Journal articles: 'Metal-ceramic crowns'

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Swati, Sikka, R. Chowdhary, and P. S. Patil. "Marginal Strength of Collarless Metal Ceramic Crown." International Journal of Dentistry 2010 (2010): 1–5. http://dx.doi.org/10.1155/2010/521470.

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Metal ceramic restorations have been implicated for the discoloration in area of labiogingivalmargin. Attempts to rectify this, by altering the design of metal frameworkswill lead to decrease in fracture strength atmargin. This in vitro study compared the fracture strength at margins of metal ceramic crowns cemented to metal tooth analogs. Crowns evaluated with different marginal configurations, shoulder and shoulder bevel with 0 mm, 0.5 mm, 1 mm, and 1.5 mm, were selected.Methods. Maxillary right canine typhodont tooth was prepared to receive a metal ceramic crown with shoulder margin. This was duplicated to get 20 metal teeth analogs. Then the same tooth was reprepared to get shoulder bevel configuration. These crowns were then cemented onmetal teeth analogs and tested for fracture strength atmargin on an Instron testing machine. A progressive compressive load was applied using 6.3 mm diameter rod with crosshead speed of 2.5 mm per minute. Statisticaly analysis was performed with ANOVA, Student's “t” test and “f” test.Results. The fracture strength of collarless metal ceramic crowns under study exceeded the normal biting force. Therefore it can be suggested that collarless metal ceramic crowns with shoulder or shoulder bevel margins up to 1.5 mm framework reduction may be indicated for anteriormetal ceramic restorations.Significance. k Collarless metal ceramic crowns have proved to be successful for anterior fixed restorations. Hence, it may be subjected to more clinical trials.

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de Jesus Tavarez, Rudys Rodolfo, Mateus R. Tonetto, EM Maia Filho, Valdimar S. Valente, Carlos E. Francischone, CD Vilarinho Soares de Moura, CE Francischone Júnior, Antonio M. Silva, and Izabella S. Ribeiro. "Marginal Fit Metal–Ceramic and In-Ceram Single Crown Cement retained in Implant-supported Abutments." Journal of Contemporary Dental Practice 17, no. 12 (2016): 969–72. http://dx.doi.org/10.5005/jp-journals-10024-1965.

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ABSTRACT Introduction This study evaluated the cervical fit of cemented metal–ceramic and In-Ceram implant-supported crowns, before and after the cementing procedure. Materials and methods Twenty crowns cemented on implant abutments are divided into two groups (n = 10): Group 1 – cemented metal–ceramic crowns and group 2 – cemented In-Ceram crowns. The marginal adaptations before and after cementation were evaluated in a comparison microscope with an error of 1 μm. All crowns were cemented with zinc phosphate cement. Results The cervical misalignment of cemented crowns before cementation (52.65 ± 11.83 and 85.73 ± 14.06 μm) was lower than that after cementation (66.80 ± 15.86 and 89.36 ± 22.66 μm). Conclusion The cementing procedure interferes with the marginal fit of cemented crowns on implant abutments, with the prosthesis having better adaptation before cementation. Cemented metal–ceramic crowns exhibited better cervical adaptation than In-Ceram crowns cemented before and after the cementing procedure. Clinical significance The maintenance of gum health and the longevity of prosthetic restorations are closely related to the restoration's marginal integrity. How to cite this article Valente VS, Francischone CE, Vilarinho Soares de Moura CD, Francischone Júnior CE, Silva AM, Ribeiro IS, Maia Filho EM, Bandéca MC, Tonetto MR, de Jesus Tavarez RR. Marginal Fit Metal–Ceramic and In-Ceram Single Crown Cement retained in Implant-supported Abutments. J Contemp Dent Pract 2016;17(12):969-972.

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Manozzo Kunz, Patrícia Valéria, Gabriela Andrade Serpa, Leonardo Fernandes da Cunha, Gisele Maria Correr, and Carla Castiglia Gonzaga. "Fit of metal-ceramic crowns." Brazilian Journal of Oral Sciences 21 (August 27, 2021): e225136. http://dx.doi.org/10.20396/bjos.v21i00.8665136.

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Aim: To evaluate the influence of cobalt-chromium (Co-Cr) coping fabrication methods and ceramic application on the marginal and internal fit of metal-ceramic crowns. Methods: Co-Cr copings for metal-ceramic crowns were prepared by lost wax casting or CAD-CAM machining of sintered blocks. The fit was analyzed using the silicone replica technique at four assessment points: marginal gap (MG), axial wall (AW), axio-occlusal (AO) angle, and central occlusal (CO) wall. After the initial analysis, the copings were ceramic-veneered with the layering technique, and the fit was again determined. Data were statistically analyzed by paired and unpaired Student’s-t test (α=0.05). Results: Marginal and internal fit before ceramic application according to the coping manufacturing method showed significant differences only at CO (p < 0.001), with milled copings (137.98±16.71 μm) showing higher gap values than cast copings (112.86±8.57 μm). For cast copings, there were significant differences at MG (before 109.13±8.79 μm; after 102.78±7.18 μm) and CO (before 112.86±8.57 μm; after 104.07±10.63 μm) when comparing the fit before and after ceramic firing. For milled copings, there was significant difference only at AO (before 116.39±9.64 μm; after 108.54±9.26 μm). Conclusion: This study demonstrated that the coping fabrication method influenced the internal fit. Ceramic firing maintained or improved the fit of the metal-ceramic crowns. The marginal discrepancy of all restorations, before and after ceramic firing, can be considered clinically acceptable.

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Medic, Vesna, Kosovka Obradovic-Djuricic, Slobodan Dodic, and Renata Petrovic. "In vitro evaluation of microleakage of various types of dental cements." Srpski arhiv za celokupno lekarstvo 138, no. 3-4 (2010): 143–49. http://dx.doi.org/10.2298/sarh1004143m.

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Introduction. Microleakage is defined as the clinically undetectable seepage of oral fluids containing bacteria and debris between cement layer and tooth restoration. Objective. This in vitro study investigated the effect of different dental cements (zinc-phosphate, polycarboxylate, glass-ionomer and resin cement) on microleakage in different ceramic crown systems (metal ceramic crown, metal ceramic crown with a porcelain margin, Empress 2 and In Ceram all-ceramic crowns) fixed on extracted human teeth. Methods. One hundred and sixty intact human premolars were randomized to four groups of forty teeth each, according to the different ceramic crown systems. They were prepared in a standardized manner for metal-ceramic and all-ceramic crowns. Crowns were made following a standard laboratory technique, and each group of crowns were divided into four groups according to the different cement agents and cemented on their respective abutments. The specimens were subjected to thermocycling, placed in methylene blue solutions, embedded in resin blocks and vertically cut in the bucco-oral and meso-distal direction. The microleakage in the area of tooth-cement interface was defined as linear penetration of methylene blue and was determined with a microscope to assign microleakage scores using a five-point scale. Results. A significant association was found between a cement type and degree of microleakage (p=0.001). No statistically significant differences were found among the different ceramic crown systems luted with the same dental cement. The smallest degree of microleakage was observed in specimens luted with resin cement (X=1.73), followed by glass-ionomer cement (X=2.45) and polycarboxylate cement (X=3.20). The greatest degree of microleakage was detected in the crowns fixed with zincphosphate cement (X=3.33). Conclusion. The investigated dental cements revealed different sealing abilities. The use of resin cement resulted in the percentage of 0 microleakage scores. Due to this feature, the resin cement is to be recommended in everyday clinical practice.

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Lee, Ki-Hong, In-Sung Yeo, Benjamin M. Wu, Jae-Ho Yang, Jung-Suk Han, Sung-Hun Kim, Yang-Jin Yi, and Taek-Ka Kwon. "Effects of Computer-Aided Manufacturing Technology on Precision of Clinical Metal-Free Restorations." BioMed Research International 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/619027.

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Purpose. The purpose of this study was to investigate the marginal fit of metal-free crowns made by three different computer-aided design/computer-aided manufacturing (CAD/CAM) systems.Materials and Methods. The maxillary left first premolar of a dentiform was prepared for all-ceramic crown restoration. Thirty all-ceramic premolar crowns were made, ten each manufactured by the Lava system, Cercon, and Cerec. Ten metal ceramic gold (MCG) crowns served as control. The marginal gap of each sample was measured under a stereoscopic microscope at 75x magnification after cementation. One-way ANOVA and the Duncan’s post hoc test were used for data analysis at the significance level of 0.05.Results. The mean (standard deviation) marginal gaps were 70.5 (34.4) μm for the MCG crowns, 87.2 (22.8) μm for Lava, 58.5 (17.6) μm for Cercon, and 72.3 (30.8) μm for Cerec. There were no significant differences in the marginal fit among the groups except that the Cercon crowns had significantly smaller marginal gaps than the Lava crowns(P<0.001). Conclusions. Within the limitation of this study, all the metal-free restorations made by the digital CAD/CAM systems had clinically acceptable marginal accuracy.

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Vahidi, Farhad, Erwin T. Egloff, and Francis V. Panno. "Evaluation of marginal adaptation of all-ceramic crowns and metal ceramic crowns." Journal of Prosthetic Dentistry 66, no. 4 (October 1991): 426–31. http://dx.doi.org/10.1016/0022-3913(91)90499-m.

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Anusavice, K. J., and B. Hojjatie. "Stress Distribution in Metal-Ceramic Crowns with a Facial Porcelain Margin." Journal of Dental Research 66, no. 9 (September 1987): 1493–98. http://dx.doi.org/10.1177/00220345870660091601.

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The use of metal-ceramic restorations with porcelain butt-joint facial margins has increased in the past several years. Although these crowns exhibit improved esthetics compared with metal-ceramic crowns which display a metal gingival collar or metal knife-edge margin, the effectiveness of this design in resisting intra-oral forces is not known. The objective of this study was to analyze the stress distribution induced by simulated intra-oral loads on crowns with variable coping configurations. The copings, with a thickness of either 0. 1 or 0.3 mm, were modeled with a facial termination of metal at three locations: at the gingival floor, 0.9 mm above the gingival floor, and 4.2 mm above the gingival floor. The coping and crown dimensions were based on a prepared maxillary central incisor with a facial shoulder and a lingual chamfer. Both Ni-Cr and Au-Pd alloy copings were employed in the crown models. Finite element stress analyses were performed on crowns which were subjected to several loading conditions. A cement film thickness of 0.030 mm was assumed. For all cases, the stresses which developed in porcelain and cement near the facial and lingual margins due to a vertical load of 200 N were predominately compressive in nature. For the crowns with Ni-Cr copings, the tensile stress in porcelain ranged from 11.0 MPa (for crowns with a facial metal thickness of 0.3 mm) to 12.5 MPa (for a metal thickness of 0.1 mm). The corresponding stresses for crowns with Au-Pd alloy copings were 8.3 MPa and 8.6 MPa, respectively. Maximum compressive stresses in cement near the lingual margin were 22.3 MPa for the Ni-Cr crowns and 30.0 MPa for the Au-Pd crowns. The maximum tensile stress in porcelain was 29.0 MPa and occurred near the area of loading for the Au-Pd case. The maximum tensile stress in the facial porcelain region (8.3 MPa) developed within the incisal third of the facial surface. Under the conditions assumed in this study, the alloy type, coping thickness, and coping termination point have a negligibly small effect on the stresses induced in porcelain or cement near the facial margin.

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V. Geshoska, Katerina, and Jagoda Bajevska. "Effect of manufacturing protocol on the internal fit and marginal discrepancy of metal ceramic and full ceramic dental crowns." Macedonian Pharmaceutical Bulletin 63, no. 01 (2018): 69–74. http://dx.doi.org/10.33320/maced.pharm.bull.2017.63.01.008.

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The accuracy of internal fit and marginal precision plays important role of clinical quality and success of dental crowns. Complications caused by marginal discrepancies such as caries, gingivitis, hypersensitivity are highlighted in dental literature. Despite marginal fit, internal fit and precision have a significant role in the persistence of full ceramic and metal ceramic crowns. As the technology evolves, it’s questionable which impression and manufacturing method is giving most accurate dental crowns. Therefore, the main purpose of this study is to get some information and data about marginal and internal fitting of dental crowns made by conventional, two-phase impression technique with polyvinyl siloxanes, and using different manufacturing process. Keywords: internal fit, marginal discrepancy, metal ceramic, full ceramic crowns

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Theng, Kai Yuan, Muchtar Andanastuti, Mohamed M. Aboras, Norziha Yahaya, and Mariyam Jamaludin Ghazali. "Properties and Survival Rate of all Ceramics Dental Crown: A Review." Applied Mechanics and Materials 465-466 (December 2013): 857–61. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.857.

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All-ceramic dental crown restoration is popular because it results in better aesthetic quality than metal alloy restoration. Ceramics also show superior biocompatibility and inertness to human biological systems. However, clinical experience indicates that all-ceramic crowns are not as durable as their porcelain-fused-to-metal counterparts, particularly on molar teeth. New ceramic biomaterials that combine durability with excellent aesthetic qualities have been developed. In this study, several promising bioceramics for dental crown applications are evaluated and compared. The evaluated parameters include strength of the material, survival rate in clinical performance, and aesthetic quality.

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Badran, Noha, Sanaa Abdel Kader, and Fayza Alabbassy. "Effect of Incisal Porcelain Veneering Thickness on the Fracture Resistance of CAD/CAM Zirconia All-Ceramic Anterior Crowns." International Journal of Dentistry 2019 (August 26, 2019): 1–12. http://dx.doi.org/10.1155/2019/6548519.

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Statement of Problem. In some clinical situations, the vertical length of either a prepared tooth or an implant abutment is short, while the occlusal clearance to be restored by a porcelain crown is large. Incisal thickness of the veneering porcelain should be considered to prevent mechanical failure of the crown. Purpose. The aim of this study is to evaluate the effect of two different incisal veneering porcelain thickness on the fracture resistance of the anterior all-ceramic CAD/CAM zirconia crown system as compared with the conventionally used metal ceramic crown system. Method. CAD/CAM zirconia all-ceramic and metal ceramic crowns were fabricated on the prepared dies with standardized dimensions and designs using standardized methods according to the manufacturer’s instructions. All crowns were then adhesively luted with resin-based cement (Multilink cement system), subjected to thermal cycling and cyclic loading, and were loaded until fracture using the universal testing machine to indicate the fracture resistance for each crown material in each veneering thickness. Results. Statistical analysis was carried out, and the results showed that the fracture resistance of the nickel-chromium metal ceramic group was significantly higher than that of the CAD/CAM zirconia all-ceramic group. Also, the fracture resistance of crowns with 1.5 mm incisal veneering thickness was significantly higher than those with 3 mm incisal veneering thickness in both groups. Furthermore, there was no significant difference in the fracture mode of the two groups where 50% of the total specimens demonstrated Mode II (veneer chipping), while 35% demonstrated Mode I (visible crack) and only 15% demonstrated Mode III (bulk fracture). Conclusion. High failure load values were demonstrated by the specimens in this study, which suggest sufficient strength of both incisal veneering thickness in both crown systems to withstand clinical applications; however, the fracture patterns still underline the requirement of a core design that support a consistent thickness of the veneering ceramic, and it is recommended to conduct long-term prospective clinical studies to confirm findings reported in the present study.

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Batra, Pranshu. "A Comparative Shade Evaluation of Two Different All-Ceramic Materials over Three Core Build-up Materials: An in vitro Study." Journal of Contemporary Dentistry 2, no. 2 (2012): 15–21. http://dx.doi.org/10.5005/jp-journals-10031-1003.

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ABSTRACT Aim To evaluate and compare the shade of zirconia and alumina crowns over composite, all-ceramic and metal core material. Objectives (1) To evaluate the influence of composite core build-up material on the shade of zirconia and alumina crowns. (2) To evaluate the influence of all-ceramic core material on the shade of zirconia and alumina crowns. (3) To evaluate the influence of metal core material on the shade of zirconia and alumina crowns. (4) To compare the influence of composite, all-ceramic and metal core material on the shade of zirconia and alumina crowns. Materials and Methods The all-ceramic materials used for fabrication of crowns were zirconia (LAVA) and alumina (PROCERA). They were evaluated spectrophotometrically for the change in shade when placed over three core build-up materials. Results The observations obtained were statistically analyzed by analysis of variance. Zirconia crowns when compared with alumina crowns showed the least shade change when placed on the three core materials. Among the three core materials used, composite core build-up material showed the least change in the shade. Conclusion Zirconia crowns showed least shade change when placed on the three core materials. How to cite this article Batra P, Ram SM. A Comparative Shade Evaluation of Two Different All-Ceramic Materials over Three Core Build-up Materials: An in vitro Study. J Contemp Dent 2012;2(2):15-21.

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Konnov, V. V., M. R. Harutyunyan, M. V. Vorobieva, A. S. Khodorich, R. N. Mukhamedov, and D. A. Domenyuk. "Clinical efficiency of orthopedic treatment of dental defects by arc prostheses with polyoxymethylene frame." Medical alphabet, no. 3 (June 12, 2020): 29–34. http://dx.doi.org/10.33667/2078-5631-2020-3-29-34.

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Currently, manufacturing techniques for removable orthopedic structures made of thermoplastic materials are widely used.Objective. To determine the clinical effectiveness of orthopedic treatment of dentition defects with arch prostheses with a framework made of polyoxymethylene using a modified design of supporting metal-ceramic crowns. Using clinical methods, 76 patients with defects in the dentition were examined, who underwent orthopedic treatment with arch prostheses with a frame made of metal and polyoxymethylene. As a result of the study, the clinical efficacy of using the proposed design of a metal-ceramic crown for a support-retaining clasp made of polyoxymethylene and a method for creating a retention zone in a ceramic-metal crown is proved.

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Savencu, Cristina Elena, Sorin Porojan, and Liliana Porojan. "Analysis of Internal and Marginal fit of Metal-ceramic Crowns During Processing, Using Conventional and Digitized Technologies." Revista de Chimie 69, no. 7 (August 15, 2018): 1699–701. http://dx.doi.org/10.37358/rc.18.7.6398.

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Copings accuracy is an important factor for long-term clinical success of ceramic fused to metal dental restorations. The purpose of the study was to investigate marginal and internal fit of metal-ceramic crowns during processing, using conventional and digitized technologies. Metal copings were produced by Digital light Processing (DLP), invested and casted. Ceramic veneers were overpressed. Internal and marginal fit was measured using silicon replica technique for patterns, casted frameworks and final ceramic fused to metal crowns. Best adaptation was found in resin-pattern group, with small increasing of gap after casting and after ceramic pressing.

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Czepułkowska, W., E. Wołowiec-Korecka, and L. Klimek. "The role of mechanical, chemical and physical bonds in metal-ceramic bond strength." Archives of Materials Science and Engineering 1, no. 92 (July 1, 2018): 5–14. http://dx.doi.org/10.5604/01.3001.0012.5506.

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Purpose: A review regarding the mechanisms of metal-ceramic join is presented. Design/methodology/approach: The impact of the air-abrasion parameters on the mechanical bond strength of the ceramic crowns was discussed. The presence of opaque on the chemical bond was analysed. Research of the influence of the difference in the coefficient of thermal expansion values on the metal-ceramic bond was included. The methods of testing the bond strength were analysed. Findings: The metal substructure-dental ceramic bond strength is affected by all types of bond. In bond strength, 3-point bending test and shear test are mainly used. Created samples simulate the ceramic crowns veneered on one side. The role of physical bond on ceramic crowns veneered around metal substructure is unknown. Research limitations/implications: The prosthetic restorations with the ceramic surrounding whole the metal substructure are commonly used. The impact of shrinkage in the cylindrical deposition of the ceramic on metal substructure should be analysed. Practical implications: Numerical analysis and FEM simulation can be helpful in the analysis of the physical bond between the metal substructure and the dental ceramic around it. Originality/value: The impact of the type of the bond to metal-ceramic bond strength is presented, taking into account the cognitive gap in the influence of the coefficient of thermal expansion on the cylindrical placement of ceramic on the substructure.

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Anusavice, K. J., and J. E. Carroll. "Effect of Incompatibility Stress on the Fit of Metal-Ceramic Crowns." Journal of Dental Research 66, no. 8 (August 1987): 1341–45. http://dx.doi.org/10.1177/00220345870660081101.

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The interactive effect of coping thickness and a positive thermal contraction mismatch between metal and porcelain on the fit of metal-ceramic crowns has not yet been experimentally determined. Previous studies have suggested that marginal distortion may be due to contraction differences, although finite element analyses indicate that these distortion effects should be negligible. The marginal gap between metal-ceramic crowns and prepared dies was determined under conditions designed to exaggerate distortion effects. These included the use of thin metal copings (0.1 and 0.2 mm), a chamfer preparation, an alloy with relatively poor creep resistance, and a large thermal contraction mismatch between the alloy and porcelain layers. Gap changes which resulted during porcelain firing cycles were relatively small, but larger marginal discrepancies developed in crowns prepared with a compatible porcelain during grinding and abrasive blasting procedures. This study conclusively demonstrates that incompatibility stress induced by a positive contraction mismatch is not a primary cause of marginal or generalized distortion of metal-ceramic crowns and suggests that external grinding and internal abrasive blasting of crowns are more likely causes of this effect.

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Mattoo, Khurshid A., Faisal M. Alkhayrat, Hussam A. Madkhali, Ibrahim H. Geathy, Mohammed AW Qahhar, and Ahmed Yaqoub. "Subjective Differences between Dentists and Patients about Relative Quality of Metal Ceramic Restorations placed in the Esthetic Zone." Journal of Contemporary Dental Practice 18, no. 2 (2017): 112–16. http://dx.doi.org/10.5005/jp-journals-10024-2000.

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ABSTRACT Introduction Esthetic perceptions could differ between the dentist and his patients among various regions and cultures. Aim The aims of this study were to evaluate the subjective differences between the dentist and the patient in terms of esthetics of metal-ceramic crowns (MCcs). The study also aims to compare the mesiodistal (MD) and buccolingual (BL) dimensions of the cemented crown with its respective natural antimeric tooth. Materials and methods A total of 85 patients seeking treatment for a single crown (MC) were treated by the undergraduate students under supervision of respective academic staff. After cementation of the crowns, a 9-point questionnaire was given to patient and different dentists. A treatment cast for every single crown was poured. Then, the MD and BL dimensions of the crowns were compared against their respective antimeric tooth. Results The dentists and the patients agreed in the range of 50.5 to 90.5%. Least subjective differences were found for the length and width of the cemented crowns. The highest differences were noted for symmetry between the cemented crown and its antimeric natural tooth. A total of 31 to 38% of the patients differed from the dentist's evaluation for shade of the crown, color of the crown at the margin, contour of the crown, and the relationship of the crowns with the surrounding gingiva. The highest MD and BL dimensions were in the cemented crown of canines, while the lowest MD and BL diameters were for the cemented crowns of the lateral incisor crowns. Conclusion Dentist and patient mostly agreed in terms of length (90%), width (81%) and relation of crown with free gingiva (74%). However, they differed mostly on the symmetry of the cemented crowns. The highest MD dimensions and BL diameter were in the cemented MCcs of canine, while the lowest were with lateral incisors. Clinical significance While fabricating a dental prosthesis, the dentist must know about patients’ perception of esthetics; otherwise both clinical and laboratory efforts would not be enough to satisfy the esthetic needs of the patient even if the restoration is technically correct. Perceptions related to symmetry differ mostly between dentist and patient. How to cite the article Al Moaleem MM, Alkhayrat FM, Madkhali HA, Geathy IH, Qahhar MAW, Yaqoub A, Mattoo KA. Subjective Differences between Dentists and Patients about Relative Quality of Metal Ceramic Restorations placed in the Esthetic Zone. J Contemp Dent Pract 2017;18(2):112-116.

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Ryniewicz, Andrzej, Anna M. Ryniewicz, Łukasz Bojko, Paweł Pałka, and Wojciech Ryniewicz. "THE ASSESSMENT OF THE LAYERED STRUCTURE OF PROSTHETIC CROWNS IN MICROSCOPIC EXAMINATIONS." Tribologia 292, no. 4 (November 30, 2020): 59–70. http://dx.doi.org/10.5604/01.3001.0014.5908.

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Prosthetic crowns are made in accordance with the principles of clinical procedures while taking into account the rules of endurance, biocompatibility, and aesthetics. Depending on the biomaterial and manufacturing technology, crown frameworks are veneered with an appropriate set of ceramics with selected thermal expansion. The veneering layers responsible for tribological cooperation in occlusal contact should properly adhere to the framework. The aim of the research is to conduct the microscopic and EDS chemical analysis to evaluate the process of shaping veneering layers on frameworks produced using new digital technologies, i.e. the technology of milling and laser sintering. The research material consists of specimens produced in perpendicular cross-sections through the layered structures of metal-ceramic, ceramic-veneered glassceramic, and zirconium crowns. The microscopic examinations were carried out using the specimens and included the elemental EDS analysis performed on the surfaces and in certain points. The structures of metal and ceramic frameworks, ceramic veneering layers, and adhesive zones were determined.

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Savencu, Cristina Elena, Costela Șerban, and Liliana Porojan. "Adaptability Evaluation of Metal-Ceramic Crowns Obtained by Additive and Subtractive Technologies." Applied Sciences 10, no. 16 (August 11, 2020): 5563. http://dx.doi.org/10.3390/app10165563.

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(1) Background: Traditional metal-ceramic restorations are considered as a standard in the evaluation of new technologies. A critical factor in their longevity is represented by their adaptability; The purpose of this study was to evaluate the marginal and internal gap of ceramic-fused to metal crowns with frameworks obtained by additive manufacturing (AM) technologies and the influence of veneering process on their fit; (2) Methods: Metal-ceramic crowns have been produced by conventional lost-wax technology (T), digital milling (F), selective laser sintering (SLS) and selective laser melting (SLM). The adaptability was assessed using silicone replicas before and after ceramic veneering; (3) Results: The best values were obtained for the milled group followed closely by SLM and SLS, and a significantly higher gap for casted copings. The veneering process did not significantly influence the adaptability of the crowns, regardless of the manufacturing process used for frameworks. The present study promotes additive technologies (AT) as a fast, efficient, and cost-effective alternative to traditional technology. There are fewer steps in which errors can occur when digital technologies are used and the risk of distortion is diminished. (4) Conclusions: CAD/CAM technologies, both additive and subtractive, represent an excellent option to produce time-effective, precise metal-ceramic crowns with excellent adaptation.

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Subramani, Karthikeyan. "Are ceramic implant-supported single crowns clinically better than metal-ceramic implant-supported single crowns?" Evidence-Based Dentistry 22, no. 3 (January 2021): 100–101. http://dx.doi.org/10.1038/s41432-021-0203-1.

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Nesterov, Alexander M., Mukatdes I. Sadykov, and Vladislav V. Matrosov. "Analysis of orthopedic treatment of patients with stump pins inserts with artificial crown in significant destruction of the clinical dental crown: the data of archival materials of the dental clinic." Aspirantskiy Vestnik Povolzhiya 20, no. 1-2 (December 10, 2020): 96–101. http://dx.doi.org/10.17816/2072-2354.2020.20.1.96-101.

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The aim of the article is to analyze the orthopedic treatment of patients with a lack of clinical tooth crowns by means of stump pin inserts with an artificial crown presented in the archival materials from the dental clinic of Samara. Research methods. Health records of dental patients and the orthopaedic work orders of the Dental Clinic No. 2 of the city of Samara over the period of 20152019 were analyzed. Results. Of the total number of patients (142,394 people), 5370 patients underwent a stump pin insert to restore a missing tooth crown. A total of 5802 pin stump tabs were made for these patients. 524 patients (10.09%) had complications. Most complications were observed in the lateral group of patients with prosthetic teeth (62.18%). Discementation of crowns from stump pin inserts was the main complication (53.32%). Ceramic crown chipping from metal-ceramic crowns was observed in 6.46% of all complications.

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Oancea, Luminita, Alexandru Petre, Mihai Burlibasa, Eugenia Eftimie Totu, and Corina Marilena Cristache. "Variability in Colour Reproduction of Metal-Ceramic Crowns." Revista de Chimie 69, no. 10 (November 15, 2018): 2655–61. http://dx.doi.org/10.37358/rc.18.10.6600.

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The aim of the present study was to objectively assess the variability in color reproduction of metal-ceramic (MC) single crowns fabricated by blending different color of opaque and body ceramic in order to point out which shade of the ceramic layers influences mostly the final color of the restorations. Eight nickel-chromium ceramic metal alloy copings were fabricated, on the same cast, following by blending the ceramic for the specific A3 color as follows: one reference ceramic (R) was blended, according to the producer s recommendation, and seven tests crowns have been build-up by considering as variables each one of the two uniform opaque layers, and dentin layer. Color of each manufactured crowns was measured after the three important steps of the technological workflow: the last opaque layer, enamel-dentin correction and final glaze firing using Vita Easyshade spectrophotometer. The best final color match (color difference of deltaE=0.8) was obtained for specimen no. 5, with a lighter opaque firs layer (A1). Fabricated specimens of all groups, except for no.4, with a darker dentin layer (A 3.5), showed deltaE values between 0.8 and 2.8, in the limit of the threshold perception in the oral cavity, and were scored as good. Within the limits of the present study, we can conclude that the dentin-enamel layer mostly influences the final color of the MC crowns.

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Omar, H., O. Atta, and O. El-Mowafy. "Difference Between Selected and Obtained Shade for Metal-ceramic Crown Systems." Operative Dentistry 33, no. 5 (January 1, 2008): 502–7. http://dx.doi.org/10.2341/07-129.

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Clinical Relevance Veneered electroformed crowns and In-Ceram alumina crowns made with CEREC 3D produced shade-matching that was significantly better than that obtained with conventional porcelain-fused-to-metal crowns.

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Arora, Sheen J., Aman Arora, Ritu Sangwan, and Prachi Jain. "Restoring smile by esthetic intraradiular tooth reinforcement and metal free crown: a case report." International Journal of Scientific Reports 3, no. 3 (February 25, 2017): 87. http://dx.doi.org/10.18203/issn.2454-2156.intjscirep20170888.

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<p>Aesthetic management of maxillary anteriors provide a challenge to the artistic and technical abilities of a prosthodontist. Metal-free crowns in such cases allows for highly aesthetic solutions to reshape fractured teeth or teeth with other defects. In severely compromised anterior teeth, development of non-metallic post systems has made possible the generation of metal-free ceramic restorations. This article describes a case where all-ceramic crown reinforced with post was utilized to improve the esthetics of the patient. </p>

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Gwinner, Fernanda Pelogia, Marco Antonio Bottino, Lafayete Nogueira-Junior, and Alvaro Della Bona. "Effect of Finish Line on Marginal Fit of Sintered Gold Copings." Brazilian Dental Journal 24, no. 4 (July 2013): 322–25. http://dx.doi.org/10.1590/0103-6440201301575.

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The aim of this study was to evaluate the vertical marginal gap of sintered gold copings and metal-ceramic crowns with different finish line preparations: a beveled round shoulder (BRS) and a beveled long chamfer (BLC), testing the null hypotheses that there are no differences in marginal gap regardless of finish line and phase of restoration (coping or crown). Stainless steel master models were fabricated to simulate tooth preparation for metal-ceramic crowns with different finish lines (BRS and BLC). Ten dies were obtained from each model. Preparations were coated with 2 layers of spacer to 1 mm from the margin. Sintercast gold copings were prepared, sintered and adjusted to the dies. The copings (n=10) were placed onto the master model and the marginal gap was measured in 24 equidistant points using optical microscopy (X230). An opaque and two body ceramic layers were subsequently applied to the copings and the same measuring procedure was performed for the crowns. The data were analyzed statistically using paired and unpaired Student's t-test (α=0.05). Mean marginal gap values (µm) for the copings and crowns were, respectively: 113.6 and 117.1 for the BRS; and 58.2 and 74.3 for the BLC preparation. Significantly greater marginal gaps (p=0.0307) were found for restorations with BRS than with BLC finish line, which also showed statistically significant differences in the gap size between coping and crown (p=0.001). In conclusion, marginal gap is influenced by ceramic application on copings fabricated on BLC preparation, and greater marginal gaps were found for restorations with BRS finish line, rejecting the experimental null hypotheses.

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Gandhi, Kushal N., and Naisargi P. Shah. "Rejuvenating Smile with All-ceramic Crowns." Journal of Contemporary Dentistry 6, no. 1 (2016): 80–84. http://dx.doi.org/10.5005/jp-journals-10031-1147.

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ABSTRACT Smile enhancement for a patient instills self-confidence by rendering an attractive smile. All-ceramic restorations have the potential to replicate the natural esthetics close to natural dentition, i.e., lacking in metal ceramic restorations. A young female patient unhappy with her smile was rehabilitated with all-ceramic restorations; thereby, the beauty of an individual within the functional and physiological functions could be restored. The final outcome with regard to esthetics and function was found to be good. How to cite this article Gandhi KN, Ram SM, Shah NP. Rejuvenating Smile with All-ceramic Crowns. J Contemp Dent 2016;6(1):80-84.

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Martins, Leandro Moura, Fabio Cesar Lorenzoni, Alcides Oliveira de Melo, Luciana Mendonça da Silva, José Luiz G. de Oliveira, Pedro Cesar Garcia de Oliveira, and Gerson Bonfante. "Internal fit of two all-ceramic systems and metal-ceramic crowns." Journal of Applied Oral Science 20, no. 2 (April 2012): 235–40. http://dx.doi.org/10.1590/s1678-77572012000200019.

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Douglas, R. Duane, and Jane D. Brewer. "Acceptability of shade differences in metal ceramic crowns." Journal of Prosthetic Dentistry 79, no. 3 (March 1998): 254–60. http://dx.doi.org/10.1016/s0022-3913(98)70233-1.

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Salem, George. "Margin design for esthetic posterior metal ceramic crowns." Journal of Prosthetic Dentistry 60, no. 4 (October 1988): 418–24. http://dx.doi.org/10.1016/0022-3913(88)90240-5.

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Hassan, Tareq, and AM Aurangjeb. "Comparison of fiber-reinforced composite crowns and metal ceramic crowns according to attrition of opposing teeth." Update Dental College Journal 4, no. 1 (December 7, 2014): 21–26. http://dx.doi.org/10.3329/updcj.v4i1.21161.

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Back ground: Fiber reinforcement was introduced to clinical dentistry for the first time in the 1960s when investigators attempted to reinforce polymethyl- methacrylate dentures with glass or carbon fibers. It has recently been shown that crowns, bridges and posts made of FRC can be used successfully in dental practice and they are esthetically more acceptable than conventional metal ceramic crown. Aims: A prospective comparative cross-sectional study was performed involving 60 patients who attended in the out patients department of Prosthodontics, Faculty of Dentistry, BSMMU during the period of January 2007 to December 2008. Objective: Compare fiber-reinforced composite crowns and metal ceramic crowns according to attrition of opposing teeth. Methods: Clinical data were recorded from the randomly selected 60 patients divided in to tow groups experimental and control. Attrition of opposing teeth was indexed after California Dental Associations quality evaluation system. Results: In group A patients, 12(40.0%) were male and 18(60.0%) female. In group B patients 14(46.7%) were male and 16(53.3%) were female. All the patients were in grade I in both groups after 4 months. After 8 months all patients were in grade I in group A and 29(96.7%) patients were in grade I in group B. After 12 months all patients were in grade I in group A and 28(93.3%) patients were in grade I in group B. The difference was not statistically significant (p>0.05) in chi square test. Conclusion: The Fiber Reinforced Composite crown represents a valuable development in field of Prosthetic Dentistry. DOI: http://dx.doi.org/10.3329/updcj.v4i1.21161 Update Dent. Coll. j: 2014; 4 (1): 21-26

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Malara, P., K. Paluch, K. Sobolewska, and A. Pasieka. "Assessment of the compressive strength of the metal-ceramic connections in fixed dental restorations." Journal of Achievements in Materials and Manufacturing Engineering 79, no. 2 (December 1, 2016): 66–73. http://dx.doi.org/10.5604/01.3001.0010.0671.

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Purpose: The purpose of the work was to evaluate the compressive strength of metalceramicconnections in the fixed dental restorations.Design/methodology/approach: Restorations were made on a model of the naturalpatient's dentition which was developed specifically for this study. The study included 10metal - porcelain crowns, for each group of teeth. Their production used Remanium 2000+alloy and porcelain Vita VMK Master. A static compression test was carried out on the finalcrowns and Vicker's hardness test was performed. Visual observations were carried out ona scanning electron microscope.Findings: On the basis of the research and the discussion it was possible to concludethat metal-porcelain crowns have a greater compressive strength than natural human teeth.Thus, they are more resistant to occlusal forces and the crowns for the first molars are thestrongest restorations.Practical implications: The metal-porcelain crowns are a very good option for teethrestoration and they can be used even in the areas of the mouth where the occlusal forcesreach the maximum values.Originality/value: The article focuses on testing of compressive strength of metal-ceramiccrowns. The comparison with natural human occlusal forces shows the sufficient mechanicalproperties of metal-ceramic crowns for application in humans. The artificial tooth geometryallows applying prosthetic crowns in the patient's mouth without the risk of ceramic breakdown.

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Anusavice, K. J., B. Hojjatie, and P. H. Dehoff. "Influence of Metal Thickness on Stress Distribution in Metal-Ceramic Crowns." Journal of Dental Research 65, no. 9 (September 1986): 1173–78. http://dx.doi.org/10.1177/00220345860650091201.

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Freire, Yolanda, Esther Gonzalo, Carlos Lopez-Suarez, and Maria J. Suarez. "The Marginal Fit of CAD/CAM Monolithic Ceramic and Metal-Ceramic Crowns." Journal of Prosthodontics 28, no. 3 (February 2, 2017): 299–304. http://dx.doi.org/10.1111/jopr.12590.

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Ku, Chul-Whoi, Sang-Won Park, and Hong-So Yang. "Comparison of the fracture strengths of metal-ceramic crowns and three ceromer crowns." Journal of Prosthetic Dentistry 88, no. 2 (August 2002): 170–75. http://dx.doi.org/10.1067/mpr.2002.127712.

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Moritz, Tassilo, Dorit Linaschke, and W. Eiselt. "Development of Ceramic Dental Crowns and Bridges Using Electrophoretic Deposition." Key Engineering Materials 314 (July 2006): 207–12. http://dx.doi.org/10.4028/www.scientific.net/kem.314.207.

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In the dental branch much effort is undertaken for production of metal-free ceramic restoration. Because of esthetical aspects and their biocompatibility ceramics are the material of choice. Allergic reactions or toxic tissue damages can be prevented largely by application of ceramic dental products. Zirconia in its tetragonal yttria stabilized polycrystal form (TZP) and alumina toughened zirconia (ATZ) offer highest strength combined with highest toughness. Unfortunately this favourable, outstanding combination of mechanical properties leads to difficulties in conventional hard machining in the sintered state, which is too time- and costconsuming. For this reason, electrophoretic deposition of alumina toughened zirconia powder and TZP powder was used for preparation of metal-free dental crowns and bridges. The electrophoretic deposition process was carried out directly onto the plaster moulds for single crowns, three-unit and four-unit bridges. The electrophoretic deposition process was investigated concerning the deposition rate and the output of dental crowns per volume of ethanolic ceramic suspension. Furthermore, the influence of the amount of dispersing agent on the rheological properties of the ceramic suspensions was investigated.

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RYNIEWICZ, Anna M., Andrzej Ryniewicz, Łukasz Bojko, and Wojciech Ryniewicz. "ANALYSIS OF THE IMPACT OF BIOMATERIAL AND THE TECHNOLOGY OF PROSTHETIC CROWNS MANUFACTURING ON THE CONNECTION WITH VENEERING CERAMICS." Tribologia 293, no. 5 (January 25, 2021): 17–25. http://dx.doi.org/10.5604/01.3001.0014.6954.

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The aim of the study is to identify the endurance parameters of prosthetic crowns veneered with dedicated ceramics on metal, glass-ceramic, and ceramic frameworks. Metal frameworks were made using CAD/CAM milling technology and SLM technology, while the glass-ceramic and ceramic frameworks were produced using only the CAD/CAM milling technology. The research materials are samples replicating the layered structures of prosthetic crowns. The veneering procedure must ensure the adhesion of the ceramics to the loadbearing framework. The tests modelling the conditions of concentrated loads during chewing were carried out using the Instron 3345 testing machine. Determination of microhardness in cross-sections through layered structures of crowns was performed using the HMV Micro Hardness Tester. The comparison of force loading the indenter as a function of penetration depth indicates that the value of the maximum depth depends on the configuration of microhardness of the framework and dentine. The zirconium ceramics ZrO2 (3Y-TZP) – veneered with Elephant Sakura silica ceramics – should be indicated as the most advantageous material composition.

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Fransson, B., G. Øilo, and R. Gjeitanger. "The fit of metal-ceramic crowns, a clinical study." Dental Materials 1, no. 5 (October 1985): 197–99. http://dx.doi.org/10.1016/s0109-5641(85)80019-1.

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Johnson, Glen H., Xavier Lepe, Hai Zhang, and John C. Wataha. "Retention of Metal-Ceramic Crowns With Contemporary Dental Cements." Journal of the American Dental Association 140, no. 9 (September 2009): 1125–36. http://dx.doi.org/10.14219/jada.archive.2009.0340.

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Donovan, Terry, and Jonathan Prince. "An analysis of margin configurations for metal-ceramic crowns." Journal of Prosthetic Dentistry 53, no. 2 (February 1985): 153–57. http://dx.doi.org/10.1016/0022-3913(85)90097-6.

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HENRIQUES, Priscila Alonso, André Hayato SAGUCHI, Fábio Valverde Rodrigues BASTOS NETO, Igor PROKOPOWITSCH, and Angela Toshie ARAKI. "Fracture resistance of metal-ceramic crown copings cemented to two types of intra-radicular posts." Revista de Odontologia da UNESP 47, no. 5 (October 2018): 305–8. http://dx.doi.org/10.1590/1807-2577.09218.

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Abstract Introduction Endodontically treated teeth are more susceptible to root fracture than vital teeth. In order to reduce the risk of fracture, the use of intra-radicular posts and crowns is indicated. However, their own fracture resistance remains unclear. Objective To analyze the behavior of metal-ceramic crown copings cemented to two types of intra-radicular posts under tensile stress. Material and method Sixteen metal-ceramic crown copings cemented with zinc phosphate cement to cast metal posts and cores (group 1, n = 8) or with self-adhesive resin cement to glass-fiber posts rebased with composite resin (group 2, n = 8) were subjected to tensile testing after endodontic treatment and standardized preparation. Failure occurred when the crown coping and/or post-core assembly fractured and/or detached. Result In group 1, after the application of a mean tensile load of 46.83 N, 7 crown copings and metal cores separated as a whole, while in 1 specimen the coping detached from the metal core. In group 2, a mean tensile load of 127.68 N resulted in glass-fiber post fracture, and in 1 case the entire crown-post-core assembly was detached. Tensile strength differed significantly between the two groups (p = 0.0085). Conclusion Our findings suggest that metal-ceramic crown copings cemented with self-adhesive resin cement show strong adhesion to composite resin cores associated with glass-fiber posts, thus providing a safe alternative to the use of cast metal posts and cores.

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Rocha, Cibele Oliveira de Melo, Diogo Longhini, Rodrigo de Paula Pereira, and João Neudenir Arioli Filho. "Influence of Cusp Inclination and Type of Retention on Fracture Load of Implant-Supported Crowns." Brazilian Dental Journal 28, no. 1 (February 2017): 92–96. http://dx.doi.org/10.1590/0103-6440201701342.

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Abstract There are few informations about the influence of cusp inclination on the fracture strength of implant-supported crowns. The study aimed to evaluate the influence of cusp inclination and retention type on fracture load in implant-supported metal-ceramic single crowns. Sixty crowns were made, classified as cemented and screw-retained with screw access hole (SAH) sealed or not. Standard (33°) and reduced (20°) cusp inclinations were tested for each group (n=10). To support crowns of a mandibular second molar, analogs of external hexagon implants 5.0 were used. The fracture load was measured in a universal testing machine EMIC DL2000 (10 kN load cell; 0.5 mm/min). Two-way ANOVA (retention and cusp inclination) followed by post hoc Tukey’s honest significant difference test was used for the statistical analyses (a=0.05). Crowns with reduced cusp inclination exhibited significantly higher fracture load (p<0.01) than crowns with standard cusp inclination. Cemented crowns showed significantly higher fracture load (p<0.01) than screw-retained crowns. The interaction among these factors was not significant (p>0.05) for the fracture load. The sealing of SAH did not influence the fracture load of screw-retained crowns (p>0.05). In conclusion, fracture load of implant-supported metal-ceramic crowns was influenced by retention and cusp inclination, and there was no influence of the sealing of SAH.

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Parunov, Vitaly A., I. Yu Lebedenko, A. A. Druzhinin, A. Yu Yakovchuk, and E. A. Morokov. "DETERMINATION OF MINIMUM PERMISSIBLE PARAMETERS OF METAL-CERAMIC BRIDGES DENTURES FROM A NEW RUSSIAN ALLOY BASED ON PALLADIUM PALLADENT UNI BY MATHEMATICAL MODELING." Russian Journal of Dentistry 22, no. 2 (April 15, 2018): 76–78. http://dx.doi.org/10.18821/1728-2802-2018-22-1-76-78.

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The article shows the results of physical and mechanical tests of samples of the alloy palladent UNI based on palladium for metal-ceramic dentures. The values of these results were used for mathematical modeling by finite element method of metal-ceramic prosthesis frames. Determined the minimum allowable size of the connection supporting crowns and intermediate parts.

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Maksyukov, S. Yu, and M. K. Lemeshko. "Comparative analysis of the effectiveness of indirect restorations of anterior." Russian Journal of Dentistry 21, no. 1 (February 15, 2017): 26–29. http://dx.doi.org/10.18821/1728-28022017;21(1):26-29.

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A comparative analysis of the effectiveness of indirect restorations of anterior in 35 patients. Studied the objective criteria of the quality of dental treatment and quality of life Oral Health Impact Profile-OHIP-14RU in the period up to 1 year. It is established that indirect restorations are highly resistant according to the criteria of form, color, roughness. In addition, at a high level in the medium term, retain the integrity and conformance of the design. Among the indications for indirect restorations metal-ceramic crowns-dimensional structure or texture of the tooth were observed in 31% ofpatients, multiple fillings, defects of shape, and disposition - 41, 17 and 11% respectively. When using metal crowns, on the stage of the preparatory treatment shows deponirovanie 41,1% of the teeth. In patients who underwent restorations in the front group were made metal-ceramic crowns, at the dispositions ofpulpless 80% of the teeth, just the restoration of the 11th, 21st, 31st and 41st teeth was performed in 58,8%.

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Peng, Min, Wei-Jie Zhao, Mandana Hosseini, Wen-Juan Zhou, Ting Xiao, and Jun-Lan Chuan. "Influence of Restorative Materials on Color of Implant-Supported Single Crowns in Esthetic Zone: A Spectrophotometric Evaluation." BioMed Research International 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/5034358.

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Restorations of 98 implant-supported single crowns in anterior maxillary area were divided into 5 groups: zirconia abutment, titanium abutment, and gold/gold hue abutment with zirconia coping, respectively, and titanium abutment with metal coping as well as gold/gold hue abutment with metal coping. A reflectance spectrophotometer was used to evaluate the color difference between the implant crowns and contralateral/neighboring teeth, as well as the color difference between the peri-implant soft tissue and the natural marginal mucosa. The mucosal discoloration score was used for subjective evaluation of the esthetic outcome of soft tissue around implant-supported single crowns in the anterior zone, and the crown color match score was used for subjective evaluation of the esthetic outcome of implant-supported restoration. ANOVA analysis was used to compare the differences among groups and Spearman correlation was used to test the relationships. A gold/gold hue abutment with zirconia coping was the best choice for an esthetic crown and the all-ceramic combination was the best for peri-implant soft tissue. Significant correlation was found between the spectrophotometric color difference of peri-implant soft tissue and mucosal discoloration score, while no significant correlation was found between the total spectrophotometric color difference of implant crown and crown color match score.

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George, Vinu T. "Management of Failed Long-span Single-piece Fixed Prosthesis with Metal—Ceramic Crowns and Cantilever Bridge with Predictable Esthetic Outcome." World Journal of Dentistry 7, no. 3 (2016): 162–66. http://dx.doi.org/10.5005/jp-journals-10015-1387.

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ABSTRACT Although there have been a lot of advances in the field of esthetic and cosmetic restorative dentistry, metal—ceramic restorations stand apart in the race to achieve superior esthetics with its strong points of strength and accuracy of cast metal and esthetics of porcelain. To achieve superior esthetic restorations operators are compelled to narrow down their search to all ceramic restorations which are highly expensive. At most times, its use is not rightly justified. A case of a 53-year-old female patient, who reported to the Department of Prosthodontics and Crown 8 Bridge, Manipal College of Dental Sciences, Manipal, is presented here where simple and economic restorative techniques and principles are undertaken to achieve predicable esthetic results. How to cite this article George VT. Management of Failed Long-span Single-piece Fixed Prosthesis with Metal—Ceramic Crowns and Cantilever Bridge with Predictable Esthetic Outcome. World J Dent 2016;7(3):162-166.

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Rammelsberg, Peter, Justo Lorenzo Bermejo, Stefanie Kappel, André Meyer, and Andreas Zenthöfer. "Long-term performance of implant-supported metal–ceramic and all-ceramic single crowns." Journal of Prosthodontic Research 64, no. 3 (July 2020): 332–39. http://dx.doi.org/10.1016/j.jpor.2019.09.006.

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Mohammed, Huda A., and Omar S. Ali. "Three-Dimensional Surface Evaluation and Shear Bond Strength of Three Pre-treatment E-max Surfaces for Metal and Ceramic Orthodontic Brackets." Polytechnic Journal 10, no. 2 (December 30, 2020): 113–18. http://dx.doi.org/10.25156/ptj.v10n2y2020.pp113-118.

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3D evaluation and shear bond strength (SBS) for metal and ceramic brackets after three pre-treatment surfaces of lithium disilicate (LD) crowns. Sixty lithium disilicate (LD) crowns were fabricated in laboratory according to manufacturer instruction and then divided into six groups (three groups for metal brackets and three groups for ceramic one). The 1st group for both was treated with round diamond bur, the 2nd one by hydrofluoric acid (HFA) 9.0%, and the 3rd group by laser (Er,Cr:YSGG). All treated surfaces were examined by laser profilometer and scan electron microscope. The Scotchbond Universal Adhesive and Transbond XT were used for bracketing procedure for metal and ceramic bracket (central incisor, 0,022” slot). Universal testing machine was used for shear bond. A crosshead speed of 1 mm/min was used, and the maximum load necessary to deboned the bracket will be recorded. HFA treated surfaces gave a highest SBS for both metal and ceramic brackets, then laser and finally the bur. The lowest roughness parameter Sa (arithmetical mean height) was in bur, both laser and HFA gave no significant differences. The HFA gave a highest Sz (maximum height) and Spc (arithmetic mean peak curvature) value. To increase the shear bond strength, the HFA is one of the best methods for roughness although the laser gave nearby roughness parameters. Ceramic brackets gave higher SBS than metal one with all pre-treatment procedures.

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Agustín-Panadero, Rubén, Raquel León Martínez, María Fernanda Solá-Ruíz, Antonio Fons-Font, Georgina García Engra, and Lucía Fernández-Estevan. "Are Metal-Free Monolithic Crowns the Present of Prosthesis? Study of Mechanical Behaviour." Materials 12, no. 22 (November 7, 2019): 3663. http://dx.doi.org/10.3390/ma12223663.

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Purpose: To analyze in vitro the mechanical behavior of five types of complete coverage crowns fabricated from different materials. Materials and methods: Seventy-five full coverage crowns were divided into five groups according to material: Group I, metal core with feldspathic ceramic covering (MC- control group); Group II, zirconia core with feldspathic ceramic covering (CZ); Group III, tetragonal monolithic zirconia (TMZ); Group IV, cubic monolithic zirconia (CMZ); Group V, high molecular weight polymethyl methacrylate (PMMAG) doped with graphene nanoparticles. All crowns underwent in vitro fatiguing by dynamic loading in wet conditions to simulate the masticatory forces to which prosthodontic materials are subject in the oral medium. Lastly, fracture resistance was evaluated by static compression testing. Results: The fracture resistance values obtained were as follows: Group MC, 2443.6 ± 238.6 N; Group CZ, 2095.4 ± 329.2 N; Group TMZ, 2494.6 ± 236.6 N; Group CMZ, 1523.6 ± 325.2 N; and Group PMMAG, 1708.9 ± 386.6 N. Group MC presented higher strength with statistically significant differences in comparison with Groups CZ (P = 0.002), CMZ (P < 0.001), and PMMAG (P < 0.001). Weibull distribution showed less probability of cumulative biomechanical failure in Groups MC and TMZ. Conclusions: Metal-ceramic and tetragonal zirconia showed high fracture resistance, while cubic zirconia and PMMA doped with graphene nanoparticles obtained lower values.

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Marghalani, Thamer Y. "Convergence angles of metal ceramic crowns prepared by dental students." Journal of Prosthetic Dentistry 112, no. 5 (November 2014): 1250–56. http://dx.doi.org/10.1016/j.prosdent.2014.03.024.

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Ozcan, Mutlu, Jeroen M. van der Sleen, Hemmo Kurunmaki, and Pekka K. Vallittu. "Comparison of Repair Methods for Ceramic-Fused-to-Metal Crowns." Journal of Prosthodontics 15, no. 5 (September 2006): 283–88. http://dx.doi.org/10.1111/j.1532-849x.2006.00124.x.

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Garhnayak, Mirna, Angurbala Dhal, Lokanath Garhnayak, Aswini K. Kar, and Thatapudi Shankar. "Comparison of Hypersensitivity in Metal Ceramic Crowns cemented with Zinc Phosphate and Self-adhesive Resin: A Prospective Study." Journal of Contemporary Dental Practice 18, no. 10 (2017): 923–26. http://dx.doi.org/10.5005/jp-journals-10024-2150.

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ABSTRACT Background Luting agents used to fix artificial prostheses, such as fixed partial denture (FPD) to tooth are basically viscous in nature and show chemical reaction for fixation. Postcementation hypersensitivity is a frequent complaint of patients. The present study was conducted to compare postcementation hypersensitivity with zinc phosphate and self-adhesive resin in complete coverage crown. Materials and methods This study included 30 patients in which 60 porcelein fused to metal crowns was placed. Two metal crowns were placed in each patient in nonantagonistic contralateral quadrants. First crown was cemented with zinc phosphate cement, while the other was cemented with self-adhesive resin. Hypersensitivity was evaluated by visual analog scale (VAS) score and by clinical test. For clinical evaluation of sensitivity, hot and cold water was applied to the cervical margin of restoration for 5 seconds and response was recorded. Results This study consisted of 30 patients in which 60 crowns were given. There was no statistical difference in VAS score of mastication in zinc phosphate cement recorded at baseline, 1 week, 4 weeks, 6 months, 1 year, and 2 years (p > 0.05). Cold response also did not show a significant difference at six time points. Warm response showed slight decrease in subsequent time points but was nonsignificant (p > 0.05). Similarly, with selfadhesive resin cement, VAS score during mastication, hot and cold response was statistically nonsignificant (p > 0.05). Conclusion Postcementation hypersensitivity is a frequent complaint that patient may experience. However, we found no statistically significant difference in both cements tested. Clinical significance Postcementation hypersensitivity is an unpleasant sensation experienced by patients. This may affect the success of any prosthesis. Thus, selection of luting agent for cementation plays an important role to eliminate this symptom. How to cite this article Shankar T, Garhnayak M, Garhnayak L, Dhal A, Kar AK. Comparison of Hypersensitivity in Metal Ceramic Crowns cemented with Zinc Phosphate and Selfadhesive Resin: A Prospective Study. J Contemp Dent Pract 2017;18(10):923-926.

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Journal articles on the topic 'Metal-ceramic crowns'

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