scholarly journals Evaluation of the marginal accuracy of provisional restorations made of acrylic resins

2019 ◽  
Vol 18 ◽  
pp. e191404
Author(s):  
Ísis Franco Pereira ◽  
Emilena Maria Castor Xisto Lima
Keyword(s):  
Analysis Of Variance ◽  
The Other ◽  
Marginal Adaptation ◽  
Finish Line ◽  
Acceptable Limit ◽  
Tukey Test ◽  
Acrylic Resins ◽  
Direct Technique ◽  
Marginal Discrepancy

Aim: To evaluate the marginal accuracy of provisional crowns made with acrylics resins and to identify the surface(s) with the highest marginal discrepancy. Methods: A direct technique was used to fabricate 96 provisional restorations with 8 materials: Dencrilay, Dencôrlay, Dencôr, Vipicor, Duralay, Resinlay Speed, Refine Bright and Alike (n=12). The provisional crowns were made on a prepared molar-shaped metal die with a vinyl polysiloxane impression as a matrix. Marginal discrepancy of provisional restorations was analyzed at buccal, lingual, mesial and distal surfaces of metal die finish line in a stereomicroscope lupe at 100X. The images obtained were transferred to the Corel Draw X7 program and the distances from the cervical margins of the specimen to the reference lines were measured vertically. Comparisons were made with 1-way analysis of variance and the Tukey test (p <0.05). Results: The Alike resin exhibited the lowest marginal discrepancy (0.018 mm) and was significantly different from the Dencôrlay (0.037 mm), Filter Bright (0.034 mm), Duralay (0.033 mm) and Vipicor (0.032) resins. The buccal surface showed the highest marginal discrepancy (0.040 mm) compared to those of other surfaces (distal 0.029mm, lingual 0.028mm and mesial 0.024mm). Conclusion: The marginal adaptation of all materials and surfaces tested in this study were within a clinical acceptable limit. The Alike resin showed the best performance compared to Dencôrlay, Refine Bright, Duralay, and Vipicor resins. The buccal surface showed the highest marginal discrepancy than those of the other tested surfaces.

scholarly journals Marginal adaptation of provisional crowns made of acrylic and bisacrylic resins using different impression materials

2019 ◽  
Vol 18 ◽  
pp. e191603
Author(s):  
Camilla Lopes Cerqueira ◽  
Roniel Kappler ◽  
Andrea Araújo Nobrega Cavalcanti ◽  
Emilena Maria Castor Xisto Lima
Keyword(s):  
Marginal Adaptation ◽  
Tukey Test ◽  
Prosthetic Materials ◽  
Acrylic Resins ◽  
Impression Materials ◽  
Direct Technique ◽  
Significant Difference ◽  
Irreversible Hydrocolloid ◽  
Marginal Discrepancy ◽  
Materials Used

Aim: To evaluate the marginal adaptation of provisional crowns made of acrylic and bisacrylic resins using different impression materials. Methods: a metal die and a matrix applied through a direct technique were used to fabricate the specimens. The impression materials used as a matrix were divided into four groups: Irreversible hydrocolloid
(IH), laboratory silicone (LS), condensation silicone (CS), and addition silicone (AS). After the impression procedures, each matrix was loaded with the provisional prosthetic materials, Alike, Duralay, Protemp 4, and Structur 3 (n = 12). Marginal discrepancy was evaluated using a stereomicroscope at ×45 magnification. The images obtained were transferred to the Corel Draw X7 program, and the distances from the cervical margins of the specimen to the reference lines at the metal die were measured vertically. The data were analyzed by using 2-way ANOVA followed by the Tukey test (α=.05). Results: the acrylic resins had higher values ​​of marginal discrepancy compared to the bisacrylic resins. A statistically significant difference was found between all impression materials, and the irreversible hydrocolloid presented higher values of discrepancy (303.28–613.31 μm), whereas addition silicone had the lowest (48.61–190.06 μm). Conclusions: the bisacrylic resins had a better marginal adaptation compared to the acrylic resins. The addition silicone promoted a better marginal adaptation of the provisional prosthetic materials tested, followed by condensation silicone, laboratory silicone, and irreversible hydrocolloid.

scholarly journals Evaluación de Extractos Vegetales y Bioinsecticidas Sobre Poblaciones de Spodoptera frugiperda y Elasmopalpus lignosellus en Maíz

2017 ◽  
Vol 13 (21) ◽  
pp. 238
Author(s):  
Teddy Landívar Ortiz ◽  
Eduardo Colina Navarrete ◽  
Carlos Castro Arteaga ◽  
Danilo Santana Aragoné ◽  
Guillermo García Vásquez ◽  
...  
Keyword(s):  
Experimental Design ◽  
Economic Analysis ◽  
Analysis Of Variance ◽  
Spodoptera Frugiperda ◽  
The Other ◽  
Hybrid Corn ◽  
Tukey Test ◽  
Elasmopalpus Lignosellus ◽  
Organic Insecticides ◽  
Higher Doses

The research was carried out on the Property “El Cartan” that is located in Km 4 way at Puebloviejo-Ventanas, county of Los Ríos. A test was conducted on the hybrid corn DK-1040. This test measures the response of the larvae of insects Spodoptera frugiperda and Elasmopalpus lignosellus to the application of dose of biological and organic insecticides. Also, the most appropriate dose in products was determined with an economic analysis. The experimental design used was random complete blocks with seven treatments and three replicates. The variables evaluated are: percentage of larvae control, number of larvae per plant, corn damage, and yield for hectare. The evaluated variables were subjected to the analysis of variance, and Tukey test was applied to 95 % probability. The analyzed results were determined to apply Neem (Azadirachtina indica) in dose of 1,0 L ha -1 . It diminishes the populations of S. frugiperda and E. lignosellus in relationship to the other active matters applied in the test. Higher doses lead to migration of pests to nearby hosts. The highest yield per hectare was found in the Neem 1.0 L ha-1 treatment with 8,940 kg ha-1.

scholarly journals Maxillary incisor retraction: evaluation of different mechanisms

2013 ◽  
Vol 18 (2) ◽  
pp. 101-107 ◽  
Author(s):  
Antônio Carlos de Oliveira Ruellas ◽  
Matheus Melo Pithon ◽  
Rogério Lacerda dos Santos
Keyword(s):  
Stainless Steel ◽  
Heat Source ◽  
Analysis Of Variance ◽  
Steel Wire ◽  
The Other ◽  
Maxillary Incisor ◽  
Tukey Test ◽  
Group A ◽  
Incisor Retraction ◽  
Incisor Inclination

OBJECTIVE: To mechanically evaluate different systems used for incisors retraction. METHODS: Three different methods for incisors retraction using 0.019 x 0.025-in stainless steel wire were evaluated. The samples were divided into three groups: Group A (retraction arch with 7-mm high vertical hooks); Group G3 (elastic chain attached to the miniimplant and to the 3-mm stainless steel hook soldered to the retraction arch); Group G6 (elastic chain attached to the mini-implant and to the 6-mm stainless steel hook soldered to the retraction arch). A dental mannequin was used for evaluation in order to simulate the desired movements when the device was exposed to a heat source. The analysis of variance (ANOVA) and the Tukey test were used (p < 0.05). RESULTS: The results demonstrated that Groups G3 and G6 exhibited less extrusion and less incisor inclination during the retraction phase (p < 0.05). With regard to incisor extrusion, statistically significant differences were observed between Groups A and G3, and between Groups A and G6 (p < 0.05). Regarding incisor inclination, statistically significant differences were observed between the three systems evaluated (p < 0.05). CONCLUSIONS: Arches with 6-mm vertical hooks allow the force to be applied on the center of resistance of the incisors, thus improving mechanical control when compared with the other two systems.

Comparison of Marginal Adaptation of Different Resin-Ceramic CAD/CAM Crowns: An In Vitro Study

2020 ◽  
pp. 232020682097597
Author(s):  
Ece Irem Oguz ◽  
Mehmet Ali Kılıçarslan ◽  
Merve Erdog˘ Özgür ◽  
Kaan Orhan ◽  
Sohaib Shujaat
Keyword(s):  
Analysis Of Variance ◽  
Computer Aided Design ◽  
Three Dimensional ◽  
In Vitro Study ◽  
Vitro Study ◽  
Marginal Adaptation ◽  
Computer Aided ◽  
Cad Cam ◽  
Marginal Discrepancy

Aim: To compare the marginal adaptation of crowns fabricated by using three different resin-ceramic computer-aided design/computer-aided manufacturing (CAD/CAM) materials. Materials and Methods: Crowns fabricated from three different resin-ceramic CAD/CAM blocks, applied on a typodont premolar (#14), were tested with regard to marginal adaptation, in this in vitro study. The typodont maxillary first premolar was prepared to serve as the master die and digitized with an intraoral scanner. The same virtual crown design was used to fabricate all specimens. Forty-eight crowns were fabricated from the same virtual crown design using three different CAD/CAM resin-ceramic blocks as follows ( n = 16): Lava Ultimate (LU), GC Cerasmart (GC), Vita Enamic (VE). Master die and crowns were scanned with a laboratory scanner and three-dimensional data were transferred into three-matic software. The software calculated the mean of the marginal discrepancy (MD) for each crown in negative and positive values, representing under and over estimation of the crown margin, respectively. A marginal discrepancy index (MDI) was obtained for each group using negative and positive MDs. All data were statistically analyzed using one-way analysis of variance and Tukey’s honest significance test ( α = 0.05). Results: The analysis of variance showed no statistical differences between materials regarding the negative and positive MDs ( P > .05). The MDI for LU was lower than GC and VE ( P < .05). Conclusion: The marginal adaptation of different resin-ceramic materials was different with regard to MDI values. Nevertheless, the MD values of all groups were within the clinically acceptable range.

scholarly journals ANÁLISE FÍSICO-QUÍMICA E CONTAGEM DE COLIFORMES TOTAIS E TERMOTOLERANTES DE ALMÔNDEGAS ELABORADAS COM CARNE DE CAPIVARA E DIFERENTES CONCENTRAÇÕES DE BACON

2017 ◽  
Vol 13 (Especial 2) ◽  
pp. 35-40
Author(s):  
Gabriella Castro Cunha ◽  
Brena Cristine Rosário Silva ◽  
Diego da Silva Pedro ◽  
Vilson Matias Pinto ◽  
Márcio Ramatiz Lima dos Santos ◽  
...  
Keyword(s):  
Experimental Design ◽  
Analysis Of Variance ◽  
Titratable Acidity ◽  
The Other ◽  
Tukey Test ◽  
Physical Chemical ◽  
Level Of Significance

The objective of this study was to evaluate the quality of meatballs prepared with capybara meat and different concentrations of pork bacon. Three formulations of capybara meatballs were prepared: one with 100% of capybara meat and the other with 10 and 20% of pork bacon added. Coliforms were carried out at 35 and 45ºC of the meatball samples, in addition to pH, titratable acidity, moisture and ash determinations. In relation to the physical-chemical determinations, the results were submitted to analysis of variance and the differences of the means compared by Tukey test at the 5% level of significance. The results of the microbiological analyzes were evaluated in a descriptive way. The experimental design was completely randomized. All physicalchemical and microbiological determinations were performed in triplicate. Coliform analyzes showed that the meatballs were fit for consumption and the physicochemical results are in acceptable levels.

Impression Techniques for Multiple Implants: A Photoelastic Analysis. Part II: Comparison of Four Acrylic Resins

2013 ◽  
Vol 39 (5) ◽  
pp. 545-549 ◽  
Author(s):  
Itamar Lopes-Júnior ◽  
Barbara de Lima Lucas ◽  
Henner Alberto Gomide ◽  
Vanderlei Luiz Gomes
Keyword(s):  
Analysis Of Variance ◽  
Acrylic Resin ◽  
Tukey Test ◽  
Acrylic Resins ◽  
Photoelastic Analysis

Four commercial brands of chemically activated acrylic resin were compared through photoelastic analysis. Photoelastic resin blocks were made with 2 implants placed parallel to each other and 2 square transfer copings splinted. Both transfers were splinted with chemically activated acrylic resin: Dencrilay, Duralay I, Duralay II, and GC. Data were analyzed by 2-way analysis of variance and Tukey test (P &lt; .05). Statistically significant differences were found among the 3 brands of chemically activated acrylic resin. Dencrilay showed greater dimensional alteration. Duralay I and GC are recommended for the transfer of the position of the multi-implants.

scholarly journals Fluoride release by restorative materials before and after a topical application of fluoride gel

2003 ◽  
Vol 17 (2) ◽  
pp. 137-141 ◽  
Author(s):  
Denise Pedrini ◽  
Alberto Carlos Botazzo Delbem ◽  
Juliana Gomes Macedo de França ◽  
Thiago de Medeiros Machado
Keyword(s):  
Analysis Of Variance ◽  
Topical Application ◽  
Fluoride Concentration ◽  
Deionized Water ◽  
The Other ◽  
Fluoride Release ◽  
Tukey Test ◽  
Restorative Materials ◽  
Before And After ◽  
Comparison Of The Results

The release of fluoride from restorative materials (Vitremer, Ketac-Fil, Fuji II LC and Freedom) was evaluated during two 15-day periods, before and after a topical application of acidulated phosphate fluoride gel (APF). For each material, 6 specimens were made, which were immersed in 2 ml of deionized water. The fluoride concentration dosages in the solutions were read at intervals of 24 hours for 15 days. After this period, the specimens of each material received treatment with APF gel for 4 minutes and the fluoride released was analyzed at 24-hour intervals during the following 15 days. The analysis of variance and the Tukey test (p < 0.05) showed that the total mean fluoride released during the initial 15 days was greater for Vitremer and Ketac-Fil and lower for Fuji II LC and Freedom; and in the final 15 days there was a difference in release readings, with the greatest value for Vitremer, followed by Fuji II LC, Ketac-Fil and Freedom. The comparison of the results between the 1st day and the 16th day (after gel application) showed a greater fluoride release on the 16th day for Vitremer, Fuji II LC and Freedom and was equal for Ketac-Fil. Although all the materials evaluated gained fluoride with the application of APF, the data suggest that the resin-modified ionomers are more efficient in releasing fluoride to the medium than the other materials.

scholarly journals Influence of chemical and mechanical polishing on water sorption and solubility of denture base acrylic resins

2004 ◽  
Vol 15 (3) ◽  
pp. 225-230 ◽  
Author(s):  
Juliana Saab Rahal ◽  
Marcelo Ferraz Mesquita ◽  
Guilherme Elias Pessanha Henriques ◽  
Mauro Antonio Arruda Nóbilo
Keyword(s):  
Analysis Of Variance ◽  
Water Sorption ◽  
Mechanical Polishing ◽  
Hot Water ◽  
Distilled Water ◽  
Denture Base ◽  
Tukey Test ◽  
Acrylic Resins ◽  
Lower Solubility ◽  
Desiccation Process

Influence of polishing methods on water sorption and solubility of denture base acrylic resins was studied. Eighty samples were divided into groups: Clássico (CL), and QC 20 (QC) - hot water bath cured; Acron MC (AC), and Onda Cryl (ON) - microwave cured; and submitted to mechanical polishing (MP) - pumice slurry, chalk powder, soft brush and felt cone in a bench vise; or chemical polishing (CP) - heated monomer fluid in a chemical polisher. The first desiccation process was followed by storage in distilled water at 37 ± 1ºC for 1 h, 1 day, 1, 2, 3 and 4 weeks. Concluding each period, water sorption was measured. After the fourth week, a second desiccation process was done to calculate solubility. Data were submitted to analysis of variance, followed by Tukey test (p<0.05). Means of water sorption (%) and solubility (%), respectively, were: CL-MP: 1.92 and 0.02; CL-CP: 1.98 and 0.52; QC-MP: 2.31 and -0.05; QC-CP: 2.32 and 0.25; AC-MP: 2.45 and -0.07; AC-CP: 2.43 and 0.41; ON-MP: 2.32 and -0.06; ON-CP: 2.34 and 0.27. Mechanical polishing promoted significantly lower solubility of acrylic resins; initially, water sorption values were higher for chemically polished samples, however, after 4 weeks all groups were similar.

scholarly journals QUALIDADE MICROBIOLÓGICA E FÍSICO-QUÍMICA DE ALMÔNDEGAS ELABORADAS COM CARNE DE CAPIVARA E DIFERENTES CONCENTRAÇÕES DE BACON

2017 ◽  
Vol 13 (Especial 2) ◽  
pp. 426-431
Author(s):  
Gabriella Castro Cunha ◽  
Vilson Matias Pinto ◽  
Brena Cristine Rosário Silva ◽  
Diego da Silva Pedro ◽  
Márcio Ramatiz Lima dos Santos ◽  
...  
Keyword(s):  
Experimental Design ◽  
Analysis Of Variance ◽  
Titratable Acidity ◽  
The Other ◽  
Tukey Test ◽  
Physical Chemical ◽  
Level Of Significance

The objective of this study was to evaluate the quality of meatballs prepared with capybara meat and different concentrations of pork bacon. Three formulations of capybara meatballs were prepared: one with 100% of capybara meat and the other with 10 and 20% of pork bacon added. Coliforms were carried out at 35 and 45ºC of the meatball samples, in addition to pH, titratable acidity, moisture and ash determinations. In relation to the physical-chemical determinations, the results were submitted to analysis of variance and the differences of the means compared by Tukey test at the 5% level of significance. The results of the microbiological analyzes were evaluated in a descriptive way. The experimental design was completely randomized. All physicalchemical and microbiological determinations were performed in triplicate. Coliform analyzes showed that the meatballs were fit for consumption and the physicochemical results are in acceptable levels.

Performance of two combine harvester header in soybean crops

2020 ◽  
Vol 13 (2) ◽  
pp. 1
Author(s):  
E. M. Samogim ◽  
T. C. Oliveira ◽  
Z. N. Figueiredo ◽  
J. M. B. Vanini
Keyword(s):  
Experimental Design ◽  
Crop Yield ◽  
Field Performance ◽  
Travel Speed ◽  
The Other ◽  
Combine Data ◽  
Mato Grosso ◽  
Tukey Test ◽  
Combine Harvester ◽  
And Performance

The combine harvest for soybean crops market are currently available two types of combine with header or platform, one of conventional with revolving reel with metal or plastic teeth to cause the cut crop to fall into the auger header and the other called "draper" headers that use a fabric or rubber apron instead of a cross auger, there are few test about performance of this combine header for soybean in Mato Grosso State. The aim of this work was to evaluate the soybean harvesting quantitative losses and performance using two types combine header in four travel speed. The experiment was conducted during soybean crops season 2014/15, the farm Tamboril in the municipality of Pontes e Lacerda, State of Mato Grosso. The was used the experimental design of randomized blocks, evaluating four forward harvesting speeds (4 km h-1, 5 km h-1, 6 km h-1 and 7 km h-1), the natural crops losses were analyzed, loss caused by the combine harvester (combine header, internal mechanisms and total losses) and was also estimated the  field performance of each combine. Data were submitted to analysis of variance by F test and compared of the average by Tukey test at 5% probability. The results show the draper header presents a smaller amount of total loss and in most crop yield when compared with the conventional cross auger.

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