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Which type of impression material is the only one that presents a hydrophilic character?
What is the setting time range for medium viscosity Polyvinyl Siloxane (Addition Silicone) impression material?
Which impression material has a tearing strength between 1800-4800 N/m?
What is the contraction percentage after 24 hours for high viscosity Polyvinyl Siloxane (Addition Silicone) impression material?
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Which impression material has a contact angle of 82º?
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What is the auto-mixing characteristic of high viscosity Polyvinyl Siloxane (Addition Silicone) impression material?
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Which impression material has the highest hardness value?
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Which impression material has the potential for maximum distortion while removing from the mouth?
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Which type of impression material is associated with the by-product after the setting reaction?
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What is the main feature of A-type silicone impression material in terms of dimensional stability and elastic recovery?
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In which situations can polyether impression material be preferred depending on its rigidity?
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What is the specific topic of the course taught by Assoc. Prof. Dr. Özay Önöral?
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Which book is referenced for the course taught by Assoc. Prof. Dr. Özay Önöral?
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What is the duration of the course on Impression Materials in Fixed Prostheses?
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What is the specific learning outcome related to elastomeric impression materials?
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'Defend the selection' is associated with which specific learning outcome?
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'Associate the dimensional stability with the by-product after the setting reaction' is a specific learning outcome related to which type of impression material?
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'Define in which situations it can be preferred depending on its rigidity' is a specific learning outcome related to which type of impression material?
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What causes the excessive shrinkage of condensation silicones?
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What is the function of fillers in condensation silicones?
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Which elastomeric impression material is recommended to cover hard and soft tissue surfaces with a surface-active spray before the impression process?
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Which material among elastomeric impression materials shows the best elastic recovery feature?
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Which type of silicone composition releases hydrogen gas as a by-product when reacting with moisture in the medium?
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Which elastomeric impression material requires the use of an individualized tray and tray adhesive?
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Which elastomeric impression material is not recommended to be contacted with latex and rubber-dam due to its contamination with sulfur compounds?
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What characteristic makes addition silicone different from condensation silicones in terms of setting reaction by-products?
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Which elastomeric impression material has a wide viscosity option and is suitable for taking impressions with a prefabricated tray?
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Which elastomeric impression material can be stored for several weeks and poured again?
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What is the primary function of elastic recovery in impression materials?
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Which feature of elastomeric impression materials allows them to record surface details very clearly compared to hydrocolloids?
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What is the role of contact angle and wettability in the performance of impression materials?
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In elastomeric impression materials, what is the significance of viscosity?
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Which characteristic makes hydrophilic materials preferable for impression recording?
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What is the primary purpose of the lead dioxide in the catalyst paste of polysulfide impression materials?
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Which property allows thixotropic materials to remain stable when applied to the tooth surface with an injector?
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What distinguishes polyvinyl siloxane and polyether as the most preferred elastomeric impression materials today?
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Which characteristic makes polysulfide suitable for creating impressions in the presence of saliva and blood?
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What is the main function of tear strength in elastomeric impression materials?
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What is the significance of the contact angle and wettability in impression materials?
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What is the role of the lead dioxide in the catalyst paste of polysulfide impression materials?
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What makes polysulfide impression materials suitable for creating impressions in the presence of saliva and blood?
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What distinguishes polyvinyl siloxane from polyether in terms of their setting reaction by-products?
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What is the primary purpose of the fillers in condensation silicones?
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What is the specific feature of thixotropic impression materials that allows them to remain stable when applied to the tooth surface with an injector?
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What is the significance of the flexibility of elastomeric impression materials?
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What distinguishes silicone-polyether hybrid material (vinyl polyether silicone) from other elastomeric impression materials?
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What are the four types of silicone elastomers used in dentistry?
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What are the prominent features of A-type silicone impression material in terms of dimensional stability and elastic recovery?
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Which elastomeric impression material is recommended for creating impressions in the presence of saliva and blood?
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What is the specific function of lead dioxide in the catalyst paste of polysulfide impression materials?
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What is the contact angle of the high viscosity Polyvinyl Siloxane (Addition Silicone) impression material?
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What is the primary purpose of fillers in condensation silicones?
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Which elastomeric impression material has the potential for maximum distortion while removing from the mouth?
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What is the contraction percentage after 24 hours for medium viscosity Polyvinyl Siloxane (Addition Silicone) impression material?
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Which elastomeric impression material is not recommended to be contacted with latex and rubber-dam due to its contamination with sulfur compounds?
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What is the specific learning outcome related to elastomeric impression materials?
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What is the specific topic of the course taught by Assoc. Prof. Dr. Özay Önöral?
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What are the two main reasons for the weak dimensional stability of condensation silicones?
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What is the setting reaction by-product of addition silicone (polyvinyl siloxane)?
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What is the composition of the base paste in polyether impression material?
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What are the components of the catalyst paste in polyether impression material?
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What is the function of the fillers in the condensation silicones?
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What is the recommended waiting time before pouring plaster into addition silicone (polyvinyl siloxane) impressions?
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Why is it important to cover hard and soft tissue surfaces with a surface-active spray before taking an impression with addition silicone (polyvinyl siloxane)?
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What are the two main components of the addition silicone (polyvinyl siloxane) composition?
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What is the role of the tin compound in the catalyst paste of condensation silicones?
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What is the specific learning outcome associated with the selection of polyether impression material?
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Which elastomeric impression material is the only one that presents a hydrophilic character?
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What is the primary function of the lead dioxide in the catalyst paste of polysulfide impression materials?
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What is the role of contact angle and wettability in the performance of impression materials?
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What causes the excessive shrinkage of condensation silicones?
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Which impression material has the highest hardness value?
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What is the setting time range for medium viscosity Polyvinyl Siloxane (Addition Silicone) impression material?
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What is the auto-mixing characteristic of high viscosity Polyvinyl Siloxane (Addition Silicone) impression material?
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In which situations can polyether impression material be preferred depending on its rigidity?
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What is the primary purpose of the fillers in condensation silicones?
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In elastomeric impression materials, what is the significance of viscosity?
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List the properties of polysulfite impression material, associate the dimensional stability with the by-product after the setting reaction.
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List the properties of ______ impression material, define its existing forms, associate the dimensional stability with the by-product after the setting reaction.
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List the properties of ______ impression material, explain the prominent features of the material in terms of dimensional stability and elastic recovery, and define its existing forms.
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List the properties of the ______ impression material, explain the prominent features of the material in terms of dimensional stability and elastic recovery, define in which situations it can be preferred depending on its rigidity and present its existing forms.
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What is the duration of the course on Impression Materials in Fixed Prostheses?
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What is the name of the Committee?
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What is the Topic of the Course?
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What is the Course ID Code of Committee?
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What is the name of the book?
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Who is the Lecturer?
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In the hardening reaction, ______ is released as a by-product and causes mass loss of the material.
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The filler in the catalyst paste of condensation silicones contains an alkyl silicate, the cross-linking agent, and the tin compound acting as an ______.
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When two pastes of addition silicones are mixed, the platinum acts as a ______, and the addition (addition type) reaction begins.
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Polyether impression material contains ethylene oxide copolymer and silica filler in the ______ tube.
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The platinum salt in the catalyst of addition silicones acts as an ______.
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The large tube of polyether impression material is a base and contains ethylene oxide copolymer and ______ filler.
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The small tube of polyether impression material is a catalyst and contains aromatic sulfonic acid ester, silica filler, oil, and ______ that all initiate crosslinking.
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The residual polymethyl hydroxy siloxane in addition silicones reacts secondarily with moisture in the medium and produces ______ gas.
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A less hydrophobic material with improved wettability has been developed in addition silicones by introducing nonionic surfactants to reduce ______.
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The high viscosity of addition silicones allows for the transfer of some of the mixture to the injector, resulting in more accurate impressions by injecting the material directly into the relevant region before placing the ______ in the mouth.
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It is a mono-phase impression material that generally uses a single viscosity material. It has high accuracy and dimensional stability. Elastic recovery is good. When it sets, it has high rigidity and it is difficult to remove it, especially in the presence of an undercut. It gives surface details very clearly. There is no need to make an individualized tray; Impressions are taken with a non-perforated prefabricated tray, and spoon adhesive should be used. Its cost is higher than other elastomeric materials. The impression material described in the text is a _______ impression material.
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Polyvinyl Siloxane (Addition Silicone) has a setting time range for medium viscosity of _____ to _____ minutes.
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The contraction percentage after 24 hours for high viscosity Polyvinyl Siloxane (Addition Silicone) impression material is _____ to _____ %.
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The tearing strength of Polyvinyl Siloxane (Addition Silicone) impression material is between _____ to _____ N/m.
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Polyether impression material is recommended to cover hard and soft tissue surfaces with a surface-active spray before the impression process, especially in the presence of an undercut. This is due to its _____ characteristic.
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The specific learning outcome 'Associate the dimensional stability with the by-product after the setting reaction' is related to _____ impression material.
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The elastomeric impression material that is the only one that presents a hydrophilic character is _____ material.
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The elastomeric impression material that has the potential for maximum distortion while removing from the mouth is _____ material.
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The auto-mixing characteristic of high viscosity Polyvinyl Siloxane (Addition Silicone) impression material is _____.
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Polysulfide impression material has a tearing strength of _____ to _____ N/m.
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Elastic recovery: It is the ability to return the impression material to its original size without distortion during removal from the mouth. For the impression material not to be distorted, its minimum thickness should be 3-4 times the ______ depth.
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Dimensional accuracy: How closely the impression material reproduces the details of the patient’s mouth. Dimensional stability: It is the feature that the accuracy of the material does not change over time. It is the percentage of shrinkage or expansion of the material. Some materials have a longer time, with a poured cast remaining accurate up to two weeks, whereas others last just two hours or less. It is an essential consideration depending on how soon a cast will poured. Contact angle and wettability: The angle formed between the tangent line of the drop formed by the liquid on the solid surface and the solid surface is called the contact angle. Hydrophilic/hydrophobic character (Hydrophilicity/Hydrophobicity): If the material is hydrophilic in character, it shows fluidity in a humid environment and can be worked comfortably, thus giving an accurate measurement. While hydrophilic materials show a low contact angle, hydrophobic materials have a contact angle greater than 90º. Hydrophilic materials record the surface with high precision and create fewer air bubbles during gypsum model obtainment due to their wettability properties. Fluidity and thixotropic property: Wettability and fluidity allow the material to give fine details. Materials with low wetting angles have more fluidity, are less affected by oral fluids, and give a clearer impression. The thixotropic feature is that the material has low fluidity under gravity but high fluidity under pressure. Thixotropic materials remain stable when applied to the tooth surface with an injector, but when they come on materials with a dense consistency, they show fluidity towards the sulcus. Viscosity: The viscosity of a liquid is its resistance to fluidity. The low viscosity material gives good detail, but the material cannot support itself. Therefore, it is not recommended to be used alone, it should be used with a higher viscosity material. Flexibility: Ease of removal from the mouth after setting. If the material is stiff, it is considered less flexible. Ease of handling: The “how it works in my hands” characteristic inherent in how clinicians choose dental materials. Features that affect ease of handling include viscosity and the ______ time/set time ratio. Near East University, Faculty of Dentistry 3 Assoc. Prof. Dr. Özay ÖNÖRAL Tear strength: Likelihood of tearing when removed from the patient’s mouth. Materials with high tear strength are essential for an impression to capture a subgingival margin. ELASTOMERIC IMPRESSION MATERIALS Elastomeric impression materials are cross-linked polymers that show flexible properties when hardened. These materials stand out with their properties such as good accuracy and dimensional stability, and record surface details very clearly compared to hydrocolloids. There are 4 types of silicone elastomers: polysulfide, condensation silicone, addition silicone, and polyether. Polysulfide is the first elastomeric impression material used in dentistry (1950). In the following years, condensation silicones (1955), polyether (1965), and polyvinyl siloxane (1975) entered the dental market. The most preferred materials today are polyvinyl siloxane and polyether. Silicon-polyether hybrid material (vinyl polyether silicone) (2009) which has been recently developed has not yet found widespread use. Elastomeric impression materials consist of base and catalyst pastes. They have different density options (extralow, low, medium, high, very high [putty]) with respect to the amount of filler they contain. Materials with different densities can be preferred according to their intended use. Low-density material gives a more detailed Near East University, Faculty of Dentistry 4 Assoc. Prof. Dr. Özay ÖNÖRAL and clear impression, but polymerization shrinkage during hardening is higher. Low and high-density materials can be used in combination. Polysulfide Composition: It is available in two paste forms, base and catalyst. The base paste contains poly-sulfide polymer, a filler (titanium dioxide) to increase resistance, a plasticizer to provide proper viscosity, and 0.5% sulfur as an accelerator. The catalyst paste contains lead dioxide, filler, a plasticizer, and oleic or stearic acid as retarders to control the setting reaction. The base paste is white, while the catalyst paste is brown, which is the characteristic color of the lead dioxide. The contrasting colors of the pastes help to understand that they are mixed homogeneously. Setting reaction: When the two pastes are mixed, the terminal groups of the polymer chain react with lead dioxide and cross-linking occurs by extending the chain. In each reaction step, a water molecule appears as a byproduct, which weakens the dimensional stability of the material. As the chain elongation continues, the viscosity increases. When the crosslinking reaches a certain level, the material begins to show elastic properties. Characteristics: It is low-medium hydrophilic; can give the correct impression in the presence of saliva and blood. Tear resistance is high.
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Elastomeric impression materials are cross-linked polymers that show flexible properties when hardened. These materials stand out with their properties such as good accuracy and dimensional stability, and record surface details very clearly compared to ______.
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There are 4 types of silicone elastomers: polysulfide, condensation silicone, addition silicone, and ______.
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Polysulfide is the first elastomeric impression material used in dentistry (1950). In the following years, condensation silicones (1955), ______ (1965), and polyvinyl siloxane (1975) entered the dental market.
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The most preferred materials today are polyvinyl siloxane and ______.
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Elastomeric impression materials consist of base and catalyst pastes. They have different density options (extralow, low, medium, high, very high ______) with respect to the amount of filler they contain.
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Low-density material gives a more detailed and clear impression, but polymerization shrinkage during hardening is higher. Low and high-density materials can be used in ______.
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The base paste contains poly-sulfide polymer, a filler (titanium dioxide) to increase resistance, a plasticizer to provide proper viscosity, and 0.5% sulfur as an ______.
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The catalyst paste contains lead dioxide, filler, a plasticizer, and oleic or stearic acid as ______ to control the setting reaction.
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When the two pastes are mixed, the terminal groups of the polymer chain react with lead dioxide and cross-linking occurs by extending the chain. In each reaction step, a water molecule appears as a ______, which weakens the dimensional stability of the material.
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Study Notes
Impression Materials
- Hydrophilic character is presented only by Polyvinyl Siloxane (Addition Silicone) impression material.
- The setting time range for medium viscosity Polyvinyl Siloxane (Addition Silicone) impression material is 5 to 15 minutes.
- The tearing strength of Polyether impression material is between 1800-4800 N/m.
- The contraction percentage after 24 hours for high viscosity Polyvinyl Siloxane (Addition Silicone) impression material is 0.15 to 0.25%.
- Polyether impression material has a contact angle of 82º.
- High viscosity Polyvinyl Siloxane (Addition Silicone) impression material has an auto-mixing characteristic.
- Polyvinyl Siloxane (Addition Silicone) impression material has the highest hardness value.
- Polyether impression material has the potential for maximum distortion while removing from the mouth.
- Condensation silicone impression material is associated with the by-product after the setting reaction.
- A-type silicone impression material has a prominent feature of dimensional stability and elastic recovery.
Polyether Impression Material
- Polyether impression material can be preferred in situations depending on its rigidity.
- The specific learning outcome related to polyether impression material is to "define in which situations it can be preferred depending on its rigidity".
- Polyether impression material is recommended for creating impressions in the presence of saliva and blood.
Polyvinyl Siloxane (Addition Silicone) Impression Material
- The contact angle of high viscosity Polyvinyl Siloxane (Addition Silicone) impression material is 70º.
- The primary function of fillers in condensation silicones is to reduce the contraction of the material.
- Polyvinyl Siloxane (Addition Silicone) impression material has the potential for maximum distortion while removing from the mouth.
- The contraction percentage after 24 hours for medium viscosity Polyvinyl Siloxane (Addition Silicone) impression material is 0.1 to 0.2%.
Course Information
- The specific topic of the course taught by Assoc.Prof.Dr.Özay Önöral is Impression Materials in Fixed Prostheses.
- The referenced book is not specified.
- The duration of the course on Impression Materials in Fixed Prostheses is not specified.
- The specific learning outcome related to elastomeric impression materials is to "defend the selection".
Elastomeric Impression Materials
- The primary function of elastic recovery in impression materials is to allow the material to return to its original shape after removal from the mouth.
- The feature of elastomeric impression materials that allows them to record surface details very clearly compared to hydrocolloids is their ability to reproduce detailed surface anatomy.
- The role of contact angle and wettability in the performance of impression materials is to facilitate the flow of the material into the tooth surface and surrounding tissues.
- The significance of viscosity in elastomeric impression materials is to determine the flow and handling characteristics of the material.
- Hydrophilic materials are preferable for impression recording because they have improved wettability and can flow more easily into the tooth surface and surrounding tissues.
Condensation Silicones
- The excessive shrinkage of condensation silicones is caused by the release of hydrogen gas as a by-product when reacting with moisture in the medium.
- The function of fillers in condensation silicones is to reduce the contraction of the material.
- The two main reasons for the weak dimensional stability of condensation silicones are the release of hydrogen gas as a by-product and the contraction of the material.
Addition Silicones
- The setting reaction by-product of addition silicone (polyvinyl siloxane) is not specified.
- The primary purpose of fillers in condensation silicones is to reduce the contraction of the material.
- The recommended waiting time before pouring plaster into addition silicone (polyvinyl siloxane) impressions is not specified.
- It is important to cover hard and soft tissue surfaces with a surface-active spray before taking an impression with addition silicone (polyvinyl siloxane) to facilitate the flow of the material into the tooth surface and surrounding tissues.
- The two main components of the addition silicone (polyvinyl siloxane) composition are not specified.
Polysulfide Impression Material
- Polysulfide impression material is suitable for creating impressions in the presence of saliva and blood due to its ability to resist contamination and maintain its accuracy.
- The primary function of the lead dioxide in the catalyst paste of polysulfide impression materials is to act as a catalyst.
- The specific learning outcome associated with the selection of polysulfide impression material is to "associate the dimensional stability with the by-product after the setting reaction".
Thixotropic Impression Materials
- Thixotropic impression materials are characterized by their ability to remain stable when applied to the tooth surface with an injector, allowing for more accurate impressions.
- The specific feature of thixotropic impression materials that allows them to remain stable when applied to the tooth surface with an injector is their ability to change viscosity in response to changes in shear rate.
Silicone-Polyether Hybrid Material
- Silicone-polyether hybrid material (vinyl polyether silicone) is distinguished from other elastomeric impression materials by its unique combination of properties.
- The four types of silicone elastomers used in dentistry are not specified.
A-Type Silicone Impression Material
- The prominent features of A-type silicone impression material in terms of dimensional stability and elastic recovery are not specified.
- The specific learning outcome related to A-type silicone impression material is to "explain the prominent features of the material in terms of dimensional stability and elastic recovery".
Committee Information
- The name of the Committee is not specified.
- The name of the book is not specified.
- The Lecturer is Assoc.Prof.Dr.Özay Önöral.
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Description
Test your knowledge about mono-phase impression material used in dentistry, including its viscosity options and setting reaction process. This quiz is based on information from the Faculty of Dentistry at Near East University.
