FEATURES OF WORKING WITH DENTIN CERAMIC MASS IN THE MANUFACTURE OF METAL-CERAMIC DENTURES

2020 ◽  
pp. 104-110
Author(s):  
Наталья Витальевна Зайцева ◽  
Жанна Владимировна Вечеркина ◽  
Михаил Анатольевич Крючков ◽  
Виктор Сергеевич Калиниченко ◽  
Николай Валерьевич Морозов ◽  
...  
Keyword(s):  
Ceramic Coating ◽  
Scientific Work ◽  
Main Layer ◽  
Color Palette ◽  
Ceramic Mass ◽  
Hot Air ◽  
Metal Framework ◽  
Removable Denture ◽  
Metal Ceramic ◽  
Detailed Technique

Вопреки доказанным преимуществам автоматизации зуботехнической лаборатории с помощью компьютерных технологий, изготовление металлокерамическмх несъемных коронок и мостовидных протезов остается востребованным в ортопедической стоматологи видом конструкции. Большой клинический опыт, отработанные технологии, надёжность и относительная простота изготовления дают им неоспоримые положительные качества. И главным моментов, определяющим их качество, долговечность и эффективность заключается в опыте, тандеме работы врача стоматолога-ортопеда и зубного мастера, и конечно же в грамотности выполнения пошаговой последовательности керамического моделирования облицовки выбранной комбинированной конструкции. Изготовление металлокерамических коронок небольшой толщины требует от зубного техника владения различными методиками нанесения керамической облицовки, знаний свойств и особенностей масс мировых производителей, тщательного соблюдения всех этапов и грамотной работы с цветовой палитрой. Создание металлокерамической конструкции предполагает последовательное получение металлического каркаса, на которй в последующем послойно наносят керамическую массу, а затем проводят ее обжиг. Среди технологических операций при создании облицовки цельнолитого металлического каркаса несъемного протеза из металлокерамики следует веделить следующие аспекты: подготовка каркаса протеза, выбор, подготовка и нанесение керамической массы, моделирование и обжиг грунтового слоя, нанесение дентинной массы, этап глазурирования. В научной работе, проведенной сотрудниками кафедры пропедевтической стоматологии ранее, дана характеристика методов моделирования керамической массы, были подробно изложены основные аспекты по обработке керамической массы горячим воздухом, формированию основного слоя керамического покрытия. В последующем, убедившись в высоком качестве грунтового покрытия, переходят к моделированию и обжигу дентинного слоя керамики. В данной статье описана подробная техника нанесения компоненотов керамических масс на опаковой слой керамической массы. Представленный метод трехэтапного нанесения керамического покрытия при изготовлении металлокерамических зубных протезов отвечает всем требованиям моделирования керамики. Следует обратить внимание на точное соблюдение правил послойного нанесения и конденсации керамических масс. Нанесение отдельных слоев керамической массы предполагает наличие опыта у зубного техника Despite the proven advantages of dental laboratory automation using computer technologies, the production of metal-ceramic fixed crowns and bridges remains a popular type of construction in orthopedic dentistry. Extensive clinical experience, proven technologies, reliability and relative ease of manufacture give them undeniable positive qualities. And the main factor that determines their quality, durability and effectiveness is the experience, the tandem work of the dentist-orthopedist and dental master, and of course the literacy of performing a step-by-step sequence of ceramic modeling of the selected combined structure. The production of metal-ceramic crowns of small thickness requires the dental technician to know various methods of applying ceramic cladding, to know the properties and features of the world's leading manufacturers, to carefully observe all stages and to work correctly with the color palette. The creation of a metal-ceramic structure involves the sequential production of a metal frame, on which the ceramic mass is subsequently applied in layers, and then it is fired. Among the technological operations when creating the veneer-cast metal framework removable denture-metal should be wadelite the following aspects: preparation of a denture, the choice, preparation and application of the ceramic mass, the modeling and firing the base coat, applying the dentinal mass, the stage of glazing applications. In the scientific work carried out by the staff of the Department of propaedeutic dentistry earlier, the characteristic of methods for modeling the ceramic mass was given, the main aspects of processing the ceramic mass with hot air, and the formation of the main layer of the ceramic coating were described in detail. After making sure that the high quality of the ground coating is used, they proceed to modeling and firing the dentin layer of ceramics. This article describes a detailed technique for applying ceramic mass components to the opaque layer of the ceramic mass. The presented method of three-stage application of ceramic coating in the manufacture of metal-ceramic dentures meets all the requirements of modeling ceramics. You should pay attention to the exact observance of the rules of layering and condensation of ceramic masses

Specific features of structuring of the main layer of a metal-ceramic coating

2011 ◽  
Vol 441 (1) ◽  
pp. 350-353 ◽  
Author(s):  
N. A. Rudenskaya ◽  
G. P. Shveikin ◽  
M. V. Rudenskaya
Keyword(s):  
Ceramic Coating ◽  
Main Layer ◽  
Metal Ceramic

scholarly journals ANALYSIS ON THE PATTERN OF USING THE SERVICE OF REMOVABLE PARTIAL DENTURE MAKING IN A DENTAL LABORATORY IN SURABAYA

2017 ◽  
Vol 52 (4) ◽  
pp. 270
Author(s):  
Okti Setyowati ◽  
Endang Kusdarjanti
Keyword(s):  
Dental Health ◽  
Class Ii ◽  
Class I ◽  
Class Iii ◽  
Removable Partial Denture ◽  
Partial Denture ◽  
Metal Framework ◽  
Removable Denture ◽  
Class Iv

The making of removable denture is performed by a dental laboratory. To facilitate the identification, according to Kennedy classification, classes are divided onto groups, the Kennedy class I, II, III and IV. To suit with the needs of the dental laboratory tasks commonly done, priority are necessary for common cases and should to be taught to students of Dental Health Technology Diploma. In Surabaya, research of various cases of removable partial denture with the various Kennedy classifications has never been done before. This study was to analyze the pattern of service for the removable partial denture manufacture in dental laboratory at Surabaya (2011 – 2013). The research is an observatory analytic. The population is all dental laboratories located around the campus of the Faculty of Dentistry Airlangga University Surabaya. The sample was the whole population is willing to become respondents. Sampling by total sampling. The method of collecting data using secondary data from a dental laboratory in Surabaya from 2011 until 2013. The note is cases removable denture according to the classification of Kennedy that Kennedy Class I, II, III and IV. Also of note kinds of materials used to make the denture base that is heat cured acrylic resins, thermoplastic resins and metals coherent. The data is a compilation table charting the frequency until needed, then analyzed using cross tabulation. Mostly denture type is flexible type and the least is metal framework. Most cases by classification Kennedy is followed by class II class III and class II and more recently is the fourth. In conclusion, in 2011 and 2013 the manufacture of removable partial dentures according to the classification of Kennedy Class III is the most common in both the upper arch and lower jaw, followed by Class II, Class I and Class IV. In 2012 which is the highest grade III followed by class II, class IV and class I. The denture type most used is a flexible denture, followed acrylic denture and the last is the metal framework.

Experience with metal/ceramic coating in stationary gas turbines

1995 ◽  
Vol 76-77 ◽  
pp. 86-94 ◽  
Author(s):  
A.S. Osyka ◽  
A.I. Rybnikov ◽  
S.A. Leontiev ◽  
N.V. Nikitin ◽  
I.S. Malashenko
Keyword(s):  
Gas Turbines ◽  
Ceramic Coating ◽  
Metal Ceramic

A Study on Metal-Ceramic Interface on Metal Base Dental Alloys

2015 ◽  
Vol 638 ◽  
pp. 14-19 ◽  
Author(s):  
Marian Miculescu ◽  
Marin Bane ◽  
Florin Miculescu ◽  
Lucian Toma Ciocan ◽  
Oana Preda ◽  
...  
Keyword(s):  
Chemical Elements ◽  
Dental Alloys ◽  
Hybrid Layer ◽  
Sintered Ceramic ◽  
Metal Base ◽  
Ceramic Mass ◽  
Metal Ceramic ◽  
Microscopy Analysis ◽  
Composition Properties ◽  
Ceramic Crown

Although the literature describes many studies that attempt to define and interpret the interaction between the metal component and overlying sintered ceramic mass, researchers still have conflicting opinions. It is not yet fully understood the hybrid layer occurrence phenomenon that rises by diffusion at the sintering temperature between the compositional elements of the alloy and the ceramic mass. Also, there isn’t a standardized technology test for the compatibility between the alloy for this technology and a specific plating ceramic mass, from the strength of the bond between the two components at the interface point of view.This paper aims to present the composition, properties and the interaction between the two materials that participates in obtaining metal-ceramic fixed prostheses, and tries to expose a possible method for analysing the bonding strength and compatibility between dental alloys and ceramic masses. However, the mechanical surface contamination by the migration of the chemical elements it is possible, due to the mechanical stresses during cutting and polishing due to the hardness differences between the prosthesis components.Electron microscopy analysis allows the diffusion phenomenon evaluation and of the fact that the elements with reduced concentration within the ceramic have a higher diffusivity (Al as compared with Si), and that metallic elements diffuse in the ceramic mass. The extent of this interdiffusion is probably the degree of adhesion between the two components of the mixed metal-ceramic crown.

The Effect of Cooling Times on the Bonding Between Porcelain and Metal Alloys Fabricated by Different Techniques: In Vitro Study

2021 ◽  
pp. 232020682110371
Author(s):  
Emine Ünal ◽  
Faik Tugut
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Laser Sintering ◽  
Cobalt Chromium ◽  
Slow Cooling ◽  
Ceramic Samples ◽  
Metal Framework ◽  
Metal Ceramic ◽  
Bond Strengths ◽  
Fast Cooling

Aim: The aim of this study was to evaluate the effect of different cooling times on shear bond strength between cobalt–chromium metal frameworks fabricated by different techniques and veneering porcelain. Materials and Methods: One hundred twenty cobalt–chromium metal ceramic samples were obtained by three different techniques (casting, milling, and laser sintering). During the porcelain firing, fast and slow cooling protocols were applied. Ten specimens from each group were determined for all groups. The shear bond strength of the metal ceramic samples was measured by a universal testing machine with a constant crosshead speed of 0.5 mm/min. One sample from each group was evaluated by the scanning electron microscopy analysis in terms of surface change and fracture morphology. Variance analysis and Tukey test were used to analyze statistically significant differences between groups. Results: It was seen that the difference between the bond strengths of the metal frameworks obtained by different techniques was statistically significant ( P < .05). All groups except for difference between the bond strengths of all the frameworks metal groups with G-Ceram porcelain were statistically significant ( P < .05). The best bond strengths that were statistically significant were fast cooling G-Ceram (19.65 ± 2.65 MPa) with metal frameworks fabricated by laser sintering, fast cooling with metal framework fabricated by milling Noritake (19.17 ± 2.91 MPa), and the metal framework fabricated by casting was found to be slow cooling Noritake (12.99 ± 2.08 MPa) were seen. Conclusion: The porcelain cooling times had significant effect on the shear bond strength of porcelain to casting, milling and laser sintering alloys.

Understanding Mechanical Integrity of Metal/Ceramic Interfaces Through In-Situ Micro Mechanical Testing and Multiscale Simulations

2018 ◽  
Author(s):  
Xiaoman Zhang ◽  
Yang Mu ◽  
Shuai Shao ◽  
Collin Wick ◽  
Ramu Ramachandran ◽  
...  
Keyword(s):  
Mechanical Testing ◽  
Density Functional ◽  
Ceramic Coating ◽  
Minimum Energy ◽  
Shear Loading ◽  
Interfacial Region ◽  
Loading Conditions ◽  
Metal Ceramic ◽  
Ceramic Interfaces

Mechanical failures of interfacial regions of ceramic-coating/metal-adhesion-layer/substrate systems were measured quantitatively and observed concurrently through instrumented microscale mechanical testing in-situ a scanning electron microscope (SEM). Failure of the interfacial regions of coating/interlayer/substrate systems was observed in micro-pillar specimens in-situ under different loading conditions, including shear, compression, and tension. Under shear loading, shear failure of the interfacial region was observed to occur in two stages: an initial uniform shear plastic deformation of the entire metal interlayer followed by an unstable shear-off close to the metal/ceramic interface. Additional testing under compression loading conditions suggests that the unstable shear-off is concomitant with the metal/ceramic interface going from being “locked”, with no relative displacement between materials on the two sides of the interface, to being “unlocked”, with significant relative displacements. Failure of the interfacial region was also observed under tensile loading conditions. Density functional theory (DFT) and molecular dynamics (MD) studies on one particular metal/ceramic interface, namely Ti/TiN, showed that a weak interaction plane exists in the metal layer near the chemical interface in a coherent Ti/TiN structure. Consequently, the free energy and theoretical shear strength of the semi-coherent Ti/TiN interface is found to depend on the physical location of the misfit dislocation network (MDN). The minimum energy and strength of the interface occur when the MDN is near, but not at the chemical interface. The present work gives new insight into the nature of mechanical failure of metal/ceramic interfaces, is relevant to materials-based engineering of metal/ceramic interfaces, and has applications to engineering of ceramic coating/substrate systems.

Bond between single artificial teeth and the base plate in removable denture metal framework

2018 ◽  
Vol 1 (90) ◽  
pp. 11-21 ◽  
Author(s):  
J. Taczała ◽  
J. Sawicki
Keyword(s):  
Base Plate ◽  
Acrylic Resin ◽  
Denture Base ◽  
Partial Denture ◽  
Metal Framework ◽  
Denture Plate ◽  
Removable Denture ◽  
Metal Frame ◽  
Artificial Teeth ◽  
Scientific Achievements

Purpose: The purpose of this paper is to analyse attempts at improving the bond between acrylic artificial teeth and the denture base plate - considered in the context of single incisors in framework denture. Design/methodology/approach: It is a review article focusing on the analysis of state of the art in the field of the bond between the polymerised acrylic (teeth) and the polymerising acrylic resin during the production of denture (denture plate). Previous works regard the issue of individual incisor teeth (both upper and lower) breaking off from the metal partial denture. Findings: The bond between artificial acrylic teeth and the acrylic denture plate of the prosthesis was discussed. Ways of improving this bond were also presented. Although researchers and companies offer many methods for improving this bond, none of them refer directly to the issue discussed in this article. In conclusion- the hitherto scientific achievements work well in the case of acrylic prostheses without a metal frame, which constitutes an obstacle for achieving the effect required. In this work, it is suggested that further research would not only develop and provide more detail on the issue of the bond between artificial teeth and the denture plate, but also solve the problem appearing in cases of metal partial denture. Originality/value: This article shows a significant problem that hasn’t been discussed in detail in the past.

Analysis of Fracture Behavior of Metal/Ceramic Functionally Graded Materials under Thermal Stress

2013 ◽  
Vol 750-752 ◽  
pp. 2200-2205 ◽  
Author(s):  
Cheng Fan
Keyword(s):  
Functionally Graded Materials ◽  
Fracture Behavior ◽  
Crack Formation ◽  
Ceramic Coating ◽  
Process Analysis ◽  
Failure Process ◽  
Functionally Graded ◽  
Graded Materials ◽  
Crack Morphology ◽  
Metal Ceramic

In this presented work, a coupled thermo-mechanical model is employed to analyze the thermo-mechanical behavior of ceramic functionally graded materials (FGMs) and the crack formation and propagation process of ceramic coating was simulated step in step and step by step using the RFPA (Realistic Failure Process Analysis) 2D-Thermo code. The thermal shock fracture behavior is discussed based on the basis of the simulated crack morphology and elucidated the mechanism of crack deformation and crack propagation. The state change from compression to tension whose magnitude is large enough to exceed the tension strength of ceramic causes the vertical crack. The numerical results agreed well with the experimental results in the previous literature.

scholarly journals Mahkota teleskopik sebagai retainer alternatif gigitiruan lepasan Telescopic crown as alternative retainer of removable denture

2013 ◽  
Vol 12 (2) ◽  
pp. 123
Author(s):  
Sri W. Rais ◽  
Setyawan Bonifacius
Keyword(s):  
Case Report ◽  
Removable Partial Denture ◽  
Partial Denture ◽  
Metal Framework ◽  
Removable Denture ◽  
The Aesthetic

In making removable denture, some aspects must be considered: retention, stabilization, support, comfort, andaesthetic. Retention plays an important role in the success of a removable denture. Retention can be obtained from theundercut area, or friction of the denture’s components to the abutment or abutment. Clasp as a retainer, both of metalcasting and wire have been frequently used in the removable partial denture. The clasp has some shortcomings in itsusing, namely color of the metal can sometimes interfere with the aesthetic of the wearer and cannot be placed on teeththat have experienced extensive caries. Telescopic crown as retainer has several advantages, which can be used oncrown of abutment that has experienced extensive caries or tooth that will be an abutment but have endodontic-treated.On telescopic crowns, retention is obtained from the friction between the primary crowns against secondary crown thatserves as a retainer. This case report describes two cases of a removable denture with a metal framework using atelescopic crown on one tooth that serves as a retainer in the case of one-side free-end edentulous.

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