Silicone Rubber Technologies Quiz

The byproduct is ethyl alcohol.

Tin compound, such as dibutyl tin dilaurate or tin octoate.

It can withstand up to 300% extension before tearing.

<p>It affects the physical properties, including elasticity and tear resistance.</p> Signup and view all the answers

<p>They are low molecular weight polymers that can be converted from flowable to non-flowable rubbers at room temperature through a polymerization reaction.</p> Signup and view all the answers

<p>The addition type, specifically vinyl silicone, is regarded as the best.</p> Signup and view all the answers

<p>Polysulfide, silicones (addition and condensation), and polyether.</p> Signup and view all the answers

<p>It indicates dimensional changes after setting due to alcohol loss or slow setting.</p> Signup and view all the answers

<p>Light consistency, regular consistency, and heavy consistency.</p> Signup and view all the answers

<p>Fillers enhance dimensional stability and tear strength while controlling the viscosity and consistency of the material.</p> Signup and view all the answers

<p>Yes, they can be disinfected without affecting their properties.</p> Signup and view all the answers

<p>Chloroplatinic acid is used as a catalyst.</p> Signup and view all the answers

<p>PbO2 acts as a catalyst for polymerization, while plasticizers modify the viscosity of the paste for desired consistency.</p> Signup and view all the answers

<p>They offer better dimensional stability, higher tear strength, and can be electroplated, although at a higher cost.</p> Signup and view all the answers

<p>The setting occurs through condensation polymerization and cross-linking, with water being eliminated as a byproduct.</p> Signup and view all the answers

<p>Crown and bridge impressions, and partial denture impressions.</p> Signup and view all the answers

<p>The two types are condensation type and addition type, differing primarily in their curing mechanisms due to different end groups.</p> Signup and view all the answers

<p>Increased temperature, presence of moisture, and an increase in the reaction ratio or catalyst can accelerate oxidation.</p> Signup and view all the answers

<p>Polysulfide possesses a molecular structure that allows for high resistance to tearing, achieving values up to 700%.</p> Signup and view all the answers

<p>Flexibility aids in removing the material from undercuts with minimal stress, essential for accurate dental impressions.</p> Signup and view all the answers

<p>Polysulfide exhibits low shrinkage (0.25%) over 24 hours and maintains dimensional stability, crucial for precise impressions.</p> Signup and view all the answers

<p>Disadvantages include a bad odor and taste, long setting time of 10-12 minutes, high deformation potential, and stickiness.</p> Signup and view all the answers

<p>Polysulfide can be disinfected by most antimicrobial solutions, such as hypochlorite, without adverse dimensional changes.</p> Signup and view all the answers

<p>A platinum catalyzed addition reaction occurs.</p> Signup and view all the answers

<p>It is critical because the polymerization reaction continues after setting, which could alter the impression's accuracy.</p> Signup and view all the answers

<p>There are no by-products produced during polymerization.</p> Signup and view all the answers

<p>Latex gloves contain powder that retards the reaction.</p> Signup and view all the answers

<p>The main difference is in their relative dimensional stability.</p> Signup and view all the answers

<p>Cationic ring opening addition polymerization occurs.</p> Signup and view all the answers

<p>A polyether polymer, a sulfonic acid ester catalyst, a filler, and a plasticizer.</p> Signup and view all the answers

<p>Viscosity increases along with the development of elastic properties.</p> Signup and view all the answers

<p>They are primarily used in crown and bridge applications.</p> Signup and view all the answers

<p>Polyether is the least flexible of all rubbers.</p> Signup and view all the answers

<p>Polyether shows very good dimensional stability with a polymerization shrinkage of 0.25% in 24 hours.</p> Signup and view all the answers

<p>Polyether is hydrophilic and absorbs water under high humidity conditions.</p> Signup and view all the answers

<p>They are primarily used for crown and bridge work.</p> Signup and view all the answers

<p>The reaction can produce either chain lengthening or crosslinking.</p> Signup and view all the answers

<p>Polyether has better tear resistance than silicone impressions but less than polysulfide.</p> Signup and view all the answers

<p>The thickness should be between 4-6 mm.</p> Signup and view all the answers

<p>Polyethers can be disinfected, but immersion in disinfectants longer than 10 minutes can cause dimensional changes.</p> Signup and view all the answers

<p>Silicone rubber types include Light, Regular, Heavy, and Putty variants.</p> Signup and view all the answers

<p>The main catalyst used in polyether rubbers is Sulphonic acid.</p> Signup and view all the answers

<p>Polyether rubbers have a dimensional accuracy shrinkage of 0.2%.</p> Signup and view all the answers

<p>All types require the use of adhesive and should be applied at an equal length of the two pastes, 2-3mm in thickness inside the tray.</p> Signup and view all the answers

<p>Silicone rubber has the highest tear strength.</p> Signup and view all the answers

<p>Polyether rubbers have a pleasant taste.</p> Signup and view all the answers

<p>Silicone rubbers are compatible but require a surfactant to improve wetability, while polyether is inherently compatible and does not need it.</p> Signup and view all the answers

<p>All types should be cast within one hour to prevent dimensional instability that can occur over time.</p> Signup and view all the answers