scholarly journals MANUFACTURING TECHNIQUE OF METAL CERAMIC RESTORATION WITH IMPLANT-ABUTMENT AT GINGIVAL RESORPTION CASE

2019 ◽  
Vol 3 (1) ◽  
pp. 22
Author(s):  
Galih Paramarta ◽  
Eny Inayati
Keyword(s):  
Three Dimensional ◽  
Dental Restoration ◽  
Coating Application ◽  
Manufacturing Technique ◽  
Implant Abutment ◽  
Metal Ceramic ◽  
Manufacturing Techniques ◽  
The Aesthetic ◽  
Ceramic Restorations

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.

scholarly journals Effect of Digital Technologies on the Marginal Accuracy of Conventional and Cantilever Co–Cr Posterior-Fixed Partial Dentures Frameworks

2021 ◽  
Vol 11 (7) ◽  
pp. 2988
Author(s):  
Celia Tobar ◽  
Verónica Rodríguez ◽  
Carlos Lopez-Suarez ◽  
Jesús Peláez ◽  
Jorge Cortés-Bretón Brinckmann ◽  
...  
Keyword(s):  
Digital Technologies ◽  
Hard Metal ◽  
Direct Metal Laser Sintering ◽  
Cobalt Chromium ◽  
Metal Ceramic ◽  
Marginal Discrepancy ◽  
Soft Metal ◽  
Manufacturing Techniques ◽  
Ceramic Restorations ◽  
To Receive

The introduction of new digital technologies represents an important advance to fabricate metal–ceramic restorations. However, few studies have evaluated the influence of these technologies on the fit of the restorations. The aim of this study was to evaluate the effect of different manufacturing techniques and pontic design on the vertical marginal fit of cobalt–-chromium (Co–Cr) posterior fixed partial dentures (FPDs) frameworks. Methods: Eighty stainless-steel dies were prepared to receive 3-unit FPDs frameworks with intermediate pontic (n = 40) and cantilever pontic (n = 40). Within each design, the specimens were randomly divided into four groups (n = 10 each) depending on the manufacturing technique: casting (CM), direct metal laser sintering (LS), soft metal milling (SM), and hard metal milling (HM). The frameworks were luted, and the vertical marginal discrepancy was assessed. Data analysis was made using Kruskal–Wallis and Mann–Whitney U tests (α = 0.05). Results: The vertical marginal discrepancy values of all FPDs were below 50 μm. The HM frameworks obtained the lowest misfit values in both designs. However, no differences were found among intermediate pontic groups or cantilevered groups. Likewise, when differences in a marginal discrepancy between both framework designs were analyzed, no differences were observed. Conclusions: The analyzed digital technologies demonstrated high precision of fit on Co–Cr frameworks and on both pontic designs.

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
Keyword(s):  
Cross Section ◽  
Selective Laser Sintering ◽  
Interface Strength ◽  
Noticeable Effect ◽  
Metal Ceramic ◽  
Dental Metal ◽  
Ceramic Restorations ◽  
Ceramic Interfaces

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.

scholarly journals MICROSCOPIC EVALUATION OF THE QUALITY OF DENTAL REPLACEMENT

2017 ◽  
Vol 8 ◽  
pp. 17-19
Author(s):  
Františka Pešlová ◽  
Daniela Koštialiková ◽  
Richard Veselý ◽  
Andrej Dubec ◽  
Maxim Puchnin
Keyword(s):  
Wide Spectrum ◽  
Permanent Tooth ◽  
Microscopic Evaluation ◽  
Metal Ceramic ◽  
Ceramic Crowns ◽  
Materials Used ◽  
The Aesthetic ◽  
Ceramic Crown ◽  
Real Challenge

<p>The permanent tooth replacements including metal-ceramic crowns are a convenient solution for the renewing of the original function of the whole set of teeth as well as of the natural appearance. Development and preparation of suitable tooth replacement presents a real challenge for dental engineers as the replacement has to meet all the conditions and requirements of the dental medicine as well as patient’s needs and wishes. The preparation of the metal-ceramic crown is a sophisticated process and the dental engineer has to prepare alwaysa unique replacement on demand. In dental medicine there is a wide spectrum of inorganic and organic materials used formanufacturing of dental replacements. Each of the material has specific properties leading to distinct applications.Besides the material properties, the attention has to be paid to the aesthetic function and biocompatibility of the material to ensure thecomplete restoration of the whole set of teeth.</p>

scholarly journals Analysis of the Mechanical Behavior and Effect of Cyclic Fatigue on the Implant-Abutment Interface

2020 ◽  
pp. 208-218
Author(s):  
Ramón Germán Sandoval ◽  
Marine Ortiz Magdaleno ◽  
Paula Sánchez Robles ◽  
Norma Zavala Alonso ◽  
Gabriel Fernando Romo Ramírez
Keyword(s):  
Mechanical Behavior ◽  
Compressive Stress ◽  
Three Dimensional ◽  
Cyclic Fatigue ◽  
Chromium Alloy ◽  
Fe Method ◽  
Manufacturing Technique ◽  
Significant Difference ◽  
Implant Abutment ◽  
Before And After

Purpose: The seal of the interface formed at the implant-abutment connection is essential for the long-term success of the implant-supported restoration. The aim of this study was to analyze the mechanical behavior and the effect of cyclic fatigue before and after in the marginal fit of implant-abutment according to the manufacturing technique of the abutment. Materials and methods: Machined titanium abutments (DENTIS), cast abutments with Nickel-Chromium alloy (VeraBond II), and manufacturing custom milled Zirconia abutments (Zirkonzahn) were evaluated. The implant-abutment assemblies were subjected to cyclic loads of 133 N at a frequency of 19.1 Hz for 200,000 cycles. The microgap was measured using Scanning Electronic Microscope and the distribution of compressive stress by the three-dimensional Finite Element (FE) method. Results: The microgap measurement values of the machined abutments were 1.62 μm and 1.92 μm, cast abutments were 14.14 μm, and 28.44 μm, and the milled abutments were 14.18 μm and 20.15 μm before and after cyclic fatigue, respectively. Only the cast abutments and the machined abutments showed a statistically significant difference before and after cyclic fatigue (p ≤ 0.05). The FE analysis showed that the critical areas of compressive stress were located at the implant-abutment connection, increasing in the cast abutments and decreasing in the milled and the machined abutments. Conclusion: Cyclic fatigue exerts an effect on the dimensions of the microgap at the implant-abutment interface before and after loading; this microgap depends of the type of abutment material and the manufacturing technique.

scholarly journals Materials and Manufacturing Techniques for Polymeric and Ceramic Scaffolds Used in Implant Dentistry

2021 ◽  
Vol 5 (3) ◽  
pp. 78
Author(s):  
Mutlu Özcan ◽  
Dachamir Hotza ◽  
Márcio Celso Fredel ◽  
Ariadne Cruz ◽  
Claudia Angela Maziero Volpato
Keyword(s):  
Biodegradable Polymers ◽  
Three Dimensional ◽  
Ceramic Materials ◽  
Polyglycolic Acid ◽  
Potential Interaction ◽  
Microstructure Fabrication ◽  
Manufacturing Techniques ◽  
Implant Dentistry ◽  
The Aesthetic ◽  
Hybrid Scaffolds

Preventive and regenerative techniques have been suggested to minimize the aesthetic and functional effects caused by intraoral bone defects, enabling the installation of dental implants. Among them, porous three-dimensional structures (scaffolds) composed mainly of bioabsorbable ceramics, such as hydroxyapatite (HAp) and β-tricalcium phosphate (β-TCP) stand out for reducing the use of autogenous, homogeneous, and xenogenous bone grafts and their unwanted effects. In order to stimulate bone formation, biodegradable polymers such as cellulose, collagen, glycosaminoglycans, polylactic acid (PLA), polyvinyl alcohol (PVA), poly-ε-caprolactone (PCL), polyglycolic acid (PGA), polyhydroxylbutyrate (PHB), polypropylenofumarate (PPF), polylactic-co-glycolic acid (PLGA), and poly L-co-D, L lactic acid (PLDLA) have also been studied. More recently, hybrid scaffolds can combine the tunable macro/microporosity and osteoinductive properties of ceramic materials with the chemical/physical properties of biodegradable polymers. Various methods are suggested for the manufacture of scaffolds with adequate porosity, such as conventional and additive manufacturing techniques and, more recently, 3D and 4D printing. The purpose of this manuscript is to review features concerning biomaterials, scaffolds macro and microstructure, fabrication techniques, as well as the potential interaction of the scaffolds with the human body.

RESULTS OF EVALUATION OF POSSIBLE ERRORS AND METHODS OF THEIR ELIMINATION AT THE STAGES OF MANUFACTURING METAL-CERAMIC DENTURES

2021 ◽  
pp. 54-62
Author(s):  
Жанна Владимировна Вечеркина ◽  
Наталья Витальевна Зайцева ◽  
Алина Александровна Смолина ◽  
Наталья Владимировна Примачева ◽  
Виктор Сергеевич Калиниченко
Keyword(s):  
Clinical Laboratory ◽  
Human Life ◽  
Dental Health ◽  
Orthopedic Treatment ◽  
Dental Technician ◽  
Metal Ceramic ◽  
Causes Of Errors ◽  
The Subject ◽  
Ceramic Restorations

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

scholarly journals Impact of rehabilitation with metal-ceramic restorations on oral health-related quality of 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 ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Oral Health ◽  
Life Quality ◽  
Ceramic Technology ◽  
World Health ◽  
Dental Ceramics ◽  
Metal Ceramic ◽  
Ceramic Restorations ◽  
The Impact

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.

scholarly journals Subjective Differences between Dentists and Patients about Relative Quality of Metal Ceramic Restorations placed in the Esthetic Zone

2017 ◽  
Vol 18 (2) ◽  
pp. 112-116 ◽  
Author(s):  
Khurshid A Mattoo ◽  
Faisal M Alkhayrat ◽  
Hussam A Madkhali ◽  
Ibrahim H Geathy ◽  
Mohammed AW Qahhar ◽  
...  
Keyword(s):  
Undergraduate Students ◽  
Academic Staff ◽  
Single Crown ◽  
Metal Ceramic ◽  
Ceramic Crowns ◽  
Relationship Of ◽  
Ceramic Restorations ◽  
The Relationship ◽  
Relative Quality

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

RESTORATION OF TEETH BASED ON THE CONCEPT OF «PRE-POLISHING OF THE COMPOSITE DENTIN LAYER”

2021 ◽  
pp. 43-50
Author(s):  
Kovalevsky A.M. ◽  
Vorobieva Yu.B. ◽  
Malysheva D.D.
Keyword(s):  
Composite Material ◽  
Classical Method ◽  
Surface Characteristics ◽  
Adhesive System ◽  
Dental Restoration ◽  
Layer By Layer ◽  
The Aesthetic ◽  
Long Term Preservation

After studying various methods of restoring teeth in the oral cavity, we came to the conclusion that no one technique is perfect. This article describes clinical cases, as well as laboratory studies that allow us to judge the effectiveness of dental restoration based on the concept of "pre-polishing of the dentin layer of the composite". The quality of the surface characteristics of the restorations of the anterior group of teeth made of pre-polymerization composite materials was analyzed. The aesthetic restoration of teeth was performed using the classical method of layer-by-layer application and photopolymerization of the composite, as well as the proposed method based on the concept of pre-polishing of the dentin layer of the composite material. After adequate anesthesia and odontopreparation, a portion of the composite material that recreates the dentine layer is introduced into a pre-prepared and isolated from the oral fluid cavity, adapted to the hard tissues of the tooth, and then photopolymerized with a dental lamp. Next, the created layer is polished to a mirror shine and re-adhesive treatment with a self-etching adhesive system, photopolymerization. The next transparent layer of the composite material, imitating enamel, is applied to the "petal" of the polished dentine (inner) layer of the material to the enamel-dentine border with the obligatory imitation of mamelon and the surface structure of the restored tooth and its cutting edge is formed in a generally accepted way. After the final photopolymerization, the final grinding and polishing is carried out. The proposed method of aesthetic restoration of teeth, based on the concept of pre-polishing the dentine layer of the composite material, allows you to achieve a higher quality of restoration, and guarantees long-term preservation of color, gloss and edge fit of the restoration of the frontal group of teeth.

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