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What is a mechanical amalgamator?
An amalgamator is a mechanical apparatus designed to triturate balanced proportions of liquid mercury and metal alloy to produce silver amalgam restorative material. Trituration is the mechanical mixing of mercury and dental alloy resulting in their amalgamation.
What is amalgamation in dentistry?
The reaction between mercury and alloy when mixed together is termed an amalgamation reaction. It will result in the formation of a silver-grey workable mass which can be condensed into cavities. After condensing, the dental amalgam is carved to generate the required anatomical features and then hardens with time.
What is the purpose of trituration amalgam in a amalgamator?
Mechanical Trituration. The objective of trituration is to provide proper amalgamation of the mercury and alloy. There is always an oxide layer of the alloy surface that hinders diffusion of mercury into the alloy. This film must be disrupted so that a clean surface of alloy can make intimate contact with the mercury.
What is the function of amalgamator?
A dental amalgamator is used in the field of dentistry for the blending of restorative materials such as silver amalgam capsules and glass ionomer. A modern amalgamator is a computerized mixing system that works under the control of a microprocessor. This ensures a precise, controlled, and consistent mix.
How do you use amalgamator?
How do you pronounce amalgamator?
What are the objectives of trituration procedure?
The object of trituration is to provide proper amalgamation of the mercury and alloy. The alloy particles are coated with a film oxide that is difficult for the mercury to penetrate. This film must be rubbed off so that a clean surface of alloy can come in contact with mercury.
What is Mercuroscopic expansion?
Mercuroscopic Expansion: Release of mercury from γ2 phase during electrochemical corrosion results in additional formation of phases on reaction with unreacted γ phase, causing further expansion.
Which type of amalgam is used for dental filling?
Approximately half of a dental amalgam filling is liquid mercury and the other half is a powdered alloy of silver, tin, and copper. Mercury is used to bind the alloy particles together into a strong, durable, and solid filling.
How do you prepare a Class 2 cavity?
Envision the cavity preparation outline and extent:
- Always keep the bur perpendicular to the long axis of the tooth.
- Follow the anatomical grooves of the tooth
- Leave a small “enamel shell” interproximally to protect the adjacent tooth from iatrogenic damage.
What happens if you over Triturated amalgam?
Over trituration will results in: 1) Fast setting as a result of rapid Hg consumption and crystallization. 2) The mix appears homogenous, but less plastic and hence improperly condensed and adapted to cavity walls. 3) Over triturated amalgam exhibits less setting expansion or insignificant contraction.
What is amalgam creep?
In testing of dental amalgam, creep refers to the deformation of an amalgam under a compressive stress of 36 MPa of a 7 d old specimen (ISO, International Or- ganization for Standardization’s proposal for International Standard 1559).
What is the Eames technique?
(ēmz tek-nēk) A procedure for mixing dental amalgam in approximately a 1:1 ratio of mercury and alloy to minimize free mercury in the unset mix.
Which is the strongest phase in amalgam?
gamma phase The first phase, called the gamma phase (γ), is the silver alloy phase. It is the strongest phase and has the least corrosion. The second phase is the gamma-1 phase (γ1) consisting of mercury reacting with the silver. It is strong and corrosion resistant, although not as resistant as the gamma phase.
What is pharmacy Trituration?
(Pharmaceutical: Processes) A trituration is a mixture of one or more finely ground powdered drugs. The trituration is a mix of a finely ground drug and lactose.
What is hygroscopic expansion?
When additional water is brought into contact withthe setting material, an increased. expansion is observed. This latter expansion has been termed “hygroscopic expansion.”
What causes amalgam creep?
The stresses that induce creep may arise from the continued setting expansion of the amalgam, the formation of corrosion products, mastication, or from the thermal expansion of the amalgam during ingestion of hot foods. The latter two are low-frequency cyclic stresses.
What is high copper alloy?
There are two basic types of high copper alloy: (a) mixtures of ‘spherical’ silver/copper or silver/tin/copper particles with low copper low copper lathe-cut or ‘spherical’ and (b) single composition silver/tin/copper spherical or lathe-cut particles.
Which material is best for teeth filling?
Which Dental Filling Material Should You Choose?
- Composite. Composite fillings are very popular among patients.
- Amalgam. Dentists have been using amalgam fillings for decades.
- Gold. A good filling is made of gold that is combined with other metals.
- Resin or glass ionomer.
What is the best material for tooth filling?
One of the most common and durable tooth fillings is amalgam (silver) fillings. Dentists have used this type of filling for many years, especially on back teeth. This type of filling is very durable and can withstand chewing pressure for well over a decade.
What is a Class 2 restoration?
A Class II restoration has to recreate not only the natural contour of the tooth, but also the corresponding proximal contact. Many dentists consider this point, in particular, to be the most demanding part of the treatment.
What is a Class 2 cavity?
Class II cavities Class II carious lesions occur on proximal surfaces of premolars and molars. They may occur in combination with occlusal (Class I) caries or they may occur alone. In situations where the presence of caries is on the occlusal as well as the proximal surface, a two-surface cavity is prepared.
How many point angles are in a class 2 cavity?
For class II cavity preparation (mesioocclusal or disto-occlusal) 11 line angles and 6 point angles are as follows. The following is the nomenclature for mesio-occlusal cavity (Fig.