Characterization of Dental Metal-Ceramic Interfaces of Heat Pressed Ceramics on Co-Cr Frameworks Obtained with Different Technologies

2018 ◽  
Vol 876 ◽  
pp. 25-30
Author(s):  
Liliana Porojan ◽  
Mihaela Bîrdeanu ◽  
Cristina Savencu ◽  
Sorin Porojan

It is known that the quality of metal-ceramic restorations mainly depends on the interface strength. The aim of the study was to evaluate metal–ceramic interfaces of heat pressed ceramic on Co-Cr frameworks obtained with different technologies: melting-casting (CST), computerized milling (MIL), selective laser sintering (SLS) and selective laser melting (SLM). The microstructure of metal–ceramic interfaces and framework topography were characterized by scanning electron microscope (SEM). Sandblasted, polished surfaces and the cross section on the interfaces were observed. Sandblasted surfaces presented a uniform rough aspect and pronounced porous surface compared to that of polished surfaces and were better visible in SLS and SLM samples. The thickness of the veneer layer had a noticeable effect on the interface, because in the case of thicker veneers, cracks at the interfaces were visible for CST and MIL specimens. Considering the findings reported herein, some suggestions can be considered in practice, such as adaptation of the restorations morphology to the characteristics of the processed materials.

1995 ◽  
Vol 23 (12) ◽  
pp. 833-843 ◽  
Author(s):  
J. A. Hautaniemi ◽  
M. Heinonen ◽  
J. Juhanoja
Keyword(s):  

2019 ◽  
Vol 3 (1) ◽  
pp. 22
Author(s):  
Galih Paramarta ◽  
Eny Inayati

Background: The low levels of patient satisfaction and confidence in the restoration of the gingival resorption results in impaired quality of life in both functional and psychosocial aspects. It is necessary to manufacture a dental restoration to restore the mastication, phonetic, and aesthetic functions associated with soft tissue repair. Manufacture of gingiva ceramic restorations which are believed to be an alternative to restore the aesthetic function and harmonization of the patient’s teeth. In terms of manufacturing techniques, this restoration has a level of difficulty in achieving a balance between “White aesthetic” and “aesthetic pink”. Objective: This study aims to provide knowledge to the reader of Manufacturing Technique of Metal Ceramic Restoration with Implant-Abutment at Gingival Resorption Case. Reviews: Gingiva ceramic restorations can be used to create esthetic implant-supported restorations when bone and gingival tissues are deficient and surgical replacement of such tissues is not possible. Dental technicians should be able to analyze the three-dimensional shapes of gingival anatomy, color, texture, smile components, the balance of the “pink aesthetic” and “white aesthetic”. Conclusion: Manufacturing Technique of Metal Ceramic Restoration with Implant-Abutment at Gingival Resorption Case including the manufacture of metal coping, oxidation, application of opaque coating, application of the first “white aesthetic” ceramics (Opaque Dentine, Dentine, Enamel and transpa on crown coping restorations), Application of opaque gingiva layer, gingival ceramics build-up "pink aesthetics”, first firing, followed by correction build-up, and second firing, and ends with the glazing process.


2006 ◽  
Vol 46 ◽  
pp. 146-151
Author(s):  
Andriy Lotnyk ◽  
Stephan Senz ◽  
Dietrich Hesse

Single phase TiO2 thin films of anatase structure have been prepared by reactive electron beam evaporation. Epitaxial (012)- and (001)-oriented anatase films were successfully obtained on (110)- and (100)-oriented SrTiO3 substrates, respectively. X-ray diffraction and cross section transmission electron microscopy investigations revealed a good epitaxial quality of the anatase films grown on the SrTiO3 substrates.


2014 ◽  
Vol 602-603 ◽  
pp. 412-415 ◽  
Author(s):  
Yan Li Huo ◽  
Shu Guang Chen ◽  
Hai Long Liang ◽  
Chun Peng Wang ◽  
Jian Zhou ◽  
...  

High thermal conductivity and dense SiC coating were fabricated by chemical vapor deposition (CVD) on surface of different graphite at temperature of 1100°C. The results indicated that the thickness of the coating influences the quality of coating. There was no crack in coating when thickness of the coating is less than 0.3mm. The structure of graphite affected the reaction badly. When the graphite is coarse and porous the reaction is chemical vapor infiltration (CVI) and the interface of coating and substrate isnt obvious. When the graphite is dense and smooth, the coating is covered in surface of graphite, the interface is found between the coating and substrate. Optical microscope and SEM were used to observe the surface and cross-section morphology and microstructure of coatings. It shown coating and substrate had a good combination and the deposited grains mainly showed equiaxed form with the crystallite size of 30 nm at 1100°C.


1997 ◽  
Vol 45 (1) ◽  
pp. 273-279 ◽  
Author(s):  
P. Xiao ◽  
B. Derby ◽  
J. Webster ◽  
J. Penfold

Author(s):  
Жанна Владимировна Вечеркина ◽  
Наталья Витальевна Зайцева ◽  
Алина Александровна Смолина ◽  
Наталья Владимировна Примачева ◽  
Виктор Сергеевич Калиниченко

Актуальность: на сегодняшний день практически в каждодневной практике врача стоматолога-ортопеда и зубного техника есть заказ-наряд на изготовление металлокерамических зубных протезов. С сожалением, приходится констатировать факт, что металлокерамические коронки и мостовидные протезы не являются совершенными конструкциями, несмотря на долголетний опыт применения, использование современных конструкционных и вспомогательных материалов, высоких технических и инструментальных возможностей ортопедической стоматологии и зуботехнического производства. Целью работы является повышения качества ортопедического лечения путем подробного анализа возможных ошибок, осложнений при изготовлении металлокерамических протезов и способов и способов их недопущения. Материалы и методы: систематизация причин, ошибок и осложнений -как предмет данного исследования, на клинико-лабораторных этапах изготовления металлокерамических реставраций и изучение методов устранения. Результаты: после изучения клинико-лабораторных этапов изготовления металлокерамических конструкций выявлены основные виды ошибок, которые были разделены на клинические, лабораторные и ошибки на этапах литья. Предметом настоящего исследования стало подробное изучение технологических ошибок. Нами было установлены причины ошибок на каждом лабораторном этапе изготовления и представлены рекомендации по их недопущению и методы устранения. Выявлено, что наиболее часто встречающие недочеты выявляют на этапах моделирования и отливки каркаса, а также на этапах нанесения и обжига керамических масс. Заключение: возникающие ошибки и осложнения резко сокращают сроки пользования металлокерамическими конструкциями, влияют на неудовлетворенность больных качеством ортопедического лечения, провоцируют конфликты и разбирательства, а главное резко снижают качество стоматологического здоровья и жизни человека Relevance: today, almost in the everyday practice of a dentist-orthopedist and dental technician, there is an order-order for the manufacture of metal-ceramic dentures. Unfortunately, it is necessary to state the fact that metal-ceramic crowns and bridges are not perfect structures, despite the long experience of application, the use of modern structural and auxiliary materials, high technical and instrumental capabilities of orthopedic dentistry and dental production. The aim of the work is to improve the quality of orthopedic treatment by a detailed analysis of possible errors, complications in the manufacture of metal-ceramic prostheses and methods and ways to prevent them. Materials and methods: systematization of causes, errors and complications - as the subject of this study, at the clinical and laboratory stages of the manufacture of metal-ceramic restorations and the study of methods of elimination. Results: after studying the clinical and laboratory stages of manufacturing metal-ceramic structures, the main types of errors were identified, which were divided into clinical, laboratory and errors at the casting stages. The subject of this study was a detailed study of technological errors. We have identified the causes of errors at each laboratory stage of manufacturing and provided recommendations for their prevention and methods of elimination. It is revealed that the most common defects are identified at the stages of modeling and casting the frame, as well as at the stages of applying and firing ceramic masses. Conclusion: the resulting errors and complications dramatically reduce the time of use of metal-ceramic structures, affect the dissatisfaction of patients with the quality of orthopedic treatment, provoke conflicts and proceedings, and most importantly, dramatically reduce the quality of dental health and human life


2012 ◽  
Vol 23 (4) ◽  
pp. 403-408 ◽  
Author(s):  
Gisele Rodrigues da Silva ◽  
Marina Guimarães Roscoe ◽  
Cristianne Pacheco Ribeiro ◽  
Adérito Soares da Mota ◽  
Luís Roberto Marcondes Martins ◽  
...  

Dental ceramics present excellent ability to reproduce the natural teeth regarding esthetic and biomechanics. Recently, due to the advancement of ceramic technology, metal-free restorations were developed. However, the traditional metal-ceramic restorations still present the requirements of high strength, long survival in the oral environment and favorable aesthetics. In this context, it is essential to know the specificity of each ceramic system available in order to apply it properly to various clinical situations. This report describes an integrated rehabilitation using metal-ceramic restorations of a patient at 50 years of age, who presented edentulous spaces, and previous unsatisfactory composite and amalgam restorations, and indirect metallic restorations, leading to compromised quality of life in both functional and psychosocial aspects. The impact on quality of life was measured using a generic instrument, OHIP-14, validated for the World Health Organization, which covers both the biological and the psychosocial dimensions. This instrument was applied to the patient before and after treatment. The patient had an overall OHIP-14 score of 28 before the treatment and after treatment the score decreased to 0, showing that dental and oral health conditions are factors that do impact on the quality of life. Rehabilitation has provided functional and aesthetic restorations, harmony of the stomatognathic system and improvement of life quality.


1998 ◽  
Vol 535 ◽  
Author(s):  
S. E. Saddow ◽  
M. E. Okhusyen ◽  
M. S. Mazzola ◽  
M. Dudley ◽  
X. R. Huang ◽  
...  

AbstractIn this paper we discuss the growth and characterization of 3C-SiC epitaxial layers grown on both a Si substrate as well as on a novel substrate. The growth uses a typical three step process. First an etch of the Si surface is performed, second the surface of the Si is carbonized and third 3C-SiC is grown on the carbonized surface. Several characterization techniques were used to verify the quality of the 3C-SiC film. Microscopy was used to investigate the surface morphology, X-ray and electron diffraction were used to determine crystal structure, cross section TEM was used to verify crystal structure and highlight twinning, and x-ray topography was used to measure the strain fields induced in Si substrate at the 3C-SiC/Si interface.


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