Application of Replica Technique and SEM in Accuracy Measurement of Ceramic Crowns

Trifković, Branka; Budak, Igor; Todorović, Aleksandar; Hodolič, Janko; Puškar, Tatjana; Jevremović, Danimir; Vukelić, Djordje

doi:10.2478/v10048-012-0016-7

Cited by 29 publications

(26 citation statements)

References 21 publications

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“…A number of studies have evaluated the accuracy of crowns and fixed dental prosthesis in vivo as well as in vitro . This technique offers the advantage that neither restoration nor abutment are destroyed during the assessment 1819…”

Section: Introductionmentioning

confidence: 99%

Comparison of the fit accuracy of zirconia-based prostheses generated by two CAD/CAM systems

Cho

2016

J Adv Prosthodont

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PURPOSEThe purposes of this study are to evaluate the internal and marginal adaptation of two widely used CAD/CAM systems and to study the effect of porcelain press veneering process on the prosthesis adaptation.MATERIALS AND METHODSMolar of a lower jaw typodont resin model was prepared by adjusting a 1.0 mm circumferential chamfer, an occlusal reduction of 2.0 mm, and a 5° convergence angle and was duplicated as an abrasion-resistant master die. The monolithic crowns and copings were fabricated with two different CAD/CAM system-Ceramil and Zirkonzahn systems. Two kinds of non-destructive analysis methods are used in this study. First, weight technique was used to determine the overall fitting accuracy. And, to evaluate internal and marginal fit of specific part, replica technique procedures were performed.RESULTSThe silicone weight for the cement space of monolithic crowns and copings manufactured with Ceramil system was significantly higher than that from Zirkonzahn system. This gap might cause the differences in the silicone weight because the prostheses were manufactured according to the recommendation of each system. Marginal discrepancies of copings made with Ceramil system were between 106 and 117 µm and those from Zirkonzahn system were between 111 and 115 µm. Marginal discrepancies of copings made with Ceramil system were between 101 and 131 µm and those from Zirkonzahn system were between 116 and 131 µm.CONCLUSIONMarginal discrepancy was relatively lower in Ceramil system and internal gap was smaller in Zirkonzahn system. There were significant differences in the internal gap of monolithic crown and coping among the 2 CAD/CAM systems. Marginal discrepancy produced from the 2 CAD/CAM systems were within a reported clinically acceptable range of marginal discrepancy.

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Section: Introductionmentioning

confidence: 99%

Comparison of the fit accuracy of zirconia-based prostheses generated by two CAD/CAM systems

Cho

2016

J Adv Prosthodont

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“…Trifkovic et al; evaluated the application of electron microscope and replica technique in marginal and internal gap measurements, they found that electron microscope is reliable regarding marginal gap evaluation. The values of marginal fits in ceramic crowns evaluated by the replica technique were statistically significantly lower compared to the values obtained by Electron Microscope 35 Some studies evaluated effect of the crown preparation margin and die type on the marginal accuracy of fiber-reinforced composite crowns. They compared the chamfer and shoulder finish line on stone and epoxy dies.…”

Section: Discussionmentioning

confidence: 81%

Comparing of Marginal and internal fit of Monolithic Zircon crown Fabricated by 3D Printed Die versus Conventional

Korsel

2018

Egyptian Dental Journal

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Purpose: Evaluation of marginal and internal fit of monolithic zircon crown restoration fabricated by scanning three different die material ;3D printed resin versus stone and epoxy resin dies. Materials and methods:A standardized Computer Numerical Control machine (CNC) will be used to fabricate a stainless steel master die simulating a prepared tooth with an occluso-gingival height of 6 mm, a taper of 6° and 1 mm shoulder circumferentially. The overall diameter of the die at the base is 8.5 mm Three groups of zircon crown (Prettau® Zirconia manufactured by Zirkonzahn® and E-Denstone®). 10 crowns per each group fabricated digitally from three different dies as follow: 1) First group (G1) 3D printed resin die (light cured methacrylate (Envision TEC). 2) Second group (GII), Epoxy resin die. 3) Third group (GIII) Type IV stone die (Zhermach spa, Bouazecchino ST, Badia polesine, Italy). Each crown fabricated from its specific die seated and stabilized on the master stainless steel die. Demark certain points on the crown margin and photographed using USB Digital microscope with a built-in camera (Scope Capture Digital Microscope, Guangdong, China) connected with an IBM compatible personal computer using a fixed magnification of 45X. Internal discrepancy of the copings was measured by a replica technique. Each coping was filled with light-body silicone (zetaplus, zhermack, italy), the replicas (heavy and light -body silicon) were carefully removed from the crown and sectioned mesio-distally into two equal segments with three regions measured on each section (margin, axial and occlusal), yielding 8 internal measurements for each coping. A digital image analysis system (Image J 1.43U, National Institute of Health, USA) was used to measure and qualitatively evaluate the gap width.Results: Data analysis was performed in several steps. Initially, descriptive statistics for each group results. One-way ANOVA followed by pair-wise Tukey's post-hoc tests were performed to detect significance between all groups. The absolute marginal gap mean ±SD values recorded for first group were (18.0305±6.99717), for II group were (41.0989± 21.55940) and for III group were (18.2960 ± 7.177245). It was found that the highest absolute marginal gap mean value recorded for IIgroup followed by III group mean value.While the lowest absolute marginal gap mean value recorded for I group. The difference between all die groups was statistically significant as revealed with one-way ANOVA test (p=0.01). Pair-wise Tukey's post-hoc test showed non-significant differences while (p=0.99) between (groups III,I), While between (groups II, III) and (groups II, I) there is significant differences where (p=0.01).(812) Amany M. Korsel E.D.

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“…Samples cut from 15 mm plate were austenitised at 1250 °C with holding time of 3 minutes. The first group of Technical Gazette 23, 3(2016), 761-767 [23,24], and the space orientation of cleavage facets was determined with electron backscatter diffraction (EBSD) method [25].…”

Section: Experimental Workmentioning

confidence: 99%

Effect of heat treatment on Charpy impact energy of microalloyed steel

et al. 2016

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Original scientific paper In this paper the microalloyed high-strength low-alloy (HSLA) Niomol 490K steel with an addition of niobium (0,032 wt. %) has been investigated. Heat treatment of the steel consisted of austenitisation at 1250 °C for 3 minutes and reheating up to 750 °C for 5 s. After austenitization the quenching was carried out in water with temperature of 70 °C and then in a lead bath up to 400 °C following cooling on the air. It was found that Charpy impact energy is higher and the transition temperature is lower for the transformation of austenite to bainite than to martensite microstructure. Experimental results showed that different fracture surface was observed. It is shown that preferred cleavage fracture occurred in the lattice plane (001) Utjecaj toplinske obrade na Charpy energiju udara mikrolegiranog čelikaIzvorni znanstveni rad U ovom radu istraživan je niskolegirani visokočvrsti čelik Niomol 490K koji sadrži dodatak niobija (0,032 mas. %). Toplinska obrada čelika se sastojala od austenitizacije pri 1250 °C u trajanju od 5 minuta i ponovnog zagrijavanja do 750 °C u trajanju od 5 s. Nakon austenitizacije provedeno je kaljenje u vodi kod temperature od 70 °C i u olovnoj kupci do temperature od 400 °C uz naknadno hlađenje na zraku. Utvrđeno je da je Charpy energija udara viša, a prijelazna temperatura niža za transformaciju austenita u bainit nego kod transformacije austenita u martenzitnu mikrostrukturu. Eksperimentalni rezultati su pokazali različite prijelomne površine. Pokazano je da je preferentno cijepajući prijelom zapažen po ravnini rešetke (001), neovisno o mikrostrukturi.

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Application of Replica Technique and SEM in Accuracy Measurement of Ceramic Crowns

Cited by 29 publications

References 21 publications

Comparison of the fit accuracy of zirconia-based prostheses generated by two CAD/CAM systems

Comparison of the fit accuracy of zirconia-based prostheses generated by two CAD/CAM systems

Comparing of Marginal and internal fit of Monolithic Zircon crown Fabricated by 3D Printed Die versus Conventional

Effect of heat treatment on Charpy impact energy of microalloyed steel

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