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Journal articles on the topic 'Ceramics Conservation and restoration'
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1
Smith, Sandra, Susan Buys, and Victoria Oakley. "The Conservation and Restoration of Ceramics." Studies in Conservation 40, no. 1 (February 1995): 69. http://dx.doi.org/10.2307/1506613.
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Poonia, Lalita, Deepak Raisingani, Prachi Mital, and Neha Mittal. "Conserving a tooth in esthetic way - A case report." UNIVERSITY JOURNAL OF DENTAL SCIENCES 6, no. 3 (January 12, 2021): 120–23. http://dx.doi.org/10.21276/ujds.2020.6.3.20.
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Esthetic treatment is the main concern for everyone in today’s world. Clinicians are in search of a durable and tooth colored restorative material. All ceramics with high strength are better alternative to composite, amalgam and gold for posterior tooth restoration. Tooth-colored restorations made from composite resin or ceramic has solved many of the esthetic concerns. This case report presented a durable and more conservative esthetic treatment for a broken tooth with bruxZir inlay.
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Dionisio, Giulia, and Daniela Puzio. "Restoration in archaeological university courses: practical ceramic conservation laboratory in graduate school in archaeology – UNIFI." Studies in Digital Heritage 1, no. 2 (December 14, 2017): 682–91. http://dx.doi.org/10.14434/sdh.v1i2.23191.
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In theoretical Archaeological University courses it is often impossible to act directly on artifacts owing to the lack of products and working spaces and the poor availability of suitable materials. However, the archaeologist’s work is mainly carried out in the field and in most cases requires direct conservative procedures on archaeological ceramics to allow their study and documentation. As such, the lack of practical restoration laboratories within the university curricula represents a serious gap in the training of future professional archaeologists. In 2016 a practical laboratory of ceramic conservation was established for the first time inside the Graduate School of Archaeology of the University of Florence. The goal was to give students the opportunity to put into practice the theoretical conservation lessons learned in the classroom. Trainees were put to work directly both on archaeological and modern ceramic materials, so as to learn which materials to use and how to make all relevant operations for the cultural heritage conservation (cleaning, sticking and integration of missing parts). All the operations carried out during the course followed the same procedures currently required on archaeological ceramics by the Superintendency for Archaeological Heritage of Tuscany. All the steps taken in the laboratory are similar to those implemented on a Mycenaean stirrup jar reported in the poster as an example.
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Tonetto, Mateus Rodrigues, Shelon Cristina Souza Pinto, Alvaro Henrique Borges, José Roberto Cury Saad, Luiz Rafael Calixto, Matheus Coelho Bandeca, Thiago Soares Porto, and Kamila de Figueiredo Pereira. "Interactions between Restorative Dentistry and Periodontics: Preparation and Cementation of an Onlay in Empress (Part III)." World Journal of Dentistry 5, no. 2 (2014): 138–42. http://dx.doi.org/10.5005/jp-journals-10015-1275.
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ABSTRACT The relentless pursuit by cosmetic dentistry brought the evolution of materials ceramics. The IPS-Empress system was upgrading of indirect restorations based on lithium disilicate. The ceramic restoration posterior allow a new esthetic approach due to its translucency and resistance without any weakening of the remaining dental element, being an option more conservative when compared to conventional prosthetic restorations. How to cite this article Bandéca MC, Pinto SCS, Tonetto MR, de Figueiredo Pereira K, Porto TS, Calixto LR, Borges AH, Saad JRC. Interactions between Restorative Dentistry and Periodontics: Preparation and Cementation of an Onlay in Empress (Part III). World J Dent 2014;5(2):138-142.
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Revenok, Natalia. "SCIENTIFIC RESTORATION OF WORKS OF DECORATIVE AND APPLIED ART IN THE SYSTEM OF HIGHER ART EDUCATION." Research and methodological works of the National Academy of Visual Arts and Architecture, no. 30 (December 9, 2021): 92–106. http://dx.doi.org/10.33838/naoma.30.2021.92-106.
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Abstract. The article is devoted to the issues of scientific restoration of works of decorative and applied art in the system of art education at the National Academy of Fine Arts and Architecture. The processes of formation and improvement of the experience of the artist-restorer for the preservation of historical and cultural monuments are defined. The importance of solving the cultural and professional development of the future artist-restorer in the field of restoration of works of decorative and applied art is emphasized. The topic studied by the author raises a number of issues of the methodology of studying works of decorative and applied arts in the research work of future artists-restorers. The purpose of the study is to develop and substantiate basic theoretical knowledge in the field of research, restoration, conservation and storage of works of decorative and applied arts from metal, ceramics and organic materials. Training of restoration specialists is carried out in various educational and scientific institutions of Ukraine. At the present stage of development of scientific restoration, this industry needs innovative approaches and updating of old methods. Thus, at the National Academy of Fine Arts and Architecture you can get a specialty artist-restorer of monumental painting, artist-restorer of sculptures and decorative arts from metal, ceramics, organic materials (fabrics, leather and bone). Restoration occupies the most important place in museum work and combines a set of knowledge and skills that provide storage of works of art made of metal, ceramics and organic materials. Disciplines on the restoration of sculpture and works of decorative and applied art are part of the training of specialists in the specialty «Restoration of works of art» within the acquisition of practical skills in research, restoration, conservation and storage. Training of future artists-restorers in the system of higher professional education taking into account modern requirements of conservation and restoration is based on such principles as scientific, connection of theory with practice should be carried out on authentic monuments — museum exhibits that promotes formation of professional competences, acquisition of professional experience, responsible attitude to historical and cultural monuments. The obtained results deepen the idea of research methods, restoration and conservation of works of decorative and applied arts from metal, ceramics and organic materials. Theoretical provisions are important at the problem-theoretical level, because the training of restorers requires a strong scientific and methodological base.
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Anwarullah, Anupreeta, Ravi Kumar Konagala, Murali Krishna Raju, Amara Swapna Lingam, and Lakshman Varma U. "Endocrown - The Realm of Post-Free Endodontic Restorations." Journal of Evolution of Medical and Dental Sciences 10, no. 16 (April 19, 2021): 1187–90. http://dx.doi.org/10.14260/jemds/2021/254.
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With increased dental awareness, there has been a growing trend in patients who are opting for teeth retention, so post-endodontic restorations play a significant role in dictating restoration longevity. However, till date restoration of root canal treated teeth is still controversial. Root canal treated teeth often suffer from extensive loss of tooth structure because of access cavity preparation, caries removal, replacement of restoration and trauma.1 Traditionally the restorative material of choice for an endodontically treated molar would be post and core followed by metal / ceramic crowns. However, studies have shown that these intra-canal posts may increase risk, of undermining the residual tooth structure, root perforation and catastrophic failures.2 With adhesive strategies, there has been a paradigm shift towards post-less restorations and utilisation of pulp chamber as an extension, thus integrating the crown and core as a single unit or monobloc. 2,3 This was the concept of the endocrown technique. 3 Bindle and Mormann first, delineated the use of porcelain adhesive endodontic crowns.4 Endocrowns are more practical, conservative, aesthetic, simple to fabricate, economical, less time consuming and allows favourable distribution of masticatory stresses. Most studies on endocrowns showed comparable or somewhat superior results to other conventional treatments for endodontically treated teeth (ETT). However, the available literature is based largely on the use of ceramic endocrowns. 2-4 It was observed that data pertaining to endocrown fabrication with other indirect restorative materials is still limited, and the choice is still unclear.Indirect composites show enhanced mechanical properties, creation of ideal contacts and contours, favourable wear, aesthetics and can serve as an economical alternative to ceramics.5 Hence, this paper attempts to present a case report of functional and aesthetic rehabilitation of an endodontically treated molar with an endocrown restoration utilising indirect composite (SR Adoro System).
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Morkūnaitė, Giedrė, Rimantas Ožiūnas, Vytautas Čeplauskas, Simona Tučkutė, Jurgita Laurikaitienė, and Diana Adlienė. "Surface Morphology Changes of Bleached Dental Ceramics." Applied Sciences 12, no. 9 (April 30, 2022): 4557. http://dx.doi.org/10.3390/app12094557.
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Tooth whitening is one of the most conservative procedures for increasing the aesthetics of patients, but the effect of bleaching on ceramic restorations has not been extensively studied. In this study, the bleaching effect on three dental restoration materials (polished/glazed lithium disilicate glass ceramic, leucite reinforced glass ceramic and zirconium dioxide ceramic) has been investigated in terms of surface roughness changes of the exposed samples. Philips Zoom NiteWhite 16% carbamide peroxide, Philips Zoom 6% hydrogen peroxide with following LED illumination and Pola Office 6% hydrogen peroxide have been used for ceramic bleaching. The experimental investigation and performed statistical analysis revealed that the highest surface roughness changes of all investigated ceramics were caused by the hydrogen peroxide and the lowest by carbamide peroxide. These findings correlated well with the colour changes observed in the same bleached dental ceramic samples indicating potential of carbamide peroxide as the most prospective bleaching agent.
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Strahan, Donna K., and Ann Boulton. "CHINESE CERAMIC QUADRUPEDS: CONSTRUCTION AND RESTORATION." Studies in Conservation 33, sup1 (January 1988): 149–54. http://dx.doi.org/10.1179/sic.1988.33.s1.035.
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Petrovic, Snezana, Vojo Jovanov, Slavica Vujovic, Jonjaua Ranogajec, and Emilija Fidancevska. "Historical materials from the medieval fortress Bac." Processing and Application of Ceramics 1, no. 1-2 (2007): 75–80. http://dx.doi.org/10.2298/pac0702075p.
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Conservation and restoration of cultural heritage are the objects of great interest worldwide. For setting the correct methodology for the procedures of the restoration it is very important to have the right information about the state of the object and the characteristics of the original materials. The basis of our examinations were clay products (samples of bricks, terracotta and clay roof tile) from the middle ages, the fortress in Bac. The following methods were used: x-ray diffraction, classic chemical analysis, SEM-EDS, Hg-porosimetry and dilatometry. Based on the used methods, mineral composition, temperature and regime of firing and textural properties of the examined materials were determined. The degree of destruction of examined materials was also identified, in order to find compatible materials for future techniques of conservation and restoration.
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Dingari, Mamatha, Sujesh M, Ravi Kumar C, Rajanikanth A, Chalapathi Rao Duggineni, and Harilal G. "A comprehensive review on bonding between monolithic ceramics and tooth structure with different adhesive agents." International Journal of Dental Materials 04, no. 02 (2022): 46–50. http://dx.doi.org/10.37983/ijdm.2022.4205.
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Reliable bonding between the prepared tooth and monolithic ceramics can be achieved by various luting agents available on the market. The selection of luting agent and cementation technique plays an important role in the success of the restoration. With the advent of resin-based adhesive systems as luting agents, clinicians' perspectives have changed to a more conservative approach. Recent systems, chemically adhere athe crowns to the prepared tooth structure showing higher bond strength. To reach the aesthetic demands of the patients, all-ceramic restorations were considered over metal-ceramic crowns. Few all-ceramic crowns are brittle, the strength is dependent on the chemical structure and method of fabrication. While some all-ceramic restorations gain strength after cementation. Thus, the choice of luting agent used in cementing all-ceramic crowns is crucial. Even though many luting agents are being introduced no single luting agent fulfilled all the requirements. Among them, adhesive cements showed greater bond strength and enhanced the retention of minimal preparation, which are less retentive. Traditional non-adhesive agents can be used in retentive preparations that bond through mechanical means rather than the chemical bond seen in newer adhesive cements. Also, surface treatments of zirconia showed greater bond strengths irrespective of the luting agent being used. These include air abrasion, acid etching, applying silane couplers, and primers that increase the surface area for adhesion. The use of all-ceramic restorations, the need for surface treatments, types of surface treatments, adhesion and adhesive agents, and evidence from current in vitroresearch on monolithic ceramics and tooth adhesion were all discussed in this review.
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Dingari, Mamatha, Sujesh M, Ravi Kumar C, Rajanikanth A, Chalapathi Rao Duggineni, and Harilal G. "A comprehensive review on bonding between monolithic ceramics and tooth structure with different adhesive agents." International Journal of Dental Materials 04, no. 02 (2022): 46–50. http://dx.doi.org/10.37983/ijdm.2022.4205.
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Reliable bonding between the prepared tooth and monolithic ceramics can be achieved by various luting agents available on the market. The selection of luting agent and cementation technique plays an important role in the success of the restoration. With the advent of resin-based adhesive systems as luting agents, clinicians' perspectives have changed to a more conservative approach. Recent systems, chemically adhere athe crowns to the prepared tooth structure showing higher bond strength. To reach the aesthetic demands of the patients, all-ceramic restorations were considered over metal-ceramic crowns. Few all-ceramic crowns are brittle, the strength is dependent on the chemical structure and method of fabrication. While some all-ceramic restorations gain strength after cementation. Thus, the choice of luting agent used in cementing all-ceramic crowns is crucial. Even though many luting agents are being introduced no single luting agent fulfilled all the requirements. Among them, adhesive cements showed greater bond strength and enhanced the retention of minimal preparation, which are less retentive. Traditional non-adhesive agents can be used in retentive preparations that bond through mechanical means rather than the chemical bond seen in newer adhesive cements. Also, surface treatments of zirconia showed greater bond strengths irrespective of the luting agent being used. These include air abrasion, acid etching, applying silane couplers, and primers that increase the surface area for adhesion. The use of all-ceramic restorations, the need for surface treatments, types of surface treatments, adhesion and adhesive agents, and evidence from current in vitroresearch on monolithic ceramics and tooth adhesion were all discussed in this review.
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Ristic, Slavica, Suzana Polic, Bojana Radojkovic, and Joakim Striber. "Analysis of ceramics surface modification induced by pulsed laser treatment." Processing and Application of Ceramics 8, no. 1 (2014): 15–23. http://dx.doi.org/10.2298/pac1401015r.
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This paper presents the effects of laser light irradiation on the surface of ceramics dating from archaeological site Stubline (Obrenovac, Belgrade), Serbia. Two different pulsed lasers: TEA CO2 (10.6 ?m wavelength, pulse duration tp = 100 ns) and Nd:YAG (wavelengths 1064 nm and 532 nm, tp = 150 ps) have been used for surfaces treatment. Laser irradiation fluence was in the range of 1-20 J/cm2. Ceramics surface modifications induced by pulsed laser treatment were examined by scanning electron microscope, SEM, and the composition with energy dispersive X-ray, EDX, analysis. The tests were performed in order to obtain as much as possible information about the appropriate choice of materials and techniques for the further conservation and restoration of these items. The second objective was to determine the surface modifications induced by pulsed laser treatment above damage threshold (a safe cleaning laser fluence), as an important parameter in the use of lasers for the cleaning of cultural ceramic items.
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Loureiro, Leonor, Ricardo Triães, and Cláudia Falcão. "Educational tools for involving higher degree students within the Project Creative Conservation." New Trends and Issues Proceedings on Humanities and Social Sciences 2, no. 7 (January 27, 2016): 32–40. http://dx.doi.org/10.18844/prosoc.v2i7.1177.
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Background: The Project Creative Conservation was developed at the Conservation and Restoration Laboratory / Polytechnic Institute of Tomar (IPT) as a form to recover, preserve and show in a new way industrial remnants and derelicts, complying with well-defined criteria for collection and selection of those fragments. As a new concept, it needed to be experimented, so students were involved in its practice, which enabled theory demonstrations and maintained a dynamic university learning atmosphere. Purpose: This paper presents the challenges posed to three Conservation and Restoration teachers: different ways to explain new and controversial information, engaging students for the Creative Conservation concept, developing practical extra work, learning and improving hands-on skills, and to practice team-work within a Conservation Laboratory and a Museum environment. Methods: A series of three different workshops were designed as learning tools to allow students to develop conservation skills, discuss problem solving and practice “out of the box†thinking, under the Project Creative Conservation, within the specialties of ceramics, tiles, metal, plastics and paper remnants preservation. It was also provided the chance to create different exhibition methods, installation and exhibition display. Results: A good percentage of students were enthusiastic and complied with the conservation challenges posed by teachers and by remnants themselves. The fragments were properly preserved and differently displayed in exhibitions. Conclusions: The IPT conservation teacher’s competencies and enthusiasm towards teaching a different concept within a practical frame enabled students to broad their view in the conservation field and widen the classical approach to conservation and restoration.
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Demus, Olena, Oleh Rybchynskyi, and Viktoria Kochubei. "FEATURES OF MUSEUM RESTORATION OF THE CHURCH FLOOR CERAMIC TILES OF THE 12th CENTURY FROM TOWN BUSK." Current Issues in Research, Conservation and Restoration of Historic Fortifications 16, no. 2022 (2022): 101–9. http://dx.doi.org/10.23939/fortifications2022.16.101.
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For the first time in the article the analysis and systematization of twin ceramic tiles of the XII century from the city of Busk is performed. Metric characteristics, technology of tile execution and its watering, installation technology are determined. A restoration program has been developed and work on the monument has been practically implemented. During the chemical-technological studies of two samples it was found that the mineral composition of lime-sand solution consists of quartz sand, slaked lime, organic additives and the mineral masicot, which corresponds to the chemical formula PbO, and lead oxide Pb2O. Thus, during the princely era to create a strong solution add protein, resulting in the formation of casein, over time in this solution could function organisms (which would feed on microcasein), so to prevent the formation of microorganisms added antiseptic - lead oxide. Analysis of brown ceramic glaze showed that this color is formed by mixing the tops of oxide forms of calcium and pork, as well as quartz sand, clay raw materials and feldspar. Yellow ceramic glaze was the result of the presence of a significant amount of lead oxide in the charge. Green ceramic glaze was formed due to the presence of a copper element in the silicate matrix.Fluorescent glow is characteristic of yellow and greenish coating. This effect is achieved due to the addition of a mixture of wood and bone ash (phosphorus). Yellow-green ceramic glaze is stronger than brown.. This was reflected in the state of preservation of the decorative surface of the tiles, and is also a consequence of the fact that the yellowish ceramic glaze was more homogeneous due to the lead content. In contrast, brown ceramic glaze was less robust due to the additional introduction of Fe2O3 oxide into the charge. The program of restoration of finishing tiles consists of several stages: photo-fixation of the monument before restoration; execution of measurement drawings and cartograms of losses; part of the ceramic tiles that were in a critically unstable state was strengthen the solution KSE-100; performing samples for chemical analysis; cleaning of the ceramic tiles from pollution by means of compresses of distilled water and a cotton swab; cleaning ceramics from crosslinked organic contaminants by steam jet method; structural strengthening of ceramics with silicon-organic solution KSE-300; injection of cracks with mineral solution to prevent further destruction of the monument; lassing additions; elaboration of a reverse arrangement method of arranging floor tiles. The process of structural strengthening lasted three times in two weeks. After total impregnation of the tiles with silicon-organic solution, they were covered with a film to allow deeper penetration of the substance and slow evaporation. This method allowed to evenly impregnate the ceramic tiles and prevent the formation of zones of film stress on the surface of the works. The main axis of the restoration program was the stabilization of the archeological site from further destruction. All found ceramic tiles had significant damage and cracks, and this is a source of destruction of the object. Therefore, during the restoration it was decided to inject the cracks with the author's mineral solution. The result of conservation measures - managed to stabilize the monument, stop its destruction and give the object an expositional appearance. Ceramic tiles of the church floor are a valuable Ukrainian cultural heritage of the XII century. Their technology of execution and installation testifies to a high level of handicraft skill. The importance of ceramic floor tiles for Ukrainian science and art has led to a frugal approach to conservation, adherence to the vector of quality stabilization of ceramic and irrigated materials. The developed concept of museum arrangement of ceramic tiles will allow to continue historical and chemical-technological research.
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Zindovic, Natasa, Ljiljana Damjanovic, Ivanka Holclajtner-Antunovic, Ubavka Mioc, and Danica Bajuk-Bogdanovic. "Investigation of medieval ceramics from Ras by physicochemical methods." Chemical Industry 62, no. 3 (2008): 138–42. http://dx.doi.org/10.2298/hemind0803138z.
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Although early medieval Serbian ceramic is well described by the archeologists and historians, knowledge of the Balkan ceramic production is still limited. Archaeometric study of ceramics provenance, technology of preparation and used pigments as well as influence of neighboring countries and specific characteristics of different workshops has never been performed so far. The detailed knowledge of the micro-chemical and micro-structural nature of an archaeological artifact is critical in finding solutions to problems of restoration, conservation, dating and authentication in the art world. In this work we present results of systematic investigation of pottery shards from archeological site Ras. The term Ras, which signifies both the fortress and the region encompassing the upper course of Raska River, used to be the center of the medieval Serbian state. Both the ceramic body and the polychromatic glaze of the artifacts were studied by a multianalitical approach combining optical microscopy (OM), FT-IR spectroscopy and X-ray fluorescence (XRF). Mineralogical composition of pottery shards has been determined combining results obtained by FT-IR spectroscopy, after deconvolution of the spectra, and XRPD analysis. Firing temperature has been estimated based on the mineralogical composition and positions of Si-O stretching (-1000 cm-1) and banding (-460 cm-1) vibrations. Investigated samples have been classified into two groups based on the mineralogical composition, cross sections and firing temperature. Larger group consists of samples of fine-grained, homogeneous ceramics with firing temperatures bellow 800 ?C which indicates imported products. Second, smaller group consists of inhomogeneous ceramics with firing temperatures between 850 and 900 ?C produced in the domestic workshops. The obtained results will be used to build up a national database for the compositions of bodies, glazes and pigments.
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Marrocchino, Elena, Maria Grazia Paletta, and Chiara Telloli. "Microanalytical Determinations to Distinguish Maiolica and Mezza Majolica Ceramics from Faenza (Emilia-Romagna Region, Italy)." Heritage 5, no. 4 (November 17, 2022): 3515–29. http://dx.doi.org/10.3390/heritage5040182.
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Post-Renaissance ceramics (XVI–XIX) obtained in the Emilia Romagna region (north of Italy) demonstrate the difficulty in correctly identifying two different main types of artifacts: (i) enamel terracotta (or majolica) and (ii) glazed engobed terracotta (or mezza-majolica). This problem arises from the fact that the two different artifacts have the same shape, mixture, and even the same decoration in terms of color and style. Based only on macroscopic observation, the distinction between majolica and mezza-majolica could be problematic. This study aims to propose an immediate identification of the finds by diagnostic investigations to achieve identification of the type of coating applied. Different kinds of archeological finds were collected during a restoration of an important building in the city center of Faenza, Italy, and were analyzed by optical transmitted light polarized microscopy on thin sections, scanning electron microscope (SEM-EDS), and colorimetry analysis. The results identified two types of clayey material; one was Fe enriched carbonate clay and the other had Fe enriched non carbonate clay used in the production of the ceramic artifact. The analysis also distinguishes the different techniques by which the artifacts were produced, either by single firing or by double firing.
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Wang, Enyuan, Yingei Xiong, Yibing Zhu, Jingwei Wu, Yuwu Gong, and Zhang Licheng. "Petrographic Analysis of Ancient High-Temperature Ceramic Glazes and Inorganic Restoration Materials." Studies in Conservation 67, no. 3 (December 13, 2021): 176–85. http://dx.doi.org/10.1080/00393630.2021.1997022.
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Aura-Castro, Elvira, Carmen Díaz-Marín, Xavier Mas-Barberà, Miguel Sánchez, and Eduardo Vendrell Vidal. "Characterization of 3d printing filaments applied in restoration of sensitive archaeological objects using rapid prototyping." Rapid Prototyping Journal 27, no. 4 (March 29, 2021): 645–57. http://dx.doi.org/10.1108/rpj-06-2019-0153.
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Purpose The purpose of this paper is to characterize three-dimensional (3D) printing filaments commonly used in fused deposition modeling (FDM) to determine their viability for restoration and conservation treatments. Design/methodology/approach Eight current filaments for FDM from six polymeric materials have been characterized to determine their suitability for restoration and conservation treatments. For testing these filaments, specimens are printed with acrylonitrile-butadiene-styrene; polylactic acid; polylactic acid with CaCO3 (E.P.); polyethylene terephthalate glycol; polypropylene; and high-impact polystyrene. Suitability of a filament was verified using the Oddy test by detecting the action of volatile pollutants released from the filaments. The morphological and color changes were observed after allowing them to degrade under the exposure of UV radiation. The samples were then analyzed using Fourier-transform infrared spectroscopy. In addition, gas chromatography-mass spectroscopy technique was applied to complete the characterization of the printed filaments. Findings Materials investigated are suitable for restoration purposes ensuring long-term stability. Rapid prototyping using FDM is appropriate for restoring sensitive archaeological objects allowing reconstruction of parts and decreasing risk while manipulating delicate artifacts. Originality/value Rapid prototyping using FDM was chosen for the restoration of a fragile and sensitive archaeological glass bowl from Manises Ceramic Museum.
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Norris, Dana, and Oliver Watson. "Illuminating the Imperceptible, Researching Mina’i Ceramics with Digital Imaging Techniques." Journal of Imaging 7, no. 11 (November 8, 2021): 233. http://dx.doi.org/10.3390/jimaging7110233.
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Mina’i ceramics dating to the late 12th and early 13th century made in the Kashan region of Iran represent a novel period of overglaze enamelling technology in ceramic history. New colours were used to produce stylistically attractive and dynamic polychrome motifs. Due to their archaeological context, and popularity in the art market since the mid-20th century, these objects often have complex conditions involving reconstruction and overpainting. The aesthetic and technological significance of these pieces warrants further study, but in practice, removing restorations can lead to structural destabilisation, requiring time-consuming and potentially unplanned for conservation treatment. To determine if it is possible to gain useful information from the study of these artworks without disturbing existing restorations, a group of objects were drawn from the Sarikhani and Ashmolean Museum of Art and Archaeology collections. The objective of this project was twofold, first to assess the merits of the imaging techniques for understanding condition, and second to propose a protocol for imaging with the aim of encouraging collaborative projects with international partners. The techniques used in this study include digital photography under visible and ultraviolet light, infrared reflectography, and radiography. The results show that important information invisible to the naked eye can be obtained about the decorative surfaces, using ultraviolet light and infrared reflectography. Digital radiography proved to be equally effective when studying the condition of the ceramic body. The results of this project were used to produce guidance on these techniques as a collaborative documentation package for the study of Mina’i ceramics.
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May, JT. "Conservative Anterior Partial Coverage CAD/CAM Restoration." Operative Dentistry 42, no. 2 (March 1, 2017): 117–21. http://dx.doi.org/10.2341/16-117-s.
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SUMMARY Computer-aided design and manufacturing technology enables practitioners to create, in a single appointment, indirect restorations that are esthetic and functionally unique to the patient's situation. The popular effort to perform minimally invasive dentistry using digital techniques with chairside milling can lead dentists to novel individualized restorative treatment. This article demonstrates a conservative anterior partial coverage restoration, utilizing both digital technology and chairside ceramic characterization to achieve an optimal esthetic outcome while preserving healthy tooth structure.
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Augusti, Davide, Gabriele Augusti, Andrea Borgonovo, Massimo Amato, and Dino Re. "Inlay-Retained Fixed Dental Prosthesis: A Clinical Option Using Monolithic Zirconia." Case Reports in Dentistry 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/629786.
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Different indirect restorations to replace a single missing tooth in the posterior region are available in dentistry: traditional full-coverage fixed dental prostheses (FDPs), implant-supported crowns (ISC), and inlay-retained FDPs (IRFDP). Resin bonded FDPs represent a minimally invasive procedure; preexisting fillings can minimize tooth structure removal and give retention to the IRFDP, transforming it into an ultraconservative option. New high strength zirconia ceramics, with their stiffness and high mechanical properties, could be considered a right choice for an IRFDP rehabilitation. The case report presented describes an IRFDP treatment using a CAD/CAM monolithic zirconia IRFDP; clinical and laboratory steps are illustrated, according to the most recent scientific protocols. Adhesive procedures are focused on the Y-TZP and tooth substrate conditioning methods. Nice esthetic and functional integration of indirect restoration at two-year follow-up confirmed the success of this conservative approach.
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Jasienko, Jerzy, Łukasz Bednarz, and Dariusz Bajno. "Conservation of the Structure and Materials of Historic Masonry Walls." Key Engineering Materials 624 (September 2014): 354–62. http://dx.doi.org/10.4028/www.scientific.net/kem.624.354.
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The paper presents a structural analysis, restoration programme and scope of conservation work essential for protecting historical values based on the example of an overstretched retaining wall providing support for the embankment of an heritage church. The focus was on analysing the status of an historic stone wall constructed in part with bog iron ore (metal ore or iron-rich sedimentary rock). Ore was used for iron smelting and also as a building material. Bog iron ore was frequently used in construction across Poland, especially in places where the raw material was locally available, aesthetically attractive and had mechanical properties approximating the durability of ceramic bricks. The material was characterised by high porosity, low resistance to diffusion and high resistance to freezing, which meant that it could be used successfully in structures subjected to atmospheric impacts without additional protection
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Sellan, Pablo Lenin Benitez, Larissa Mendes Campaner, João Paulo Mendes Tribst, Amanda Maria de Oliveira Dal Piva, Guilherme Schmitt de Andrade, Alexandre Luiz Souto Borges, Eduardo Bresciani, Antonio Lanzotti, and Pietro Ausiello. "Functional or Nonfunctional Cusps Preservation for Molars Restored with Indirect Composite or Glass-Ceramic Onlays: 3D FEA Study." Polymers 13, no. 21 (November 5, 2021): 3831. http://dx.doi.org/10.3390/polym13213831.
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Evidence regarding the effect of the onlay preparation design for different CAD/CAM restorative materials considering the preservation of cusps is lacking. Molars were 3D-modeled in four preparation designs for onlay restoration: traditional design with functional cusp coverage (TFC), non-retentive design with functional cusp coverage (NFC), traditional design with non-functional cusp coverage (TNFC) and non-retentive design with non-functional cusp coverage (NNFC). The restorations were simulated with two CAD/CAM restorative materials: LD—lithium disilicate (IPS e.max CAD) and RC—resin composite (GrandioBloc). A 100 N axial load was applied to the occlusal surface, simulating the centric contact point. Von Mises (VM) and maximum principal (Pmax) stress were evaluated for restorations, cement layer and dental substrate. The non-retentive preparation design reduced the stress concentration in the tooth structure in comparison to the conventional retentive design. For LD onlays, the stress distribution on the restoration intaglio surface showed that the preparation design, as well as the prepared cusp, influenced the stress magnitude. The non-retentive preparation design provided better load distribution in both restorative materials and more advantageous for molar structure. The resin composite restoration on thenon-functional cusp is recommended when the functional cusp is preserved in order to associate conservative dentistry and low-stress magnitude.
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Pollington, Sarah. "Novel Glass-Ceramics for Dental Restorations." Journal of Contemporary Dental Practice 12, no. 1 (2011): 60–67. http://dx.doi.org/10.5005/jp-journals-10024-1011.
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ABSTRACT Background There are many different ceramic systems available on the market for dental restorations. Glass-ceramics are a popular choice due to their excellent esthetics and ability to bond to tooth structure allowing a more conservative approach. However, at present, these materials have insufficient strength to be used reliably in posterior regions of the mouth. Purpose The aim of this review article is to discuss the types of novel glass-ceramic currently be investigated including composition, microstructure and properties. Conclusion Current research in glass-ceramics focuses on the quest for a highly esthetic material along with sufficient strength to enable crowns and bridgework to be reliably placed in these areas. Clinical significance There is a gap in the market for a machinable resin bonded glass-ceramic with sufficient strength as well as excellent esthetics. How to cite this article Pollington S. Novel Glass-Ceramics for Dental Restorations. J Contemp Dent Pract 2011;12(1): 60-67.
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Araújo, Sara. "Filling and retouching techniques in outdoor tiles with saline efflorescence problems. A case study." Ge-conservacion 18, no. 1 (December 10, 2020): 238–46. http://dx.doi.org/10.37558/gec.v18i1.841.
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This article will be focusing on a retouching conservation and restoration treatment, of two figurative ceramic tiles panels belonging to the Baroque artistic period. The ceramic tiles of blue and white colors dating from the final of the 18th century are inserted in a relevant historical period for the Portuguese tiles art entitled Grande produção Joanina. The purpose of the intervention was the return the readability of the scenes in the panels, without hiding major signs of degradation. This conservation treatment was made within a rehabilitation project of the building that holds them, which had its own intervention criteria and in which the conservation criteria had to fit. One of the issues during this case study, was to find a commitment between the conservation ethical approaches, considering the panels will continue to be exposed outdoors and there are soluble salts present on the wall where they are settled. The intervention criteria chosen was made, using diverse solutions within materials and techniques such as the application of new ceramic elements, filling gaps with lime mortars and al fresco retouching. A capillarity and permeability based method was used to fill the glazed gaps. Retouching methods were tested including neutral tone or continuing the shapes and tones. In the end al fresco retouching method was chosen and the preparation of the new ceramic elements supported by a study of graphic and photographic documentation, completing the big gaps in the panels. The results of the chosen al fresco technique show a satisfactory level of mimicry, enough to return the readability of the panel. This technique revealed to be suitable for the retouching of ceramic substrates affected by soluble salts. The reading of the scene panels became passively also, by completion the missing parts, with the introduction of new elements what, was achieved with success too.
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Ricciotti, Laura, Alessio Occhicone, Claudio Ferone, Raffaele Cioffi, Oreste Tarallo, and Giuseppina Roviello. "Development of Geopolymer-Based Materials with Ceramic Waste for Artistic and Restoration Applications." Materials 15, no. 23 (December 2, 2022): 8600. http://dx.doi.org/10.3390/ma15238600.
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This contribution presents the preparation and characterization of new geopolymer-based mortars obtained from recycling waste deriving from the production process and the “end-of-life” of porcelain stoneware products. Structural, morphological, and mechanical studies carried out on different kinds of mortars prepared by using several types of by-products (i.e., pressed burnt and extruded ceramic waste, raw pressed and gypsum resulting from exhausted moulds) point out that these systems can be easily cast, also in complex shapes, and show a more consistent microstructure with respect to the geopolymer paste, with a reduced amount of microcracks. Moreover, the excellent adhesion of these materials to common substrates such as pottery and earthenware, even for an elevated concentration of filler, suggests their use in the field of technical-artistic value-added applications, such as restoration, conservation, and/or rehabilitation of historic monuments, or simply as materials for building revetments. For all these reasons, the proposed materials could represent valuable candidates to try to overcome some problems experienced in the cultural heritage sector concerning the selection of environmentally friendly materials that simultaneously meet art and design technical requirements.
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PAVEL, CARMEN, FLORIN CONSTANTIN, COSMIN IOAN SUCIU, and ROXANA BUGOI. "X-RAY TOMOGRAPHY STUDIES OF PREHISTORIC CERAMIC ARTIFACTS." International Journal of Modern Physics: Conference Series 27 (January 2014): 1460135. http://dx.doi.org/10.1142/s2010194514601355.
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X-ray Computed Tomography (CT) is a powerful non-destructive technique that can yield interesting structural information not discernible through visual examination only. This paper presents the results of the CT scans of four objects belonging to the Romanian cultural heritage attributed to the Vinča, Cucuteni and Cruceni-Belegiš cultures. The study was performed with an X-ray tomographic device developed at the Department for Applied Nuclear Physics from Horia Hulubei National Institute for Nuclear Physics and Engineering in Măgurele, Romania. This apparatus was specially designed for archaeometric studies of low-Z artifacts: ceramic, wood, bone. The tomographic investigations revealed the internal configuration of the objects and provided information about the degree to which the previous manipulations affected the archaeological items. Based on the X-ray images resulting from the CT scans, hints about the techniques used in the manufacturing of the artifacts were obtained, as well as some indications useful for conservation/restoration purposes.
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Shen, Jingyi, Li Li, Ji-Peng Wang, Xiaoxi Li, Dandan Zhang, Juan Ji, and Ji-Yuan Luan. "Architectural Glazed Tiles Used in Ancient Chinese Screen Walls (15th–18th Century AD): Ceramic Technology, Decay Process and Conservation." Materials 14, no. 23 (November 24, 2021): 7146. http://dx.doi.org/10.3390/ma14237146.
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The glazed tile is an important building material used throughout the history of traditional Chinese architecture. Architectural glazed tiles used to decorate the screen walls of ancient China are studied scientifically for the first time. More than 30 glazed tile samples from the screen walls of the 15th to 18th century AD of the Hancheng Confucian Temple and Town God’s Temple in Shaanxi Province were carefully investigated using SEM–EDS and XRD. Microstructure and chemistry indicated the raw materials, the recipes and the technological choices used to produce the paste and glaze of the glazed tile samples studied. The causes for the key degradation processes of these glazed tiles used as building materials in the screen walls have also been discussed. This work has clear implications for the restoration and conservation treatments on these kinds of ancient Chinese building materials.
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Jurado, C., H. Watanabe, J. Villalobos Tinoco, H. Ureta Valenzuela, G. Guzman Perez, and A. Tsujimoto. "A Conservative Approach to Ceramic Veneers: A Case Report." Operative Dentistry 45, no. 3 (May 1, 2020): 229–34. http://dx.doi.org/10.2341/19-051-t.
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SUMMARY Bonding to enamel has been shown to provide reliable results, and thus conservative tooth preparations are key to the success of ceramic bonded restorations. The wax-up is the first diagnostic tool available to evaluate discrepancies between current and ideal tooth proportions. The clinician's diagnostic mock-up provides the patient with a visual perception of the size and shape of the proposed restorations. The use of reduction guides assists the restorative dentist in evaluating the specific amount of tooth structure to be removed during preparation. Furthermore, total isolation with a rubber dam prior to bonding the final restorations is crucial for the success of adhesive protocols. The aim of this report is to demonstrate a conservative approach to tooth preparation with a complete isolation technique prior to bonding eight ceramic restorations.
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Akhmedov, Jasurbek Zokirzhonovich. "Ahsikent – A Unique Site of Fergana Valley." Ethnic Culture, no. 1 (2) (March 20, 2020): 6–8. http://dx.doi.org/10.31483/r-75065.
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The article is devoted to the issues of Ahsikent’s archaeological sites museumification. The aim of the article is to consider Ahsikent, which is the only thoroughly explored historical city of Ferghana, where as a result of archeological studies pottery in which iron and copper from Shakhristan were melted, as well as metal furnaces from artisans’ trade shops were found. Methods of study. The archaeological study of the site, which is described as "Fergana Afrosiyob", began in 1885. The results of the research. Excavations have shown that in the trade shops of Ahsikent various objects made with simplest metal and used for building and housekeeping, as well as swords and kargases that are capable to cut stones and not break when bending. The author also outlines that items found on the territory of Ahsikent indicate a high level of development of various crafts: pottery, metallurgy of bronze, contexture, jewelry, etc. The article also describes the methods of chemical conservation of sites, in particular, specific steps to restore the historical site of the The article also describes methods of chemical preservation of sites, specific steps to restore the historical site are proposed, among them: restoration of the ancient medieval appearance of Ahsikent with drawings and reliefs that depict the landscapes of Ahsikent; demonstration of the political, social and economic state of Ahsikent (writing, medical articles, coins); publication of decorative and applied art created by artisans (ceramics, glassware, jewelry), items related to military art (weapons of soldiers, arrows, bows), architectural structures (fragments of architectural decoration, foundations, stone products, ceramic pipes, wall paintings). It is concluded that it would be advisable to organize a multi-sided, deep and thorough study of the site of Ahsikent by attracting appropriate different specialists, turn Ahsikent into an open-air museum and introduce this area to international tourist destinations.
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da Cunha, Leonardo Fernandes, Rayane Alexandra Prochnow, Adriana Osten Costacurta, Carla Castiglia Gonzaga, and Gisele Maria Correr. "Replacement of Anterior Composite Resin Restorations Using Conservative Ceramics for Occlusal and Periodontal Rehabilitation: An 18-Month Clinical Follow-Up." Case Reports in Dentistry 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/9728593.
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This case report describes a patient with discolored and fractured composite resin restorations on the anterior teeth in whom substitution was indicated. After wax-up and mock-up, the composite was removed and replaced with minimally invasive ceramic laminates. An established and predictable protocol was performed using resin cement. Minimally invasive ceramic restorations are increasingly being used to replace composite restorations. This treatment improves the occlusal and periodontal aspects during the planning and restorative phases, such as anterior guides, and laterality can be restored easily with ceramic laminates. In addition, the surface smoothness and contour of ceramic restorations do not affect the health of the surrounding periodontal tissues. Here we present the outcome after 18 months of clinical follow-up in a patient in whom composite resin restorations in the anterior teeth were replaced with minimally invasive ceramic laminates.
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Ałykow, Krzysztof, Łukasz Bednarz, Magdalena Piechówka-Mielnik, Magdalena Napiórkowska-Ałykow, and Michał Krupa. "New Ceramic Tiles Produced Using Old Technology Applied on Historic Roofs—Possibilities and Challenges." Materials 15, no. 21 (November 6, 2022): 7835. http://dx.doi.org/10.3390/ma15217835.
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In the case of historic buildings, especially those under protection, it is important to replace elements of the roof covering, while maintaining current technical standards, to meet the requirements of the conservator. The authors of the article present alternatives to commonly used solutions, based on their experience with replacing historic building roofing with ceramic tiles made according to the production and firing technology of the nineteenth century. They emphasize that the correct/specialized restoration of existing tiles in a building makes it possible to preserve and reuse them, which is in line with the principles of historic preservation. However, due to the preservation of the roof tiles, it is not always possible to revitalize them. As a solution to the problem, the use of clay roof tiles manufactured according to 19th-century firing technology, including handmade methods, is presented, which preserves the geometry of the historic roof tiles. The approach presented by the authors meets both the requirements of conservation theory and the building standards for roofing elements. Although it is much more expensive than the solutions currently commonly used that result from modern technical requirements and tile-manufacturing technology, in the case of objects of significant cultural heritage, it is a solution that meets modern technical requirements while not compromising the original appearance of the monument.
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Krump, Michal, and Zelmira Krumpova. "Esthetic Rehabilitation of Anterior Dentition with Different Types of Ceramic Restorations: Two Case Reports." European Journal of Dentistry 16, no. 01 (October 1, 2021): 234–39. http://dx.doi.org/10.1055/s-0041-1732805.
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AbstractAll-ceramic systems represent an excellent restorative alternative for fixed dental prostheses, single crowns, and veneers in the anterior dentition. With respect to improved mechanical properties, lithium disilicate ceramic material provide a broad range of indications, and extended veneers can serve as an alternative to full crowns. Although ceramic veneers represent a more conservative approach compared to crowns, the correct indication is essential to achieving the ideal outcome. The following case reports describe two types of fixed restorations of the anterior dentition: extended lithium disilicate ceramic veneers and lithium disilicate full crowns. Factors influencing treatment selection for each type of restorations are presented.
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Żurawski, Bogdan, Aneta Cedro, and Magdalena Bury. "Banganarti and Selib in the 2013/2014 and 2014/2015 seasons with Appendix 1: Pottery from Selib. Preliminary report (2013/2014 and 2014/2015 seasons), Appendix 2: Osteoarchaeological analyses of skeletal material from Selib 1 and Banganarti (2013/2014 and 2014/2015 seasons)." Polish Archaeology in the Mediterranean 25 (May 15, 2017): 349–402. http://dx.doi.org/10.5604/01.3001.0010.1867.
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The Polish archaeological project excavating at the Nubian sites of Banganarti and Selib concentrated on uncovering domestic architecture: the northeastern and southwestern districts at medieval Christian Banganarti and selected houses of Meroitic date at Selib 2. The conservation and restoration program put the finishing touches on the Raphaelion church in Banganarti and did substantial work on the remains of the earlier churches. The oldest church from Selib 1 was investigated and dated to the 6th–7th century based on a study of a well stratified ceramic assemblage. Pottery from the northern and southern refuse dumps ranged in date from the 9th to the 12th/13th century. A group of liturgical vessels, containing mostly small juglets and chalices, was distinguished in this assemblage. Exploration of the earlier Northern Building revealed pottery contemporaneous with the earliest phase of the church on site. Anthropological research was carried out on skeletal remains from the medieval cemeteries of Selib 1 and from individual graves at Banganarti. The results of ceramic studies and of the anthropological examination are reported in separate appendices to the main report.
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Ibbetson, Richard, and Ian R. Jones. "All-Ceramic inlays and onlays for posterior teeth." Dental Update 46, no. 7 (July 2, 2019): 610–24. http://dx.doi.org/10.12968/denu.2019.46.7.610.
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The increasing requirement for aesthetic restorations has been matched by the continuing improvements in dental materials and fabrication techniques. These factors have resulted in the development of newer ways of making tooth-coloured restorations for posterior teeth. The value of preserving tooth tissue is widely appreciated and the use of partial coverage restorations can assist this aim. The use of porcelain inlays and onlays etched with hydrofluoric acid together with improved composite resin-luting agents offers the dentist and patient the option of a conservative and aesthetic restoration for more extensively damaged posterior teeth. The paper describes the indications and clinical procedures for the use of these restorations. CPD/Clinical Relevance: Porcelain inlays and onlays offer a predictable alternative to full coverage crowns and should be part of the clinician's armamentarium.
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Wahab, Fouad Kadim, Sari Adel Mahasneh, Faleh Abdelhafeeth Sawair, Mahmoud Anwar Hamdan, Susan Nweiser Hattar, and Mohammad Abdalla AL-Rabab’ah. "Restoration of Root Filled Teeth; Current Opinions and Techniques." Open Dentistry Journal 15, no. 1 (March 22, 2021): 71–83. http://dx.doi.org/10.2174/1874210602115010071.
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Purpose: To examine current decision-making preferences of Jordanian dentists when Restoring Root Filled Teeth (RFT). Materials and Methods: 834 Jordanian general dentists, prosthodontists and endodontists were invited to participate in a validated online survey with a 62% participation rate. Respondents were invited to answer 24 questions about their preferences for techniques and materials they use to restore RFT. The questions aimed at exploring restorative strategies commonly employed by Jordanian dentists when managing root filled teeth with extensive loss of tooth structure. Results: A minority of dentists consider direct resin restoration as the sole restoration for RFT with extensive loss of tooth structure. Full coverage metal-ceramic and all-ceramic crowns are more popular than endocrowns when restoring RFT with indirect restoration. Fiber posts are the most popular type of posts, followed by prefabricated metal posts. Glass ionomer is the most preferred cement for luting metal posts, while conventional dual resin cement with separate etch and rinse bonding strategy is the most employed when bonding fiber posts. The majority of dentists tend not to pretreat fiber posts. Loss of post/core retention or fracture of coronal tooth structure are the two most common reasons observed by dentists when RFT fail. Conclusion: Use of post and core is still preferred over more conservative approaches when restoring RFT with extensive loss of coronal tooth structure. Longevity of restorations can be enhanced by training practicing dentists on evidence-based adhesive strategies.
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Drancourt, Noémie, Emmanuel Nicolas, Jean-Luc Veyrune, and Marion Bessadet. "Comprehensive CAD/CAM Prosthetic Rehabilitation Management in a Young Patient with Agenesis: A Case Report." Healthcare 10, no. 2 (February 17, 2022): 382. http://dx.doi.org/10.3390/healthcare10020382.
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With the advancement in ceramic restorations bonded to the tooth structure, the treatment has become a practicable and conservative option to restore teeth with shape alteration owing to the high demand for aesthetics, with minimum tooth preparation. This article describes the case of a 25-year-old man who was dissatisfied with his smile. After an assessment of the clinical situation, a decision was made to place a full-mouth prosthodontic rehabilitation (monolithic lithium disilicate glass-ceramic, IPS E-max CAD) with minimal tooth preparation, which figures as a conservative full-coverage approach. The restoration of an aesthetic smile resulted in the patient’s satisfaction. Bonding of all monolithic veenerlay and crowns onto minimally prepared teeth figures as conservative treatment in cases of hypodontia.
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Miranda, ME, KA Olivieri, FJ Rigolin, and RT Basting. "Ceramic Fragments and Metal-free Full Crowns: A Conservative Esthetic Option for Closing Diastemas and Rehabilitating Smiles." Operative Dentistry 38, no. 6 (November 1, 2013): 567–71. http://dx.doi.org/10.2341/12-225-t.
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SUMMARY Dental ceramics make it possible to restore anterior teeth that have been esthetically compromised, presenting a high resistance to wear, biocompatibility, color stability, and low thermal conductivity. The development of different types of ceramic and techniques for adhesive cementation have made it possible to produce more conservative restorations without involving the healthy dental structure and with minimally invasive preparation, such as the bonding of ceramic fragments. The purpose of this article is to describe a clinical case in which diastemas were closed by using nanofluorapatite ceramic (e.max Ceram, Ivoclar-Vivadent) fragments on teeth 7 and 10 with minimal tooth preparation and metal-free ceramic crowns (e-max Ceram) reinforced with zirconia copings through a computer-aided design/computer-aided manufacturing system (Lava, 3M-ESPE) on teeth 8 and 9.
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Carlos, Roopak Bose, Mohan Thomas Nainan, Shamina Pradhan, Roshni Sharma, Shiny Benjamin, and Rajani Rose. "Restoration of Endodontically Treated Molars Using All Ceramic Endocrowns." Case Reports in Dentistry 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/210763.
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Clinical success of endodontically treated posterior teeth is determined by the postendodontic restoration. Several options have been proposed to restore endodontically treated teeth. Endocrowns represent a conservative and esthetic restorative alternative to full coverage crowns. The preparation consists of a circular equigingival butt-joint margin and central retention cavity into the entire pulp chamber constructing both the crown and the core as a single unit. The case reports discussed here are moderately damaged endodontically treated molars restored using all ceramic endocrowns fabricated using two different systems, namely, CAD/CAM and pressed ceramic.
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Rocca, GT, N. Rizcalla, and I. Krejci. "Fiber-reinforced Resin Coating for Endocrown Preparations: A Technical Report." Operative Dentistry 38, no. 3 (April 1, 2013): 242–48. http://dx.doi.org/10.2341/12-139-tr.
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SUMMARY Coronal rehabilitation of endodontically treated posterior teeth is still a controversial issue. Although the use of classical crowns supported by radicular metal posts remains widespread in dentistry, their invasiveness has been largely criticized. New materials and therapeutic options based entirely on adhesion are available nowadays, from direct composite resins to indirect endocrowns. They allow for a more conservative, faster, and less expensive dental treatment. However, the absence of a metal or high-strength ceramic substructure as in full-crown restorations can expose this kind of restoration to a higher risk of irreversible fracture in case of crack propagation. The aim of this case report is to present a technique to reinforce the cavity of an endodontically treated tooth by incorporating a fiber-reinforced composite (FRC) layer into the resin coating of the tooth preparation, before the final impressions of the cavity. This technique allows the use of FRCs in combination with any kind of restorative material for an adhesive overlay/endocrown.
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Felberg, Rodrigo Volz, Rafaela Bassani, Gabriel Kalil Rocha Pereira, Ataís Bacchi, Yara Teresinha Corrêa Silva-Sousa, Erica Alves Gomes, Rafael Sarkis-Onofre, and Aloísio Oro Spazzin. "Restorative Possibilities Using Zirconia Ceramics for Single Crowns." Brazilian Dental Journal 30, no. 5 (October 2019): 446–52. http://dx.doi.org/10.1590/0103-6440201902780.
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Abstract Two clinical cases are presented to explore technical differences and discusses the advantages and disadvantages of using veneered or monolithic zirconia to manufacture posterior single crowns. The first case describes the clinical steps in manufacturing a monolithic crown on a mandibular left second premolar using high translucency zirconia. It shows the use of a conservative tooth preparation based on the superior mechanical properties that this material presents as well as the final optical characteristics achieved by shading and staining. In the second case, a conventional bilayer restorative treatment was made using zirconia framework followed by veneering with feldspar ceramic on a mandibular left first molar. Recent literature indicates that each of these restorative alternatives presents specific advantages and disadvantages. Factors such as mechanical performance, fracture, esthetic characteristics, clinical success, complication rates, adhesion and antagonist wear performance are discussed comparing the two restorative assemblies. The data highlight that monolithic crowns prevent a major problem reported on bilayer restorations: the chipping of veneering ceramic. Monolithic crowns also allow minimally invasive tooth preparations, thus increasing tooth remnant preservation. However, data that support esthetic performance similarity between monolithic and bilayer assemblies are lacking, thus the predictability of use is restricted for the posterior region, as cases demanding high esthetic appeal continue to fundamentally use bilayer restorations. Failures were not found, and patient satisfaction was reported in both techniques after the 12-month follow up.
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Maravelaki, Pagona-Noni, Antonis Theologitis, Meral Budak Unaler, Chrysi Kapridaki, Kali Kapetanaki, and James Wright. "Characterization of Ancient Mortars from Minoan City of Kommos in Crete." Heritage 4, no. 4 (October 22, 2021): 3908–18. http://dx.doi.org/10.3390/heritage4040214.
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This work characterizes ancient mortars used in construction of the Bronze Age Minoan port at Kommos in Crete. The port dates from c. 1850 BCE with port facilities at the harbor and residences on the Central hillside and the Hilltop. A Greek, Phoenician, and Roman sanctuary overlies the administrative center. The first step collected representative samples from the different construction phases, previous conservation interventions, exposure to different environmental factors, and different material composition. From these 10 mortar samples were analyzed using stereo- and digital microscopy, X-ray diffraction (XRD), X-ray Fluorescence (XRF), and Fourier Transform Infrared spectroscopy (FTIR) to determine texture, morphology, mineralogical, and physico-chemical properties. The physico-chemical and mineralogical analyses divided the samples into two groups: lime binder mortars and earthen binder mortars. The main minerals identified in the samples are calcite, quartz, dolomite, illite, albite, kaolinite, and vermiculite. Analysis of local clay showed that local materials were used in the production of these mortars. The analysis of mortar samples with stereomicroscopy, XRF, and FTIR showed that the samples are mainly composed of calcite and silicates in major quantities along with aluminum, magnesium, and iron oxide in minor quantities. A wide variety of local aggregates and ceramic fragments were used in the production of these ancient mortars. The mortar condition resulted in a decay state that needs conservation interventions. This characterization of the ancient mortars was important for the design of compatible restoration mortars.
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Scatigno, Claudia, Maria Preite Martinez, Nagore Prieto-Taboada, Juan Manual Madariaga, and Aida Maria Conte. "Petrographic-Mineralogical Characterization of Archaeological Materials from “Casa di Diana” Mithraeum Sited in the Open Museum of Ostia Antica." Crystals 11, no. 7 (July 20, 2021): 839. http://dx.doi.org/10.3390/cryst11070839.
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Mithraea, religious Roman buildings, are very common in Italian archeological sites. There are sixteen in Ostia Antica (Rome, Italy)The poor state of conservation, due to the intrinsic environmental conditions, characterized them: they consist of open-air museums and caves simultaneously. These places of worship are characterized by the presence of heterogeneous materials, such as wall building materials (bricks and mortars) and others used for furnishings and fittings. This increases the risk of accelerated damage because the materials ‘rheology is different. Here, a full petrographic-mineralogical characterization with polarized light microscopy (PLM), X-ray diffraction (XRD), scanning electron microscope with energy dispersive X-ray (SEM-EDS) and isotopic analysis (δ13C, δ18O) is carried out on materials like travertine, marble, pumice, ceramic, and wall-building materials in “Casa di Diana” Mithraeum (Ostia Antica). Their characterization gives provenance information as well as conservation and restoration purposes. The prevalence of siliciclastic or carbonate components discriminates between red and yellow bricks, as well as different textures and minerals in the aggregate of the red ones. The mortars are typically pozzolanic, and the aggregate is mostly made up of black and red pozzolanic clasts. In the altar, apse, and aedicule, which constitute the principal place of the Mithraeum, a variety of materials used for the ornamental purpose are represented by pumices, travertine, marble, and limestone. The altar material, catalogued as marble, resulted in being a limestone coated with a white pigment.
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Mathew, Josey, Liza George, Sinju Paul, Aleesha Joy, Beulah M. Bejoy, and Sethuparvathi Anitha. "“Conservative Bonded Restoration (An Alternative to Full Coverage Crown): A Case Report on Endocrown." Conservative Dentistry and Endodontic Journal 5, no. 2 (2020): 42–47. http://dx.doi.org/10.5005/jp-journals-10048-0061.
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ABSTRACT Background The restoration of endodontically treated tooth (ETT) with substantial loss of the tooth structure is challenging as it carries a higher chance of biomechanical failure than vital tooth in restorative dentistry. Post combined with complete coverage restoration is a well-established technique to save such teeth from fracture, but it does not follow the minimal invasive principles of adhesive dentistry. Case description This case report describes the management of endodontically treated mandibular premolar with lithium disilicate glass-ceramic endocrown (Emax). Conclusion Endocrown is a feasible option for the restoration of extensively damaged posterior tooth after endodontic treatment. Since posterior teeth are vulnerable to tooth loss, endocrown, which is a single partial restoration, can be regarded as replacing a single crown with intraradicular retention. How to cite this article Bejoy BM, Anitha S, George L. Conservative Bonded Restoration (An Alternative to Full Coverage Crown): A Case Report on Endocrown. Cons Dent Endod J 2020;5(2):42–47.
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Pereira, M., T. de Lacerda-Arôso, M. J. M. Gomes, A. Mata, L. C. Alves, and Philippe Colomban. "Ancient Portuguese Ceramic Wall Tiles (“Azulejos”): Characterization of the Glaze and Ceramic Pigments." Journal of Nano Research 8 (September 2009): 79–88. http://dx.doi.org/10.4028/www.scientific.net/jnanor.8.79.
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Ancient ceramic wall tiles, called “azulejo”, firstly used on Portuguese churches, monasteries and palaces (15-18th century) have progressively been used in particular houses till the last century. These tiles and its use in huge decorative panels can be considered as a precious but fragile cultural heritage from Brazil to India, in several countries influenced by Portuguese culture. Morphologically, these tiles are composed by a porous clay-based ceramic body, the terracotta, covered by a protective glassy phase, the glaze. As artistic paintings, these murals incorporated various kinds of pigments in the glaze layer to create a pictorial impact on the walls of rich palaces or churches, real and durable monumental works-of-art. In the 21st century, degradation marks are visible on these ceramic tiles because of their use under corrosive conditions (moisture, atmospheric cycles…) along centuries. In order to promote their conservation and enhance their restoration, the physical-chemical characterization of the azulejos is performed in the present work, using mainly non-destructive processes like micro-Raman spectroscopy or X-Ray diffraction. In particular, Raman spectroscopy allows the detection of some nano/microcrystals present in the amorphous glaze due to pigments or opacifying agents or related to the elaboration process of the azulejo. Based on the observation of various selected fragments, one states that very few pigments have been used as colouring agents in this ceramic art during 17-18th centuries. Thus, the relationship between the different colours, the introduced pigments and the structural aspects of the glass will be focused. Some features related with the ancient ceramic technology will also be discussed.
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Santos, Mariana, Ana Sofia Coelho, Anabela Baptista Paula, Carlos Miguel Marto, Inês Amaro, José Saraiva, Manuel Marques Ferreira, Pedro Antunes, and Eunice Carrilho. "Mechanical and Tribological Characterization of a Dental Ceromer." Journal of Functional Biomaterials 11, no. 1 (February 21, 2020): 11. http://dx.doi.org/10.3390/jfb11010011.
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Background: Indirect restorations using composites with ceramic fillings can be an alternative to ceramic veneering and direct composite restorations for the treatment of posterior teeth. The aim of this study was the evaluation of the mechanical and tribological properties of a ceromer. Materials and Methods: Sixty specimens were produced and divided into two groups: one control group not submitted to thermocycling (n = 20) and one test group submitted to 5000 cycles of thermocycling (n = 40). The studied parameters were microhardness, surface roughness and the coefficient of friction (scratch test). Results: The ceromer exhibits a reduction of polymerization shrinkage, higher wear, and fracture resistance than the composite resins. The studied ceromer presented good mechanical properties, even after being submitted to thermocycling. Roughness was the property most affected, increasing 25.8%, microhardness decreased by 10.5% and the coefficient of friction increased by 4.2%. Conclusions: In certain situations, ceromers can be an alternative to composite resins and ceramics, providing an aesthetic, conservative and longevity option.
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Qaiser, Shazeena, Darshana Devadiga, and Mithra N. Hegde. "Esthetic Rehabilitation With Nanohybrid Composite: Case Report Series." Journal of Advanced Oral Research 11, no. 2 (October 22, 2020): 251–56. http://dx.doi.org/10.1177/2320206820960561.
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Composite resins represent the current state of the art in the field of restorative materials, for they present a standard aesthetic potential with satisfactory durability and are less cost-effective than a comparable ceramic restoration. The most recent addition to this is a nanohybrid direct composite that demonstrates exceptional handling properties and superior aesthetics. These series of case reports illustrate the three different scenarios where nanohybrid composite was used as a direct restorative material owing to its high smoothness and favorable mechanical properties; the first case being the fracture of an upper lateral incisor, second of Class IV caries in upper central incisors, and lastly the discolored restoration and Class III caries in upper central incisors. The nanohybrids used provided an acceptable color match in all the three cases with a conservative technique and were relatively easy to maintain.
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A. Radkevich, K. Netesa, and T. Tkach. "Trends in facade system overhaul based on the data analysis of procurement contracts via the PROZORRO public e-procurement system." Ways to Improve Construction Efficiency, no. 45 (October 16, 2020): 120–30. http://dx.doi.org/10.32347/2707-501x.2020.45.120-130.
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Obviously, it goes without saying that sustainable economic development and an increase in the cost of energy carriers require improvements in the energy efficiency of existing buildings and structures. For this reason, intelligent energy monitoring and searching for new methods aimed at improving the performance of buildings have been of utmost importance. One of the feasible solutions to improving the performance of existing buildings would arguably be the reduction in energy costs by increasing the insulating properties of their facade systems. This paper analyses the current trends in the overhaul of facade systems in Ukraine. The research results into facade system renovation conducted via the ProZorro public e-procurement system demonstrated that a significant number of repair works were the improvements in the thermal insulation properties of facade systems by means of mineral wool panels and plaster cladding. The percentage of this type of overhaul contracts reached 67% of the total number of investigated contracts. Facade insulation renovation using expanded polystyrene plates approximately made up 20%. The restoration works of an outer layer of façade systems, including plaster restoration, spot-priming, restoration of hard putty, plaster facing and painting works, revetment, etc., which do not impact the energy efficiency of a building, made up about 13% of the total number of contracts. The area of façade works in question averaged from 200 m2 to 1500 m2. Having compared the prices per one square metre of a façade system, the average cost for such works has been calculated in the range of 1500 UAH to 2000 UAH; while the cost of advanced works ranged from 3500 UAH to 4000 UAH. Given a short maintenance-free service life of 7-10 years of the corresponding systems and guided by cost-effectiveness reasons, it has been suggested replacing these facade systems with ventilated facade systems with thermal insulation and ceramic cladding. This façade system has proved to have a significantly longer durability and maintenance-free service life, while the initial investment costs will further increase the energy efficiency properties of a building. As the result, this will enable keeping energy operating costs to minimum, which will consequently increase the building’s cost-effectiveness and its compliance with current global trends in energy conservation.
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Orides Ferrari Jr., Fernando Dalitz, Marina Samara Baechtold, Ubiracy Gaião, Leonardo Fernandes da Cunha, Carla Castiglia Gonzaga, and Gisele Maria Correr. "Esthetic rehabilitation of anterior teeth through gingival recontouring and ceramic veneers: a case report." RSBO 13, no. 4 (December 20, 2016): 275–9. http://dx.doi.org/10.21726/rsbo.v13i4.1592.
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Esthetic rehabilitations require a broad and thorough evaluation of all the elements that make up the smile such as lips, dental, and periodontal structures to plan the treatment to provide harmony to the whole set. Objective: To demonstrate through a case the association of Periodontics and Restorative Dentistry in the esthetic rehabilitation of anterior teeth replacing resin restorations by modifying the gingival architecture conservatively and harmonically. Case report: It is essential for a multidisciplinary approach to succeed in treatment. The replacement of previous restorations is an increasing demand in currently clinical practice, for many reasons, mainly due to dissatisfaction with the esthetics. It is observed that many of these patients involve not only dissatisfaction with the dental structure but also with the periodontal health, for this reason, it is necessary a previous adaptation of the gingival tissues for proper restorative rehabilitation. Conclusion: Ceramic laminates have proved to be a great choice for anterior teeth restorations, but they must be indicated in specific situations, to obtain excellent results as most conservative as possible.
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Ferrari Jr, Orides, Fernando Dalitz, Marina Samara Baechtold, Ubiracy Gaião Gaião, Leonardo Fernandes da Cunha, Carla Castiglia Gonzaga, and Gisele Maria Correr. "Esthetic rehabilitation of anterior teeth through gingival recontouring and ceramic veneers: a case report." RSBO 13, no. 4 (May 4, 2017): 275. http://dx.doi.org/10.21726/rsbo.v13i4.351.
Full textAbstract:
Esthetic rehabilitations require a broad and thorough evaluation of all the elements that make up the smile such as lips, dental, and periodontal structures to plan the treatment to provide harmony to the whole set. Objective: To demonstrate through a case the association of Periodontics and Restorative Dentistry in the esthetic rehabilitation of anterior teeth replacing resin restorations by modifying the gingival architecture conservatively and harmonically. Case report: It is essential for a multidisciplinary approach to succeed in treatment. The replacement of previous restorations is an increasing demand in currently clinical practice, for many reasons, mainly due to dissatisfaction with the esthetics. It is observed that many of these patients involve not only dissatisfaction with the dental structure but also with the periodontal health, for this reason, it is necessary a previous adaptation of the gingival tissues for proper restorative rehabilitation. Conclusion: Ceramic laminates have proved to be a great choice for anterior teeth restorations, but they must be indicated in specific situations, to obtain excellent results as most conservative as possible.