengan SEM Hasil: Berdasarkan uji T Independen hasil menunjukkan perbedaan yang signifikan diantara kelompok A dan B, C dan D.  Uji T independen menunjukkan perbedaan yang signifikan diantara kelompok A dan B, C dan D (p=0,0001, p<0,05) Simpulan: Terdapat pengaruh minuman teh pada pengguna gigi tiruan nilon termoplastik. Poliamida Mikrokristalin memiliki penyerapan air yang lebih sedikit dan stabilitas warna yang lebih baik dibandingkan Poliamida 6.Kata kunci: Nilon termoplastik, poliamida 6, poliamida mikrokristalin, penyerapan air, stabilitas warna, SEM. ABSTRACTIntroduction: Thermoplastic nylon is a denture base mostly demanded by dentists due to its several advantages over acrylic resin denture base material. Among the types of thermoplastic nylon that are often used as denture bases are polyamide 6 and microcrystalline polyamide. Microcrystalline polyamide is the new generation of polyamides created to overcome the weaknesses of previous polyamides. The purpose of this study was to analyse the effect of tea on thermoplastic nylon denture wearers on water absorption and colour stability. Methods: This research was experimental laboratory research on 40 samples with a diameter of 15 mm ± 1 mm, and a thickness of 0.5 mm ± 0.1 mm (ISO 4049), divided into four groups (Group A was the polyamide 6; Group B was the microcrystalline polyamide on the water absorption; Group C was polyamide 6; and Group D was microcrystalline polyamide on the colour stability). All samples were immersed in the tea solutions for 7 days. Data were analysed with independent t-test. The microscopic structure was analysed using the scanning electron microscope (SEM). Results: The results showed significant differences between group A, B, C, and D. The independent t-test also showed significant differences between group A, B, C, and D (p = 0.000; p < 0.05). Conclusion: There is an effect of tea on the thermoplastic nylon denture wearers. Microcrystalline polyamides have less water absorption and better colour stability than Polyamide 6.Keywords:  Polyamide 6, thermoplastic nylon, microcrystalline polyamide, water absorption, colour stability, SEM.

Effect of Argon Plasma Pretreatment on Tensile Bond Strength of a Silicone Soft Liner to Denture Base Polymers

2013 ◽  
Vol 89 (7) ◽  
pp. 594-610 ◽  
Author(s):  
Arzu Zeynep Yildirim Bicer ◽  
Arife Dogan ◽  
Selda Keskin ◽  
Orhan Murat Dogan
Keyword(s):  
Bond Strength ◽  
Argon Plasma ◽  
Tensile Bond Strength ◽  
Denture Base ◽  
Plasma Pretreatment ◽  
Soft Liner

scholarly journals Effect of Sealant Application and Thermal Cycling on Bond Strength of Tissue Conditioners to Acrylic Resin

2013 ◽  
Vol 24 (3) ◽  
pp. 247-252 ◽  
Author(s):  
Francisca Neta Cruz Soares Sampaio ◽  
Jose Renato Ribeiro Pinto ◽  
Cecilia Pedroso Turssi ◽  
Roberta Tarkany Basting
Keyword(s):  
Bond Strength ◽  
Thermal Cycling ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Tensile Bond Strength ◽  
Thermal Cycles ◽  
Bond Failure ◽  
Universal Testing ◽  
Soft Liner ◽  
Tissue Conditioner

The aim of this study was to evaluate the effect of sealer application and thermal cycling on the bond strength between tissue conditioners and acrylic resin, and to observe the type of bond failure. Two hundred eighty-eight specimens (10x16x3 mm) were made of an acrylic resin (Lucitone 500, Dentsply) using a metal muffle. Specimens were divided into four groups according to the tissue conditioner (Coe-Comfort, GC or Dentusoft, Densell) used and whether or not a sealer (Eversoft Soft Liner Sealer, Myerson) was applied. Each of the four groups was subdivided into other six subgroups (n=12) to undergo thermocycling for 45, 90, 135, 180 or 210 cycles with a dwell time of 60 s, or to be left non thermocycled (control). Tensile bond strength was measured in a universal testing machine at a crosshead speed of 5 mm/min. Sealant application had no effect on the tensile bond strength of the relined acrylic resin, regardless of the tissue conditioner used (Coe-Comfort: p=0.306 and Dentusoft: p=0.1501). The number of thermal cycles had a significant effect on the tensile bond strength of the relined acrylic resin (Coe-Comfort: p=0.002 and Dentusoft: p<0.001). Both tissue conditioners presented similar bond strength to acrylic resin. For both tissue conditioners, sealer coatings had no influence on bond strength, while different numbers of thermal cycles affected that mechanical property.

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