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 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 Implant Prostheses Fabricated by Different Materials in Excessive Crown Height Space Before and After Veneering

2021 ◽  
Author(s):  
Safoura Ghodsi ◽  
Marzieh Alikhasi ◽  
Majid Sahebi ◽  
Vahideh Nazari
Keyword(s):  
Repeated Measures ◽  
Marginal Adaptation ◽  
Crown Height ◽  
Second Molar ◽  
Basic Model ◽  
Nickel Chromium ◽  
Significant Difference ◽  
Before And After ◽  
Marginal Discrepancy ◽  
To Receive

Objectives: This study aimed to investigate the marginal adaptation of implant-supported three-unit fixed restorations fabricated in excessive crown height by various frameworks namely zirconia, nickel-chromium (Ni-Cr) alloy, and Polyetheretherketone (PEEK) before and after veneering. Materials and Methods: A basic model with two implant fixtures was made to receive posterior three-unit fixed partial dentures (second premolar to second molar) in 15 mm crown height. A total of 30 frameworks were fabricated using Ni-Cr, zirconia, and PEEK (n=10). All specimens were veneered and vertical marginal discrepancy was evaluated before and after veneering using a stereomicroscope (×75). The effect of framework material and veneering on marginal discrepancy was evaluated by repeated-measures and one-way ANOVA, and paired t test (α=0.05). Results: There was a significant difference between the groups (P<0.001) before and after veneering. The vertical marginal discrepancy of zirconia frameworks was significantly lower than that of other groups both before and after veneering (P<0.001). Statistical analysis revealed that the veneering process had a significant effect on marginal adaptation (P<0.001). Conclusion: In implant prostheses with excessive crown height, zirconia had the greatest marginal adaptaion significantly, followed by Ni-Cr. Veneering caused a significant increase in marginal discrepancy of all the materials.

scholarly journals Determinación De La Influencia De Las Fases Lunares, Utilizando Tres Variedades De Fréjol (Phaseolus Vulgaris L.) En El Cantón Antonio Ante, Provincia De Imbabura

2017 ◽  
Vol 13 (6) ◽  
pp. 190
Author(s):  
Maribel Vera Suárez ◽  
Ricardo Chávez Batancourt ◽  
Víctor Molina ◽  
Joffre León Paredes ◽  
Orlando Olvera Contreras ◽  
...  
Keyword(s):  
Phaseolus Vulgaris ◽  
Economic Analysis ◽  
Grain Yield ◽  
Phaseolus Vulgaris L ◽  
Tukey Test ◽  
Lunar Calendar ◽  
Significant Difference ◽  
Net Profit ◽  
Materials Used ◽  
Number Of Seeds

The present study was conducted at the parish of San Roque, canton Antonio which is before the county of Imbabura. The seed materials used in this study are seeds of frijol varieties such as Paragachi, Canario, and Yunguilla which comes from Santa Catalina (INIAP). The treatments were made up of fréjol varieties (Phaseolus vulgaris L) through the use of the lunar calendar. It uses the design blocks totally at random (DBCA) with six treatments and four repetitions. Their variables were subjected to the variance analysis and it was used to determine the statistical differences of multiple ranges. The Tukey test was also used in this study. The development of the experimental rehearsal were carried out by the following works based on the analysis of the floor, preparation of the floor, subscriber, sowing, fertilization, watering, control of overgrowths, control Phytosanitary, and harvest. To estimate the effects of the treatments, the following data was collected: height from the plant to 30, 60, and 90 days after planting, days of flowering; days of maturation; longitude of sheaths; number of sheaths for plant; number of seeds forsheath; weigh of 100 seeds; grain yield; and economic analysis. According to the interpretation of the results, it was deduced that the biggest plant height was obtained by planting variety of Paragachi. This is done with the use of the lunar calendar. Also, the planting of variety of Yunguilla, using the agricultural lunar calendar, reported bigger number of sheaths for plant and seeds for sheath. The variable days of flowering and days of maturation shows a highly significant difference in the studied treatments. The biggest longitude of sheaths (14,55 cm); weigh of 100 seeds (73,25 g), and yield (3325,00 kg/ha) presented canario variety using lunar calendar. With regards to the economic analysis, all the treatments obtained profitable results. The canario variety stands out using the agricultural lunar calendar with a bigger net profit of $ 3274,14.

scholarly journals Influence of two different cement space settings and three different cement types on the fit of polymer-infiltrated ceramic network material crowns manufactured using a complete digital workflow

2019 ◽  
Vol 24 (6) ◽  
pp. 1929-1938 ◽  
Author(s):  
Rinet Dauti ◽  
Bledar Lilaj ◽  
Patrick Heimel ◽  
Andreas Moritz ◽  
Andreas Schedle ◽  
...  
Keyword(s):  
Ct Scanning ◽  
Adhesive System ◽  
Digital Workflow ◽  
Mean Values ◽  
Relyx Unicem ◽  
Significant Difference ◽  
Marginal Discrepancy ◽  
Materials Used ◽  
Internal Fit ◽  
Internal Gap

Abstract Objectives The study evaluates the influence of two spacer settings and three resin luting materials on the marginal and internal fit of polymer-infiltrated ceramic network (PICN) material crowns manufactured using a complete digital workflow. Methods Optical impressions of fifty identical dies were performed using the 3M scanner (software version 5.0.2). Twenty crowns were designed using Ceramill Mind (version 3.4.10.1163), from which ten with spacer setting of 50 μm (G1) and ten with 80 μm (G2). Thirty crowns (spacer setting of 50 μm) were divided into three groups corresponding to the resin materials used as follows: RelyX Unicem (RX), Variolink Esthetic (VLE), and Nexus 3 (NX3). All crowns were milled from Vita Enamic blocks. After micro-CT scanning, absolute marginal discrepancy (AMD), internal gap (IG), total cement space volume (TCV), and marginal porosities (VP) were measured. Results Significant difference was detected on the VP between the RX and NX3 group (p = 0.033). The mean values of all parameters were the following: AMD (μm): G1 182.6, G2 253.7, RX 210.8, VLE 195.5, NX3 186.6; IG (μm): G1 215.6, G2 173.1, RX 171.1, VLE 198.6, NX3 203; TCV (mm3): G1 22.9, G2 20.49, RX 17.57, VLE 17.49, NX3 20.59; VP (mm3): G1 0.26, G2 0.34, RX 0.32, VLE 0.46, NX3 0.54. Conclusions Fit of PICN material crowns was not significantly influenced by increasing the spacer settings and cementation with different resin materials. Additionally, RelyX Unicem showed significantly less porosities as compared with Nexus3. Clinical relevance Both 50 μm and 80 μm virtual spacer settings can be suggested for the manufacture of PICN crowns when Ceramill Mind (version 3.4.10.1163) is used. Furthermore, a self-adhesive system can be recommended for the cementation.

scholarly journals A Study on Imbibition and Syneresis in Four Commercially Available Irreversible Hydrocolloid (Alginate) Impression Materials

2012 ◽  
Vol 2 (1) ◽  
pp. 1-4
Author(s):  
Sanjeev Mittal ◽  
Sanjay Bansal ◽  
Shushant Garg ◽  
Gagandeep Kansal
Keyword(s):  
Measured Quantity ◽  
Time Interval ◽  
Time Intervals ◽  
Impression Materials ◽  
Group I ◽  
Significant Difference ◽  
Irreversible Hydrocolloid ◽  
Insignificant Difference ◽  
The One ◽  
Post Hoc

ABSTRACT Purpose To evaluate imbibition and syneresis in four commercially available irreversible hydrocolloid (alginate) impression materials at different time intervals (10, 20 and 30 minutes). Materials and methods Eighty samples of four commercially available irreversible hydrocolloid (alginate) impression materials Algitex (DPI, Mumbai), Plastalgin (Septodont, Cedex, France), Zelgan 2002 (Dentsply), Finndent (Pyrex Polykem) were made. Twenty samples each of four irreversible hydrocolloid (alginate) impression materials were grouped into four groups (I, II, III and IV). Measured quantity of alginate powder and liquid was used to make samples. The samples were evaluated for imbibition and syneresis at different time intervals (i.e.10, 20, and 30 minutes) by weighing on electronic analytic balance. The data were analyzed using the one-way ANOVA, post hoc test and t-test. Results The statistical data revealed that imbibition within four groups of irreversible hydrocolloid (alginate) impression materials were not significant. Regarding syneresis there was insignificant difference between the four groups but within the group itself they showed significant difference between them depending upon the time interval. It was observed that Group I showed significant difference in syneresis at time interval of 10 to 20 minutes. Group II showed significant difference in syneresis at time interval of 10 to 30 minutes. Conclusion This study demonstrated that four groups of irreversible hydrocolloid (alginate) impression materials showed different rates of imbibition and syneresis at time interval of 10, 20 and 30 minutes depending upon molecular weight, calcium concentration and environmental conditions. How to cite this article Garg S, Mittal S, Bansal S, Kansal G. A Study on Imbibition and Syneresis in Four Commercially Available Irreversible Hydrocolloid (Alginate) Impression Materials. Int J Prosthodont Restor Dent 2012;2(1):1-4.

Dental materials

2020 ◽  
pp. 647-685
Keyword(s):  
Computer Aided Design ◽  
Dental Materials ◽  
Composite Resins ◽  
Dental Ceramics ◽  
Casting Alloys ◽  
Acrylic Resins ◽  
Impression Materials ◽  
Computer Aided ◽  
Materials Used ◽  
Aided Design

This chapter investigates the materials used in dentistry today. This includes the properties of dental materials, amalgam, and composite resins. Enamel and dentine bonding are discussed, along with dentine-adhesive systems, glass ionomers and composite-based products, and cements. Impression materials and techniques are considered, along with casting alloys, wrought alloys, dental ceramics, and computer-aided design (CAD) and computer-aided manufacture (CAM). The chapter concludes with a look at denture materials, from acrylic resins to rebasing, and the safety of dental materials.

Effect of Storage Time on the Accuracy of Casts Made from Different Irreversible Hydrocolloids

2008 ◽  
Vol 9 (4) ◽  
pp. 59-66 ◽  
Author(s):  
Maurizio Sedda ◽  
Andrea Casarotto ◽  
Aune Raustia ◽  
Andrea Borracchini
Keyword(s):  
Relative Humidity ◽  
Dimensional Stability ◽  
Storage Time ◽  
Time Dependent ◽  
Special Device ◽  
Specific Storage ◽  
Tukey Test ◽  
Impression Materials ◽  
Irreversible Hydrocolloid ◽  
Master Model

Abstract Aim Several new irreversible hydrocolloid formulations have recently become available with claims of an improved dimensional stability by the manufacturers. The aim of this study was to evaluate the accuracy of casts made from alginate impression materials poured immediately and after specific storage periods. Methods and Materials Five alginates were tested: CA 37 (Cavex); Jeltrate (Dentsply Caulk); Jeltrate Plus (Dentsply Latin America); Hydrogum 5 (Zhermack); and Alginoplast (Heraeus Kulzer). A master model was mounted on a special device and used to obtain the impressions. These impressions were stored at 23°C and 100% relative humidity, then poured with gypsum immediately, and again after 24, 72 and 120 hours. The casts were measured and the data were analyzed by one way analysis of variance (ANOVA) and Tukey test at p<0.05. Results The dimensional stability of the alginate impressions was both material and time dependent (p<0.05). After 24 hours of storage, only Alginoplast and Hydrogum 5 comply with the master model (p>0.05). After 72 and 120 hours, only Hydrogum 5 was dimensionally stable (p>0.05). Conclusion The dimensional stability of the alginate impressions is influenced by the selected material and the storage time. Clinical Significance Alginate impressions should generally be poured immediately. However, some new types of alginate may have the pouring delayed. Citation Sedda M, Casarotto A, Raustia A, Borracchini A. Effect of Storage Time on the Accuracy of Casts Made from Different Irreversible Hydrocolloids. J Contemp Dent Pract 2008 May; (9)4:059-066.

scholarly journals Survey of current materials and impression techniques for Complete Dentures among Nepalese Prosthodontists

2018 ◽  
Vol 14 (2) ◽  
pp. 75-80
Author(s):  
Amar Bhochhibhoya ◽  
Binod Acharya ◽  
Samskar Bickram Rana ◽  
Rinu Sharma ◽  
Jemish Acharya ◽  
...  
Keyword(s):  
Acrylic Resin ◽  
Complete Denture ◽  
Complete Dentures ◽  
Medical College ◽  
Institutional Review ◽  
Impression Materials ◽  
Ethical Approval ◽  
Irreversible Hydrocolloid ◽  
Removable Prosthesis ◽  
Materials Used

ABSTRACTBackground: Impression making is one of the critical factors in determining success or failure of complete denture therapy. The precise reproduction of edentulous foundation is essential for retention, stability, and support of the removable prosthesis. Evidence suggests that there is variability in materials and techniques regarding impressions making for complete dentures. There is little published information on studies conducted among Nepalese Prosthodontists. The purpose of this study was to evaluate current materials andmethods for impressions for complete denture prosthodontics in Nepal. Materials & Methods: A questionnaire based survey was conducted among Nepalese Prosthodontists. Ethical approval for the beginning of the study was obtained via Institutional Review Committee, Nepal Medical College. A self-administered anonymous questionnaire was distributed to the participants. Data were analyzed by using frequency distribution.Results: Majority of responses indicated use of irreversible hydrocolloid in stock metal tray for making the preliminary impression. The selective pressure was the predominantly used impression philosophy (78.3%). The most common material for the fabrication of custom trays was autopolymerizing acrylic resin (96.7%). All respondents border molded the custom tray prior to making the final impression. The final impression materials used were zinc oxide eugenol impression paste (73.3%), polyvinylsiloxane (11.7%), polyether (11.7%) and polysulphide (3.3%). Conclusion: Although there is variability in impression materials andtechniques used by Prosthodontists in Nepal for the fabrication of complete dentures, the results showed interesting trends. Most practitioners followed the traditional techniques of complete denture impression procedures.Keywords: complete denture; custom tray; edentulism; impression.

scholarly journals Analysis of vertical marginal discrepancy in feldspathic porcelain crowns manufactured with different CAD/CAM systems: Closed and open

2018 ◽  
Vol 12 (01) ◽  
pp. 123-128
Author(s):  
Fabio Kricheldorf ◽  
Cleuber Rodrigo de Souza Bueno ◽  
Wilson da Silva Amaral ◽  
Joel Ferreira Santiago Junior ◽  
Hugo Nary Filho
Keyword(s):  
Computer Aided Design ◽  
Manufacturing Systems ◽  
Marginal Adaptation ◽  
Significance Level ◽  
Significant Difference ◽  
Computer Aided ◽  
Cad Cam ◽  
Marginal Discrepancy ◽  
Feldspathic Porcelain ◽  
Ceramic Crowns

ABSTRACT Objective: The objective of this study is to compare the marginal adaptation of feldspathic porcelain crowns using two computer-aided design/computer-aided manufacturing systems, one of them is open and the other is closed. Materials and Methods: Twenty identical titanium abutments were divided into two groups: open system (OS), where ceramic crowns were created using varied equipment and software, and closed system (CS), where ceramic crowns were created using the CEREC system. Through optical microscopy analysis, we assess the marginal adaptation of the prosthetic interfaces. The data were subjected to the distribution of normality and variance. The i-test was used for the analysis of the comparison factor between the groups, and the one-way ANOVA was used to compare the variance of crown analysis regions within the group. A significance level of 5% was considered for the analyses. Results: There was a significant difference between the systems (P = 0.007), with the CS group having the higher mean (23.75 pm ± 3.05) of marginal discrepancy when compared to the open group (17.94 pm ± 4.77). Furthermore, there were no differences in marginal discrepancy between the different points between the groups (P > 0.05). Conclusions: The studied groups presented results within the requirements set out in the literature. However, the OS used presented better results in marginal adaptation.

scholarly journals Dimensional changes of alginate impression by using perforated and non-perforated ring trays

2010 ◽  
Vol 22 (1) ◽  
Author(s):  
Sumadhi Sastrodihardjo
Keyword(s):  
Dimensional Change ◽  
Base Diameter ◽  
Impression Material ◽  
Dimensional Changes ◽  
Base Area ◽  
Change Mechanism ◽  
Impression Materials ◽  
Significant Difference ◽  
Materials Used

Dimensional changes are a common occurrence in impressions, either during or after impression taking. It produces a difference in the dimensions of the object and the model, which leads to the restoration being ill-fitted. Several causal factors have been proposed such as friction between the impression material and the teeth, the bulk of the impression material, the type of impression materials used, the impression technique, the pouring time and many others. The exact causal factor is still unknown and the dimensional change mechanism is still poorly understood. The objective of this research was to investigate the role of the perforation on the ring trays in producing dimensional changes in the impression by using perforated and non-perforated ring trays. Alginate impressions were made on the frustum of cone metal master die with a 7.08 mm base diameter, 7.03 mm top diameter and 9.23 mm height using perforated and non-perforated ring trays with 9.40 mm in diameter and 14.17 mm in height. The dimensional change was determined by comparing the dimension of the dental stone die and its metal master die. The results showed that the percentage of dimensional changes that occurred by using perforated ring tray were (+) 0.56±0.40 on the top area, (-) 3.54±2.92 on base area and (+) 1.54±0.83 in height, respectively. As compared to using non-perforated ring trays, the percentage of dimensional changes that occurred were (-) 0.49±0.49 on top area, (-) 8.76±3.95 on base area and (+) 1.19±0.71 in height, respectively. There was a significant difference in the direction of the dimensional changes on both the top areas, but not in the base areas and height.

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