Although color changes were not statistically significantly different between the two materials, they behaved differently. J Mech Biomed Mater. 2013;29(11):1091-7. The Ra parameter on the profile for polyamide material in the control group was found at around 497.46 nm, while that in the microwave group was found at around 953.89 nm. The site is secure. 20 - Lamb DJ, Ellis B, Priestley D. The effects of process variables on levels of residual monomer in autopolymerizing dental acrylic resin. Linear dimensional changes of denture base and hard chair-side reline resins after disinfection. The microwave energy ranges between 450-650 W for a period of 2 to 10 minutes. This model of color changes was also followed by the materials in the control baths. 11 - Duyck J, Vandamme K, Muller P, Teughels W. Overnight storage of removable dentures in alkaline peroxide-based tablets affects biofilm mass and composition. On the contrary, Basso, et al.44 - Basso MF, Giampaolo ET, Vergani CE, Machado AL, Pavarina AC, Ribeiro RC. (2015) at 30 microwave disinfection cycles (0.67 for PMMA and 1.11 * units for polyamide). Egypt Dent J. This material generally replaces the metal and the methyl methacrylate denture base material used conventionally to build the framework for standard removable partial dentures. HHS Vulnerability Disclosure, Help The new PMC design is here! Regression analysis was also performed to estimate the trend of changes with time.

[3,4] Once the casting was completed, the flask was allowed to bench cool .The sprues were removed and dentures polished. The Reinforcement of Dentures. E* parameter increased with the cycles up to 2.0-2.5 units at the end of the experiment, with the microwaved groups presenting the highest values. J Am Dent Assoc.

(2014) observed expansion in rectangular PMMA specimens after 7 or 28 cycles of microwave disinfection at 600 W or 700 W for 3 minutes. J Prosthet Dent. Out of 18 cases, which ranged from 37 to 82 yrs, eight were female and ten were male in the study. Anthony DH, Peyton FA. Measurements were taken: 1) immediately after specimens polishing (0dry); 2) after their immersion in distilled water for 48 hours (0wet); 3) after 3, 7, 14, 28, 56, 84, 112, 140, 168, 196, and 224 cycles in a microwave oven, or after 9, 21, 42, 84, 168, 252, 336, 420, 504, 588 and 672 minutes in distilled water for the control group. Effect of microwave disinfection on mechanical properties of denture base acrylic resin. The effect of repeated microwave disinfection on the dimensional stability of acrylic dentures. The effect of repeated microwave irradiation on the dimensional stability of a specific acrylic denture resin. Egypt Dent J. 2013;30(1):26-31. each, simulating the effect of daily cleansing for almost 7.5 months. J Mater Sci. In this study, TP values of Vertex were initially higher than those of Valplast (Figure 7). Effect of microwave disinfection on mechanical properties of denture base acrylic resin. 2016 Sep 6. doi: 10.1111/jopr.12539.,2525 - Polyzois GL, Zissis AJ Yannikakis SA. A noncontact optical interferometric profilometer (Wyko NT1100, Veeco, Santa Barbara, CA, USA) was used to take 3-D surface images of the specimens at the end of immersion time, for qualitative analysis. Effect of cleansing methods on 3-D surface roughness, gloss and color of a polyamide denture base material. There was no fracture observed in new flexible dentures. These changes are probably due to the loss of staining materials either by a direct effect of microwaves on the polyamide material or a greater diffusion of water molecules in the PMMAs polymer matrix, some of which may additionally bind permanently to high energy sites of the polymer. 31 - Wagner DA, Pipko DJ. Linear dimensional changes of denture base and hard chair-side reline resins after disinfection. 2010;23(5):410-7. Careers. Measurements were performed at a right angle with the surface of the specimen, at three different sites in the middle area of the specimen for obtaining a mean value. The innovation of the nylon-derived denture base material in the 1950s paved the way for a new type of dentures. Intraoral determination of the tolerance of dentists for perceptibility and acceptability of shade mismatch. Looking at the graph of Figure 3, it is seen that the change for the Vertex was initially close to that of Valplast, but in two weeks reached the level of its total change and remained there until the end of 224 cycles (7.5 months). Wax carving was done and intraoral trial was taken for each patient to evaluate esthetics, phonetics, and functional occlusion. Open Dent J. Dent Mater. The flask was placed in the press for 3 minutes and then bench-cooled before opening. 1992;20(6):370-4. 2013;41(12):1281-9.,1313 - Freitas-Pontes KM, Gomes CE, Carvalho BM, Sabia RS, Garcia BA. J Prosthodont. 2013;41(12):1281-9. FOIA 2015;24(1):25-31.. Ra values for PMMA were at 47.9 nm and 79.83 nm respectively. 2013;30(1):26-31.. Microwave irradiation of dentures is performed by either the wet (placed in a water bath) or dry disinfection method. The effects of repeated microwave energy on physico-mechanical properties of denture base materials have been investigated in many studies22 - Alkhodary MA. Acta Stomatol Croat. Some problems with these prostheses are difficult to address, such as insertion in undercut areas, brittleness of methyl methacrylate which leads to fracture, and allergy to methyl methacrylate monomer.[2]. 2007;97(4):200-8. Halitosis reported in two cases in the present study was attributable to the personal dietary and oral hygiene habits of these patients. Infection control recommendations for the dental office and the dental laboratory. J Prosthodont. All these patients were ready to participate in the study and all the questions were answered by them after thorough observations on a scale of 1 to 4 as compared to the same observations with their old PMMA dentures. Effect of cleansing methods on 3-D surface roughness, gloss and color of a polyamide denture base material. (2015) have already shown. In this study, the extend of shrinkage did not exceed -1.12%, which is in perfect agreement with a previous study of Polychronakis, Yannikakis and Zissis2424 - Polychronakis N, Yannikakis S, Zissis A. J Am Dent Assoc. Similarly, Table Table1c,1c, ,dd and Table 2 show that whereas the problem of insertion and removal and fracture had been taken care of, the comfort was higher with new flexible dentures and in all parameters, the P value was less than 0.001 and was of great importance statistically. Microwave disinfection: cumulative effect of different power levers on physical properties of denture base resins. Differences between PMMA and polyamide material were noted only in dimension and translucency changes. The secondary parameters (L*, a*, b*) were also estimated, and color differences were based on equation [1]. Comparison of Changes in Vertical Dimension between Compression and Injection Molded Complete Dentures. (2014) who found that PMMA showed linear shrinkage up to -1.16% following disinfection of seven 6 minutes cycles in a microwave oven at 650W. Gerodontology.

The fact that water starts boiling after 90 seconds of irradiation2222 - Neppelenbroek KH, Pavarina AC, Spolidorio DM, Vergani CE, Mima EG, Machado AL.

Linear dimensional changes of denture base and hard chair-side reline resins after disinfection. However, both denture base materials under microwaving disinfection cycles exhibited a small shrinkage at first which later became greater for the Vertex (PMMA) and decreased slightly for the Valplast (polyamide). Microwave disinfection: cumulative effect of different power levers on physical properties of denture base resins. 2013;29(11):1091-7. Int J Prosthodont. Valplast was the polyamide material used and Vertex Rapid Simplified was the PMMAs one. J Prosthodont. 30 - Seplveda-Navarro WF, Arana-Correa BE, Borges CP, Jorge JH, Urban VM, Campanha NH. The problems with their existing dentures included irritating mucosa, foul smell, difficulty to wear and remove, frequent fractures / cracks, etc. In the present study, all the 18 cases were prolonged denture wearers who had undergone frequent adjustments such as relining and rebasing of their old dentures, which were not functionally comfortable. They were provided flexible dentures along with a questionnaire to precisely evaluate the advantages of new material. The gap created after the boiling and removal of the patterns was filled with suitable material for the fabrication of specimens. Adding denture cleanser to microwave disinfection regimen to reduce the irradiation time and the exposure of dentures to high temperatures. Initial color of both materials presented a similar change at about 2.0-2.5 * units, which resulted from a significant loss in L* for the PMMA and in a* and b* for the polyamide material. Special flasks were used for flasking, dewaxing, and injecting molten Velplast or Flexite denture material as per directions of manufacturer. Furthermore, bleaching of dental base materials, unpleasant taste to patients and oral tissue reactions are some of the adverse effects of chemical disinfectants1515 - Hamouda IM, Ahmed SA.

2013;30(1):26-31.. The effect of two microwave energies on the linear dimensional changes of two heat cured acrylic resin thicknesses. Effect of cleansing methods on 3-D surface roughness, gloss and color of a polyamide denture base material. - Duyck J, Vandamme K, Muller P, Teughels W. Overnight storage of removable dentures in alkaline peroxide-based tablets affects biofilm mass and composition. Long-term microwaving of denture base materials: effects on dimensional, color and translucency stability.

The figure shows that TP values for the Vertex material are initially higher than those of Valplast and remained the same for both materials of the control groups at all cycle intervals. Acta Stomatol Croat. 1999;81(4):375-9. Sample size was decided in a priori estimation using G*Power software v.3.1.9.2 (Universitt Kiel, Kiel, Germany), and an effect size (f) of 0.60, almost half the value found in a previous study2323 - Polychronakis NC, Polyzois GL, Lagouvardos PE, Papadopoulos TD. Acta Odontol Scand. This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Although clinician's skills and experience play a major role in designing and fabrication of the optimum prosthodontic restorations, the selection of denture resins is equally important, especially when the patient has been using the prostheses since long. Int J Prosthodont. Once the maxillomandibular relations were recorded, the teeth were arranged as per directions of the manufacturer. 2015;24(1):25-31. P value was < 0.001 and was statistically significant. Most of the changes were negative, indicating a decrease when the number of cycles was increased. 2011;20(8):632-8. 5 - Coimbra FC, Salles MM, Oliveira VC, Macedo AP, Silva CH, Pagnano VO, et al. Influence of microwave disinfection on the dimensional stability of denture reline polymers.J Prosthodont. 1996;127(5):672-80. 1983;11(1):80-8. From each material, sixteen specimens were constructed, which were divided into two groups (n=8). The effects of microwave disinfection on the dimensional stability of denture base materials have been extensively studied, and some of them showed significant dimensional changes22 - Alkhodary MA. 24 - Polychronakis N, Yannikakis S, Zissis A. Under the limitations of the present in vitro study, the following conclusions can be drawn: Long-term microwaving increased the initial shrinkage of polyamide material slightly and decreased that of PMMA significantly. J Prosthet Dent. Another explanation for the difference between their and our results may be related to the type of materials and the polymerization cycle used for specimens fabrication, as well as to the methods applied for measuring dimensional changes. Intraoral fit of the prostheses was checked for occlusal balancing, any overextension, etc., so that the functional relation of the prosthesis with intraoral structures could be established.

The results indicated that long-term repeated microwaving affects linear dimensional, color and translucency changes of both materials. 25 - Polyzois GL, Zissis AJ Yannikakis SA. - American Dental Association Council on Scientific Affairs and Council on Dental Practice. Color stability of resins and nylon as denture material in beverages. It also has a high creep resistance and fatigue endurance along with the excellent wear characteristics and solvent resistance. Al-Rafidain Dent J. 2013;30(1):26-31. Data collected from measurements of the specimens length, color coordinates and translucency parameter (TP) values during repeated cycles in water with or without microwave irradiation were analysed statistically, using the 2-way repeated measures ANOVA in order to estimate possible statistically significant differences among predetermined cycles. The effect of repeated microwave disinfection on the dimensional stability of acrylic dentures. The values of the Ra variables were estimated by scanning one surface per specimen. Statistical evaluations performed at a significance level of 5%. J Prosthodont. Thirty two specimens (32 mm x 10 mm x 2.5 mm) from polyamide (Valplast) and PMMA (Vertex Rapid Simplified) denture base materials were made. 2016;29(3):149-53. Most probably, the decrease can be explained by the increase in roughness due to microwave irradiation on PMMA and polyamide material (Figure 8), as Polychronakis, et al.2323 - Polychronakis NC, Polyzois GL, Lagouvardos PE, Papadopoulos TD. Acta Stomatol Croat. Evidence for non-thermal microwave effect in the sintering of partially stabilized zirconia. 9 - Douglas RD, Steinhauer TJ, Wee AG. - Al- Sumaidae RR. Photosensitization of in vitro biofilms formed on denture base resins. The Use of Nylon as Denture Base Material. The material matches with the tissue and tooth color to a reasonably well extent. 2011;20(8):606-12. J Appl Polym Sci. The effect of repeated microwave irradiation on the dimensional stability of a specific acrylic denture resin. Any correction required was done at this stage. 2010;3(7):480-7. 2006;102(2):1821-6.,2424 - Polychronakis N, Yannikakis S, Zissis A. The effect of repeated microwave disinfection on the dimensional stability of acrylic dentures. 2006;102(2):1821-6. Denture disinfection by microwave irradiation: a randomized clinical study. Prosthodontic planning & observations regarding this material are discussed on various parameters. Linear dimensional changes of denture base and hard chair-side reline resins after disinfection. The effect of repeated microwave disinfection on the dimensional stability of acrylic dentures. 2014;60(4):3737-42.,2727 - Senna PM, Silva WJ. Acta Stomatol Croat. Bethesda, MD 20894, Web Policies The effect of two microwave energies on the linear dimensional changes of two heat cured acrylic resin thicknesses. 2 - Alkhodary MA. However, temperature developing during microwave disinfection may have a negative impact on polymer structure. Influence of microwave disinfection on the dimensional stability of denture reline polymers.J Prosthodont. Valplast reached the level of 1.5 * at 7 cycles (one week) and remained there until the end of the experiment, while Vertex reached the same level after 14 days and, continuing to increase, it finally reached a higher level of change than Valplasts. J Prosthet Dent. Same observation was 0 (zero) in almost all cases except one with new flexible dentures. 2011;20(8):606-12.,3131 - Wagner DA, Pipko DJ. L* in Vertex, a* in Valplast and b* in both materials were decreased by the microwave action, as trend lines and R2 values indicate in these figures. Restorative dental materials.10th ed.

- Hersek N, Canay S, Uzun G, Yildiz F. Color stability of denture base acrylic resins in three food colorants. 2010;19(5):364-8.,66 - Consani RL, Iwasaki RY, Mesquita MF, Mendes WB, Consani S. Effect of repeated simulated disinfections by microwave energy on complete denture base adaptation. Loss of teeth, which may be due to trauma, dental diseases, pathology, or otherwise not only alters the psychological thought of the patients but also disturbs the esthetics, phonetics, and functional occlusion. It has no porosity, no biological material build-up, and stains. Both resins tested in this study exhibited a statistically significant change of their initial color after microwave disinfection and reached the level of almost 2.5 units of * at the end of 224 cycles. Al-Rafidain Dent J. 1996;127(5):672-80. Clinical study of a heat-cured silicone soft lining material. - Wagner DA, Pipko DJ. Translucent denture base materials allow light to pass through them and reflect back the normal soft tissues shades, thus making the devices look more natural. Calculations of TP for the groups at the specified cycle intervals, their difference from the translucency at the baseline are given in Figure 7 with their trend lines, and R2 following a logarithmic regression (Table 2). - Seo RS, Vergani CE, Pavarina AC, Compagnoni MA, Machado AL. 2013;29(11):1091-7.. Control groups showed only a slight expansion within water baths (less than 0.05 mm), probably due to water sorption by the hydrophilic acrylic resin, as a result of the polarity of its molecules22 - Alkhodary MA. 2006;102(2):1821-6. Initial finishing was performed with 600 grit, 800 grit and 1200 grit waterproof silicon carbide paper in an Ecomet III polishing equipment (Buehler Ltd, Evaston, III, USA) while polishing was performed using a high gloss agent (KMG, Candulor AG, Zurich, Switzerland) on a white cotton yam wheel polishing brush (Bur Dental, Guangzhoo, China). Phillips Science Of Dental Materials; p. 238. This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

1996;31(8):2019-26.. This new-generation nylon-based thermoplastic material has a predictable long-term performance. Linear dimensional changes of denture base and hard chair-side reline resins after disinfection. Experimental design limitations of this work, such as testing of dimensional changes on rectangular specimens instead of actual dentures, make it difficult to compare the results of this in vitro study with those obtained under clinical circunstances. 2008;2:61-6.,1414 - Gonalves AR, Machado AL, Giampaolo ET, Pavarina AC, Vergani CE. The use of such solutions has also been considered to be time-consuming1515 - Hamouda IM, Ahmed SA. Table 1a shows that with old dentures seven patients observed mucosal irritation at grade 4 which was highest and seven patients observed it at grade 3. 6 - Consani RL, Iwasaki RY, Mesquita MF, Mendes WB, Consani S. Effect of repeated simulated disinfections by microwave energy on complete denture base adaptation. It is important that both color and translucency of denture base materials be maintained throughout their clinical use1717 - Hersek N, Canay S, Uzun G, Yildiz F. Color stability of denture base acrylic resins in three food colorants. J Dent. - Polychronakis NC, Polyzois GL, Lagouvardos PE, Papadopoulos TD. Egypt Dent J. J Prosthet Dent. 2015;24(1):25-31., while others reported dimensional stability44 - Basso MF, Giampaolo ET, Vergani CE, Machado AL, Pavarina AC, Ribeiro RC. - Gonalves AR, Machado AL, Giampaolo ET, Pavarina AC, Vergani CE. Effectiveness of microwave sterilization on three hard chairside reline resins. Following opening, the specimen was removed from the stone mold and the sprue was removed. Adding denture cleanser to microwave disinfection regimen to reduce the irradiation time and the exposure of dentures to high temperatures. However, there are no studies focusing on the translucency of denture base materials and how much it is affected by their color changes. Before Adding denture cleanser to microwave disinfection regimen to reduce the irradiation time and the exposure of dentures to high temperatures. The cycles were repeated until the number of cycles for the measurement was reached, and with a new water bath of 232C for every new cycle. The change for Valplast was increasing with cycles, but the change was evident after 112 cycles (4 months) and continued to increase until the end of the experiment. 2007;97(4):200-8. The material is light in weight, heat resistant, and ductile and is injected at a temperature of 274 to 300C. Translucency of the specimens was estimated by calculating the TP (Translucency Parameter) using the equation [2], where B and W refer to color tristimulus values against a black (B) and white (W) background, respectively. Nishigawa G, Matsunaga T, Maruo Y, Okamoto M, Natsuaki N, Minagi S. Finite Element Analysis of the Effect of the Bucco-Lingual Position of Artificial Posterior Teeth under Occlusal Force on the Denture Supporting Bone of the Edentulous Patients. Material type, composition and manufacturer are shown in Figure 1. Influence of microwave disinfection on the dimensional stability of denture reline polymers.J Prosthodont. Microwave disinfection: cumulative effect of different power levers on physical properties of denture base resins. 7 - Craig RG. This effect of water on PMMA material was also reported by Hong, et al.1818 - Hong G, Murata H, Li Y, Sadamori S, Hamada T. Influence of denture cleansers on the color stability of three types of denture base acrylic resin. Acta Odontol Scand. Only two cases (11%) reported halitosis, four cases (22.2%) reported debonding of teeth from the dentures after 10 and 11 months, respectively. Stay informed of issues for this journal through your RSS reader, Text 2006;102(2):1821-6. 2009;37(9):666-72. TP values decreased for both materials when irradiated, and reached a decrease of 18.5%-22.5% after 224 cycles. St Louis: Mosby; 1997. Statistical analysis (2-way repeated measures ANOVA) indicated a significant difference between material groups (p<0.001, power=1), and among cycle groups (p<0.001, power=1), with material-cycle interaction (p<0.001, power=1). J Dent. Photosensitization of. 14 - Gonalves AR, Machado AL, Giampaolo ET, Pavarina AC, Vergani CE.

Effect of cleansing methods on 3-D surface roughness, gloss and color of a polyamide denture base material. J Mech Biomed Mater. Al-Rafidain Dent J. 1979;6(2):199-204. J Mater Sci. Linear dimensional changes of denture base and hard chair-side reline resins after disinfection. Data obtained from changes in length of denture base materials at all predetermined number of cycles are presented in Table 1. Flexible dentures are an excellent alternative to conventionally used methyl methacrylate dentures, which not only provide excellent aesthetics and comfort but also adapt to the constant movement and flexibility in partially edentulous patients. J Dent. J Am Dent Assoc. - Kurt A, Erkose-Genc G, Uzun M, Sar T, Isik-Ozkol G. The effect of cleaning solutions on a denture base material: elimination of. However, de-bonding of the teeth was observed in four cases after 10 and 11 months of use and was attributed to faulty de-waxing procedure, where wax was not completely removed from the mechanical undercuts (Diatorics) and the molten flexible denture base material could not flow into the areas created for mechanical locking.[9]. The present study was conducted at three dental centers, where patients selected were those who were not happy with their existing complete / complete [Figure 1], complete / partial [Figure 2], partial / partial dentures [Figures [Figures33 and and4],4], made of conventionally used poly methyl- methacrylate denture base material and were in search of some substitute. (2011), although in their studies the irradiation protocol was different (650 W for 6 minutes or 900 W for 3 minutes per cycle). All measurements were carried out by the same investigator. Munns D. Nylon as a Denture Base Material. 8600 Rockville Pike J Appl Polym Sci. 2008;2:61-6. Acta Stomatol Croat. Anusavice KJ. 4 - Basso MF, Giampaolo ET, Vergani CE, Machado AL, Pavarina AC, Ribeiro RC. When questioned about the preference among the two types of denture base material, 100% patients preferred the flexible dentures over the customary methyl methacrylate dentures. J Appl Polym Sci. 2013;30(1):26-31. J Prosthet Dent. Polychronakis, et al.2323 - Polychronakis NC, Polyzois GL, Lagouvardos PE, Papadopoulos TD. Rests of the cases were highly satisfied with the use of flexible dentures. 2015;73(5):353-63. Adding denture cleanser to microwave disinfection regimen to reduce the irradiation time and the exposure of dentures to high temperatures. This studys results showed that microwave disinfection cycles did not significantly alter the color of both denture materials in relation to the control group, while significant differences were found between materials in dimensional and translucency. 2014;48(4):279-84. 2015;73(5):353-63. the effect caused by the release of existing internal stresses within the materials, caused by the direct or indirect action of irradiation. Specimens of both groups were immersed in distilled water and hanged in a small wooden rod fixed over the beaker using a nylon fishing line. The above indicates a two times higher value for microwaved materials and ten times higher for the polyamide. All the cases were evaluated for the following parameters [Tables [Tables11 and and2]:2]: mucosal irritation, halitosis, ease of insertion and removal and fractures / cracks frequency and comfort in function. 1995;8(2):150-4. J Oral Rehabil. 2014;60(4):3737-42.. The small initial shrinkage of both materials probably is the result of annealing, i.e. J Prosthet Dent. J Prosthodont. 2014;112(3):632-7.,1515 - Hamouda IM, Ahmed SA. 1996;127(5):672-80.,55 - Coimbra FC, Salles MM, Oliveira VC, Macedo AP, Silva CH, Pagnano VO, et al. Microwaves; Color; Translucency; Dimension; Denture bases. Dent Mater. 28 - Senna PM, Sotto-Mattior BS, Silva WJ, Del Bel Curry AA. Effect of microwave disinfection on mechanical properties of denture base acrylic resin. The change of the irradiated Valplast group was due to the decrease in a* and b* parameters, while that of irradiated Vertex was due to the decrease in L* and b*. Linear dimensional changes of denture base and hard chair-side reline resins after disinfection.

J Prosthodont. PMMA specimens were fabricated according to the manufacturers instructions using a conventional pressurepack technique and a 20 minutes water bath procedure at 100C. The results were analysed using two-way repeated measures ANOVA to estimate possible differences among predetermined cycles and material type. 2014;112(3):632-7. J Mech Biomed Mater. The effect of two microwave energies on the linear dimensional changes of two heat cured acrylic resin thicknesses. The J Prosthodont. 2011;20(8):606-12. 3 - American Dental Association Council on Scientific Affairs and Council on Dental Practice. 2011;20(8):606-12.-2828 - Senna PM, Sotto-Mattior BS, Silva WJ, Del Bel Curry AA. School of Dentistry - National and Kapodistrian University of Athens. 2014;48(4):279-84. J Dent. Egypt Dent J. J Mech Biomed Mater. J Prosthodont. The effect of repeated microwave irradiation on the dimensional stability of a specific acrylic denture resin. J Mater Sci.

The instrument was initially calibrated following manufacturers instructions, and then once every 20 measurements. The flexible dentures were found to fare significantly better as compared to the conventional methyl methacrylate dentures on the parameters taken in the present study.

13 - Freitas-Pontes KM, Gomes CE, Carvalho BM, Sabia RS, Garcia BA. The purpose of this study was to evaluate the effect of a long-term repeated microwaving on the dimensional, color and translucency stability of acrylic and polyamide denture base materials.

Acta Odontol Scand. Palate shape, denture base thickness and teeth presence are some of the factors that lead to the final effect. and transmitted securely. - Polychronakis N, Yannikakis S, Zissis A. When extrapolating (forecasting) these effects to one year (at 364 cycles), only the Vertex-M reaches the level of 2.7 units due to its over than -2.0 units change in lightness. Restorative dental materials.10th ed. 2009;37(9):666-72. Int J Prosthodont. Trend analysis also indicated a logarithmic regression line of change with the number of cycles (Table 2) with a greater R2 for Vertex Control, Vertex Microwaved and Valplast Control. J Appl Polym Sci. 15 - Hamouda IM, Ahmed SA. - Consani RL, Iwasaki RY, Mesquita MF, Mendes WB, Consani S. Effect of repeated simulated disinfections by microwave energy on complete denture base adaptation. J Appl Polym Sci. (Figure 3). - Alkhodary MA. Each measurement was repeated 3 times and the mean value was calculated and recorded. J Dent. J Prosthodont. Velplast and Flexite were the two nylon denture base materials used (as the materials were available) in the study.

J Prosthodont. 1983;11(1):80-8. J Prosthet Dent. Also, the postinsertion maintenance is easy, which makes it a very user- friendly denture base material.[7,8]. J Dent.

- Dorner S, Zeman F, Koller M, Lang R, Handel G, Behr M. Clinical performance of complete dentures: a retrospective study. J Oral Rehabil. - Lamb DJ, Ellis B, Priestley D. The effects of process variables on levels of residual monomer in autopolymerizing dental acrylic resin.